Pump Outlet Pressure Research Articles

Optimization of a novel liquid carbon dioxide energy storage system by thermodynamic analysis and use of solar energy and liquefied natural gas

Liquid carbon dioxide energy storage with its advantages in terms of geographical constraints and economic performance has garnered significant attention. In this study, a novel liquid carbon dioxide storage system was proposed which utilizes the waste cold energy from LNG and achieves high liquefaction efficiency. By integrating solar energy, net output of the system is increased. The results show that the net output is sensitive to turbine 1 outlet pressure. Round-trip efficiency and energy storage density increases with the rise of the pump outlet pressure first and subsequently exhibits a gradual decline with an inflection point. With the increase in ambient temperature, the system efficiency shows a slight decrease, yet energy storage density shows a significant increase. At basic operating conditions, the system demonstrates energy storage efficiency of 66.64 %, round-trip efficiency of 74.33 %, and energy storage density of 23.51 kWh/m3. In addition, optimization was conducted. Single-objective optimization results show that round-trip efficiency, energy storage density and levelized cost of storage can reach 89.86 %, 25.37 kWh/m3 and 0.1873 $/kWh, respectively. Multi-objective optimization obtained compromise results of round-trip efficiency and levelized cost of storage of 85.33 % and 0.1947 $/kWh when integrated solar energy, showing a 33.77 % increase and a 13.20 % decrease compared to 63.79 % and 0.2243 $/kWh when not integrated solar energy.

Flow characteristics and factors affecting flow pulsation of external meshing herringbone gear pump

To enhance the outlet flow stability of the external herringbone gear pump, an analysis was conducted on the main influencing factors, key geometric parameters were identified, and a numerical model was developed for fluid analysis. A numerical model was then established for fluid analysis. The accuracy of the numerical model was verified by comparing it with experimental results, with simulation errors of displacement and volumetric efficiency being < 5%, ensuring the simulation's accuracy. The simulation results indicated that the pump's head (49.7808 m) and outlet pressure (4.9285 bar) remained stable. At 700 rev/min, the simulated volumetric efficiency was 82.94%. Subsequently, the impact of helix angle, changes in center distance, and tip clearance on outlet flow stability were analyzed. The analysis revealed that increasing the helix angle from 27° to 30° could reduce flow pulsation. A slight reduction in center distance from 180.3 (δ = +0.3 mm) to 179.9 mm (δ = −0.1 mm) effectively decreased mass flow difference and outlet pressure pulsation, enhancing outlet output stability. Reducing tip clearance from 0.25 to 0.12 mm, while meeting design requirements, resulted in more stable pressure and lift output. These results ensured smooth pump operation, improved outlet output stability, and met low-flow pulsation requirements. This study offered valuable insights into the design and production of the external meshing herringbone gear pump.

Static Characteristics and Energy Consumption of the Pressure-Compensated Pump

The motivation of this research was to assess the possibility of speed control for the selected pressure-compensated pump. Measured static characteristics of an axial piston pump with pressure compensation are presented in the paper. Based on these characteristics, the pump efficiencies are determined. The characteristics and efficiencies are determined for the different pump outlet pressures, pump speeds, relative displacements and for the different pressures set at the pressure compensator. In addition, the different methods of pump control were compared. These are displacement control, speed control and both controls. The efficiency of each control method was compared based on the determined mechanical input power at the pump drive shaft. By comparing these control methods, it was found that the combination of both control methods can achieve up to 93% savings of mechanical power in the controlled state (stand-by state). Also, the adverse effects resulting from each control method that reduces pump efficiency were defined.

Experimental and numerical investigation of the stenosed coronary artery taken from the clinical setting and modeled in terms of hemodynamics.

The study was carried out to investigate the effect of the artery with different pulse values and stenosis rates on the pressure drop, the peristaltic pump outlet pressure, fractional flow reserve (FFR) and most importantly the amount of power consumed by the peristaltic pump. For this purpose, images taken from the clinical environment were produced as models (10 mm inlet diameter) with 0% and 70% percent areal stenosis rates (PSR) on a three-dimensional (3D) printer. In the experimental system, pure water was used as the fluid at 54, 84, 114, 132, and 168 bpm pulse values. In addition, computational fluid dynamics (CFD) analyzes of the test region were performed using experimental boundary conditions with the help of ANSYS-Fluent software. The findings showed that as PSR increases in the arteries, the pressure drop in the stenosis region increases and this amount increases dramatically with increasing effort. An increase of approximately 40% was observed in the pump outlet pressure value from 54 bpm to 168 bpm in the PSR 0% model and 51% increase in the PSR 70% model. It has been observed that the pump does more work to overcome the increased pressure difference due to increased pulse rate and PSR. With the effect of contraction, the power consumption of the pump increased from 9.2% for 54 bpm to 13.8% for 168 bpm. In both models, the Wall Shear Stress (WSS) increased significantly. WSS increased abruptly in the stenosis and arcuate regions, while sudden decreases were observed in the flow separation region.

An idea to construct integrated energy systems of data center by combining CO2 heat pump and compressed CO2 energy storage

Aiming at the characteristics of high power consumption and abundant waste heat resources in data centers, the integrated energy systems of data center are constructed by combining CO2 heat pump and compressed CO2 energy storage. Considering different stages of compression and expansion in energy storage, System I and System II are proposed. The systems can continuously provide cooling to data center through the CO2 heat pump, and can also store the low-cost electricity so as to supply power to data center during the peak electricity consumption period. Meanwhile, hot water can also be provided by fully extracting the residual heat from the systems. Furthermore, to investigate system performances, the thermal and economic models are developed. On this basis, the thermal and economic performances for the two systems are analyzed in detail under design conditions. The results indicate that when providing cooling capacity of 5000 kW for data center, the Coefficient of Performance (COP) of heat pump is 7.22, and Round-Trip Efficiency (RTE) of System I and System II are 56.94 % and 55.85 % respectively. Systems I and System II can provide 879.26 tons and 1158.73 tons of domestic hot water, respectively. The total system capital cost is 234.35 × 104$ for System I, and 344.45 × 104$ for System II. Accordingly, the payback periods are 12.71 years and 11.19 years respectively. Furthermore, the effects of pressures on the system performances are also analyzed. The results show that every 0.5 MPa increase for heat pump outlet pressure, RTE of System II increases by 0.6 %, but the effect on System I is not significant.

A heat source self-supplied thermodynamic system using liquefied natural gas: Performance evaluation and three-objective optimization

In recent years, growing concerns have arisen due to the tight energy supply and escalating demand have driven the research on energy-efficient polygeneration systems. Liquefied natural gas (LNG) is highly regarded as a clean fossil fuel, capable of both cooling and serving as a heat source. This makes it a favored choice for thermodynamic system design. LNG gasification at −162 °C under standard pressure releases substantial cold energy. To avoid its waste, a novel self-supplying thermodynamic system was devised to recover this energy, incorporating a specific cold storage module that combines power generation and heating systems. This approach offers insights into creating polygeneration systems using LNG as the sole energy source. In light of the intricate energy exchanges within the system, based on the energy parameters of each stream, a comprehensive evaluation of its engineering feasibility is conducted through the analysis of energy, exergy, exergoeconomic, and exergoenvironmental parameters. Additionally, key parameters like R1150 mass flow rate, pump 3 outlet pressure, compressor 2 outlet pressure, LNG pump outlet pressure, and R23 liquefaction temperature are examined. Finally, the non-dominated sorting genetic algorithm II (NSGA-II), particle swarm optimization (PSO) and the multi-objective artificial hummingbird algorithm (MOAHA) rooted in hummingbird foraging behavior, are applied to optimize the proposed system. The results show that the energy utilization efficiency, exergy efficiency, product unit exergoeconomic cost, and product unit exergoenvironmental impact are 72.08%, 45.45%, 98.04 $/GJ, and 1.478 × 10−2 mpt/kJ, respectively. These excellent performance indicators demonstrate that the system is developable in the field of LNG utilization, filling a gap in the joint research of cold storage, power generation and heating for LNG cold energy utilization. Enhancing system performance can be achieved by increasing the mass flow rate of R1150 and the output pressure of compressor 2, reducing the output pressure of pump 3 and the liquefaction temperature of R23. When increasing the output pressure of LNG pump, can only increase exergy efficiency, while the energy utilization efficiency, product unit exergoeconomic cost and product unit exergoenvironmental impact all go down. Compared with the initial condition, after the application of MOAHA optimization, the exergy efficiency increased by 2.8%, the product unit exergoeconomic cost decreased by 3.47 $/GJ and the product unit exergoenvironmental impact decreased by 0.047 × 10−2 mpt/kJ. These results outperform those of NSGA-II and PSO, indicating that MOAHA can lead to superior system performance by overcoming multi-objective conflicts. This study provides valuable insights for designing and optimizing LNG cold energy utilization systems in situations without nearby heat sources or when power generation, heating, and cold storage are required.

Study on mechanical efficiency of 65 ml/r fuel pump and its piston optimization

The 65 ml/r fuel pump proposed in this paper is a new type of large-displacement piston pump. The pump is of the roller plunger type construction. This structure enables the pump to have good performance even under high and variable speed conditions. Firstly, force analysis of this pump and establishment of mathematical model of pump mechanical efficiency. The influence of load pressure and speed on mechanical efficiency was obtained by numerical simulation through matlab. Then the prototype was designed and manufactured. The pump outlet pressure, outlet flow rate, and torque were measured on the test bench under various load pressure and speed, and mechanical efficiency of pump at various load pressure and speed was got. The experimental data and simulation are close. 65 ml/r fuel pump has a volumetric efficiency of 99% and a mechanical efficiency of 58.6% at a load pressure of 3 MPa and a speed of 1500 rpm. From experimental results, 65 ml/r fuel pump volumetric efficiency is high, but there is a problem of low mechanical efficiency. The piston of pump will be optimized for improved mechanical efficiency of pump. Then mechanical efficiency of the optimized pump is calculated and compared with mechanical efficiency before optimization. Results show that piston optimization will increase mechanical efficiency of pump.

Steady-state interconnected cycle modeling and experimental results of a lab-scale ORC

ORC is one of the mature technologies for power generation from low temperature heat sources. In this study, the aim is to develop an accurate ORC model which is validated using reliable steady-state data. For this purpose, tests are carried out at four different heat source temperatures ranging from 80 to 110 °C to obtain data in a repeatable manner. The proposed model considers pressure drop and heat transfer correlations to improve the accuracy of model predictions. Using the refrigerant pump mass flow rate, thermal oil pump volumetric flow rate, cooling water inlet temperature, cooling water volumetric flow rate, the throttle valve outlet set pressure, and refrigerant pump outlet pressure as input, the model predicts the pressure, temperature, and mass flow rate in the cycle. The results show that the steady-state ORC model is significantly accurate, with ±1% deviations in pressure and ±1 °C in temperature, and ±5% in mass flow rate, heat transfer rate and refrigerant pump power predictions. The novel iterative model presented in this study includes pipe losses and significantly improves the simulation accuracy of ORCs with long pipes.

Experimental investigation and machine learning optimization of a small-scale organic Rankine cycle

The system behaviors of a small-scale organic Rankine cycle (ORC) system using a scroll expander under various operating conditions, as well as the machine learning optimization based on back propagation artificial neural network (BPANN), are investigated in this study. The effects of pump outlet pressure, expander inlet temperature and mass flow rate on net power output and thermal efficiency are examined experimentally. A BP-ORC neural network model is constructed, and the prediction accuracy is analyzed by the errors between the experiment and predicted data. The effects of eight operating parameters on system performance are discussed. The bi-objective optimization for maximum net output power and maximum thermal efficiency is addressed. Results indicate that as the mass flow rate increases, the net power output presents an increase trend, whereas the thermal efficiency yields a smooth tendency. The absolute error in the net power output from the BP-ORC model is between −0.05 kW and 0.05 kW, while that in the thermal efficiency is between −8 × 10-5 and 8 × 10-5. The Pareto-optimal solution of thermal efficiency is 9.32 % and the net output power is 2.42 kW.

Investigation of pressure pulsation induced by quasi-steady cavitation in a centrifugal pump

To study the pressure pulsations induced by quasi-steady cavitation in a centrifugal pump, the pressure pulsations at the pump inlet and outlet were experimentally investigated with the development of cavitation. Moreover, the internal flow characteristics in the pump during the process were numerically determined. The numerical simulation results agreed well with the results obtained from the experimental test, verifying the accuracy of the numerical simulation. Furthermore, the cavitation-induced pump inlet and outlet pressure pulsations of the centrifugal pump were analyzed by wavelet analysis and fast Fourier transform, and the cavitation incipient point and occurrence of the unstable cavitation point were obtained. The results of both wavelet analysis and fast Fourier transform show that in the quasi-steady cavitation stage of the centrifugal pump at the design flow rate, the pump inlet and outlet pressure pulsations are significantly increased at twice the axial frequency, while the other axial frequency components are weak and the internal flow is stable. With the development of cavitation in the pump, the pump inlet and outlet pressure pulsations at the axial frequency and its multiples afford some obvious broadband pulsations. To investigate the mechanism of quasi-steady cavitation-induced pressure pulsation in the centrifugal pump, the dynamic mode decomposition was used for internal flow field analysis. The results show that different inflow states lead to obvious differences in the internal flow and unsteady flow structures. There are complex pressure pulsation characteristics dominated by different frequencies in the centrifugal pump. Blade passing frequency plays an important role in the entire flow field, and its mechanism has been analyzed. This research will provide experimental and theoretical support for quasi-steady cavitation recognition and help researchers improve the operation stability of the centrifugal pump.

Exergoeconomic, exergoenvironmental analysis and multi-objective optimization of a novel combined cooling, heating and power system for liquefied natural gas cold energy recovery

This paper designs and investigates a novel combined cooling, heating, and power (CCHP) system for effectively utilizing liquefied natural gas (LNG) cold energy and waste heat of exhaust gas based on thermodynamic, exergoeconomic and exergoenvironmental analysis. The effects of the mass flow rate of the ORC-I’s working fluid, turbine 1 inlet temperature, compressor and pump outlet pressure and the turbines’ isentropic efficiency on the system performance were investigated. In addition, the non-dominated sorting genetic algorithm II (NSGA-II) and the particle swarm optimization (PSO) were employed to optimize the CCHP system with multiple objectives, respectively, to find the optimal operating conditions of the system. The optimization results showed PSO was superior for the multi-objective optimization of this novel CCHP system compared to NSGA-II, showing the exergy efficiency, product unit cost and product unit environmental impact of 70.20%, 21.50 $/GJ and 57.91 mPts/GJ, respectively.

Study on the determination of variable characteristics of axial piston pumps

Because the variable characteristics of axial piston variable pump can be applied to different working conditions, this paper simulates the actual working conditions of axial piston pump in excavator, theoretically analyzes its variable working principle, and focuses on how to adjust the difference between pump outlet pressure and load sensitive port pressure stably. Finally, an axial piston pump variable characteristic test system is built based on LabVIEW software, and a field verification test is conducted, and an effective and reasonable test scheme is selected through analysis and comparison, which provides a certain engineering reference value for the variable characteristic test of axial piston pump.

Operation characteristics and performance prediction of a 3 kW organic Rankine cycle (ORC) with automatic control system based on machine learning methodology

Automatic control system enables the laboratory organic Rankine cycle (ORC) to adapt to variable operating conditions of industrial application. In this study, the operation characteristics of a 3 kW ORC with automatic control system applied to a chemical plant, as well as the performance prediction and optimization using machine learning methodology, are addressed. The dynamic behaviors for startup, operating and stop stages are discussed. The BP-ORC neural network model is established based on 3400 sets of experimental data, while the prediction accuracy is analyzed based on the errors of the training and test samples. The effects of six operation parameters on system performance are examined, while the bi-objective optimization for maximum thermal efficiency and maximum net output work is investigated. Results indicate that the component response times for startup stage and stop stage are 90s and 300s, respectively. Increasing the mass flow rate, decreasing the expander outlet temperature and increasing the expander inlet temperature ensure a higher net output work, while increasing the expander inlet temperature, decreasing the expander outlet temperature and increasing pump outlet pressure enable a higher thermal efficiency. The optimum net output work and thermal efficiency from Pareto-optimal solution are 2.87 kW and 8.855%, respectively.

Experimental study on unbalanced response characteristics of the impeller of mixed transport pump in deep-sea mining

The mixed transport pump is the core equipment of hydraulic lifting deep-sea mining system. The conveying medium is a solid-liquid two-phase flow. The impeller is prone to mass eccentricity due to the wear of ore particles. Therefore, it is great significance to study the unbalanced response characteristics of the impeller of the mixed transport pump. The unbalanced test of the impeller of the pump was carried out in a closed-cycle test bench. The unbalanced response characteristics were proved by data analysis method. The results indicated the hydraulic performance of the pump with the rotor system balance quality grade in G2.5 (scheme 2) was better than that of the balance quality grade in G6.3 (scheme 1). The pump efficiency was increased by 3.12%. When the medium was a solid-liquid two-phase flow, the amplitude of the vibration acceleration level ( La) of the pump outlet flange in scheme 2 was generally lower in the low frequency range than that in scheme 1. The periodic variation law of the pump outlet pressure coefficient ( Cp) was obvious. With the increase in the volume fraction of ore particle, the amplitude of the main frequency of the La in scheme 1 gradually was increased, which were 91.16, 97.11, and 102.57 dB, respectively. The main frequency amplitude of scheme 2 was basically unchanged. The main frequency amplitude change rates of the two schemes were −1.72%, −7.58%, and −12.78%, respectively. With the increase in the running time, the periodic change trend of the time-domain signal of the pump outlet flange vibration acceleration in scheme 1 was more obvious than that in scheme 2. The axial passing frequency amplitude was gradually increased. The pump efficiency was gradually decreased. Finally, the sliding bearing B2 was severely worn and the service life was greatly reduced.

Control Strategy of Speed Segmented Variable Constant Power Powertrain of Electric Construction Machinery

Energy conservation and emission reduction have become a global development consensus. Traditional construction machinery driven by an engine has high energy consumption and poor emission. Electric construction machinery is considered to be one of the main trends in the future due to its zero emissions by canceling the engine and using the motor-driven hydraulic system. However, most of the existing electric construction machinery works through the motor to simulate the engine without considering the regulation characteristics of the motor. Therefore, although the existing electric construction machinery improves the emission and the energy efficiency of the power system to a certain extent, the control of the motor and hydraulic systems can still be further optimized. The energy efficiency of the whole machine can be maximized. Based on the LUDV system of construction machinery, a control strategy based on motor speed classification and variable constant power can automatically identify the actual working conditions of the electric excavator and adjust the starting pressure of the constant power valve, to change the constant power range of hydraulic pump and achieve the goal of adapting to the working conditions of power system, is proposed. Simulation and experiments are carried out to verify the feasibility of the proposed control strategy. The results show that the speed classification and variable constant power control system can effectively realize the hierarchical regulation of motor speed and provide relatively stable speed input for the hydraulic system. Moreover, the current working condition can be identified through the pump outlet pressure. The adaption of the working conditions can be realized through the proportional reducing valve by adjusting the starting pressure of the variable constant power valve.

Analysis of a novel combined cooling and power system by integrating of supercritical CO2 Brayton cycle and transcritical ejector refrigeration cycle

This paper presents a novel combined cooling and power (CCP) system that integrates a supercritical CO2 Brayton (sCO2) cycle and a transcritical ejector refrigeration cycle. The two cycles are combined by a heat exchanger wherein heat is exchanged between CO2 and the refrigerant at supercritical pressures to reduce exergy destruction and improve system performance. A thermodynamic model was established to simulate the CCP system based on energy and exergy balance equations. The transcritical ejector model was validated with experimental and literature data. The performance of the system was studied for different CO2 mass flow rates, turbine inlet temperatures, turbine inlet pressures, turbine outlet pressures, and pump outlet pressures. The thermal, exergy, and effective efficiencies of the CCP system were compared with those of a combined cooling and power system (CCP_ab) that uses a single-effect absorption refrigeration cycle. The CCP system maximum thermal efficiencies of four refrigerants—R32, R134a, R1234yf, and R1234ze—were obtained using a genetic algorithm. The results show that the major components that contribute in exergy destruction are internal heat exchanger, ejector, compressor and turbine, and the heat exchanger has small exergy destruction because of a good variable-temperature match between the supercritical pressure refrigerant and supercritical pressure CO2. The effective efficiency of the CCP system reaches 0.42 at turbine inlet temperature of 873.15 K. The CCP system is more stable and efficient than the CCP_ab system in varying conditions. The CCP system with R32 has the highest thermal efficiency. R1234ze with relatively high thermal efficiency and low Global Warming Potential is a good choice in the future as it is environmentally friendly.

Investigation on pressure fluctuations induced by flow instabilities in a centrifugal pump

To investigate the pressure fluctuations induced by internal flow instabilities with flow rate variations in a centrifugal pump, combining numerical and experimental methods are applied to detect the complex flow state and identify safe and stable operating conditions of the pump. An analysis of the velocity and vorticity field based on the Q-criterion shows that a region of intensely unstable flow, including rotating stall, leakage vortices, wake flow, backflow and secondary flow, is concentrated upstream of the flow channel near the pump hump point. It was found from the experiments that the extremum of the main frequency of the pressure fluctuations at the pump inlet rapidly decreases to the local minimum value near the pump hump point. And an apparent broadband of the pressure fluctuations at the pump outlet is created between 100 and 150 Hz as the flow rate increases from 0 to 0.4 Qd. Relationships between the flow instabilities and the pressure fluctuations at the pump inlet and outlet are determined to formulate an effective detecting method for the flow state, while the pump outlet pressure fluctuations can serve as indicators of instabilities induced by flow rate variations in the centrifugal pump.

Experimental study on the operating characteristics of refrigerant pumps for solar ejector refrigeration systems

A bench performance test for a refrigerant pump was built to analyze the variations among parameters such as flow rate, head, rotational speed, efficiency/total efficiency and power consumption of a multistage centrifugal pump under different working conditions. The study showed that the outlet pressure, differential pressure and power consumption of the pump increased with increasing frequencies at the rated flow rate of 1 m3/h and inlet pressure pc = 0.454 MPa. The total pump efficiency showed a trend toward first increasing and then decreasing, and the maximum value was approximately 27.7%. When the refrigerant pump was at a frequency of 37.5 Hz and the inlet pressure was between 0.338 and 0.523 MPa, the pump outlet pressure and differential pressure decreased with increasing flow rates, and the pump outlet pressure increased with increasing inlet pressures. While the pump differential pressure increased with the increase in suction pressure, the pump power consumption increased with the increase in flow and increased slowly with the pump inlet pressure. With the increase in the flow rate, the total efficiency of the pump showed a tendency toward first increasing and then slowly declining. The total efficiency of the pump was between 4.0% and 30.2% at flow rates between 0 and 1.8 m3/h. Under the same conditions, when the pump operated under low flow rate and high pressure differential conditions, and the refrigerant pump efficiency was low.

회전 억제용 플로팅 링 실을 사용한 7톤급 터보펌프의 실매질 시험 고주파 신호 분석

A floating ring seal in turbopump is frequently employed to control the leakage through the secondary flow passage. Depending on its shape and operating conditions of the turbopump, the floating ring seal can have excursive motions and such motions induce strong pressure fluctuations, wear, and frictional oxidation due to rubbing between impeller and pump casing. It affects pump inlet and outlet pressures resulting in unstable operation or, in severe cases, failure of the turbopump. In this study, high-frequency signals from an accelerometer and pressure fluctuation sensors installed on the LOX pump were measured. Frequency spectrums and Root Mean Square (RMS) values were calculated in the real-propellant test for 7-tonf turbopump using two types of floating ring seal, the normal floating ring seal and the anti-rotating floating ring seal. The specific instability frequencies were investigated, and visual inspection was conducted to estimate the structural and hydrodynamic stabilities for 7-tonf turbopump. In consequence, the anti-rotating floating ring seal is able to effectively reduce the unstable pressure fluctuations and the wear compared to the normal floating ring seal.

Research on Control Method of the Power System of Stepping-Type Anchoring Equipment.

To improve the roadway adaptability and control accuracy of anchoring equipment, a stepping anchoring device was designed. A permanent-magnet synchronous motor control and a harmonic suppression algorithm were integrated to optimize the dynamic control system of stepping-type anchoring equipment. The results of an experimental simulation and analysis showed that when the coefficient of coal rock hardness f = 5, 6, and 7, the pulsation coefficient of the hydraulic pump outlet pressure, hydraulic motor output speed, and pump-controlled hydraulic cylinder advance speed in the hydraulic circuit of a pump-controlled motor did not exceed 3% after the equipment based on sliding mode control (SMC) entered the steady state, while the maximum pulsation coefficient was only 32.5% of the PI control. Based on the SMC, the harmonic components of the permanent magnet synchronous motor in the power system were suppressed and compensated for. This enhanced the stiffness of the hydraulic system under motor drive. When the rock stiffness factor gradually changed from f = 5 to f = 8 and increased suddenly from f = 5 to f = 6, the pressure overshoot at the outlet of the hydraulic pump of the pump-controlled motor system was reduced from 11.19% to 7.97% and from 61.19% to 52.88%, respectively, compared with that before the optimization. It was thereby proven that SMC based on harmonic suppression can effectively reduce the system pulsation caused by the multi-factor coupling of anchoring equipment and provide technical support for the optimal control of the power system of stepping-type anchoring equipment.