Pump Parameters Research Articles

Visual experimental study on cavitation performance of double-suction centrifugal pump

In this paper, the cavitation test results of double-suction centrifugal pump are further “visualized” and verified by using high-speed photography technology to photograph the development process and flow field of impeller inlet cavitation. By optimizing the impeller inlet parameters, the key geometric factors affecting the cavitation performance of the double suction pump were determined. The experimental results show that by optimizing the inlet parameters of the double-suction pump and combining the visualization test verification of cavitation, on the basis of ensuring the wide and efficient efficiency of the double-suction centrifugal pump, the optimization scheme of the experimental design greatly improves its cavitation performance, and provides a new design idea and reference for guiding the development and design of products with high cavitation performance.

Control of the Dynamic Regimes of a Superconducting Nanointerferometer

An analytical solution has been found to describe dynamic processes in a superconducting nanointerferometer with negligibly low inductances that is included in a high-Q factor resonator. The effect of nonlinearity in the system, as well as the effect of external parametric pumping, has been analyzed. The screening of detected dynamic modes in the studied nanostructure in the resonator is performed in a wide range and their positions on the plane of the parameters have been determined. A significant influence of phase effects on the evolution of the system has been demonstrated and phase relations allowing one to control the output signal intensity have been evaluated. The detected effects open new possibilities for developing and testing basic elements of modern quantum computing systems.

An intelligent decision support system for groundwater supply management and electromechanical infrastructure controls

This study presents an intelligent Decision Support System (DSS) aimed at bridging the theoretical-practical gap in groundwater management. The ongoing demand for sophisticated systems capable of interpreting extensive data to inform sustainable groundwater decision-making underscores the critical nature of this research. To meet this challenge, telemetry data from six randomly selected wells were used to establish a comprehensive database of groundwater pumping parameters, including flow rate, pressure, and current intensity. Statistical analysis of these parameters led to the determination of threshold values for critical factors such as water pressure and electrical current. Additionally, a soft sensor was developed using a Random Forest (RF) machine learning algorithm, enabling real-time forecasting of key variables. This was achieved by continuously comparing live telemetry data to pump design specifications and results from regular field testing. The proposed machine learning model ensures robust empirical monitoring of well and pump health. Furthermore, expert operational knowledge from water management professionals, gathered through a Classical Delphi (CD) technique, was seamlessly integrated. This collective expertise culminated in a data-driven framework for sustainable groundwater facilities monitoring. In conclusion, this innovative DSS not only addresses the theory-application gap but also leverages the power of data analytics and expert knowledge to provide high-precision online insights, thereby optimizing groundwater management practices.

Characterizing two-mode-squeezed light from four-wave mixing in rubidium vapor for quantum sensing and information processing.

We present a study of homodyne measurements of two-mode, vacuum-seeded, quadrature-squeezed light generated by four-wave mixing in warm rubidium vapor. Our results reveal that the vacuum squeezing can extend down to measurement frequencies of less than 1 Hz, and the squeezing bandwidth, similar to the seeded intensity-difference squeezing measured in this system, reaches up to approximately 20 MHz for typical pump parameters. By dividing the squeezing bandwidth into smaller frequency bins, we show that different sideband frequencies represent independent sources of two-mode squeezing. These properties are useful for quantum sensing and quantum information processing applications. We also investigate the impact of group velocity delays on the correlations in the system, which allows us to optimize the useful spectrum.

Организация подачи (транспортировки) огнетушащих веществ на тушение пожаров способом перекачки

Purpose. For the first time ever the article comprehensively considers issues related to water supply (transportation) to the seat of extinguishing large scale fires over long distances. The authors pay special attention to the conditions determining the choice of pumping as a way of supplying water over long distances. Recommendations are given on the choice of water pumping method and its practical implementation at the fire scene. The calculation method of pump and hose systems implemented during pumping and the express method for determining pumping parameters for practical workers are presented. Methods. Based on extinguishing large scale fires data analysis, topical issues on extinguishing agents supply (transportation) by pumping method were identified, analytical calculations of pump-hose systems parameters implemented when pumping water to the seat of extinguishing large scale fires were made, taking into account tactical and technical characteristics of modern fire trucks. Findings. The proposed method (algorithm) allows converting analytical calculations into accurate calculation system (express method) using a spreadsheet or nomograph. For the first time ever the express calculation table shows the dependence of pumping parameters on the distance between the water source and fire source and the water flow rates supplied by fire pressure hoses. This table allows determining the need of water pumping supply to the fire scene and determining the number of pumping stages; number of fire pressure hoses for pumping; pressure on water tenders fire pumps operating in pumping. Express method provides calculation of water pumping parameters from pump to pump via one or two main hose lines. Research application field. Based on this study, the team of authors developed “Recommendations for applying fire departments tactical capabilities at extinguishing fires and conducting emergency rescue operations.” Conclusions. . Knowledge and application of conditions determining the choice of pumping as a method of supplying (transportation) water over long distances, recommendations for choosing a pumping water method, as well as the methodology for calculating hose systems parameters, the number of main fire trucks for supplying fire extinguishing agents to the fire scene by pumping will increase the level of tactical training of the fire chief. The proposed express method for determining the pumping parameters according to the nomograph allows the fire chief and other officials to reduce the time for making managerial decisions and organizing the supply (transportation) of water for fire extinguishment, as well as reduce the area of extinguishing fires and reduce economic and material damage from them.

Archimedes Screw Pump Efficiency Based on Three Design Parameters using Computational Fluid Dynamics Software – Ansys CFX

Utilization of Archimedes screw pumps as water lifting pumps has become widespread in past decade due to frequent occurrences of floods in Malaysia. The problem of insufficient drainage in various urban areas exacerbates the impact of heavy rainfall, prompting efforts to mitigate this issue with minimal maintenance cost and low impact to the environment. Thus, this study is aiming to study the design parameters of screw pump to obtain the optimal efficiency of the Archimedes screw pump specifically for flood mitigation in Malaysia. The main design parameters affecting pump’s efficiency are rotor profile, pitch length, length of the pump, rotational speed, inclination angle, and material selection. However, only three design parameters were considered in the study, that are the angle of inclination, the number of blades, and the angular velocity of the rotating pump. These three design parameters are selected as many previous findings focusing on varying angle of inclination with number of blades with constant rotational speed. Thus, this study will find the highest efficiency when these three design parameters are integrated with variation of rotational speeds at 25, 30 and 40 RPM. Basically, screw pump is designed using SOLIDWORKS and simulations with specific boundary conditions are conducted using the ANSYS-CFX software, which utilizes computational fluid dynamics (CFD) techniques. These boundary conditions are based on previous study by Rosly et al in 2016. The inlet flow rate of 0.002 m3/s and diameter of the screw pump are constant while the other three main parameters are varying within the acceptable ranges which are reported from prior studies. The outcomes found that the highest torque is generated by a single rotating blade at 5.65 Nm which rotates at 30 RPM at 30° angle of inclination. Meanwhile, the highest efficiency of 24.04% is obtained with a single rotating blade at 40 RPM with 20° angle of inclination. Based on the findings, it is concluded that these three main design parameters of screw pump may not be sufficient to obtain the optimal efficiency for the specific boundary conditions used in the simulation study. Thus, several combinations of design parameters should be considered in the future to increase the screw pump’s efficiency.

Этапы технического совершенствования центробежных насосов шахтного водоотлива

The article shows the timeliness of an in-depth analysis of changes in the main hydrodynamic parameters of centrifugal pumps for the main drainage of mines, depending on their depth and time history, as well as for processing plants of various technological processes. The requirements for the characteristics of drainage pumping equipment, determined by modern needs for mining in the conditions of technical and economic possibilities for mining, taking into account the geological features of the most accessible deposits explored and accepted for development are determined up by the authors. The aim of the research is to correlate dependencies of the operated centrifugal sectional pumps characteristics with the depths of mines, determined by the needs of mining operations for the extraction of minerals using the underground method. Research objectives are as follows: to establish the main historical stages of the technical development levels of centrifugal pumps for mine drainage and their relationship with the actual depths of mining operations; to propose design solutions to increase energy efficiency and hydrodynamic loading of centrifugal pumps using vortex methods to control the flow of flow into the pump impeller. As a result three main stages of technical improvement of centrifugal pumps for mine drainage over the past 80 years have been established. The criteria for assessing the level of technical excellence of centrifugal pumps for mine drainage in this study are their efficiency, which characterizes the energy efficiency and cost-effectiveness of the equipment, and the pressure coefficient, as an indicator for assessing the level of hydrodynamic loading of the impeller of a centrifugal pump. It has been established that there is a correlation between the pressure and efficiency coefficients depending on the depths of the mines of the corresponding historical period of time. Theoretical dependencies are constructed and the prospects for changes in the pressure coefficient and the effective action of centrifugal pumps in the next decade are shown to ensure their high energy efficiency given the current dynamics of development of mine construction. Correlation dependences between the efficiency coefficient, efficiency of centrifugal sectional pumps and the required height of mine drainage water lifting have been obtained. From the impeller designs analysis of the considered centrifugal sectional pumps, developed according to the theory of L. Euler, it follows that further increase of the stage head coefficient by classical methods has reached its limit and its further increase is possible only through the improvement of hydrodynamic processes with the use of vortex methods of flow control in the flow-hydraulic part of the pump. With the help of correlation equations the predicted values of head coefficients and efficiency are presented based on the analysis of required parameters of centrifugal sectional pumps determined by the dynamics of mine construction development.

Phase and frequency-resolved microscopy of operating spin Hall nano-oscillator arrays.

Coherent optical detection is a powerful technique for characterizing a wide range of physical excitations. Here, we use two optical approaches (fundamental and parametric pumping) to microscopically characterize the high-frequency auto-oscillations of single and multiple nano-constriction spin Hall nano-oscillators (SHNOs). To validate the technique and demonstrate its robustness, we study SHNOs made from two different material stacks, NiFe/Pt and W/CoFeB/MgO, and investigate the influence of both the RF injection power and the laser power on the measurements, comparing the optical results to conventional electrical measurements. To demonstrate the key features of direct, non-invasive, submicron, spatial, and phase-resolved characterization of the SHNO magnetodynamics, we map out the auto-oscillation magnitude and phase of two phase-binarized SHNOs used in Ising machines. This proof-of-concept platform establishes a strong foundation for further extensions, contributing to the ongoing development of crucial characterization techniques for emerging computing technologies based on spintronics devices.

Modeling of dynamic modes of a generalized pumping station with an asynchronous electric drive of centrifugal pumps

Transportation of large volumes of liquid to distribution pipelines is provided by transit facilities - main pipelines and pumping stations, which consume significant amounts of electricity and are of strategic importance. The requirements for continuity, reliability, safety, fault finding, and diagnosis of existing, as well as requirements for the design of new strategic objects, are usually regulated by national legislation. The possibility of conducting physical experiments to analyze the modes of operation of such complexes is significantly limited by the inadmissibility of interrupting their functioning, as well as technical and financial risks. The use of a hybrid model consisting of a digital model of the power equipment and a physical model of the control system makes it possible to solve this problem. In this work, attention is focused on the digital model of power equipment. Based on the system approach and the principle of electrohydrodynamic analogy, a formalized mathematical model of the generalized system of asynchronous centrifugal pump units of a multi-unit pumping station with asynchronous electric drive of centrifugal pumps was created. The use of the principle of electrohydraulic analogy made it possible to apply the basic principles of the theory of electric circuits to form the equations of the hydraulic subsystem. The achieved formalization makes it possible to automate the formation of equations to obtain a model of an object of a specific configuration. The use of pump parameters in the model, which depend on the geometry of the internal elements, the speed of the impeller, and the physical properties of the liquid, makes it possible to investigate the impact of emergency and operational deviations of the equipment characteristics on the operating modes both at the level of individual modules and at the level of the pumping station as a whole. The obtained mathematical model was verified by adapting it to the pumping station of the given configuration. A computer simulation of several operational and emergency modes of operation of a pumping station with four hydraulically connected pumps was carried out. The scope of use and ways of improving the developed model are proposed, as well as the direction of further research

ЖИДКОСТНОКОЛЬЦЕВЫЕ ВАКУУМНЫЕ НАСОСЫ КОМБИНИРОВАННОГО ТИПА ДЛЯ ЭНЕРГОЭФФЕКТИВНЫХ ТЕХНОЛОГИЧЕСКИХ ПРОЦЕССОВ ПЕРЕРАБОТКИ РАСТИТЕЛЬНОГО СЫРЬЯ

The use of one- and two-stage liquid ring vacuum pumps of a combined type for agricultural processes is justified: drying, extraction, vacuum evaporation and transportation of plant materials. The purpose of the article is formulated, which is to develop a method of theoretical calculation for the selection of liquid ring vacuum pumps of a combined type for the presented agricultural processes. Scientists who have been and are currently continuing research on this problem are presented. The general methodology for calculating the speed of action, adjusted for the flow rate and geometric parameters of a liquid ring vacuum pump (LVN), is described. The technological scheme of the processes of two-stage convective-vacuum-pulse drying (DCVID) and extraction is described and the use of a two-stage liquid-vitrochemical drying agent for them is justified. A method for calculating the speed of action based on the technological parameters of the devices used is presented. A method for determining the speed of action for DKVIS and extraction in the case of using pulsed action on the processed plant material is also described. The rationality of creating pulses during DCVIS in an additional container or one housing (when using a multi-body apparatus) is substantiated. A technological scheme of the process of vacuum transportation of dry bulk plant material is described. It is proposed to use a single-stage liquid liquid pump for this process. A method for selecting a vacuum pump based on the required performance and air flow is described. Based on the presented materials, conclusions and conclusions are drawn.

PERFORMANCE OF HEAT PUMP BASED ON COMPOSITE ADSORBENT ‘SILICA GEL – CRYSTALLINE HYDRATE’

Performance of an adsorptive heat pump has been studied. The factors affecting the efficiency of its work have been analyzed. Operating parameters and efficiency of adsorptive heat pumps and adsorptive heat storage devices have been compared. An algorithm of calculating the basic operating characteristics of an adsorption heat pump in heat supply systems has been proposed. It involves calculating the mass transfer coefficient, final absolute humidity of the air flow passed though adsorbent layer, the water uptake or adsorption and the useful heat of adsorption and heat of condensation, determination of heat inputs for the operation of the device such as heating the adsorbent, case of the device, hydraulic circuit, the water in the tank and adsorbed water, heat of desorption and heat of evaporation, estimation the coefficient of energy performance. The evaluation criteria of the efficiency of adsorptive heat pumps and heat storage devices have been compared. It is shown that the operating parameters of the adsorptive heat pump and the adsorptive thermal energy storage device based on composite adsorbents ‘silica gel – sodium sulfate’ and ‘silica gel – sodium acetate’ are the same, i.e. airflow rate 0.08 - 0.1 m3/s and initial absolute humidity of airflow 0.03 – 0.04 kg/m3, which are corresponded with maximal efficiency of the device. The temperature of the humid air flow directed to the adsorbent layer is suggested to be set at 20 – 40 °C. The measures to increase the efficiency of the adsorptive heat pump are proposed. It is shown that ultrasonic air humidification allows to increase the coefficient of energy performance by almost 2 times compared to steam humidification. The obtained results can be used for developing energy-efficient heating systems of residential premises.

Superconducting pump manipulated by non-topologically quasi and topological interface states

We propose an adiabatic superconducting charge pump based on massive Dirac electrons. A superconductor is sandwiched in between two pumping sources, which are formed by introducing the time-dependent and out-of-phase staggered potentials in graphene as pumping parameters. The pump is shown to be characterized by not only the topological interface state (TIS) but also the non-topologically quasi interface state (QIS). Hereafter, our attention is focused on the pumping currents ILNR and ILAR from the normal and Andreev reflections, respectively, which predominate by making the electron energy reside in the effective energy gap. It is found that modulating the energy E, superconductor length L 0, and pumping source length LP results in the considerable variation of competitive behaviors between ILNR and ILAR . In particular, the reversal effect of current direction can be realized by tuning LP . More interestingly, the current-phase relationship exhibits the platform behaviors, which can be manipulated by LP and the pumping strength. All the above pumping properties are attributed to the adiabatic evolution of TIS and non-topologically QIS, particularly the conversion between each other is the crucial origin. We also obtain the quantized pumping current by adjusting LP and L 0, and present the corresponding qualitative explanation through the pumping contour circled by the two parameters. In addition, we discuss the features of pumping current based on the armchair graphene as well.

Quantum Otto-type heat engine with fixed frequency.

In this work we analyze an Otto-type cycle operating with a working substance composed of a quantum harmonic oscillator (QHO). Unlike other studies in which the work extraction is done by varying the frequency of the QHO and letting it thermalize with a squeezed reservoir, here we submit the QHO to a parametric pumping controlled by the squeezing parameter and let it thermalize with a thermal reservoir. We then investigate the role of the squeezing parameter in our Otto-type engine powered by parametric pumping and show that it is possible to reach the Carnot limit by arbitrarily increasing the squeezing parameter. Notably, for certain squeezing parameters r, e.g., r=0.4, the quasistatic Otto limit can be reached even at nonzero power. We also investigated the role of entropy production in the efficiency behavior during the unitary strokes, showing that positive (negative) changes in entropy production correspond to increases (decreases) in engine efficiency, as expected. Furthermore, we show that under thermal reservoirs a work extraction process that is more efficient than the Carnot engine is impossible, regardless of the quantum resource introduced via the Hamiltonian of the system.

Design of Performance Testing Bench System for High-Pressure Gear Pump in Automobile Suspension System

In order to test the relevant performance parameters of the high-pressure gear pump used in automobile suspension systems, a performance testing bench system for high-pressure gear pump was designed. Taking into full consideration the principles of hydraulic system design, the performance parameters of the pump to be tested, and the functions required by the system, the hydraulic circuit design, hardware design, and software design of the system were carried out. Finally, the entire system was subjected to experimental testing, validating its reliability and confirming its compliance with performance requirements.

Modulation instability in a microresonator with graphene saturable absorber, frequency selective feedback and external potential

Modulation Instability is studied in the presence of an external periodic potential in microresonator comprising of a vertical cavity surface emitting laser with saturable absorber and frequency selective feedback. The role of intensity of input field, pump parameter, diffraction coefficient and saturable absorption on the modulation instability has been investigated. Thus, Modulation instability can be tuned by varying the system parameters. This aspect would be beneficial for the purpose of encryption. It is also observed that modulation instability is not explicitly dependent on externally applied potential whereas the effect of potential is shown implicitly by using numerical analysis. The presence of an external potential give the operating range of resonance frequency of the optical cavity instead of one value at the same system parameters. This operating range of resonance frequency is spatially dependent and varies with the system parameters.

ANALYSIS OF THE INFLUENCE OF THE DESIGN PARAMETERS OF THE UPPER STAGE LIQUID PROPELLANT ROCKET ENGINE PUMP ON ITS CAVITATION CHARACTERISTICS

Abstract. The phenomenon of cavitation is inherent in all vane machines, the working medium of which is liquid. With a certain combination of input pressure, flow rate, rotor speed, and the gas saturation of the working fluid in the vane machine, cavitation may occur. Cavitation negatively affects the power characteristics of the vane machines. It leads to a drop in the power parameters for the pumps and damage to their flowing parts. And also at times increases the pulsation of pressure at the pump outlet and vibration. This is especially dangerous for LPRE chambers, as the pulsation of pressure leads to the appearance of low-frequency oscillations of the chamber itself. Therefore, it is so important, even at the design stage, to determine the cavitation perfection of the LPRE vane pump and take measures to increase it.When developing the RD861K engine, high demands were placed on the power perfection of the oxidizer pump. The efficiency of the oxidizer pump RD861K should be 5% higher than that of the oxidizer pump RD861 (pump prototype).To increase the efficiency of the oxidizer pump of the RD861K engine, a number of design parameters was changed (compared to the prototype). These works were crowned with success, the required efficiency value was achieved. However, some of the taken measures had a negative impact on the cavitation perfection of the pump.This study is devoted to the analysis of the influence of the design parameters of the RD861K engine pump (which make it possible to increase its efficiency) on its cavitation properties. During the analysis, it was determined how the design parameters affect the nature of the cavitation characteristicof the oxidizer pump RD861K and RD861. It is also established how a concrete design change affects the value of the suction specific speedof the pump. In addition to the above studies, an analysis was made of cavitation characteristics of pumps operating on a gas-containing two-phase liquid. Based on the results of the analysis, the dependence of the decrease in therelativesuction specific speedof the pump on the amount of gas supplied to the inlet to the pump was constructed. The results of this study allow us to estimate the magnitude of cavitation pump failure at the design stage, depending on the design features of its flowing part when working liquid withoutgas and on the gas-liquid two-phase mixture.

Energy efficiency of “hot” oil pipelines under partial load conditions

The article discusses trenchless methods of pipeline repair, which can be used in the repair of oil pipelines in conditions of incomplete loading. Trenchless pipeline reconstruction technologies are widely used due to certain advantages that ensure environmental safety and economic efficiency. Such technologies can be used in conditions where it is impossible to use open methods of repair, with minimal volumes of earthworks, without damage to existing underground communications, as well as when working in unstable soil conditions. The main attention is paid to the repair according to the “pipe in a pipe without destruction” scheme. The article is devoted to solving the optimization problem of choosing the diameter and wall thickness of the internal pipeline, which runs in the repaired one, according to the criteria of minimal heat loss at maximum throughput, in which energy costs for transporting the product will be minimal, which will allow obtaining maximum energy efficiency. The authors use analytical methods and conduct a study of the influence of changes in pipeline characteristics on product pumping parameters. The results of the study show that the methods of trenchless repair of “hot” oil pipelines are effective from an economic and energy point of view. The work established that during the repair of long “hot” oil pipelines with intermediate heating points, the selection of the diameter of the internal pipeline requires taking into account the energy consumption at these intermediate heating points. The work contains an algorithm for choosing the optimal diameter and wall thickness of the pipeline, which can be useful for oil transportation enterprises and energy companies to optimize work and reduce energy costs for transporting the product

Abstract 15264: Impact of 2018 Change in UNOS Heart Transplant Policy on Wait List Outcomes

Introduction: In October 2018, the updated Heart transplant (HT) policy by United network of Organ Sharing (UNOS) gave priority to critically ill heart failure patients. It has made significant improvement in long term survival of ECMO bridged HT recipients. However, there are limited reports on wait list mortality following change in this policy. Hypothesis: Review of waitlist mortality following 2018 change in guideline Methods: This is a retrospective cohort study including all adult heart failure patients listed for HT alone between 2015 and 2022 in the UNOS data. Cohort was stratified on the basis of year of listing, those who listed between 2015 & 2018 and those who listed between 2019 & 2022. The categorical and continuous variables were compared using chi2 and Kruskal Wallis test, respectively. Time to death analysis between both the group was evaluated using Kaplan Meier curve and log rank test. Results: Total 33,908 patients were included, of them 16,281 were listed between 2015 & 2018 and remaining 17,627 were listed between 2019 & 2022. The rate of HT did not change between both the time period (10,660 (65.5%) & 11,660 (66.1%), p=0.19)), respectively. There was no difference in age, gender and BMI between both the groups. The use of Intra-aortic balloon pump, ventilator, Inotropes and other parameters indicating severity of illness were frequently noted among patients listed between 2019 & 2022. The overall wait list mortality has reduced from 1250/16,281(7.7%) to 764/17,627 (4.0%) during later time period, p<0.001 (Figure 1). Similarly, patients’ dropouts due to illness severity has reduced from 1321/16821 (8.1%) to 764/17,627 (4.3%), p<0.001, respectively. There is significant reduction in disease etiology specific mortality following 2018 change. Conclusions: The change in HT policy in 2018 has significantly reduced the wait list mortality and dropouts during study periods. In addition, sicker patients were listed for transplant following 2018 change.

Study of the Relationships among the Reverse Torque, Vibration, and Input Parameters of Mud Pumps in Riserless Mud Recovery Drilling

Compared with traditional deepwater drilling, riserless mud recovery (RMR) drilling technology has the advantages of improving drilling efficiency, reducing risks, and minimizing environmental effects. Therefore, RMR drilling technology has been widely applied in recent years. This study primarily investigates the relationships among reverse torque, vibration, and input parameters of mud pumps in riserless mud recovery drilling. Firstly, the operating principle and the structure of the mud pump module are analyzed, and an analytical model for the reverse torque and the vibration of the mud pump is established. Secondly, relevant data are derived from theoretical calculations and experiments, and the relationships among the reverse torque, vibration, and input parameters of the mud pump are analyzed using ANSYS (Version 2020 R1) software. Furthermore, the SVR (support vector regression) algorithm is employed to predict and analyze the amplitude of the mud pump’s vibration. Finally, the conclusions are drawn based on the findings of the relationships among the reverse torque, vibration, and input parameters of the mud pump. The findings show that the reverse torque of the mud pump increases approximately linearly with an increase in rotational speed, and the vibration of the mud pump increases and then decreases with an increase in rotational speed. The predicted values obtained through the prediction algorithm closely match the actual values. The findings provide a valuable reference for the application of RMR technology.

Optimal Design of Motor–Pump Parameters for Direct Load-Sensitive EHA Based on Multi-Objective Optimization Algorithm

The electro-hydrostatic actuator (EHA) is a highly integrated and reliable actuation system which has been widely used in aerospace and construction machinery. In addition, the direct load sensitive EHA (DLS–EHA) has been investigated by introducing load-sensitive techniques which can well match the system output and external loads. More importantly, the matching design of motor–pump parameters is an important stage in the pre-design phase of DLS–EHA. For this reason, a multi-objective optimization design method for DLS–EHA motor–pump parameters is proposed in this paper. Firstly, the motor–pump mass and energy loss models are constructed based on similarity criteria. Secondly, the multi-objective particle swarm optimization algorithm (MOPSO) is used to optimize the design of the motor-pump parameters, and the Pareto frontier solutions of the optimized parameters are obtained. Further, the optimal design parameters are selected on the basis of meeting the actual requirements. Finally, the DLS–EHA prototype is designed based on the optimized design parameters and experimental verification is completed. The results of the study show that the optimized design parameters can meet the design requirements. The design method proposed in this paper provides an important theoretical basis for the optimized design of DLS–EHA.