Simulation Analysis of Control Strategy for TLT Wheel Coordination Based on Constant Pressure Network

2012 ◽  
Vol 591-593 ◽  
pp. 1962-1967
Author(s):  
Li Jun Zhao ◽  
Na Li ◽  
Tao Fang
Keyword(s):  
Control Strategy ◽  
Constant Pressure ◽  
Simulation Analysis ◽  
Good Control ◽  
High Power Density ◽  
Control Performance ◽  
Hydrostatic Transmission ◽  
Control Precision ◽  
Driving Condition ◽  
Further Development

Hydrostatic transmission with secondary regulation based on constant pressure network (CPN) has the advantages of stepless speedless regulation, high power density, etc. This paper applies it to a Towbarless Tractor (TLT) transmission system and aims to improve its wheel control precision. A control strategy for TLT wheel coordination under driving condition is proposed and simulation is carried out in our facing-backward simulation model. The results show that good control performance can be realized by the control strategy. It can effectively achieve the goal of antislip. Moreover, the simulation analysis provides significant reference values for further development of wheel coordination controllers.

Seismic Protection of Structures Using Tuned Mass Dampers with Resettable Variable Stiffness

2012 ◽  
Vol 83 ◽  
pp. 75-84
Author(s):  
Chi Chang Lin ◽  
Tsu Teh Soong
Keyword(s):  
Active Control ◽  
Control Strategy ◽  
Good Control ◽  
Variable Stiffness ◽  
Seismic Protection ◽  
Control Law ◽  
Control Performance ◽  
Deformation Diagram ◽  
Tuned Mass Dampers ◽  
Engineering Structures

Vibration control of civil engineering structures using tuned mass dampers (TMD) is a widely accepted control strategy after numerous analytical and experimental verifications. Although the design and application of traditional linear TMD systems are well developed, nonlinear TMD systems that may lead to better control performance are still in the developmental stage. There are two main problems associated with TMD systems, i.e. (1) detuning effect and (2) excessive stroke of TMD. In order to improve the performance of TMD systems, a novel semi-active TMD named resettable variable stiffness TMD (RVS-TMD) is proposed in this study. The RVS-TMD consists of a TMD and a resettable variable stiffness device (RVSD). The RVSD is composed of a resettable element and a controllable stiffness element. By varying the stiffness element of the RVSD, the force produced by the RVSD can be controlled smoothly through a semi-active control law. By resetting the resettable element, the hysteresis loop of the RVSD can cover all four quadrants in the force-deformation diagram and thus results in more energy dissipation. The harmonic and seismic responses of a building equipped with the RVS-TMD are investigated numerically and compared with those by its active control counterpart and an optimal passive TMD system. The results show that the proposed RVS-TMD system has good control performances as its active control counterpart and is able to alleviate detuning effect and reduce TMD’s stroke.

scholarly journals Multiparameter Control Strategy and Method for Cutting Arm of Roadheader

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Pengjiang Wang ◽  
Yang Shen ◽  
Xiaodong Ji ◽  
Kai Zong ◽  
Weixiong Zheng ◽  
...  
Keyword(s):  
Particle Swarm Optimization ◽  
Control Strategy ◽  
Simulation Analysis ◽  
Experimental Studies ◽  
Particle Swarm ◽  
Good Control ◽  
Control Effect ◽  
Swarm Optimization ◽  
Operation Analysis ◽  
Swing Speed

A multiparameter control strategy and method for the cutting arm of a roadheader is proposed through the operation analysis of roadheader. The method can address the problems of low intelligence and low cutting efficiency faced by the roadheader in the cutting process. The control strategy is divided into two parts: the cutting load identification part and the swing speed control part. The former part is designed using a backpropagation neural network that is optimized by an improved particle swarm optimization algorithm. The latter part is optimally designed using a fuzzy PID controller with improved simulated annealing particle swarm optimization. The simulation analysis in SIMULINK showed that the response time was reduced, proving the robustness of the method. In addition, experimental studies verified the good control effect of the method under different cutting states. The proposed method uses multiparameter to intelligently change the swing speed, providing a theoretical and practical basis for the realization of intelligent and unmanned cutting of roadheader.

Controlling chemical dosing for sulfide mitigation in sewer networks using a hybrid automata control strategy

2013 ◽  
Vol 68 (12) ◽  
pp. 2584-2590 ◽  
Author(s):  
Yiqi Liu ◽  
Ramon Ganigué ◽  
Keshab Sharma ◽  
Zhiguo Yuan
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Biological Processes ◽  
Control Performance ◽  
Hybrid Automata ◽  
Sewer Pipe ◽  
Physical Chemical ◽  
Iron Salts ◽  
Pumping Stations ◽  
Sewer Networks

Chemicals such as magnesium hydroxide (Mg(OH)2) and iron salts are widely used to control sulfide-induced corrosion in sewer networks composed of interconnected sewer pipe lines and pumping stations. Chemical dosing control is usually non-automatic and based on experience, thus often resulting in sewage reaching the discharge point receiving inadequate or even no chemical dosing. Moreover, intermittent operation of pumping stations makes traditional control theory inadequate. A hybrid automata-based (HA-based) control method is proposed in this paper to coordinate sewage pumping station operations by considering their states, thereby ensuring suitable chemical concentrations in the network discharge. The performance of the proposed control method was validated through a simulation study of a real sewer network using real sewage flow data. The physical, chemical and biological processes were simulated using the well-established SeweX model. The results suggested that the HA-based control strategy significantly improved chemical dosing control performance and sulfide mitigation in sewer networks, compared to the current common practice.

Application of PID in Controllable Pitch Propeller of a Multipurpose Ocean Tug

2013 ◽  
Vol 464 ◽  
pp. 253-257
Author(s):  
Hui Fang Chen
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
High Reliability ◽  
Control Process ◽  
Good Control ◽  
Control Performance ◽  
Hardware Configuration ◽  
Design Idea ◽  
And Control

This paper takes the automatic control system of controllable pitch propeller in a multipurpose ocean tug as an example to describe the application of the S7-200 series PLC in the control system of 4500 horse power controllable pitch propeller in detail. The principle of control system is addressed, as well as the hardware configuration, the design idea of the main software and control process. The system shows high reliability, accuracy and good control performance in practical in practical running.

scholarly journals Human manual control precision depends on vestibular sensory precision and gravitational magnitude

2018 ◽  
Vol 120 (6) ◽  
pp. 3187-3197 ◽  
Author(s):  
Marissa J. Rosenberg ◽  
Raquel C. Galvan-Garza ◽  
Torin K. Clark ◽  
David P. Sherwood ◽  
Laurence R. Young ◽  
...  
Keyword(s):  
Manual Control ◽  
Control Performance ◽  
Control Task ◽  
Altered Gravity ◽  
Control Precision ◽  
Functional Implications ◽  
Potential Risk Factors ◽  
And Performance ◽  
Human Exploration ◽  
Roll Tilt

Precise motion control is critical to human survival on Earth and in space. Motion sensation is inherently imprecise, and the functional implications of this imprecision are not well understood. We studied a “vestibular” manual control task in which subjects attempted to keep themselves upright with a rotational hand controller (i.e., joystick) to null out pseudorandom, roll-tilt motion disturbances of their chair in the dark. Our first objective was to study the relationship between intersubject differences in manual control performance and sensory precision, determined by measuring vestibular perceptual thresholds. Our second objective was to examine the influence of altered gravity on manual control performance. Subjects performed the manual control task while supine during short-radius centrifugation, with roll tilts occurring relative to centripetal accelerations of 0.5, 1.0, and 1.33 GC (1 GC = 9.81 m/s2). Roll-tilt vestibular precision was quantified with roll-tilt vestibular direction-recognition perceptual thresholds, the minimum movement that one can reliably distinguish as leftward vs. rightward. A significant intersubject correlation was found between manual control performance (defined as the standard deviation of chair tilt) and thresholds, consistent with sensory imprecision negatively affecting functional precision. Furthermore, compared with 1.0 GC manual control was more precise in 1.33 GC (−18.3%, P = 0.005) and less precise in 0.5 GC (+39.6%, P < 0.001). The decrement in manual control performance observed in 0.5 GC and in subjects with high thresholds suggests potential risk factors for piloting and locomotion, both on Earth and during human exploration missions to the moon (0.16 G) and Mars (0.38 G). NEW & NOTEWORTHY The functional implications of imprecise motion sensation are not well understood. We found a significant correlation between subjects’ vestibular perceptual thresholds and performance in a manual control task (using a joystick to keep their chair upright), consistent with sensory imprecision negatively affecting functional precision. Furthermore, using an altered-gravity centrifuge configuration, we found that manual control precision was improved in “hypergravity” and degraded in “hypogravity.” These results have potential relevance for postural control, aviation, and spaceflight.

Constrained dynamic matrix control strategy for a monitoring system for AGC of hot strip mills

2020 ◽  
Vol 117 (3) ◽  
pp. 308
Author(s):  
Yin Fang-chen ◽  
Yu Liu-Qi
Keyword(s):  
Monitoring System ◽  
Control Strategy ◽  
Smith Predictor ◽  
Model Parameters ◽  
Control Performance ◽  
Dynamic Matrix Control ◽  
Dynamic Matrix ◽  
Model Mismatch ◽  
Hot Strip ◽  
Matrix Control

In the hot strip rolling process, the performance of a monitoring system for automatic gauge control (MN-AGC) is influenced greatly by the model mismatch which is caused by the variation of model parameters values. A constrained dynamic matrix control (CDMC) strategy that includes a prediction model, rolling optimization, and feedback correction was used in the MN-AGC. First, the conventional Smith prediction-based control strategy for the MN-AGC was analyzed. Second, the performance index function and optimal control of the CDMC strategy were determined. Finally, simulations and industrial experiments were conducted. The results showed that both control strategies provided good control performance. When model mismatch occurred, the Smith predictor-based MN-AGC resulted in significant overshoot or even oscillations but the control performance of the CDMC-based MN-AGC was not influenced by changes in the model parameters.

Rocker Arm Force Analysis of Crown-Block Heave Compensation System Based on ADAMS

2017 ◽  
Vol 872 ◽  
pp. 266-270
Author(s):  
Zhen Dong Liu ◽  
Yan Ting Zhang ◽  
Lu Meng Huang ◽  
Kang Wang ◽  
Ming Bin Shi
Keyword(s):  
Simulation Analysis ◽  
System Control ◽  
Load Variation ◽  
Control Precision ◽  
Offset Distance ◽  
Small Load ◽  
Swing Arm ◽  
Adams Software ◽  
Variation Range ◽  
High Control

This paper compares three common installation ways of swing arm and carries out simulation analysis by using Adams software. The research results show that when using intercrossed enwinding wirerope, the swing arm will bear alternating load and the load variation range is huge, load G’ will change obviously and bring great impact on system control precision. When using along enwinding wirerope, the swing arm’s load is slightly bigger than wirerope tension and the load variation range is very small, load G’ will be static and it’s easy to get high control precision. By reducing the length of lower swing arm, increasing the length of upper swing arm and the offset distance, its working condition can be improved when using intercrossed enwinding wirerope.

Control Strategy and Simulation Analysis for Auto Electric Power Steering System

2011 ◽  
Vol 236-238 ◽  
pp. 1603-1606
Author(s):  
Li Na Chen
Keyword(s):  
Electric Power ◽  
Control Strategy ◽  
Simulation Analysis ◽  
Characteristic Curve ◽  
Steering System ◽  
Control Mode ◽  
Electric Power Steering ◽  
Power Steering System ◽  
Power Steering ◽  
Electric Power Steering System

This paper, while introduce development trend, basic structure and working principle for auto power steering system, is analyzing on characteristic curve of steering force in steering system. The paper proposed a control mode for electric power steering system, which, analyzing control strategy for power steering system based on control module, providing a new design thought and method for electric power steering system using MATLAB simulation analysis for steering dynamic features of electric power steering system and affects of road obstruction on steering system performance.

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