Study on the Application of Damping Control Method in Multi-Solution Interval of the QZS System

2013 ◽  
Vol 457-458 ◽  
pp. 1017-1020
Author(s):  
Qing Chao Yang ◽  
Jing Jun Lou ◽  
Ai Min Diao
Keyword(s):  
Small Amplitude ◽  
Vibration Isolation ◽  
Control Method ◽  
Excitation Frequency ◽  
Main Idea ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Damping Control ◽  
Controlling System ◽  
Vibration Attenuation

The quasi-zero-stiffness system (QZS) is a nonlinear vibration isolation system, when the excitation frequency is in the multi-solution domain, the system may malfunctions in vibration attenuation. To solve this problem, the damping control method is introduced in this paper. The main idea is that the response on the resonance branch with large amplitude can switches to the non-resonance branch with small amplitude by controlling system damping, and it can stay on the non-resonance branch in the next process, which makes vibration isolation is also available in this interval. During this process, the Van den Pol plane is used to determine the time of which damping control can be withdrawn.

Analysis and Experiment of an Air Vibration Isolation System with Auxiliary Chambers

2012 ◽  
Vol 226-228 ◽  
pp. 195-198
Author(s):  
Rong Wei Wen ◽  
Jiu Bin Tan ◽  
Lei Wang ◽  
Guan Hua Wang
Keyword(s):  
Resonant Frequency ◽  
Vibration Isolation ◽  
Excitation Frequency ◽  
Volume Ratio ◽  
Air Spring ◽  
Working Pressure ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Vibration Transmissibility ◽  
System Vibration

A mathematical model of a single degree of freedom air spring vibration isolation system is established. The model analyzes the influence of structural damping in the air spring vibration isolation system based on the traditional model. This paper establishes the relationship between the working pressure p, the volume ratio of n and system vibration transmissibility T under forced vibration. The experimental results are verified on different working pressure. The results showed that working pressure p has little effect on the resonant frequency of the system and the system vibration transmissibility. The smaller the ratio n, the lower the resonant frequency of the system and the system vibration transmissibility. The environmental excitation frequency range must be taken into account in designing.

Feedforward Feedback Linearization Linear Quadratic Gaussian With Loop Transfer Recovery Control of Piezoelectric Actuator in Active Vibration Isolation System

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
Shuai Wang ◽  
Zhaobo Chen ◽  
Xiaoxiang Liu ◽  
Yinghou Jiao
Keyword(s):  
Vibration Control ◽  
Piezoelectric Actuator ◽  
Feedback Linearization ◽  
Vibration Isolation ◽  
Control Method ◽  
Linear Quadratic ◽  
Linear Quadratic Gaussian ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Loop Transfer Recovery

Hysteresis exists widely in intelligent materials, such as piezoelectric and giant magnetostrictive ones, and it significantly affects the precision of vibration control when a controlled object moves at a range of micrometers or even smaller. Many measures must be implemented to eliminate the influence of hysteresis. In this work, the hysteresis characteristic of a proposed piezoelectric actuator (PEA) is tested and modeled based on the adaptive neuro fuzzy inference system (ANFIS). A linearization control method with feedforward hysteresis compensation and proportional–integral–derivative (PID) feedback is established and simulated. A linear quadratic Gaussian with loop transfer recovery (LQG/LTR) regulator is then designed as a vibration controller. Verification experiments are conducted to evaluate the effectiveness of the control method in vibration isolation. Experiment results demonstrate that the proposed vibration control system with a feedforward feedback linearization controller and an LQG/LTR regulator can significantly improve the performance of a vibration isolation system in the frequency range of 5–200 Hz with low energy consumption.

On an Improvement of Hybrid Vibration Isolation System

1997 ◽  
Author(s):  
Kazuki Mizutani ◽  
Yoshitaka Fujita ◽  
Ryojun Ikeura
Keyword(s):  
Hybrid System ◽  
Vibration Isolation ◽  
Control Method ◽  
Weighting Function ◽  
Phase Lag ◽  
Frequency Range ◽  
Active System ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Isolation Performance

Abstract This paper proposes a hybrid-type vibration isolation system controlled by a phase compensated LQ control method with a frequency shaped weighting function. The hybrid system is composed of a passive spring-damper system reducing vibrations of high frequency range and an active one reducing those of low frequency range. This system is controlled by the phase compensated digital LQ optimization method with a frequency shaped weighting function. By the proposed method, the phase-lag of the control system is compensated so that the vibration isolation performance is improved. Simulations for the active system are carried out and the effectiveness of the phase compensation is shown. Then, experiments for the hybrid system are carried out for sinusoidal or random excitations. It is confirmed that the purposed hybrid system has the excellent isolation performance for excited vibrations over the wide frequency range.

Experimental Study of the Variable Stiffness Vibration Isolator

2011 ◽  
Vol 328-330 ◽  
pp. 2129-2133 ◽  
Author(s):  
Zhi Jun Shuai ◽  
Tie Jun Yang ◽  
Zhuo Liang Zhou ◽  
Zhi Gang Liu
Keyword(s):  
Natural Frequency ◽  
Vibration Isolation ◽  
Excitation Frequency ◽  
Low Frequency ◽  
Variable Stiffness ◽  
Resonance Problem ◽  
Vibration Isolator ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Passive Vibration Isolation

The traditional passive vibration isolation system can reduce the vibration transmission greatly while the excitation frequency is times higher than its natural frequency. As the external excitation approach its natural frequency, vibration isolator system is invalid. In this paper, a new variable stiffness vibration isolator was designed to solve the low-frequency resonance problem of the traditional isolator by combining toothed electromagnetic spring with passive isolator. Theoretical analysis and experimental results illustrate that this isolator met the design requirements and obtained the no resonance operating characteristic at the low frequency.

Hierarchical Intelligent Alignment Control of Air Spring Vibration Isolation System of Ship Propulsion Plant

2013 ◽  
Vol 419 ◽  
pp. 630-635
Author(s):  
Wen Jun Bu ◽  
Ying Long Zhao ◽  
Liang Shi
Keyword(s):  
Intelligent Control ◽  
Vibration Isolation ◽  
Control Method ◽  
Good Control ◽  
Air Spring ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Speed Test ◽  
And Control ◽  
Layer Control

Alignment control of propulsion plant air spring vibration isolation system is a complicated Multi objects control problem. In this paper a new hierarchical intelligent control method of alignment control is brought out. Known from current hierarchical intelligent control methods with three layers, this method consists of task layout layer, control decision-making layer, control layout layer and control executive layer. The complicated alignment control task is decomposed into four hierarchical layers to reduce complexity. The control system has good control convergence capability and fast convergence speed. Test results validate the feasibility of this method.

228 Active Damping Control on Vibration Isolation System of Centrifuge Rotor

2001 ◽  
Vol 2001.7 (0) ◽  
pp. 273-276
Author(s):  
Fumio OTSUKI ◽  
Hirohiko UEMATSU ◽  
Yasuhiro NAKAMURA ◽  
Yuichi CHIDA ◽  
Ryo FURUKAWA ◽  
...  
Keyword(s):  
Vibration Isolation ◽  
Active Damping ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Damping Control ◽  
Centrifuge Rotor ◽  
Active Damping Control

A Two-Stage Vibration Isolation System Featuring an Electrorheological Damper via the Semi-Active Static Output Feedback Variable Structure Control Method

2004 ◽  
Vol 10 (5) ◽  
pp. 683-706 ◽  
Author(s):  
Cai Liangbin ◽  
Chen Dayue
Keyword(s):  
Output Feedback ◽  
Vibration Isolation ◽  
Control Method ◽  
Sliding Mode ◽  
Static Output Feedback ◽  
External Disturbances ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Er Damper ◽  
Static Output

In this paper, we present a semi-active static output feedback variable structure control (VSC) strategy for vibration isolation. The control concept is based on the fact that, for a practical vibration isolation system subject to external disturbances, all state variables are hard to measure on-line and variations of system parameters frequently exist. A bypass electrorheological (ER) damper is designed and manufactured by incorporating a Bingham model of ER fluids. After the voltage-dependent damping characteristics of the ER damper are evaluated, the dynamic model of a two-stage vibration isolation system with one ER damper is derived. Using only the measured information from sensors installed at strategic locations, continuous output feedback VSC controllers are presented, which do not have possible chattering effects. The continuous control law is decoupled from external disturbances by combining controller design under a meeting sliding mode reachable condition with the choice of sliding surface gradient parameters under a guarantee of the Routh-Hurwitz stability of reduced-order sliding mode dynamics. The saturation of the actuator is also incorporated into the controller, showing no adverse effect. The self-adaptability of the vibration isolation system with respect to external disturbances, the robustness of the control method with respect to parameter variations and the effectiveness of vibration isolation are demonstrated by numerical simulation results in the frequency and time domains. It is illustrated that the performance of the presented semi-active static output feedback VSC system is superior to those of optimally passive damping and maximum damping variety even if system parameter uncertainties exist.

scholarly journals Vibration Control Method of an Electromagnetic Isolation System Based on LQR and Coevolutionary NGA

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Lei Zhang ◽  
Xiangtao Zhuan
Keyword(s):  
Genetic Algorithm ◽  
Steady State ◽  
Active Control ◽  
Vibration Isolation ◽  
Control Method ◽  
Linear Quadratic Regulator ◽  
State Equation ◽  
Linear Quadratic ◽  
Isolation System ◽  
Vibration Isolation System

An electromagnetic isolation system can dynamically adjust the output characteristic parameters of the system in real time through the active control strategy, which has strong adaptability to the external environment. In order to control the electromagnetic vibration isolation system effectively, an active control method is presented based on the linear quadratic regulator (LQR) approach and the coevolutionary niche genetic algorithm (NGA). In this paper, the dynamical equation and state equation of the electromagnetic isolation system are built, which include the nonlinear relationship between electromagnetic force and coil current and gap. The LQR approach is employed to maintain a steady state of an isolated object on the vibration isolation system. Meanwhile, a coevolutionary niche genetic algorithm is put forward to optimize the parameters in Q and R matrices. Simulation and experimental results demonstrate that the electromagnetic isolation system with the LQR approach and coevolutionary NGA can effectively isolate the vibration and maintain a steady state for an isolated object in comparison with the passive isolation system.

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