scholarly journals Improving Vehicle Ride and Handling Using LQG CNF Fusion Control Strategy for an Active Antiroll Bar System

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
N. Zulkarnain ◽  
H. Zamzuri ◽  
Y. M. Sam ◽  
S. A. Mazlan ◽  
S. M. H. F. Zainal
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Control Strategies ◽  
Linear Feedback ◽  
Nonlinear Feedback ◽  
Handling Performance ◽  
Car Model ◽  
Initial Stage ◽  
System Output ◽  
Ride And Handling

This paper analyses a comparison of performance for an active antiroll bar (ARB) system using two types of control strategy. First of all, the LQG control strategy is investigated and then a novel LQG CNF fusion control method is developed to improve the performances on vehicle ride and handling for an active antiroll bar system. However, the ARB system has to balance the trade-off between ride and handling performance, where the CNF consists of a linear feedback law and a nonlinear feedback law. Typically, the linear feedback is designed to yield a quick response at the initial stage, while the nonlinear feedback law is used to smooth out overshoots in the system output when it approaches the target reference. The half car model is combined with a linear single track model with roll dynamics which are used for the analysis and simulation of ride and handling. The performances of the control strategies are compared and the simulation results show the LQG CNF fusion improves the performances in vehicle ride and handling.

scholarly journals Pressure Control of Insulation Space for Liquefied Natural Gas Carrier with Nonlinear Feedback Technique

2018 ◽  
Vol 6 (4) ◽  
pp. 133
Author(s):  
Jinghua Cao ◽  
Xianku Zhang ◽  
Xiang Zou
Keyword(s):  
Natural Gas ◽  
Control Strategy ◽  
Control Strategies ◽  
Nonlinear Function ◽  
Pressure Control ◽  
Feedback Signal ◽  
Control Input ◽  
Nonlinear Feedback ◽  
Pressure Control System ◽  
Liquid Natural Gas

This paper introduces a novel control strategy into the insulation space for liquid natural gas carriers. The control strategy proposed can improve the effects of control for differential pressure and reduce the energy consumption of nitrogen. The method combines a nonlinear feedback technique with a closed-loop gain shaping algorithm (CGSA). It is designed for the pressure control system which is vital for liquid natural gas carriers (LNGCs) in marine transportation. The control error is modulated using nonlinear function. The deviation signal is replaced with a nonlinear feedback signal. Comparison experiments are conducted under different conditions to prove the effectiveness of this strategy. This paper compares three control strategies: a control strategy with nonlinear feedback based on CGSA, a control strategy without nonlinear feedback based on CGSA, and a two-degree-of-freedom (DOF) control strategy. The simulation results show that this control strategy with nonlinear feedback performs better than the other two. The average reduction of control input is about 38.8%. The effect of pressure control is satisfactory.

Wheel Synchronization Control in Steer-by-Wire Using Composite Nonlinear Feedback

2014 ◽  
Vol 575 ◽  
pp. 762-765 ◽  
Author(s):  
Sarah Atifah Saruchi ◽  
Hairi Zamzuri ◽  
Saiful Amri Mazlan ◽  
Sheikh Muhammad Hafiz Fahami ◽  
Noraishikin Zulkarnain
Keyword(s):  
Control Strategy ◽  
Front Wheel ◽  
Linear Feedback ◽  
Steering Wheel ◽  
Nonlinear Feedback ◽  
Composite Nonlinear Feedback ◽  
Control Laws ◽  
Simulation Based ◽  
Steer By Wire ◽  
Rising Time

This paper proposes a new control strategy to ensure the steering wheel and front wheel synchronization in Steer-by-Wire (SBW) using a Composite Nonlinear Feedback (CNF) controller. CNF is a combination of linear and non-linear feedback control laws. This controller is designed in order to minimize the delay in settling time, achieve fast rising time and lower the overshoot for the front wheel response. A simulation based on this control strategy was made and compared to analyze the system performance.

scholarly journals Overlapping Decentralized Control Strategies of Building Structures’ Vibration with Time Delay Based on H∞ Control Algorithms under Seismic Excitation

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Xiaofang Kang ◽  
Jian Wu ◽  
Yewei Zhang ◽  
Guoliang Liu ◽  
Suhui Zhang ◽  
...  
Keyword(s):  
Control System ◽  
Time Delay ◽  
Vibration Control ◽  
Decentralized Control ◽  
Control Strategy ◽  
Control Algorithm ◽  
Control Method ◽  
Control Strategies ◽  
Linear Matrix ◽  
Feedback Gain

A decentralized control strategy can effectively solve the control problem of the large-scale time delayed structures. In this paper, combining the overlapping decentralized control method, linear matrix inequality (LMI) method, and H∞ control algorithm, overlapping decentralized H∞ control approach of the time delayed structures has been established. The feedback gain matrixes of all subsystems are obtained by this method based on genetic algorithm optimization tools and the specific goal of optimization control. The whole vibration control system of the time delayed structures is divided into a series of overlapping subsystems by overlapping decentralized control strategy. The feedback gain matrixes of each subsystem can be obtained by using H∞ control algorithm to calculate each subsystem. The vibration control of a twenty layers’ antiseismic steel structure Benchmark model was analyzed with the numerical method. The results show that the proposed method can be applied to control system with time delay. The overlapping decentralized control strategies acquire the similar control effects with that of the centralized control strategy. Moreover, the flexibility of the controller design has been enhanced by using overlapping decentralized control strategies.

scholarly journals Research on Virtual Inductive Control Strategy for Direct Current Microgrid with Constant Power Loads

2019 ◽  
Vol 9 (20) ◽  
pp. 4449 ◽  
Author(s):  
Zhiping Cheng ◽  
Meng Gong ◽  
Jinfeng Gao ◽  
Zhongwen Li ◽  
Jikai Si
Keyword(s):  
Transmission Line ◽  
Direct Current ◽  
Control Strategy ◽  
Control Method ◽  
Control Strategies ◽  
Performance Comparison ◽  
Distributed Resources ◽  
Constant Power ◽  
Dc Microgrid ◽  
Constant Power Loads

In order to improve the stability of direct current (DC) microgrid with constant power loads, a novel virtual inductive approach is proposed in this paper. It is known that the negative impedance characteristic of constant power loads will lead to DC bus voltage fluctuation, which will be more serious when they integrate into the DC microgrid though a large transmission line inductive. For the convenience of analysis, a simplified circuit model of the system is obtained by modeling the distributed resources. Unlike the existing control strategies, the proposed control strategy constructs a negative inductance link, which helps to counteract the negative effects of the line inductive between the power source and the transmission line. Detailed performance comparison of the proposed control and virtual capacitance are implemented through MATLAB/simulink simulation. Moreover, the improved performance of the proposed control method has been further validated with several detailed studies. The results demonstrate the feasibility and superiority of the proposed strategy.

Dynamic responses and control of geared transmission system based on multibody modeling methodology

2022 ◽  
pp. 107754632110495
Author(s):  
ZhaoYuan Yao ◽  
JunGuo Wang ◽  
YongXiang Zhao
Keyword(s):  
Control Method ◽  
Control Strategies ◽  
Joint Stiffness ◽  
Transmission System ◽  
Dynamic Responses ◽  
Linear Feedback ◽  
Friction Damper ◽  
Multibody Modeling ◽  
Modeling Methodology ◽  
Bearing System

In this study, an innovative modeling approach is put forward to research the effect of eccentricity on the nonlinear dynamical behaviors of geared-bearing system. This refined model contains the rigid body of the rotor-bearing system and separated gear teeth which are considered as individual bodies elastically attached to the gear hub with revolute joints. The internal and external excitations of the proposed model include torsional joint stiffness, roll bearing forces, friction between gear pair, gear eccentricity, and so on. The systematic procedure for the calculation of torsional joint stiffness, bearing forces and friction coefficient considering elastohydrodynamic is also conducted. After that, the influence of eccentricity on nonlinear dynamic characteristics of the geared transmission system is analyzed. To avoid the system moving in the unstable motion state, a dry friction damper controller is designed to control the nonlinear behaviors simulated on the basis of above model. The linear feedback and periodic excitation non-feedback control strategies are, respectively, selected to design the actuator. It is indicated that undesirable behaviors of the geared transmission system can be avoided effectively by applying the proposed control method.

scholarly journals Linear Feedback Synchronization Used in the Three-Dimensional Duffing System

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Jian-qun Han ◽  
Xu-dong Shi ◽  
Hong Sun
Keyword(s):  
Feedback Control ◽  
Chaotic System ◽  
Control Method ◽  
Three Dimensional ◽  
Lyapunov Stability Theory ◽  
Linear Feedback ◽  
Nonlinear Feedback ◽  
Linear Feedback Control ◽  
Duffing System ◽  
Feedback Control Method

It has been realized that synchronization using linear feedback control method is efficient compared to nonlinear feedback control method due to the less computational complexity and the synchronization error. For the problem of feedback synchronization of Duffing chaotic system, in the paper, we firstly established three-dimensional Duffing system by method of variable decomposition and, then, studied the synchronization of Duffing chaotic system and designed the control law based on linear feedback control and Lyapunov stability theory. It is proved theoretically that the two identical integer order chaotic systems are synchronized analytically and numerically.

PLC-Based Embedded Intelligent Control Research

2015 ◽  
Vol 799-800 ◽  
pp. 1127-1131
Author(s):  
Wen Chong Cui ◽  
Yu Lin Dong
Keyword(s):  
Intelligent Control ◽  
Control Strategy ◽  
Control Method ◽  
Control Strategies ◽  
Rapid Development ◽  
Control Effect ◽  
Industrial Control ◽  
Expert Control ◽  
Control Research ◽  
Traditional Process

With the rapid development of industrialization, the intelligent control has increasingly replaced the traditional process control in PLC in recent years, in which some intelligent control strategy has been applied to industrial control cases, such as genetic algorithm, fuzzy control, expert control and neural network and so on. However, it is not sufficient to achieve the desired control effect if only an intelligent control method is applied in the intelligent control. Therefore, integrated intelligent control of various control strategies is bound to be a focus in the embedded intelligent control. At the same time, with growing power of the PLC processing, it is possible for complex algorithms to be used in the embedded application, which has great significance in the development of industrialization as well as intelligent control.

Generator-Side Converter Control Strategies of Synchronous Wind Turbines Based on the MPPT

2014 ◽  
Vol 1070-1072 ◽  
pp. 238-242
Author(s):  
Cong Chen ◽  
Hui Liu ◽  
Shu Shan Li ◽  
Shao Jie Gao
Keyword(s):  
Wind Speed ◽  
Control Strategy ◽  
Control Method ◽  
Control Strategies ◽  
Frequency Control ◽  
Response Speed ◽  
Hill Climbing ◽  
Constant Frequency ◽  
Variable Speed Constant Frequency ◽  
Measured Wind Speed

Traditional wind turbine converter uses wind speed sensors to measure wind speed as a control conditioning signal, but it makes the measured wind speed have some delay, which affecting the response speed of motor control.For this purpose this paper presents a new control strategy of synchronous permanent magnet wind generator-side converter.By using the combination of hill-climbing searching algorithm and synchronous motor vector control of decoupling to realize the maximum wind capture and variable speed constant frequency control. The simulation results validate the rapidity and feasibility of the control method. And it shows that the control strategy can be quickly and accurately to achieve control objectives. It also omits wind speed measuring sensor and reduces cost compared with traditional control strategy.

Based the Active Defense Substation Domain Strategy Control Method to against Blackout

2014 ◽  
Vol 1070-1072 ◽  
pp. 687-692
Author(s):  
Qing Wei Zhang ◽  
Sheng Yang ◽  
Ying Dai
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Control Strategies ◽  
Stability Control ◽  
Simulation Software ◽  
System Stability ◽  
Active Defense ◽  
Real Time Analysis ◽  
Strategy Control ◽  
Building Program

In the previous blackout, overload components out of operation often leaded to the expansion of the accident. One active defense substation domain strategy control system was proposed to prevent the N-1 contingencies to N-2 contingencies caused blackout. Through the substation elements states real time analysis , the active defense control strategy was created by learn from the principles and action messages of backup switching equipment, protection and automatic stability control devices. In order to keep the overall system stability, the active defense control strategy was completed by actively put in the standby element or quit part of the overload elements, to make the system into a new equilibrium state. Contrasting these control strategies by PSCAD/EMTDC simulation software, the results presented that this strategy could quickly change the “Close to collapse” zone into the stability states and the building program simple and practical.

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