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.

scholarly journals Cooperative Control Method of Active and Semiactive Control: New Framework for Vibration Control

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Kazuhiko Hiramoto
Keyword(s):  
Vibration Control ◽  
Active Control ◽  
Cooperative Control ◽  
Control Method ◽  
Design Method ◽  
Control Object ◽  
Control Device ◽  
Semiactive Control ◽  
Control Input ◽  
Control Approach

A new control design framework for vibration control, the cooperative control of active and semiactive control, is proposed in the paper. In the cooperative control, a structural system having both of an actuator and a semiactive control device, for example, MR damper and so forth, is defined as the control object. In the proposed control approach, the higher control performance is aimed by the cooperative control between the active control with the actuator and the semiactive control with the semiactive control device. A design method to determine the active control input and the command signal to drive the semiactive control device based on the one-step prediction of the control output is proposed. A simulation example of a control system design for a benchmark building is presented to show the effectiveness of the proposed control framework.

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.

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 Fractional Critical Damping Theory and Its Application in Active Suspension Control

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Peng Wang ◽  
Qingyun Wang ◽  
Xiaomei Xu ◽  
Ning Chen
Keyword(s):  
Control Method ◽  
Design Method ◽  
Good Control ◽  
Existence Condition ◽  
Control Effect ◽  
Fractional Damping ◽  
Damping Control ◽  
Car Suspension ◽  
Special Cases ◽  
Critical Damping

In this paper, the existence condition of critical damping in 1 DOF systems with fractional damping is presented, and the relationship between critical damping coefficient and the order of the fractional derivative is derived. It shows only when the order of fractional damping and its coefficient meet certain conditions, the system is in the critical damping case. Then the vibration characteristics of the systems with different orders located in the critical damping set are discussed. Based on the results, the classical skyhook damping control strategy is extended to the fractional one, where a switching control law is designed to obtain a more ideal control effect. Based on the principle of modal coordinate transformation, a new design method of fractional skyhook damping control for full-car suspension is given. The simulation results show that the proposed control method has a good control effect, even in some special cases, such as roads bumps.

Research on Intelligent Soft Starting Method for Three-Phase Asynchronous Motor Based on MATLAB

2011 ◽  
Vol 299-300 ◽  
pp. 828-831
Author(s):  
Yan Feng Zhu
Keyword(s):  
Pid Control ◽  
Control Method ◽  
Design Method ◽  
Asynchronous Motor ◽  
Control Effect ◽  
Starting Current ◽  
Soft Starter ◽  
Three Phase ◽  
Adaptive Pid Control ◽  
Fuzzy Adaptive

Considering the very large direct starting current of three-phase asynchronous motor, this paper presents a design method of asynchronous motor soft starter based on a intelligent control- fuzzy adaptive PID control. The simulation model of the soft starting control system is established with the power system blockset in MATLAB/SIMULINK software. The simulation results show that the fuzzy adaptive PID control method can effectively limit the motor starting current and it is better than the control effect of traditional PID control. Therefore, the fuzzy adaptive PID control scheme presented in this paper is correct and feasible.

New control strategy for suppressing the local vibration of sandwich beams based on the wave propagation method

2021 ◽  
pp. 1045389X2110188
Author(s):  
Jun Xu ◽  
Yandong Chen ◽  
Yongpeng Tai ◽  
Guodong Shi ◽  
Ning Chen ◽  
...  
Keyword(s):  
Vibration Control ◽  
Control Strategy ◽  
Control Method ◽  
Flow Direction ◽  
Operating Conditions ◽  
Control Effect ◽  
Linear Quadratic ◽  
Local Vibration ◽  
Viscoelastic Composite ◽  
Wave Control

The general vibration control strategy of beam structures is a global vibration control method based on the principle of modal superposition. However, the vibration wave control of beams can achieve local control of the vibration energy. This paper presents a wave control method for the local vibration control of fractional viscoelastic composite beams based on the operating principle of a piezoelectric sheet. To obtain better control performance, a particle swarm optimization algorithm was adopted to optimize the parameters of the piezoelectric sheet. A linear quadratic regulator control algorithm was designed to verify the validity of the proposed method. In addition, the effects of the piezoelectric sheet number and fractional order on the amplitude response and optimization parameters were investigated. We observed that the proposed method has a good control effect on the local area vibration, and it can control the flow direction of the vibration power. The proposed method can be used to directly design the voltage and phase of a piezoelectric sheet without real-time feedback computation. This method is suitable for reducing local vibration under single repetitive operating conditions in engineering and can provide a theoretical basis for a follow-up study on the acoustic black hole phenomenon.

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.

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