Vibration Control of a Rotating Cantilever Beam by Using the Giant Magnetostrictive Actuator

2017 ◽  
Author(s):  
Xueping Xu ◽  
Qinkai Han ◽  
Fulei Chu
Keyword(s):  
Cantilever Beam ◽  
Control Method ◽  
Dynamic Equations ◽  
Control Gain ◽  
Negative Feedback Control ◽  
Magnetostrictive Actuator ◽  
And Control ◽  
Control Methodology ◽  
Nonlinear Constitutive Relation

The dynamic model and control strategy of a rotating cantilever beam are investigated in the paper. The magnetostrictive layer is applied as the actuator and the nonlinear constitutive relation is analyzed. The kinetic energy and potential energy of the beam are obtained. The Hamilton method and Galerkin approach are adopted to obtain and disperse the dynamic equations, respectively. The negative feedback control methodology is used in the control system, which is performed by the solenoid coils. Numerical results show that the magnetostrictive control method is effective and plays the role of damping in the dynamic equations. The nonlinear constrictive characteristics of the magnetostrictive material can affect the control results deeply and should be paid enough attention. The magnetostrictive control performances are influenced by many parameters such as the bias magnetic field, control gain and pre-stress etc.

Experimental investigation of vibration attenuation on a cantilever beam using air-jet pulses with the particle swarm optimized quasi bang–bang controller

2020 ◽  
pp. 107754632097116
Author(s):  
Berkan Hizarci ◽  
Zeki Kiral
Keyword(s):  
Cantilever Beam ◽  
Control Method ◽  
Particle Swarm ◽  
Element Model ◽  
Lumped Mass ◽  
External Disturbances ◽  
Air Jet ◽  
Vibration Attenuation ◽  
Bang Bang Control ◽  
And Control

This study deals with the vibration reduction of a cantilever beam using air-jet thruster actuators controlled by the particle swarm optimized quasi bang–bang controller. In this study, the finite element model of a cantilever beam with the lumped mass of actuators is formed for the numerical simulations. Furthermore, the first-order plus dead time transfer function of the air-jet thruster actuator is found between the inlet pressure and the thrust. The quasi bang–bang control is proposed to suppress vibrations on the beam with impulsive air-jet pulses. The optimal location of the actuators and control parameters are determined with parametric study and particle swarm optimization, respectively. The performance of the control method is measured with the experiments of initial displacement, the presence of tip masses, and external disturbances. According to all results obtained in this study, it has been observed that the air-jet pulses successfully and rapidly attenuate vibration on the cantilever beam with the quasi bang–bang controller.

scholarly journals Implementation of Leader-Follower Formation Control of a Team of Nonholonomic Mobile Robots

2017 ◽  
Vol 12 (6) ◽  
pp. 871 ◽  
Author(s):  
Augie Widyotriatmo ◽  
Endra Joelianto ◽  
Agung Prasdianto ◽  
Hafidz Bahtiar ◽  
Yul Yunazwin Nazaruddin
Keyword(s):  
Mobile Robots ◽  
Formation Control ◽  
Control Method ◽  
Artificial Potential Field ◽  
Multiple Robots ◽  
Nonholonomic Mobile Robots ◽  
Role Assignment ◽  
Virtual Leader ◽  
And Control

A control method for a team of multiple mobile robots performing leader-follower formation by implementing computing, communication, and control technol-ogy is considered. The strategy expands the role of global coordinator system andcontrollers of multiple robots system. The global coordinator system creates no-collision trajectories of the virtual leader which is the virtual leader for all vehicles,sub-virtual leaders which are the virtual leader for pertinent followers, and virtualfollowers. The global coordinator system also implements role assignment algorithmto allocate the role of mobile robots in the formation. The controllers of the individualmobile robots have a task to track the assigned trajectories and also to avoid collisionamong the mobile robots using the artificial potential field algorithm. The proposedmethod is tested by experiments of three mobile robots performing leader-followerformation with the shape of a triangle. The experimental results show the robustnessof formation of mobile robots even if the leader is manually moved to the arbitrarylocation, and so that the role of a leader is taken by the nearest mobile robot to thevirtual leader.

scholarly journals Principle and Control of Active Engine Mount Based on Magnetostrictive Actuator

2020 ◽  
Author(s):  
Zhi-Yuan Si ◽  
Xianxu BAI ◽  
Li-Jun Qian ◽  
Peng Chen
Keyword(s):  
State Feedback ◽  
Vibration Isolation ◽  
Control Method ◽  
Reference Signal ◽  
Weight Vector ◽  
State Feedback Control ◽  
Lms Algorithm ◽  
Engine Mount ◽  
Magnetostrictive Actuator ◽  
And Control

Abstract The engine mount system affects the automobile NVH performance. Active mounts would achieve excellent vibration isolation and relative displacement control performance in a broad frequency bandwidth by outputting controlled force to the mounting system. The actuator and control method of the active mounts determine the system performance. In this paper, an active mount based on the smart material - Terfenol-D rod is proposed, which mainly includes three parts: rubber spring, magnetostrictive actuator (MA), and hydraulic amplification mechanism. Dynamic model of the active mount is correspondingly established. A state feedback control method based on x-LMS algorithm is proposed as well. Specifically, with the consideration of the unmeasurable state parameters in the active mounting system, an x-LMS state feedback controller with the system state as the reference signal is constructed by employing Sage-Husa Kalman filter to realize the state estimation of the active mounting system. Then a detailed analysis of the proposed control method is conducted, with deriving iterative formula of tap-weight vector. Sequentially, the problem of the dependence on the excitation signal in the x-LMS algorithm is addressed. The feasibility and capability of the proposed control method are verified and evaluated by simulation of a two-degree-of-freedom active mounting system.

Vibration suppression of a rotating cantilever beam under magnetic excitations by applying the magnetostrictive material

2018 ◽  
Vol 30 (4) ◽  
pp. 576-592 ◽  
Author(s):  
Xueping Xu ◽  
Qinkai Han ◽  
Fulei Chu ◽  
Robert G Parker
Keyword(s):  
Dynamic Model ◽  
Cantilever Beam ◽  
Vibration Suppression ◽  
Control Method ◽  
Dynamic Equations ◽  
Width Ratio ◽  
Energy Potential ◽  
Bending Vibration ◽  
Magnetic Excitations ◽  
Feedback Control Method

The dynamic model and vibration suppression of a rotating cantilever beam under magnetic excitations are investigated in this article. The nonlinear constitutive relation of magnetostrictive materials is presented. The layout of the control system is demonstrated and explained. The kinetic energy, potential energy of the system, and work done by the electromagnetic force are obtained. The dynamic equations of the system are obtained and discretized by the Hamilton principle and Galerkin approach, respectively. Based on the negative feedback control method, the control scheme is implemented by the magnetostrictive layer. The dynamic model and control method are validated by the references. Various parameter values of the magnetic excitations and rotating beam systems are investigated to reveal their effects on the control behaviors of the bending vibration. Results illustrate that the magnetic excitations bring negative stiffness in the system and increase the responses of beam greatly. The magnetostrictive suppression is effective and can be regarded as the damping effect in the dynamic equations. Increasing the control gain, bias magnetic field and width ratio of the magnetostrictive layer to the controlled layer are beneficial to the vibration control. However, enlarging the angular velocity and pre-stress is harmful to the vibration suppression.

Synchronization of chaotic Lur’e systems with time-delays via quantized output feedback control

2020 ◽  
pp. 014233122095086
Author(s):  
Yu Rao ◽  
Dongbing Tong ◽  
Qiaoyu Chen ◽  
Wuneng Zhou ◽  
Yuhua Xu
Keyword(s):  
Time Delays ◽  
Control Method ◽  
Output Feedback Control ◽  
Linear Matrix ◽  
Dynamic Parameters ◽  
Lur’E Systems ◽  
Control Gain ◽  
Chaotic Lur’E Systems ◽  
And Control ◽  
Asymptotic Synchronization

In this paper, the asymptotic stability for chaotic Lur’e systems (CLSs) is studied. A new control method, which involves both state quantizer and control quantizer, is presented. In addition, dynamic parameters of quantizers and controller are designed synchronously to ensure the asymptotic synchronization of the master–slave systems. Moreover, by solving linear matrix inequalities, the corresponding dynamic parameters and control gain can be given. Finally, one numerical simulation and two practical simulations are raised to prove the effectiveness of the control strategy.

Morphogenesis of a New Human Herpes-Type Virus Isolate (Sasha Virus)

1973 ◽  
Vol 31 ◽  
pp. 592-593
Author(s):  
R. F. Zeigel ◽  
W. Munyon
Keyword(s):  
Virus Isolate ◽  
Calf Serum ◽  
Uranyl Acetate ◽  
Human Herpes ◽  
Human Embryonic Lung ◽  
Human Herpes Virus ◽  
Intracytoplasmic Inclusions ◽  
Hel Cells ◽  
And Control

In continuing studies on the role of viruses in biochemical transformation, Dr. Munyon has succeeded in isolating a highly infectious human herpes virus. Fluids of buccal pustular lesions from Sasha Munyon (10 mo. old) uiere introduced into monolayer sheets of human embryonic lung (HEL) cell cultures propagated in Eagles’ medium containing 5% calf serum. After 18 hours the cells exhibited a dramatic C.P.E. (intranuclear vacuoles, peripheral patching of chromatin, intracytoplasmic inclusions). Control HEL cells failed to reflect similar changes. Infected and control HEL cells were scraped from plastic flasks at 18 hrs. of incubation and centrifuged at 1200 × g for 15 min. Resultant cell packs uiere fixed in Dalton's chrome osmium, and post-fixed in aqueous uranyl acetate. Figure 1 illustrates typical hexagonal herpes-type nucleocapsids within the intranuclear virogenic regions. The nucleocapsids are approximately 100 nm in diameter. Nuclear membrane “translocation” (budding) uias observed.

The role of copper ions in hydrogen peroxide bleaching: Their origin, removal, and effect on pulp quality

TAPPI Journal ◽  
2012 ◽  
Vol 11 (7) ◽  
pp. 37-46 ◽  
Author(s):  
PEDRO E.G. LOUREIRO ◽  
SANDRINE DUARTE ◽  
DMITRY V. EVTUGUIN ◽  
M. GRAÇA V.S. CARVALHO
Keyword(s):  
Hydrogen Peroxide ◽  
Copper Ions ◽  
Peroxide Bleaching ◽  
Metals Removal ◽  
Peroxide Decomposition ◽  
Equipment Corrosion ◽  
And Performance ◽  
And Control ◽  
Main Effects

This study puts particular emphasis on the role of copper ions in the performance of hydrogen peroxide bleaching (P-stage). Owing to their variable levels across the bleaching line due to washing filtrates, bleaching reagents, and equipment corrosion, these ions can play a major role in hydrogen peroxide decomposition and be detrimental to polysaccharide integrity. In this study, a Cu-contaminated D0(EOP)D1 prebleached pulp was subjected to an acidic washing (A-stage) or chelation (Q-stage) before the alkaline P-stage. The objective was to understand the isolated and combined role of copper ions in peroxide bleaching performance. By applying an experimental design, it was possible to identify the main effects of the pretreatment variables on the extent of metals removal and performance of the P-stage. The acid treatment was unsuccessful in terms of complete copper removal, magnesium preservation, and control of hydrogen peroxide consumption in the following P-stage. Increasing reaction temperature and time of the acidic A-stage improved the brightness stability of the D0(EOP)D1AP bleached pulp. The optimum conditions for chelation pretreatment to maximize the brightness gains obtained in the subsequent P-stage with the lowest peroxide consumption were 0.4% diethylenetriaminepentaacetic acid (DTPA), 80ºC, and 4.5 pH.

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