Results of Vibration Control of a Maglev Vehicle Utilizing a Linear Generator

2005 ◽  
Author(s):  
Erimitsu Suzuki ◽  
Ken Watanabe
Keyword(s):  
Vibration Control ◽  
Ride Comfort ◽  
Linear Quadratic ◽  
Damping Force ◽  
Generator System ◽  
High Frequencies ◽  
Linear Generator ◽  
Maglev Vehicle ◽  
Secondary Suspension ◽  
Lq Control

To make the superconducting magnetically levitated transport (maglev) system more attractive, it has been important to enhance the ride comfort by controlling vehicle vibration. Maglev vehicle vibrations have been reduced in previous experiments by controlling only the secondary suspension between the car bodies and bogies. However, by doing so, it has been difficult to reduce vibration for the characteristic and relatively high frequencies of the primary suspension between the bogies and guideway. Recently, control of the primary suspension is being considered. Power collecting coils of a linear generator system, which is being tested as an onboard power source, can also generate additional forces that can be used to control vibrations. Because this type of vibration control can apply damping directly to the primary suspension, it can reduce vibrations of relatively higher frequencies that are difficult to reduce by controlling only the secondary suspension. A maglev vehicle model that focuses on vertical and pitching motions is used to examine the effectiveness of reducing vibrations by using a linear generator damping force control in the primary suspension and linear quadratic (LQ) control of the actuators in the secondary suspension. Experimental results using the linear generator on a full-scale maglev vehicle on the Yamanashi Maglev Test Line are described.

Control and Response Characteristics of a Mixed Mode MR Damper for a Multi-Story Structure

2013 ◽  
Vol 284-287 ◽  
pp. 1778-1782
Author(s):  
Kum Gil Sung
Keyword(s):  
Vibration Control ◽  
Mixed Mode ◽  
Excitation Frequency ◽  
Mr Damper ◽  
Linear Quadratic Regulator ◽  
Relative Displacement ◽  
Linear Quadratic ◽  
Damping Force ◽  
Story Structure ◽  
Mr Fluid

This paper presents vibration control responses of a multi-story structure installed with a semi-active magneto-rheological(MR) damper. As a first step, performance characteristics of three different working modes for MR fluid are compared and the mixed mode type of MR damper is chosen as an optimal candidate for the vibration control of the multi-story structure. An appropriate size of the mixed mode MR damper is devised and manufactured on the basis of the field-dependent Bingham model of the MR fluid which is commercially available. The damping force of the mixed mode MR damper is evaluated with respect to the excitation frequency at various magnetic fields. After formulating the governing equation of motion for the small scaled three-story structure associated with the MR damper, the linear quadratic regulator(LQR) controller to effectively suppress unwanted structural vibrations is designed by imposing semi-active actuating conditions. The control algorithm is then empirically implemented under earthquake conditions and the control responses of the horizontal relative displacement and acceleration are evaluated in time and frequency domains through computer simulations.

Road traveling test for vibration control of a wheel loader cabin installed with magnetorheological mounts

2020 ◽  
pp. 1045389X2095390
Author(s):  
Seong-Hwan Kim ◽  
Dal-Seong Yoon ◽  
Gi-Woo Kim ◽  
Seung-Bok Choi ◽  
Jin-Young Jeong ◽  
...  
Keyword(s):  
Vibration Control ◽  
Field Test ◽  
Ride Comfort ◽  
Dynamic Stiffness ◽  
Wide Frequency Range ◽  
Vehicle Speed ◽  
Damping Force ◽  
Wheel Loader ◽  
Vehicle Cabin ◽  
Low Elastic Modulus

This paper presents a semi-active type magnetorheological (MR) fluid-based mount for effective vibration control of a wheel loader cabin. Traditional passive (viscous) mounts are inadequate at providing a large damping force and low elastic modulus over a wide frequency range; hence, the ride comfort of the driver and work efficiency per day are limited. In the present study, to overcome this limitation, MR mounts were designed considering principal geometry and dimensions of existing viscous mounts and installed to a vehicle cabin for vibration control. After investigating the field-dependent dynamic stiffness of the manufactured MR mounts, a field test on road traveling was conducted. In the field test, vibrations from the vertical and horizontal directions are evaluated with respect to the vehicle speed. In addition, vibration control performances between conventional viscous mount and the proposed MR mounts were compared showing superior performances of the reduced acceleration transmissibility and amplitude with on-off controlled MR mounts.

scholarly journals Applications of Approximate Optimal Control to Nonlinear Systems of Tracked Vehicle Suspensions

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Yan-Jun Liang ◽  
You-Jun Lu ◽  
De-Xin Gao ◽  
Zhong-Sheng Wang
Keyword(s):  
Optimal Control ◽  
Vibration Control ◽  
Ride Comfort ◽  
Nonlinear Dynamic System ◽  
Active Suspension ◽  
Nonlinear Damping ◽  
Tracked Vehicle ◽  
Control Approach ◽  
Vehicle Suspensions ◽  
Suspension Systems

AbstractTechnique of approximate optimal vibration control and simulation for vehicle active suspension systems are developed. Considered the nonlinear damping of springs, mechanical model and a nonlinear dynamic system for a class of tracked vehicle suspension vibration control are established and the corresponding system of state space form is described. To prolong the working life of suspension system and improve ride comfort, based on the active suspension vibration control devices and using optimal control approach, an approximate optimal vibration controller is designed, and an algorithm is presented for the vibration controller. Numerical simulation results illustrate the effectiveness of the proposed technique.

Improvement on Ride Comfort of Quarter-Car Active Suspension System Using Linear Quadratic Regulator

2018 ◽  
pp. 431-441
Author(s):  
Sharifah Munawwarah Syed Mohd Putra ◽  
Fitri Yakub ◽  
Mohamed Sukri Mat Ali ◽  
Noor Fawazi Mohd Noor Rudin ◽  
Zainudin A. Rasid ◽  
...  
Keyword(s):  
Ride Comfort ◽  
Linear Quadratic Regulator ◽  
Active Suspension ◽  
Suspension System ◽  
Linear Quadratic ◽  
Quarter Car

Active Vibration Control of a Triple Flexible Structures Combined With Actuators

1995 ◽  
Author(s):  
Kazuto Seto ◽  
Yoshihiro Toba ◽  
Fumio Doi
Keyword(s):  
Vibration Control ◽  
Large Scale ◽  
Active Vibration Control ◽  
Flexible Structures ◽  
Low Frequency ◽  
Tall Buildings ◽  
Control Force ◽  
Active Vibration ◽  
Strong Winds ◽  
Lq Control

Abstract In order to realize living comfort of tall buildings by reducing the vibration of higher floors by strong winds, this paper proposes a new method of vibration control for flexible structures with a large scale. The higher a tall building the lower its natural frequency. Since obtaining sufficient force to control the lower frequency vibrations of tall buildings is a difficult task, controlling the vibration of ultra-tall buildings using active dynamic absorbers is nearly impossible. This problem can be overcome by placing actuators between a pair of two or three ultra-tall buildings and using the vibrational force of each building to offset the vibrational movement of its paired mate. Therefore, it is able to obtain enough control force under the low frequency when the proposed method is used. In this paper, a reduced-order model expressed by 2DOF system under taking into consideration for preventing spillover instability is applied to control each flexible structure. The LQ control theory is applied to the design of such a control system. The effectiveness of this method is demonstrated theoretically as well as experimentally.

Dynamic Analysis of Steering Bogies

2016 ◽  
pp. 524-579 ◽  
Author(s):  
Arun K. Samantaray ◽  
Smitirupa Pradhan
Keyword(s):  
High Speed ◽  
Ride Comfort ◽  
Lateral Force ◽  
Rolling Stock ◽  
Wheel Wear ◽  
Active Steering ◽  
Load Fluctuation ◽  
Speed Up ◽  
Turning Radius ◽  
Secondary Suspension

Running times of high-speed rolling stock can be reduced by increasing running speed on curved portions of the track. During curving, flange contact causes large lateral force, high frequency noises, flange wears and wheel load fluctuation at transition curves. To avoid derailment and hunting, and to improve ride comfort, i.e., to improve the curving performances at high speed, forced/active steering bogie design is studied in this chapter. The actively steered bogie is able to negotiate cant excess and deficiency. The bogie performance is studied on flexible irregular track with various levels of cant and wheel wear. The bogie and coach assembly models are developed in Adams VI-Rail software. This design can achieve operating speed up to 360 km/h on standard gauge ballasted track with 150mm super-elevation, 4km turning radius and 460m clothoid type entry curve design. The key features of the designed bogie are the graded circular wheel profiles, air-spring secondary suspension, chevron springs in the primary suspension, anti-yaw and lateral dampers, and the steering linkages.

A Controllability-Based TO Approach for the Piezoelectric Actuator Design Considering Multimodal Vibration Control

2020 ◽  
pp. 2043009
Author(s):  
Juliano F. Gonçalves ◽  
Emílio C. N. Silva ◽  
Daniel M. De Leon ◽  
Eduardo A. Perondi
Keyword(s):  
Vibration Control ◽  
Active Vibration Control ◽  
Optimization Procedure ◽  
Linear Quadratic Regulator ◽  
Time Interval ◽  
Control Performance ◽  
Linear Quadratic ◽  
Main Work ◽  
Design Variables ◽  
Material Interpolation

This paper addresses the design problem of piezoelectric actuators for multimodal active vibration control. The design process is carried out by a topology optimization procedure which aims at maximizing a control performance index written in terms of the controllability Gramian, which is a measure that describes the ability of the actuator to move the structure from an initial condition to a desired final state in a finite time interval. The main work contribution is that independent sets of design variables are associated with each modal controllability index, then the multi-objective problem can be split into independent single-objective problems. Thus, no weighting factors are required to be tuned to give each vibration mode a suitable relevance in the optimization problem. A material interpolation scheme based on the Solid Isotropic Material with Penalization (SIMP) and the Piezoelectric Material with Penalization (PEMAP) models is employed to consider the different sets of design variables and the sensitivity analysis is carried out analytically. Numerical examples are presented by considering the design and vibration control for a cantilever beam and a beam fixed at both ends to show the efficacy of the proposed formulation. The control performance of the optimized actuators is analyzed using a Linear-Quadratic Regulator (LQR) simulation.

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