Lifting Mechanism Research Articles

The design and analysis of a hydro-pneumatic energy storage closed-circuit pump control system with a four-chamber cylinder

A decentralized variable electric motor and fixed pump (VMFP) system with a four-chamber cylinder is proposed for mobile machinery, such that the energy efficiency can be improved by hydro-pneumatic energy storage, and problems of closed-circuit pump-controlled systems including asymmetrical flow and speed limitation are addressed. One of the chambers is arranged to the energy storage accumulator to increase energy efficiency, while the other chambers are flexibly connected to the pump ports to achieve variable transmission ratios. The piston areas of the multiple chambers are designed at first to permit a symmetric single-rod cylinder, and secondly a switching system with three operating modes is presented to expand force-velocity capabilities. Then, the four-chamber cylinder system with three solenoid valves is designed to substitute for the traditional two-chamber boom cylinder in a 6-ton excavator. A valve switching logic, as well as a feedforward and feedback compound speed controller, are presented. Simulations conducted in a 6-ton excavator model show that the maximum velocity increases by 66 %, together with asymmetrical flows to diminish the low-pressure charging accumulator. Peak power and energy consumption are both reduced by more than 20 % compared with the VMFP using the two-chamber cylinder. The energy-saving characteristics of the 6-ton excavator are emphatically analyzed considering energy storage and re-utilization. At last, experiment verifications are conducted in a lifting mechanism to verify the proposed energy-storage system.

A Comparison Between Syncrolift and Floating Dry Dock

The maritime industry relies heavily on efficient and effective ship lifting mechanisms for vessel maintenance, repair, and construction. This abstract provides a concise overview of a comprehensive comparison between two prominent ship lifting technologies: Syncrolift and Floating Dry Dock. Syncrolift systems utilize a platform with synchronized lifting mechanisms, while Floating Dry Docks submerge to lift vessels. This comparative analysis delves into various aspects, including operational capabilities, cost-effectiveness, and adaptability to different vessel types. By examining the strengths and limitations of each technology, this study aims to provide valuable insights for maritime stakeholders, shipyards, and naval professionals seeking to optimize their ship lifting processes, enhance operational efficiency, and make informed decisions in the dynamic world of maritime operations. The findings presented herein contribute to a better understanding of these vital technologies and their role in shaping the future of ship maintenance and construction.

ДОСЛІДЖЕННЯ ПЕРЕДАТНИХ ВІДНОШЕНЬ ПЛАНЕТАРНИХ ПЕРЕДАЧ ПІДЙОМНО-ТРАНСПОРТНИХ МАШИН

Lifting and transporting machines (PTM) are one of the important equipment for the mechanization of work in various spheres of the national economy. In addition to the multi-rescue system, the cargo lifting mechanism also includes a winch. Winches with one drum, which have standard parameters - traction force from 3.2 to 125 KN at rope speed from 0.5 to 0.1 m/s, are most often used in PTM. Such winches include a two-stage gear reducer that connects the electric motor with the drum. Such a winch drive scheme is quite large and has considerable weight. One of the areas that will help reduce these indicators is the use of planetary gearboxes. They allow the use of winches in which the electric motor and gearbox are coaxial, and the planetary gearbox itself can be mounted in the drum. Such a drive scheme of the load lifting mechanism allows to reduce the dimensions and weight of the winch. The paper considers the calculation and compares the transmission ratios of planetary gears, which are used and can be used in lifting and transporting machines to reduce the dimensions and weight of cargo lifting mechanisms. Schemes of simple and closed planetary gears, as well as a scheme with three central gears, are given. The scheme of the planetary transmission with free gear wheels is considered. The presence of internal gears and several satellites makes planetary gears compact and light in weight. AII transmission with two internal gears and a free carrier allows to obtain significant transmission ratios with a small number of gears. Schemes of planetary gears with free gears allow you to change the angular speed of the output shaft.

High maneuverability of the falcon flying robot

AbstractThis paper presents a highly maneuverable flapping‐wing flying robot (FWFR) capable of achieving high speeds and large roll angles. The airfoil of the wing is designed based on lift and drag generation mechanisms, and the wing is manufactured using the expanded polypropylene injection method. Drawing inspiration from the tail fin of natural falcons, the tail is designed and an aerodynamic model is established to guide the tail control surface's variation range. During the flight test, the FWFR demonstrates outstanding maneuverability. It achieves a rapid roll angle of within 1 s. Moreover, it exhibits a rapid descent, reaching a descent rate of 15 m in 2 s. Additionally, the FWFR attains a maximum speed of 20 m/s. The FWFR successfully executes several dive and turn maneuvers, thereby showcasing its exceptional maneuverability.

Vibration Analysis of the Damaged Bearing Unit of the Port Crane Lifting Mechanism

Vibration Analysis of the Damaged Bearing Unit of the Port Crane Lifting Mechanism

Development of an automatic reading recognition system for liquid-in-glass thermometers based on deep learning

The reading recognition system based on computer vision technology can improve the reading efficiency and accuracy of liquid-in-glass thermometers (LiGTs), and avoid the error caused by the human-eye reading method. Due to the requirement of a large field of view in the reading recognition process, the targets of LiGTs in the image are small and the accuracy of traditional computer vision (TCV) methods is undesirable. In addition, the potential shadow lines and the meniscus bottom on the image of LiGTs can also affect the robustness of the accuracy of the TCV methods. Around these issues, this paper develops an automatic reading recognition system for LiGTs based on deep learning, which aims to improve the accuracy of automatic reading recognition. Specifically, the cameras in our system are assisted in acquiring ideal images of LiGTs through the back-light illumination and lifting mechanism. Then a multi-task attention network and a general alignment processing module are designed for reading recognition on images of LiGTs. Experimental results on two self-built thermometer datasets prove that the system designed in this study can accurately recognize the temperature reading of LiGTs, and the performance of the proposed method outperforms other reading recognition methods.

Development of the mathematical model of the hydraulic drive of the lift mechanism of the working equipment of the front loader

Development of the mathematical model of the hydraulic drive of the lift mechanism of the working equipment of the front loader

Research of Kinematics and Dynamics of the Lever Lifting Mechanism Used in the Mobile Automotive Lift

Most of the arm lifts used in today’s industry are designed and manufactured based on the scissor mechanism. Such schemes have one drawback: when the mechanism is raised, their connection points with the base and the movable platform narrow, which leads to a let-down in its stability. This article proposes a new scheme for the lifting device, which eliminates the above disadvantage of scissor schemes. In the scheme developed by the authors, the joints connecting the mechanism to the moving platform and the base are fixed, which means that the distance between the connection points does not change, leading to its stable operation. The mechanism consists of one group of links of the second class and two groups of links of the fourth class. The article focuses on the stability of an automotive lift’s design when moving with a load. The article presents the results of a kinematic and kinetostatic analysis, a study of the stability of the lift and the results of studies of an experimental sample of the developed lift. The methods presented in this article allow for the design of automotive lifts with new lever mechanisms, as demonstrated by computer modeling and experiments.

Modulating the Perceived Softness of Real Objects Through Wearable Feel-Through Haptics.

In vision, Augmented Reality (AR) allows the superposition of digital content on real-world visual information, relying on the well-established See-through paradigm. In the haptic domain, a putative Feel-through wearable device should allow to modify the tactile sensation without masking the actual cutaneous perception of the physical objects. To the best of our knowledge, a similar technology is still far to be effectively implemented. In this work, we present an approach that allows, for the first time, to modulate the perceived softness of real objects using a Feel-through wearable that uses a thin fabric as interaction surface. During the interaction with real objects, the device can modulate the growth of the contact area over the fingerpad without affecting the force experienced by the user, thus modulating the perceived softness. To this aim, the lifting mechanism of our system warps the fabric around the fingerpad in a way proportional to the force exerted on the specimen under exploration. At the same time, the stretching state of the fabric is controlled to keep a loose contact with the fingerpad. We demonstrated that different softness perceptions for the same specimens can be elicited, by suitably controlling the lifting mechanism of the system.

Design of Digital Twin System for Harbor Cranes Based on Unity 3D

Port container crane (shore bridge) is an important equipment for container loading and unloading in the port, and its working mechanism includes four parts: lifting mechanism, operating mechanism, operating system and equipment structure. In this paper, digital twin technology is integrated to realize the digital mapping of quay bridge operation, which is the basis for realizing predictive maintenance. As a link between the physical space and the digital space, the digital twin is based on a new generation of information technology, which can complete the mapping of the real space in the digital space, so as to reflect the whole life cycle process of the corresponding physical equipment, and can derive related other functions on this basis. Firstly, the bridge was constructed using 3D modeling software solid works, and the mapping and model format conversion were carried out using 3ds Max. Finally, the 3D model was imported into Unity and the port virtual environment was built. Combined with C#, the driving engine of the lifting mechanism and operating mechanism of the quayside bridge is developed, and the virtual and real synchronous operation of the quayside bridge is finally realized.

Use of weight measurement algorithm on the basis of moving average filter in the recorder of overhead crane operation parameters

Introduction. The problem of primary information low quality of crane operation parameters recorders is analyzed. The accepted direction to improve the quality of information about the mass of the cargo is to improve the algorithm of weight measurement. Shortcomings of algorithms of serially produced parameter recorders are described. The design of the algorithm based on the moving average filter is proposed.Materials and Methods. The principle of operation of the proposed weight measurement algorithm is described. The algorithm consists of preliminary (determination of the dynamic process section suitable for weight measurement, calculation of the smoothing window length) and main stages (application of filter, calculation of mass and measurement error). Two methods for determining the length of the smoothing window are given. The parameters of the overhead crane, load cell and motor speed sensor used in the experimental part are given.Results. Graphs of lifting mechanism force and motor rotation speed at the moment of weight measurement are given. The work of the steady-state motion control function is shown. The results of algorithm operation at fixed measurement accuracy of 3% with determination of algorithm operation time and fixed algorithm operation time of 10 seconds with determination of measurement accuracy are given.Discussion. The time of weight measurement with the accuracy required for parameter recorders was 2...5 seconds. Increase in speed of weight measurement is achieved due to adjustable parameters of the algorithm at each switching on of the lifting mechanism. For cranes with duration of lifting time continuously more than 10 seconds the algorithm allows to calculate the mass of the load with an accuracy of 1%. This ensures the accuracy of the crane intensity indicators with an accuracy of 3%.Conclusion. Evaluation of accuracy and time parameters showed the applicability of the developed algorithm of weight measurement in the task of determining the mass of the load to recorders of crane operation parameters. The advantage of the developed algorithm is the guaranteed accuracy of weight measurement. The algorithm of weight measurement allows to adapt the parameter recorder to the technological process of crane operation and effectively use the areas of the dynamic process suitable for measurement.

EVALUASI PERMASALAHAN GAS INTERFERENCE PADA ELECTRICAL SUBMERSIBLE PUMP DI SUMUR MD-17

Natural flow can not be performed in the reservoir from the MD-17 well. The most likely reason is because it is classified as a mature well, so an Artificial Lift is needed. The artificial lifting mechanism used is the Electrical Submersible Pump. In this research, the writer analyze the problem of "Gassy" condition or interference. The MD-17 well problem shows that the free gas in this well is 245.213 mscf. Moreover, the amount of free gas that enters the Pump is 8%. From these problems, it causes ESP become disrupted and not produce optimally. The solution to the gas interference problem at the MD-17 Well is the bleed off method and using Advance Gas Handling. The first method is with bleed off method for improve ESP performance so that production will be stable. Then the second method of handling gas interference is by using Advance Gas Handling. From the data analysis and calculation with the formula for AGH, it can produce efficiency in dealing with Gas Interference, so can produce 64.4 mscf of gas from Pump Intake and then can increasing production.

A Hybrid Strategy for Profile Measurement of Micro Gear Teeth.

A hybrid strategy is proposed to meet the challenge of obtaining the profile of micro gear teeth with a small modulus. Firstly, the contact probe segmentally obtained the falling flank profiles with an auxiliary lifting mechanism to avoid interference when it climbs on the rising slope. Then, the noncontact chromatic confocal displacement sensor efficiently acquired the gear peak positions to carry out the two-point error separation with the gear peak positions from the probe measurement. Finally, actual experiments were carried out to obtain the profile of a harmonic drive flexspline. Compared with the commercial ultraprecise profiler, the proposed method provides measurement results with a deviation of less than 20 μm. In conclusion, the hybrid strategy is feasible and accurate for drawing the micro gear teeth profile without any collision between the measuring probes and the measured workpiece.

High efficiency photothermal cyclic self-healing antibacterial coating based on in-situ dual-functional BiOI@Bi2S3

Although extremely challenging, it is highly desirable to develop self-healing materials that exhibit high efficiency under environmental conditions for marine protection applications. In this work, polyurethane elastomers with hydrogen bond and dimethylglyoxime–urethane (DOU) coordination complex were combined with in-situ dual-functional BiOI@Bi2S3 to synthesize high-efficiency photothermal cyclic self-healing antibacterial coating. The photothermal efficiency of BiOI@Bi2S3 is improved by 38% through interfacial regulation. BiOI@Bi2S3/PU rapidly rises by 50.2 °C within 300 s under near-infrared (NIR) light, which can trigger the hydrogen bond of polyurethane coating and recover the barrier properties of the coating through self-healing. Density functional theory was used to simulate and analyze the generation of multiple electron transfer paths after the vulcanization of BiOI, which improves the interfacial mobility of photogenerated carriers and generates more heat. Importantly, molecular dynamics verified the self-healing mechanism of hydrogen bond and the photothermal lifting mechanism of the coating. After 5th scratches and self-healing cycle tests, the coating has a self-healing efficiency of more than 80%, which can ensure the self-healing and anticorrosion protection performance of the coating for multiple cycles. The photocatalytic and photothermal properties of BiOI@Bi2S3 enhance the antibacterial rate of the coating up to 99%. This work provides heuristic perspectives for the design of coatings with anti-corrosion, antibacterial and self-healing properties.

基于 Arduino 的小型蔬菜播种机远程控制系统设计与性能试验

Facilities greenhouses are relatively narrow and airtight, and the machine operation turns frequently. The existing vegetable seeders is supported by manual hand, and the straightness of operation is poor, Turning around is time-consuming and laborious. This paper designs a remote control system of small vegetable seeder based on Arduino microcontroller, the Arduino single-chip microcomputer remote control technology, multi-motor synchronous drive technology, differential-electric push rod combined with lifting and steering control and other methods are adopted, Through remote control, the forward, speed regulation, lifting of the whole machine and field line change and steering of the seeder during vegetable sowing are realized. The differential steering model and brushless motor speed control model are established, and the android human-computer interaction APP is designed to realize the remote precise control of vegetable seeder. The performance test of the accuracy of the control system was carried out with the accuracy and steering accuracy of the seeder. The results showed that : under the condition of medium speed and medium and low speed operation, the seeding level of vegetable seeder is the most stable and reliable, the speed deviation rate of the seeder is 1.59 %, after starting the drive motor for 2s, the actual speed is close to the target speed, differential steering is relatively accurate, the qualified rate of steering is more than 89.8 %, the synchronous speed error of the lifting mechanism tends to be stable.This study can provide reference for the development of intelligent equipment for facility agriculture.

Mimicking the Mechanism of Lift Generation in Dragonflies

Human pursuit of flight has learnt many lessons from nature and a few adaptations have led to phenomenal progress. Insect flight uses complex unsteady aerodynamics to generate lift in addition to producing thrust. A close look at the dragonfly provides some clues to mimic its flight using passive means by separating propulsion and lifting mechanisms. Though the dragonfly can independently flap each of its wings to generate lift and thrust, during forward flight, fore-wings alone flap while the aft-wings remain nearly steady. We adopt this as basis for new passive configurations to generate steady lift. Conceptually, we replace fore-wings with a cylinder that is known to shed vortices, to mimic flapping. A simple plate replaces the aft-wings. Flow analysis of such a configuration at Reynolds Number of 7500 revealed a steady flow topology featuring a trapped vortex over the plate, resulting in steady lift to drag ratio of 3. A further optimized configuration consisting of a semi-circular cylinder upstream and a cambered plate downstream resulted in lift to drag ratio of 14.5, which is considerable for these flow regimes, opening up new possibilities for design of nano-flight vehicles.

An Arduino-based voice-recognition elevator for special purposes

<p><span>This paper presents the design and implementation of five floors electrical elevator system that utilizes voice recognition technology, specifically using an Arduino microcontroller, for special applications. The purpose of this project is to provide a convenient and accessible means of transportation for individuals with disabilities, specifically those who may have difficulty using traditional elevators due to physical limitations or mobility issues. The system consists of an Arduino microcontroller, a voice recognition module, a motor driver, and an elevator car with a lift mechanism. The microcontroller receives voice commands from the user and processes them to determine the desired floor. The motor driver then activates the lift mechanism to move the car to the desired floor. The system was tested and found to be reliable and efficient in transporting individuals to their desired floor. It has the potential to greatly improve the accessibility and convenience of buildings for individuals with disabilities.</span></p>

SOLIDWORKS AS AN INNOVATIVE MEANS OF RESEARCHING AUTOMOTIVE ENGINEERING

The main directions of improving the reliability of automotive equipment during repair include the performance of disassembly and assembly work without damage to parts. And for this you need to use lifters, stands, pullers, racks and other devices and means of mechanization. Therefore, the possibilities of designing devices for automobile transport with the help of SolidWorks are considered: a crane lifting mechanism, a stand for straightening deformed stamped wheels of passenger cars, bearing removers, a device for compressing the springs of the front suspension of passenger cars, a device for mounting and dismounting brake drums, a two-post electrohydraulic lifter.

Dynamic characteristics of the rack and pinion lift mechanism of the combined command cabin

This paper presents a novel approach to accurately simulate the dynamic characteristics of a rack and pinion lifting mechanism while accounting for the coupling effect of meshing tooth pair stiffness and grease characteristics in real-world environments. A structure-grease coupling meshing stiffness model is established based on the deformation coordination conditions of the tooth pair meshing. The model incorporates the effect of the grease stiffness term on the time-varying meshing stiffness of the rack and pinion. By analyzing the dynamic characteristics of the combined command cabin lifting mechanism using this model, we find that the total meshing stiffness of the gear teeth is lower when the transient thermoelastic flow effect of the grease is considered. Furthermore, the total stiffness value decreases as the normal meshing force at the meshing point decreases. This research reveals that the worst lubrication conditions are typically found on the gear wheel teeth near the base circle, where the grease film temperature rise is highest, the grease film pressure is highest, and the grease film thickness is thinnest.

A gas dynamic perspective on particle lifting in electrostatic discharge-like devices using multiphase particle-in-cell approach

Although particle–laden electrostatic discharges are widely used in laboratories as well as in industrial applications, the mechanism of particle lifting for particles initially at rest in such highly unsteady systems is not well understood. A multiphase gas–particle solver is developed using the multiphase particle-in-cell (MP-PIC) approach to emulate the interaction of a compressible shock-dominated gas phase with the dense particle phase. First, the two-way coupled solver is initially used to study the interaction of a planar traveling shock with a vertical curtain of particulates. The gas and particle phase evolution was found to be in good agreement with a similar experimental study in Ling et al. [Phys. Fluids 24, 113301 (2012)]. Second, the MP-PIC code is used to study the interaction of an expanding blast wave with a thick bed of particles. The simulation considered forces such as quasi-steady drag, pressure-gradient, added-mass, Saffman, and Magnus forces. We observe that the vertical liftoff particles close to the shock impingement point in this configuration are associated with the quasi-steady drag, pressure gradient, and added-mass forces. Also, the Saffman lift and Magnus forces contribute to lifting particles located radially farther away from the shock impingement point. In addition, the study finds a decrease in particle lifting efficiency with decreasing plasma kernel length and shock strength.