Abstract

In paper the fundamental question about optimal interaction between the controlling stimuli generated by the active (powered) and the passive (unpowered) drives of the robotic systems have been studied. A mathematical statement of the problem has been proposed that is suitable to study this question for the semi-passively actuated n-degree-of-freedom robotic systems. The problem is formulated as an optimal control problem for n-degree-of-freedom mechanical system models a semi-passively actuated robot. We take into account the inter ....etc

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The author is from CET, Trivandrum

ABSTRACT

Traditionally, input shaping has been used outside the feedback control loop. Utilizing input shaping in this way prevents it from directly addressing some important vibration control issues such as disturbances, nonzero initial conditions, actuator saturation, etc., These potential applications, however, will never be fully exploited unless a good understanding exists of how to create stable CLSS controllers.

Study of closed-loop stability of feedback loops containing input shapers by ana ....etc

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The dual mass flywheel, or DMF, eliminates excessive transmission gear rattle, reduces gear change/shift effort, and increases fuel economy. There are two basic types of Dual Mass Flywheels. The first is made up of a primary and secondary flywheel with a series of torsion springs and cushions. There is a friction ring located between the inner and outer flywheel that allows the inner and outer flywheel to slip. This feature is designed to alleviate any damage to the transmission when torque loads exceed the vehicle rating of the transmission. T ....etc

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P V Ramaiah J. and G Krishnaiah2
I Department of Mechanical Engineering, Srikalahasteeswara Institute of Technology, Andhra Pradesh, India 2Department of Mechanical Engineering, SV University College of Engineering, Andhra Pradesh, India
The manuscript was received on 15 June 2006 and was accepted after revision for publication on 30 May 2007. DOl: 1O.1243/09544062JMES411


abstract

The paper deals with modelling and design of a friction damper. This has been done in four phases. In the first pha ....etc

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ABSTRACT
This dissertation proposes simple and efficient control algorithms for seismically excited structures using MR dampers and a smart passive system based on MR dampers. Magnetorheological (MR) dampers are one of the most promising control devices for civil engineering applications to earthquake hazard mitigation, because they have many advantages such as small power requirement, reliability, and low price to manufacture. A number of control algorithms have been adopted for semi active systems including the M ....etc

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MAGNETORHEOLOGICAL FLUID DAMPER
1.INTRODUCTION
Vibration isolators or dampers are commonly used to mitigate vibrations in structures or machines. The isolators are typically passive and they are designed to reduce the vibration of the most undesired frequency. However, in many applications, the excitation frequency varies across a large range. In a semi-active device, the stiffness or damping can be adjusted during operation. Changing the stiffness of the support device can be exploited by moving the eigenfrequency of t ....etc

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import java.applet.*;
import java.awt.event.*;
/*


*/
public class InnerClassDemo extends Applet
{
public void init()
{
addMouseListener(new MyMouseAdapter());
addMouseMotionListener(new MyMouseMotionAdapter());

}
class MyMouseAdapter extends MouseAdapter
{
public void mousePressed(MouseEvent me)
{
showStatus(Mouse Pressed);
}
}
class MyMouseMotionAdapter extends MouseMotionAdapter
{
public void mouseDragged(MouseEvent me)
....etc

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MAGNETORHEOLOGICAL FLUID DAMPER
1.INTRODUCTION
Vibration isolators or dampers are commonly used to mitigate vibrations in structures or machines. The isolators are typically passive and they are designed to reduce the vibration of the most undesired frequency. However, in many applications, the excitation frequency varies across a large range. In a semi-active device, the stiffness or damping can be adjusted during operation. Changing the stiffness of the support device can be exploited by moving the eigenfrequency of t ....etc

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Evaluation of Active Damping for Reduction of Noise, Vibration and
Motion of Ground Vehicles
The off-road vehicles are subject to large vibrations which can have severe affects on drivers, crew and load.Most ground vehicles are equipped with passive spring and damping devices which have reached a high
level of sophistication.active damping, has reached production stage for luxury vehicles, trucks and trains.

Studies by Karnopp for automotive applications suggest that the efficiency of semi-active dampers is only marginally low ....etc

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The dual mass flywheel, or DMF, eliminates excessive transmission gear rattle, reduces gear change/shift effort, and increases fuel economy. There are two basic types of Dual Mass Flywheels. The first is made up of a primary and secondary flywheel with a series of torsion springs and cushions. There is a friction ring located between the inner and outer flywheel that allows the inner and outer flywheel to slip. This feature is designed to alleviate any damage to the transmission when torque loads exceed the vehicle rating of the transmission. T ....etc

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ABSTRACT
Magneto rheological fluids commonly known as MR fluids are suspensions of solid in liquid whose properties changes drastically when exposed to magnetic field. Magnetorheological (MR) fluids are materials that respond to an applied field with a dramatic change in their rheological behavior. The essential characteristic of these fluids is their ability to reversibly change from a free-flowing, linear, viscous liquid to a semi-solid with controllable yield strength in milliseconds when exposed to a magnetic field.
....etc

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Abstract:
A modified friction damper is presented to enhance the performance of conventional friction damper and semi-active variable friction damper. An additional plate is provided between the two sliding plates of a conventional friction damper which results in an additional sliding interface with the same normal (clamping) force. Similar modification is also made to semi-active variable friction damper (SAVFD) to enhance its performance. The enhancement in the performance of the benchmark building is studied under across wind loads ....etc

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BOSE ELECTROMAGNETIC SUSPENSION
Abstract:
Now a day s comfort and control are two major aspects in field of design and manufacturing. At present condition spring and damper system are used as shock absorber in automobiles. As concerned to comport and control their system are lagging to provide optimum level of performance. With view of increase the comfort and control electromagnetic suspension system introduced to fulfill the requirement of modern days. This seminar intended to explain the resurgence of interest in th ....etc

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SYNOPSIS
In the present scenario of automobile industry manufacturers are trying to produce comfortable and safe vehicles which the consumers are looking for. A shock absorber is a damping element of the vehicle suspension, and its performance directly affects the comfortability, dynamic load of the wheel and dynamic stroke of the suspension. The conventional type of shock absorbers has got the main drawback that it causes foaming of the fluid at high speeds of operation. This results in a decrease of th ....etc

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INTRODUCTION
Earthquake by itself, is not a disaster, it is natural phenomenon result from ground movement, sometimes violent. Disaster occurs when man made buildings and other structures cannot cope up with these ground movements and fail causing death and destruction of property.
The energy that is released after an earthquake sets up waves called primary wave and secondary waves. These further produce surface waves, which cause vibration of the ground and structures standing on top. Depending on the ....etc

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