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 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.

Design of Fuzzy Logic-Based Controller in Roll Grinding System With Double Regenerative Chatter

2004 ◽  
Author(s):  
LiHong Yuan ◽  
V. M. Ja¨rvenpa¨a¨ ◽  
Erno Keskinen
Keyword(s):  
Numerical Simulation ◽  
Fuzzy Logic ◽  
Vibration Control ◽  
Fuzzy Logic Control ◽  
Control Method ◽  
Cutting Parameters ◽  
Regenerative Chatter ◽  
Logic Control ◽  
Grinding Machine ◽  
Grinding System

This paper proposes application of fuzzy logic control (FLC) to do vibration control for the roll-grinding machine system with double regenerative chatter. In this paper, a multiple-degree-of-freedom (MDOF) model is developed to represent the dynamics behaviors of this kind of system. The dynamic system has double delays and lumped cutting parameters which make vibration control challenging. Numerical simulation shows that FLC can dramatically reduce the vibration levels compared to a convention control method.

Electrospun Diameter Controllable Scheme Basing on Numerical Simulation

2011 ◽  
Vol 80-81 ◽  
pp. 737-741
Author(s):  
Yuan Yuan Liu ◽  
Chang Juan Jing ◽  
Qing Wei Li ◽  
Qiang Gao Wang ◽  
Qing Xi Hu
Keyword(s):  
Numerical Simulation ◽  
Control Method ◽  
Fiber Diameter ◽  
Cartilage Tissue Engineering ◽  
Large Degree ◽  
Transformation Model ◽  
Cartilage Tissue ◽  
Control Effect ◽  
Scaffold Degradation ◽  
Further Development

Electrospun nanofiber is widely used in cartilage tissue engineering to fabricate the replacement for the lost or damaged tissues and organs.The recent research has showed that the fiber diameter plays an important role in the scaffold degradation rate and growth rate of the planting cells,therefore whether the fiber diameter could be controllable or not is related to the further development of cartilage repairment engineering. For that sake,this paper suggested a control method basing on the finite element numerical simulation,which could be seen as an experiment plotform,furthermore the controller is trained according to the data collected from the model,and the control effect is examed and fixed as well.This method broke through the traditional type to exercise controllor that basing on identifide transformation model,it promotes the accuracy of the controllor to a large degree. After all,it is also an effective job to realize the flexible production and manufacturing of the equipments.

Secondary Development of Large-Scale Finite Element Software ABAQUS to Achieve the Numerical Simulation of Semi-Active Control

2014 ◽  
Vol 494-495 ◽  
pp. 1008-1011
Author(s):  
Guang Feng ◽  
Song Jian Sun
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Active Control ◽  
Large Scale ◽  
Control Method ◽  
Simulation Analysis ◽  
Numerical Procedure ◽  
Secondary Development ◽  
Control Effect ◽  
Finite Element Software

In the past, the semi-active control study generally is calculated based on the MATLAB numerical procedure, which cant achieve fine simulation. In this paper, to solve this problem, the finite element software ABAQUS is taken to be secondary development, a numerical simulation method of studying semi-active control is proposed. And the seismic response of a steel column is taken for the research. the numerical simulation analysis of the semi-active control is carried out. The results show that the control effect of the control method is significant, and the simulation result is clearly visible.

The Response Analysis and Vibration Control of Flexible Arms With Two Nonlinear Factors

2021 ◽  
Vol 13 (01) ◽  
pp. 2150005
Author(s):  
Guoliang Ma ◽  
Minglong Xu ◽  
Liqun Chen
Keyword(s):  
Dynamic Response ◽  
Vibration Control ◽  
Control Method ◽  
Dead Zone ◽  
Response Analysis ◽  
Beam Model ◽  
Control Effect ◽  
Vibration Equation ◽  
The Dead ◽  
Flexible Arms

The space flexible arm has the characteristics of large flexibility and size, and external excitation will cause harmful vibration. In this paper, the dynamic response of flexible arms is analyzed, and the vibration control is studied when nonlinear factors are considered. First, the vibration equation is established according to the Hamilton’s principle, and the generalized force is derived by using rod model and beam model, respectively. Then the Runge–Kutta method is used to solve the vibration equation, and the dynamic response is obtained. Finally, the PD and fuzzy control simulations of three arms are established, and the dead zone and saturation nonlinearities are applied in the programs. The numerical results show that the external force causes significant response, and the vibration control method is effective. Besides, in order to achieve vibration control effect, it is necessary to reduce the dead zone nonlinear range.

Vibration and Motion Control of Flexible Structures by Hybrid Dynamic Absorber(Influence of Vibration System with Nonlinear Element)

1994 ◽  
Vol 6 (3) ◽  
pp. 230-236
Author(s):  
Shinji Mitsuta ◽  
◽  
Kazuto Seto ◽  
Hiroyuki Ito ◽  
Akio Nagamatsu ◽  
...  
Keyword(s):  
Vibration Control ◽  
Motion Control ◽  
Control Method ◽  
Flexible Structures ◽  
Sine Wave ◽  
Flexible Structure ◽  
Control Force ◽  
Control Effect ◽  
Dynamic Absorber ◽  
Servo Controller

Recently, the necessity for making machines weighing less and operating at high speeds has increased. This paper is concerned with vibration and motion control by a control system which combines a servo controller and a hybrid dynamic absorber. In our method, vibration control and motion control are designed independently. First, the dynamics of a tower structure and a servo motor are modeled. Then, it is shown experimentally that although vibration control by the servo controller alone causes instability due to nonlinear elements such as friction or rattle, the hybrid dynamic absorber does not easily cause this sort of instability. On the comparison of vibration control effect and control force, the hybrid dynamic absorber requires less force. Finally, to know the effect of the new method, we evaluated the motions (triangular wave and sine wave) of the flexible structure. The effectiveness of this vibration and motion control method for the flexible structure was demonstrated by simulations and experiments.

Passive Vibration Control of Multi Buildings Connected With Hybrid Magnetorheological Damper

2007 ◽  
Author(s):  
Chinori Iio ◽  
Fadi Dohnal ◽  
Kazuto Seto ◽  
Toru Watanabe
Keyword(s):  
Vibration Control ◽  
Control Method ◽  
Good Control ◽  
Magnetorheological Damper ◽  
Control Effect ◽  
Passive Vibration Control ◽  
High Rise ◽  
Strong Winds ◽  
Bending Modes ◽  
Magneto Rheological

In this paper we propose a passive vibration control method for multiple high-rise buildings arranged in parallel. Using this method, it is possible to control vibrations of highrise buildings against strong winds and large earthquakes. In this study, two model buildings are connected with hybrid MR (Magneto-Rheological) damper. The objective of this research is to control the first and second bending modes of each building using the proposed method. The control effect is evaluated by exciting the base of the structures by time response and measuring the frequency response of the structures. Both simulation and experimental results show that fairly good control performance has been achieved by this method.

scholarly journals Vibration control method for a crawler-type combine harvester

2018 ◽  
pp. 873 ◽  
Author(s):  
Xueliang Zhang
Keyword(s):  
Vibration Control ◽  
Control Method ◽  
Design Method ◽  
Force Analysis ◽  
Control Effect ◽  
Combination Scheme ◽  
Combine Harvester ◽  
Combine Harvesters ◽  
Acting Force ◽  
Damping Model

The traditional vibration control method for the crawler-type combine harvester based on experience is only a small piece of weight iron added to the main drive shaft of the cutter,and the mass of the weight iron is determined by the technician with experience, so the vibration control effect is not obvious. Therefore, a vibration control method for the new crawler-type combined harvester is put forward in this paper. The engine and cutting structure are the main sources of the crawler-type combine. According to the force analysis results of the cutting structure and the results of structural dynamics analysis, each acting force and moment of force are obtained, and the optimal combination scheme for calculating the position and mass of weight distribution is calculated to solve the cutting structure’s vibration of the crawler-type combine harvester. According to the vibration theory and modern design method, the vibration control of the crawler-type combine harvester engine is realized through the model analysis and the finite element calculation to establish the vibration damping model and design the parameters of the damping cushion. The experimental results show that the proposed method can effectively improve the vibration status of crawler-type combine harvesters, and the vibration level of harvesters is reduced by 50% to 80% in field operation.

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