scholarly journals Probability analysis of dynamical effects of axial piston hydraulic motor

2018 ◽  
Vol 157 ◽  
pp. 03016
Author(s):  
Alzbeta Sapietova ◽  
Vladimír Dekys ◽  
Milan Sapieta ◽  
Peter Sulka ◽  
Lukas Gajdos ◽  
...  
Keyword(s):  
Analytical Solution ◽  
Impact Force ◽  
Probability Analysis ◽  
Hydraulic Motor ◽  
Probabilistic Description ◽  
Probabilistic Solution ◽  
Input Variables ◽  
Axial Piston ◽  
Proper Operation

The paper presents an analysis of impact force on stopper screw in axial piston hydraulic motor. The solution contains probabilistic description of input variables. If the output parameters of probabilistic solution are compared with arbitrary values and values acquired by analytical solution, the probability of proper operation of the device can be evaluated.

Analogue and Digital Modelling in the Design of a Hydraulic Vehicular Transmission

1979 ◽  
Vol 193 (1) ◽  
pp. 277-286 ◽  
Author(s):  
J. V. Svoboda
Keyword(s):  
Combustion Engine ◽  
Digital Simulation ◽  
System Stability ◽  
Prime Mover ◽  
Hydraulic Motor ◽  
Acceleration And Deceleration ◽  
Variable Displacement ◽  
Overall Efficiency ◽  
Hydraulic Accumulator ◽  
Axial Piston

This paper is concerned with the design and development of a hydraulic hybrid urban vehicle power plant using a small internal combustion engine prime mover, a hydraulic transmission, and a hydraulic accumulator as a small energy store. The driver controls the vehicle velocity by operating the swashplate of the axial-piston variable-displacement hydraulic motor. The remaining system inputs, i.e., the engine throttle and swashplate of the axial-piston variable-displacement hydraulic pump, are governed by a multiloop electronic controller via electro-hydraulic servo-actuators. The system aims to achieve a high overall efficiency by utilizing the hydraulic accumulator to maintain optimal loading of the prime mover and to provide regenerative braking. The design was aided by an analogue simulation implemented on an EAI 690 hybrid computer. For the final quantitative evaluation of the system, a digital simulation program was written using the MIMIC processor. Realistic modelling was attained in both cases by using manufacturers' data for commercially available components to define the dynamic response and efficiency of the individual elements of the overall system. The simulation model was subjected to accelerator/decelerator step input signals under various road conditions. ‘Drives’ through the standard LA-4 and EPA standard urban cycles were performed. The simulation results showed high system stability, satisfactory acceleration and deceleration performance and a good overall efficiency.

scholarly journals Axial Piston Hydraulic Motor with Heightened Control Range

2015 ◽  
Vol 100 ◽  
pp. 1455-1458
Author(s):  
Vladimir Osipov ◽  
Boris Vorotyntsev ◽  
Sergey Stazhkov ◽  
Vladimir Tsvetkov ◽  
Albert Kiev ◽  
...  
Keyword(s):  
Hydraulic Motor ◽  
Control Range ◽  
Axial Piston

scholarly journals Simulation and experimental response of four-bar mechanism with tolerance stack

2019 ◽  
Vol 13 (1) ◽  
pp. 4512-4535
Author(s):  
Chandrashekhar A. Akhadkar ◽  
Ashish B. Deoghare ◽  
Adwait M. Vaidya
Keyword(s):  
Angular Velocity ◽  
Unique Feature ◽  
Impact Force ◽  
Contact Stiffness ◽  
Experimental Setup ◽  
Force Method ◽  
Contact Data ◽  
Experimental Response ◽  
Input Variables ◽  
Contact Parameters

An Equivalent Contact Stiffness (ECS) approach is proposed in this article to estimate the precise contact parameters for a revolute joint. Estimated contact parameters are used as input variables for the MBD simulation of a four-bar mechanism with tolerance stack. Simulations were carried out using Impact Force Method (IFM) and Restitution Method (RM) in MSC ADAMS. An experimental setup of the four-bar mechanism is developed with a unique feature to measure the angular velocity of the follower with respect to the crank position. The effect of tolerance stack on the angular velocity of the follower is investigated experimentally to validate the MBD simulation. The angular velocity of coupler and rocker is increased by 15.69% and 27% respectively due to tolerance stack. MBD analysis using the ECS approach provides accurate and reliable results in absence of experimental contact data. This work shall facilitate the designers to simulate the actual behaviour of the mechanism prior to prototype.

The Torque on the Swashplate of Axial Piston Variable Displacement Pumps With Conical Cylinder Blocks

2018 ◽  
Author(s):  
Yapeng Xu ◽  
Kai Guo ◽  
Jianfeng Li ◽  
Keyu Wang
Keyword(s):  
Angular Velocity ◽  
Analytical Solution ◽  
Centrifugal Force ◽  
Dynamic Models ◽  
Chamber Pressure ◽  
Load Torque ◽  
Load Pressure ◽  
Variable Displacement ◽  
Axial Piston ◽  
Variable Displacement Pumps

In this paper, the load torque on the swashplate of axial piston variable displacement pumps with conical cylinder blocks is studied. At present, general analytical solution for the load torque of axial piston variable displacement pump is not available, which makes the dynamic analysis and controller design an uneasy work. The main contribution of this paper is that the analytical solution of the swashplate torque caused by piston inertia and centrifugal force was derived. First, based on the piston acceleration and centrifugal force, the piston kinematic and dynamic models were developed, the analytical solution of the swashplate torque caused by piston inertia and centrifugal force was derived. In addition, the piston chamber pressure dynamics were established, the pressure distribution in the cylinder bore and the load torque of the swashplate under different working conditions were obtained. Finally, the relationship between the swashplate average load torque and the swashplate angle, swashplate angular velocity, pump load pressure and the pump input shaft velocity was uncovered. It is shown that the swashplate angle has greater influence on the load torque when the pump load pressure is higher, besides, it is interesting to observe that the swashplate angular velocity has a damping influence upon swashplate dynamics which helps to stabilize the swashplate during pump displacement regulation transients.

Study on Structural Optimization and Wear of Slipper Pair in Axial Piston Hydraulic Motor

2012 ◽  
Vol 482-484 ◽  
pp. 1495-1499
Author(s):  
Zhong Ning Zhou ◽  
Yong Xia Gu ◽  
Li Na Ma
Keyword(s):  
Flow Field ◽  
Structural Optimization ◽  
Hydraulic Motor ◽  
Lubrication Film ◽  
Wear And Tear ◽  
Bottom Face ◽  
Axial Piston ◽  
Lubrication Effect

The flow field of lubrication film under the bottom of the slipper was analyzed particularly. Taking into account of the rotation and self-rotation of the slipper, got the velocity of lubrication film under the bottom. By machining some regular concaves convergenting along radial in slipper’s bottom face，to enhance lubrication effect ,and improve the wear and tear situation in the outer fringe.

Experimental Research on Wear Loss of Slipper Pair in Axial Piston Hydraulic Motor Lubricated with High Water Based Fluid

2012 ◽  
Vol 452-453 ◽  
pp. 119-123
Author(s):  
Yong Xia Gu ◽  
Zhong Ning Zhou ◽  
Fei Gao
Keyword(s):  
Experimental Research ◽  
High Water ◽  
Experimental Results ◽  
Wear Volume ◽  
Wear Loss ◽  
Hydraulic Motor ◽  
Water Based ◽  
Wear And Tear ◽  
Axial Piston

The slipper pairs with concaves of reasonable and unreasonable structures and without concave originally are chosen for the experiment. The experimental results show that appropriate concave distribution can improve the wear and tear condition of the slipper bottom. Under the same experimental condition, the fringe wear volume can be reduced by 28.77%, and the overall wear volume 68.72%, which is the best result.

Speed characteristics analysis and simulation of the water hydraulic axial piston motor

2016 ◽  
Vol 13 (6) ◽  
pp. 524-528 ◽  
Author(s):  
Lijie Yang ◽  
Guimei Wang ◽  
Songlin Nie
Keyword(s):  
Numerical Models ◽  
Simulation Models ◽  
Hydraulic Motor ◽  
Content Type ◽  
Swash Plate ◽  
Characteristics Analysis ◽  
Key Factor ◽  
Speed Performance ◽  
Water Hydraulic ◽  
Axial Piston

Purpose The purpose of this study is to analyze the speed characteristics of the water hydraulic axial piston motor. The speed performance of water hydraulic piston motor which uses water as medium is different from that mineral oil one. Design/methodology/approach To analyze the speed characteristics of the water hydraulic motor, the speed model of a swash plate water hydraulic piston motor is developed theoretically and a simulation model with AMESim is built. Findings The effects of clearance between friction pairs and input pressure on the speed are analyzed and compared between the theoretical and numerical models. Originality/value The results of the theoretical and simulation models both verify that the clearance of friction pairs is the key factor in the hydraulic piston motor’s speed.

The Dynamic Performance of an Electrohydraulic Servovalve/Motor System With Transmission Line Effects

1987 ◽  
Vol 109 (1) ◽  
pp. 14-18 ◽  
Author(s):  
J. Watton
Keyword(s):  
Analytical Solution ◽  
Transient Response ◽  
Coulomb Friction ◽  
Motor System ◽  
Method Of Characteristics ◽  
Dynamic Performance ◽  
Small Signal ◽  
Basic System ◽  
Large Signal ◽  
Axial Piston

The transient response of an electrohydraulic servovalve coupled to an axial piston ball motor is analyzed. In particular, the effect of long lines between the servovalve and motor is studied together with coulomb friction effects at the motor. The dynamic characteristics of the basic system with short lines is first established via frequency response measurements coupled with a small signal linearized analysis. Longer lines are then added and the method of characteristics, coupled with a quasi-analytical solution for the motor-end equations, is used to predict the large signal transient response. The importance of coulomb friction damping is established together with damping due to servovalve dynamics.

scholarly journals Analytical solution of the longitudinal wave propagation due to the single impact

2018 ◽  
Vol 37 (4) ◽  
pp. 849-858
Author(s):  
M Akhondizadeh
Keyword(s):  
Wave Propagation ◽  
Analytical Solution ◽  
Longitudinal Wave ◽  
Impact Force ◽  
Initial Condition ◽  
Simple Assumption ◽  
Longitudinal Wave Propagation ◽  
The Common ◽  
The Impact ◽  
Sinusoidal Function

In the present work, the rod response due to the impact of a ball is studied in order to analyze the longitudinal wave propagation during the impact and evaluate the velocity of points over the rod length at the end of impact. An analytical solution is given for the governing equation of rod vibration by assuming the impact force as an equivalent sinusoidal function of time. The impact force is defined by a Fourier series to be zero at the rod length except at the impacted end. An analysis of wave propagation will give information about the rod–ball interaction. The evaluated velocity profile at the end of impact can be used as the initial condition for after-impact solution of the rod vibration. It will modify the common simple assumption of constant initial velocity for impacted end.

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