looking for differnt dampers used in tall buildings ppt ....etc

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Many structures have their fundamental frequencies of vibration within the range
of frequencies where the energy of most of the earthquake ground motions is a maximum. In such cases a structure will amplify the ground vibrations and produce accelerations, which increases from the base of the structure to its top. Besides producing undesirable levels of acceleration in the structure, these amplified structural motions can cause large stresses in structural elements and large relative displacements between different parts of the structure. This ....etc

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GUIDED BY
PROF. B. Koti Veerachari

SUBMITTED BY
Rakesh Kumar


List of contents
Introduction
Types of vibration
Effects of vibration
Sources of vibration excitation
Vibration control in machine tool
Damping
Conclusion
References

Introduction
Machining and measuring operations are invariably accompanied by vibration.
To achieve higher accuracy and productivity vibration in machine tool must be controlled.
For analysis of dynamic behavior of machin ....etc

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please forward me ppt and report on seismic dampers

please forward me ppt and report on seismic dampers ....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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Innovative Designs for Magneto-Rheological Dampers



Introduction
The main purpose of this chapter is to introduce the topic of magneto-rheological
(MR) dampers to the reader. Also presented is an explanation of the mechanism
through which MR fluid works. Lastly, the project objectives and the approach
taken to evaluate different MR damper designs are discussed.

1.1 An Overview of Magneto-Rheological Dampers
In recent years, manufacturers have shown an increased inte ....etc

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Shock absorbers and their performance during the earthquake. In addition, they have investigated the world's tall buildings and have studied a satisfactory level of damper performance. And the results show that not only shock absorbers have acceptable seismic behavior against lateral forces such as wind and earthquakes. However, it has reduced the limitations of building multi-storey buildings. A tuned dampener, also known as a harmonic damper, is a device mounted on structures to reduce the amplitude of mechanical vibrations. Its application c ....etc

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The most widely used pesticides utilized for the management of plant-parasitic nematodes
belong to the organophosphorus group. Their efficacy may be reduced in areas where adapted
microorganisms accumulate that are capable of rapidly degrading the active ingredients. The
enhanced biodegradation process of non-fumigant nematicides is of particular concern in
intensive agriculture. However, it remains unclear which microorganisms play the most
important role in the rapid metabolization and how and why this process develops.
Furthermore litt ....etc

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A magnetorheological damper or magnetorheological shock absorber is a damper filled with magnetorheological fluid, which is controlled by a magnetic field, usually using an electromagnet This allows the damping characteristics of the shock absorber to be continuously controlled by varying the power of the electromagnet. This type of shock absorber has several applications, most notably in semi-active vehicle suspensions which may adapt to road conditions, as they are monitored through sensors in the vehicle, and in prosthetic limbs. ....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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