Dynamic Response of Pressure Compensated Variable Displacement Linkage Pump

2018 ◽  
Author(s):  
Nathaniel J. Fulbright ◽  
James D. Van de Ven
Keyword(s):  
Dynamic Model ◽  
Control Method ◽  
Response Times ◽  
Control Line ◽  
Displacement Control ◽  
Mechanical Pressure ◽  
Control Valves ◽  
Variable Displacement ◽  
Simulation Results ◽  
Displacement Control Method

The Variable Displacement Linkage Pump (VDLP) uses an adjustable planar linkage to vary the displacement of the piston. Previous work focused on dynamic modeling of the pump at fixed displacements and therefore did not account for the displacement control method or the dynamics of changing displacement. One key application of the VDLP is in pressure compensated, high-pressure water hydraulics. This paper expands on previous modeling work to include the behavior of the hydro-mechanical pressure compensation valves and the displacement control linkage. The multi-domain dynamic model captures the fluid dynamics in the pumping chambers and poppet-style control valves; the dynamics of the control valves; and the kinematics and kinetics of the two degree-of-freedom nine-bar pump linkage. The dynamic model was exercised in a simulation of the pump responding to changing demands in the output flow rate. Simulation results showed that quick response times of 100 milliseconds to a step in the load were achieved. Overshoot of the displacement is damped using an orifice in the control line. A physical prototype of the VDLP was used to validate the simulation results.

Intelligent Information of TS Fuzzy PID Control System of BLDCM

2013 ◽  
Vol 846-847 ◽  
pp. 313-316 ◽  
Author(s):  
Xiao Yun Zhang
Keyword(s):  
Control System ◽  
Dynamic Model ◽  
Pid Control ◽  
Control Method ◽  
Design Method ◽  
Fuzzy Pid ◽  
Fuzzy Pid Control ◽  
Control Precision ◽  
Simulation Results ◽  
Intelligent Information

This paper presented a new method based on the Fuzzy self - adaptive PID for BLDCM. This method overcomes some defects of the traditional PID control. Such as lower control precision and worse anti - jamming performance. It dynamic model of BLDCM was built, and then design method for TS fuzzy PID model is given, At last, it compared simulation results of PID control method with TS Fuzzy PID control method. The results show that the TS Fuzzy PID control method has more excellent dynamic antistatic performances, as well as anti-jamming performance. The experiment shows that TS fuzzy PID control has the stronger adaptability robustness and transplant.

Pseudo-Dynamic Testing Method Based on External Displacement Control

2012 ◽  
Vol 204-208 ◽  
pp. 2428-2432
Author(s):  
Da Peng Wang ◽  
Shi Zhu Tian
Keyword(s):  
Control Method ◽  
Dynamic Testing ◽  
Fast Response ◽  
Displacement Sensor ◽  
Internal Displacement ◽  
Displacement Control ◽  
Loop Control ◽  
Testing Technology ◽  
Hydraulic Servo ◽  
Displacement Control Method

In order to accelerate the velocity and improve the accuracy of the pseudo-dynamic testing，the external displacement control method is put forward based on the hardware control. The internal displacement sensor of the actuator is invalid on control and substituted by the LVDT displacement sensor connected with the specimen. The process of the feedback displacement and command error compensation is quickly implemented by the internal closed-loop control of the actuator. Compared with the iteratively approximate load control, this method not only makes the testing velocity fast, but also enables the error between command and feedback to be “zero”. The fast pseudo-dynamic testing about a cantilever beam is carried out by applying appropriate PID parameters of the actuator. The testing result shows that although this method has rather high requirements in the control system and electro-hydraulic servo load device, and the risk to some extent, the fast response of the actuator can be firmed by applying appropriate PID control parameters. This method provides a fast testing technology for velocity-dependent structures or specimens.

Study of Control Method Based on Hydromechanics for Hydraulic Impact of Open Hydraulic System in Concrete Pump

2014 ◽  
Vol 908 ◽  
pp. 320-325
Author(s):  
Wan Rong Wu ◽  
Zhen Wen Mao
Keyword(s):  
Hydraulic System ◽  
Control Method ◽  
Process Time ◽  
Displacement Control ◽  
Hydraulic Impact ◽  
Variable Displacement ◽  
Time Parameters ◽  
Concrete Pump ◽  
The Impact ◽  
Changing Process

According to the working principle of open hydraulic system in concrete pump, and though the theoretical analysis on the phenomenon of hydraulic impact in direction changing process, it concluded that the impact pressure has a linear relation with the displacement of the main oil pump .To solve the hydraulic impact problem ,a variable displacement method was proposed .Under the requirement of piston not striking the bottom of cylinder and piston stroke control accuracy ,the authors optimized the pumping direction changing process time parameters and the displacement control time parameters . Though the AMESim modeling simulation and experimental study , the variable displacement control method is proved feasible on reducing the hydraulic impact in direction changing process.

Control Strategy of the Dual Motors Coupling Propulsion for Battery Electric Buses

2014 ◽  
Vol 528 ◽  
pp. 364-370 ◽  
Author(s):  
Guang Wei Han ◽  
Cheng Ning Zhang ◽  
Shuo Zhang ◽  
Xiao Hua Wu
Keyword(s):  
Dynamic Model ◽  
Control Strategy ◽  
Control Method ◽  
Coordinated Control ◽  
Drive System ◽  
Simulation Platform ◽  
City Bus ◽  
Working Principle ◽  
Simulation Results

A novel drive system the Dual Motors Coupling Propulsion (DMCP) for battery electric buses was proposed, and its structure and working principle were introduced. For the power and comfort performance of the vehicle, the control method of the motors and the coordinated control strategy of the DMCP were developed. The co-simulation platform of AMESim and Simulink was established, based on which the dynamic model of the vehicle equipped the DMCP was built. The simulation results show that the DMCP runs smoothly in the Chinese typical city bus driving schedule. This indicates that the control strategy can manipulate the DMCP to drive the bus powerfully and smoothly. This has laid the foundation of the further research of the DMCP.

Strong-Form Formulated Generalized Displacement Control Method for Large Deformation Analysis

2017 ◽  
Vol 09 (07) ◽  
pp. 1750101 ◽  
Author(s):  
Judy P. Yang ◽  
Jian-Yu Chen
Keyword(s):  
Numerical Integration ◽  
Large Deformation ◽  
Control Method ◽  
Strong Form ◽  
Collocation Methods ◽  
Deformation Analysis ◽  
Displacement Control ◽  
Large Deformation Analysis ◽  
Displacement Control Method ◽  
Generalized Displacement Control Method

The traditional analysis of geometric nonlinearity is mostly based on the weak-formulated Galerkin method such as the finite element method. The element nature has limited its application as a result of numerical integration in the governing equation and quality control of deformed mesh. In the middle of 1990s, the meshfree methods have been developed and become one leading research topic in computational mechanics. Especially, the strong form collocation methods require no additional efforts to process numerical integration and impose Dirichlet boundary condition, thereby making the collocation methods computationally efficient. In the incremental–iterative process, how to accurately reflect the change in the slope of the load–deflection curve of the structure and remain numerically stable are of major concerns. Thus, we propose a strong-form formulated generalized displacement control method to analyze geometric nonlinear problems, where the radial basis collocation method is adopted. The numerical examples demonstrate the ability of the proposed method for large deformation analysis.

Sign in / Sign up

Export Citation Format

Share Document