**Commenced**in January 2007

**Frequency:**Monthly

**Edition:**International

**Paper Count:**13

# Vibration Control Related Publications

##### 13 Active Linear Quadratic Gaussian Secondary Suspension Control of Flexible Bodied Railway Vehicle

**Authors:**
Kaushalendra K. Khadanga,
Lee Hee Hyol

**Abstract:**

Passenger comfort has been paramount in the design of suspension systems of high speed cars. To analyze the effect of vibration on vehicle ride quality, a vertical model of a six degree of freedom railway passenger vehicle, with front and rear suspension, is built. It includes car body flexible effects and vertical rigid modes. A second order linear shaping filter is constructed to model Gaussian white noise into random rail excitation. The temporal correlation between the front and rear wheels is given by a second order Pade approximation. The complete track and the vehicle model are then designed. An active secondary suspension system based on a Linear Quadratic Gaussian (LQG) optimal control method is designed. The results show that the LQG control method reduces the vertical acceleration, pitching acceleration and vertical bending vibration of the car body as compared to the passive system.

**Keywords:**
Vibration Control,
railway vehicle,
active suspension,
bending vibration

##### 12 Vibration Control of a Functionally Graded Carbon Nanotube-Reinforced Composites Beam Resting on Elastic Foundation

**Authors:**
Mohammad Azadi,
Hamidreza Ghezavati,
Gholamhosein Khosravi

**Abstract:**

**Keywords:**
Vibration Control,
Carbon Nanotubes,
elastic foundation,
piezoelectric layers

##### 11 A Variable Stiffness Approach to Vibration Control

**Authors:**
S. A. Alotaibi,
M. A. Al-Ajmi

**Abstract:**

This work introduces a new concept for controlling the mechanical vibrations via variable stiffness coil spring. The concept relies on fitting a screw though the spring to change the number of active spring coils. A prototype has been built and tested with promising results toward an innovation in the field of vibration control.

**Keywords:**
Vibration Control,
variable stiffness,
coil spring

##### 10 Vibration Control of Two Adjacent Structures Using a Non-Linear Damping System

**Authors:**
Soltani Amir,
Wang Xuan

**Abstract:**

The advantage of using non-linear passive damping system in vibration control of two adjacent structures is investigated under their base excitation. The base excitation is El Centro earthquake record acceleration. The damping system is considered as an optimum and effective non-linear viscous damper that is connected between two adjacent structures. A MATLAB program is developed to produce the stiffness and damping matrices and to determine a time history analysis of the dynamic motion of the system. One structure is assumed to be flexible while the other has a rule as laterally supporting structure with rigid frames. The response of the structure has been calculated and the non-linear damping coefficient is determined using optimum LQR algorithm in an optimum vibration control system. The non-linear parameter of damping system is estimated and it has shown a significant advantage of application of this system device for vibration control of two adjacent tall building.

**Keywords:**
Vibration Control,
Seismic isolation,
Structural Control,
Active and passive damping

##### 9 Nonlinear Dynamic Modeling and Active Vibration Control of a System with Fuel Sloshing

**Authors:**
A. A. Jafari,
A. M. Khoshnood,
J. Roshanian

**Abstract:**

Attitude control of aerospace system with liquid containers may face to a problem associate with fuel sloshing. The sloshing phenomena can degrade the stability of control system and in the worst case, interaction between the attitude control system and fuel vibration leading to resonance. In this paper, a full process of nonlinear dynamic modeling of an aerospace launch vehicle with fuel sloshing is given. Then, a new control system based on model reference adaptive filter is proposed and its algorithm is extracted. This controller implemented on the main attitude control system. Finally, numerical simulation of nonlinear model and control system is carried out to examine the performance of the new controller. Results of simulations show that the inconvenient effects of the fuel sloshing by augmenting this control system are reduced and attitude control system performs, satisfactorily.

**Keywords:**
Vibration Control,
adaptive filter,
nonlinear dynamic modeling,
fuel sloshing,
model reference

##### 8 Simulation of Particle Damping under Centrifugal Loads

**Authors:**
Riaz A. Bhatti,
Wang Yanrong

**Abstract:**

**Keywords:**
Vibration Control,
Vibration Suppression,
particle damping,
Impact damping

##### 7 Controller Design for Euler-Bernoulli Smart Structures Using Robust Decentralized FOS via Reduced Order Modeling

**Authors:**
T.C. Manjunath,
B. Bandyopadhyay

**Abstract:**

**Keywords:**
Vibration Control,
Finite Element Method,
smart structure,
Euler-Bernoulli beam theory,
model order reduction,
LMI,
Fastoutput sampling feedback control,
Statespace model

##### 6 Modeling and FOS Feedback Based Control of SISO Intelligent Structures with Embedded Shear Sensors and Actuators

**Authors:**
T. C. Manjunath,
B. Bandyopadhyay

**Abstract:**

**Keywords:**
Vibration Control,
State Space Model,
Finite Element Method,
smart structure,
SISO,
LMI,
Timoshenko beam theory,
Fast output sampling feedback control

##### 5 Vibration Suppression of Timoshenko Beams with Embedded Piezoelectrics Using POF

**Authors:**
T. C. Manjunath,
B. Bandyopadhyay

**Abstract:**

**Keywords:**
Vibration Control,
State Space Model,
Finite Element Method,
smart structure,
SISO,
Timoshenko beam theory,
Embedded sensors and actuators,
Periodic
output feedback control

##### 4 Control of Vibrations in Flexible Smart Structures using Fast Output Sampling Feedback Technique

**Authors:**
T.C. Manjunath,
B. Bandyopadhyay

**Abstract:**

**Keywords:**
Vibration Control,
Finite Element Method,
smart structure,
LMI,
State spacemodel,
Euler-Bernoulli theory,
SISO model,
Fast output sampling

##### 3 Multivariable Control of Smart Timoshenko Beam Structures Using POF Technique

**Authors:**
T.C. Manjunath,
B. Bandyopadhyay

**Abstract:**

**Keywords:**
Vibration Control,
State Space Model,
Finite Element Method,
smart structure,
Timoshenko theory,
Euler-Bernoulli
theory,
Periodic output feedback control,
Multivariable system,
Linear
Matrix Inequality

##### 2 Controller Design for Euler-Bernoulli Smart Structures Using Robust Decentralized POF via Reduced Order Modeling

**Authors:**
T.C. Manjunath,
B. Bandyopadhyay

**Abstract:**

**Keywords:**
Vibration Control,
Finite Element Method,
smart structure,
Euler-Bernoulli beam theory,
SISO,
Periodic output feedback control,
Reduced Order Model,
State space
model,
Embedded sensors and actuators

##### 1 Mathematical Modeling of SISO based Timoshenko Structures – A Case Study

**Authors:**
T.C. Manjunath,
B. Bandyopadhyay,
Student Member

**Abstract:**

This paper features the mathematical modeling of a single input single output based Timoshenko smart beam. Further, this mathematical model is used to design a multirate output feedback based discrete sliding mode controller using Bartoszewicz law to suppress the flexural vibrations. The first 2 dominant vibratory modes is retained. Here, an application of the discrete sliding mode control in smart systems is presented. The algorithm uses a fast output sampling based sliding mode control strategy that would avoid the use of switching in the control input and hence avoids chattering. This method does not need the measurement of the system states for feedback as it makes use of only the output samples for designing the controller. Thus, this methodology is more practical and easy to implement.

**Keywords:**
Vibration Control,
State Space Model,
Finite Element Method,
mathematical model,
smart structure,
SISO,
Timoshenko beam theory,
Discretesliding mode control,
Bartoszewicz law