scholarly journals A Variable Parameter Ambient Vibration Control Method Based on Quasi-Zero Stiffness in Robotic Drilling Systems

Machines ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 67
Author(s):  
Laixi Zhang ◽  
Chenming Zhao ◽  
Feng Qian ◽  
Jaspreet Singh Dhupia ◽  
Mingliang Wu
Keyword(s):  
Vibration Control ◽  
Vibration Isolation ◽  
Control Method ◽  
Control Strategies ◽  
Equations Of Motion ◽  
Variable Parameter ◽  
Harmonic Balance Method ◽  
Variable Stiffness ◽  
Ambient Vibration ◽  
Robotic Drilling

Vibrations in the aircraft assembly building will affect the precision of the robotic drilling system. A variable stiffness and damping semiactive vibration control mechanism with quasi-zero stiffness characteristics is developed. The quasi-zero stiffness of the mechanism is realized by the parallel connection of four vertically arranged bearing springs and two symmetrical horizontally arranged negative stiffness elements. Firstly, the quasi-zero stiffness parameters of the mechanism at the static equilibrium position are obtained through analysis. Secondly, the harmonic balance method is used to deal with the differential equations of motion. The effects of every parameter on the displacement transmissibility are analyzed, and the variable parameter control strategies are proposed. Finally, the system responses of the passive and semiactive vibration isolation mechanisms to the segmental variable frequency excitations are compared through virtual prototype experiments. The results show that the frequency range of vibration isolation is widened, and the stability of the vibration control system is effectively improved without resonance through the semiactive vibration control method. It is of innovative significance for ambient vibration control in robotic drilling systems.

Proacustica Handbook: noise and vibration control in building installations

2021 ◽  
Vol 263 (1) ◽  
pp. 5057-5062
Author(s):  
Jose Nepomuceno ◽  
Priscila Wunderlich
Keyword(s):  
Vibration Control ◽  
Vibration Isolation ◽  
Control Strategies ◽  
Room Acoustics ◽  
Noise And Vibration ◽  
Technical Content ◽  
Working Groups ◽  
Environmental Acoustics ◽  
The Subject ◽  
The Moment

Proacústica is a nonprofit entity created in 2010 to congregate companies and professionals willing to leverage the development of acoustics in Brazil. Three technical committees (TCs): Environmental Acoustics, Building Acoustics, and Room Acoustics, contribute to the drafting of laws, standards, production of technical content, and integration between different players of the market. By 2021, the Room Acoustics TC incorporated three Working Groups: Special Rooms, Schools and Noise Control and Vibration Control - the last one dedicated to the Proacustica Handbook: Noise and Vibration Control In Building Installations. The purpose of this publication is to describe the step-by-step measures to implement noise and vibration control strategies in buildings. These strategies are aimed at the particularities of the Brazilian market at the moment and also a way to improve how M/E/P equipment manufacturers, installers, designers, and acoustic consultants approach the subject from the design to the construction, Important technical discussions among participants included: the use of sound pressure versus sound power data for equipment; the sound rating for diffusers, VAVs, and other ductwork devices; vibration isolation guidelines, among other topics. This paper presents the Handbook structure, relevant discussions, and recommendations to be published as a final document by the end of 2021.

Response Control of Variable Stiffness Structure Using Electromagnetic Clutch

2003 ◽  
Vol 7 (2) ◽  
pp. 101-107
Author(s):  
Toshihiro Irie ◽  
◽  
Kiyoshi Shingu ◽  
Keita Kitamura ◽  
Yoshihiro Takagi ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Vibration Control ◽  
Control Method ◽  
Variable Stiffness ◽  
Control Effect ◽  
Response Control ◽  
Electromagnetic Clutch

Vibration control method of a variable stiffness structure using an electromagnetic clutch is shown. The control effect is predicted by numerical simulation. On the basis of this result, an experiment is carried out using an actual apparatus to confirm the effect of the variable stiffness structure using the electromagnetic clutch.

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.

Diagonal Recurrent Neural Networks for MDOF Structural Vibration Control

2008 ◽  
Vol 130 (6) ◽  
Author(s):  
Z. Q. Gu ◽  
S. O. Oyadiji
Keyword(s):  
Vibration Control ◽  
Control Method ◽  
Control Strategies ◽  
Linear Quadratic Regulator ◽  
Pole Placement ◽  
Structural Vibration ◽  
Stability And Convergence ◽  
Northridge Earthquake ◽  
Linear Quadratic ◽  
Structural Vibration Control

In recent years, considerable attention has been paid to the development of theories and applications associated with structural vibration control. Integrating the nonlinear mapping ability with the dynamic evolution capability, diagonal recurrent neural network (DRNN) meets the needs of the demanding control requirements in increasingly complex dynamic systems because of its simple and recurrent architecture. This paper presents numerical studies of multiple degree-of-freedom (MDOF) structural vibration control based on the approach of the backpropagation algorithm to the DRNN control method. The controller’s stability and convergence and comparisons of the DRNN method with conventional control strategies are also examined. The numerical simulations show that the structural vibration responses of linear and nonlinear MDOF structures are reduced by between 78% and 86%, and between 52% and 80%, respectively, when they are subjected to El Centro, Kobe, Hachinohe, and Northridge earthquake processes. The numerical simulation shows that the DRNN method outperforms conventional control strategies, which include linear quadratic regulator (LQR), linear quadratic Gaussian (LQG) (based on the acceleration feedback), and pole placement by between 20% and 30% in the case of linear MDOF structures. For nonlinear MDOF structures, in which the conventional controllers are ineffective, the DRNN controller is still effective. However, the level of reduction of the structural vibration response of nonlinear MDOF structures achievable is reduced by about 20% in comparison to the reductions achievable with linear MDOF structures.

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.

A Study on Active Engine Vibration Control by Applying Hydraulic-Piezoelectric Mount

2013 ◽  
Vol 721 ◽  
pp. 501-504
Author(s):  
Hang Xu Yang ◽  
Rui Min Wang ◽  
Dong Mei Liu
Keyword(s):  
Quality Improvement ◽  
Vibration Control ◽  
Vibration Isolation ◽  
Control Method ◽  
Vertical Vibration ◽  
Ride Quality ◽  
Disc Membrane ◽  
Engine Vibration ◽  
Engine Mount ◽  
Active Engine

Study of LMS control method on active engine mount is carried out for ride quality improvement. Take an active engine mount which is based and developed from a hydraulic mount with decoupled disc-membrane as a module, the characteristic of vibration isolation of active engine mount is simulated and analyzed. The results indicated that active engine mount could reduce the vertical vibration effectively with LMS Control method.

scholarly journals Multiple-TMD-Based Structural Vibration Control for Pumped Storage Power Plants

2020 ◽  
Vol 10 (16) ◽  
pp. 5577
Author(s):  
Tengfei Zhong ◽  
Xin Feng ◽  
Yu Zhang ◽  
Jing Zhou
Keyword(s):  
Vibration Control ◽  
High Frequency ◽  
Power Plants ◽  
Control Method ◽  
Control Strategies ◽  
High Order Mode ◽  
Structural Vibration ◽  
Power Station ◽  
High Frequency Vibration ◽  
Pumped Storage

The high-frequency resonance in the superstructure of a pumped storage power station (PSPP) due to the generation unit can shorten the service life of the power station structure and even endanger its safety. Although tuned mass dampers (TMDs) have been proved to be effective in controlling structural vibration, their application in PSPPs is rare, as high-frequency vibration control of PSPPs has not been studied. In this paper, a TMD control method is proposed based on PSPP high-frequency vibration and various TMD control strategies, and a set of high-frequency TMD equipment is designed. Results of a series of vibration reduction tests and numerical analyses show that the new TMD device can effectively control the high-order mode of the structure, and the bandwidth of the suppression frequency is extended, which shows the robustness and control efficiency of the device.

Vibration Control of the Flexible Robotic Arm through Modal Interaction

2014 ◽  
Vol 490-491 ◽  
pp. 1142-1145
Author(s):  
Zhi Hui Gao ◽  
Bing Dong Liu ◽  
Bo Shan
Keyword(s):  
Vibration Control ◽  
Control Method ◽  
Perturbation Technique ◽  
Equations Of Motion ◽  
Rigid Motion ◽  
Robotic Arm ◽  
Vibration Absorber ◽  
Modal Interaction ◽  
Flexible Arm ◽  
Nonlinear Equations Of Motion

A vibration control method is proposed to suppress nonlinear large vibration of the flexible robotic arm undergoing rigid motion. The method takes advantage of modal interaction and is implemented based on internal resonance. To attenuate vibration of the flexible arm, another vibrating system, consisting of a rigid link, a flexible joint and a damper, is introduced as a vibration absorber. Perturbation technique is used to study the transient response of the nonlinear equations of motion. Numerical simulation results preliminarily verify that the proposed control strategy is able to effectively reduce vibration of the flexible robotic arm.

Robust adaptive vibration control of an underactuated flexible spacecraft

2018 ◽  
Vol 25 (4) ◽  
pp. 834-850 ◽  
Author(s):  
H. MoradiMaryamnegari ◽  
A.M. Khoshnood
Keyword(s):  
Rigid Body ◽  
Vibration Control ◽  
Control Method ◽  
Frequency Estimation ◽  
Equations Of Motion ◽  
Rigid Bodies ◽  
Lagrange Equations ◽  
Flexible Bodies ◽  
Robust Adaptive ◽  
Adaptive Vibration Control

Designing a controller for multi-body systems including flexible and rigid bodies has always been one of the major engineering challenges. Equations of motion of these systems comprise extremely nonlinear and coupled terms. Vibrations of flexible bodies affect sensors of rigid bodies and might make the system unstable. Introducing a new control strategy for designing control systems which do not require the rigid–flexible coupling model and can dwindle vibrations without sensors or actuators on flexible bodies is the purpose of this paper. In this study, a spacecraft comprising a rigid body and a flexible panel is used as the case study, and its equations of motion are extracted using Lagrange equations in terms of quasi-coordinates. For oscillations on a rigid body to be eliminated, a frequency estimation algorithm and an adaptive filtering are used. A controller is designed based on the rigid model of the system, and then robust stability conditions for the rigid–flexible system are obtained. The conditions are also developed for the spacecraft with more than one active frequency. Finally, the robust adaptive vibration control system is simulated in the presence of resonance. Simulations’ results indicate the advantage of the control method even when several active frequencies simultaneously resonate the dynamics system.

Vibration Control by Using Piezostack Based Mount

2015 ◽  
Vol 738-739 ◽  
pp. 180-183
Author(s):  
Cheng Xun Cui
Keyword(s):  
Control System ◽  
Vibration Control ◽  
Control Method ◽  
Equations Of Motion ◽  
Mass Loading ◽  
Governing Equations ◽  
Specific Mass ◽  
Passive Element ◽  
Feedforward Controller ◽  
Force Characteristics

A vibration control method by using an active hybrid mount featuring piezostack actuators was indicated in this paper. The hybrid mount is composed of piezostack as an active actuator and rubber as a passive element. The hybrid mount was designed and manufactured after experimentally identifying actuating force characteristics of the piezostack and dynamic characteristics of the rubber. Then , a vibration control system with a specific mass loading is constructed, and its governing equations of motion are derived. A feedforward controller is formulated and experimentally realized, in order to actively attenuate vibration transmitted from the base. Finally, vibration control responses are evaluated.

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