Topic
Loss factor
About: Loss factor is a research topic. Over the lifetime, 821 publications have been published within this topic receiving 11150 citations.
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01 May 2019
TL;DR: In this paper, the authors deal with changes in the loss factor on the surface of the impregnated transformer paper in the event of thermal degradation, and describe the properties of insulating materials used in the chosen experiment and the impedance spectroscopy method in the frequency domain.
Abstract: This publication deals with changes in the loss factor on the surface of the impregnated transformer paper in the event of thermal degradation. The theoretical part discusses the properties of insulating materials used in the chosen experiment and a description of the impedance spectroscopy method in the frequency domain. The practical part contains experimental description, used transformer paper samples impregnated with different types of transformer oil and analysis of measured results with dependencies of loss factor, depending on frequency.
TL;DR: In this article, a method for the determination of the bulk moduli and loss factors of micro-voided composite materials is presented, which requires that the reflection and transmission coefficients of a tile of uniform thickness are determined in both amplitude and phase as functions of frequency.
Abstract: A method for the determination of the bulk moduli and loss factors of micro‐voided composite materials is presented. The method requires that the reflection and transmission coefficients of a tile of uniform thickness are determined in both amplitude and phase as functions of frequency. Reduction to the bulk modulus and loss factor then proceeds by using the analytic properties of a function of a complex variable derived from the reflection and transmission coefficients. A pulse tube is used for the determination of the complex reflection and transmission coefficients. Although other measurement techniques are available, the pulse tube has proved to be versatile in covering a large range of the frequency‐temperature master curve for typical composite materials used in underwater acoustics. It achieves this versatility by using an anti‐freeze/water mixture as the medium following which measurements can be made over a range of different temperatures.
TL;DR: In this paper, the authors derived the damping characteristics of building materials and members from the concise physical relationship and, calculations of loss factor of some common building material and members are presented, and the loss factor curves of among the walls which made of different materials are gained.
Abstract: In order to describe the damping characteristics of building materials and members, the formula for calculating loss factor which concerns with the internal loss factor and edge losses was derived from the concise physical relationship and, calculations of loss factor of some common building materials and members are presented. Therefore, the loss factor curves of among the walls which made of different materials are gained. It is shown that at low frequency total loss factor (damping) of a building material gradually decreases with the frequency and is also dependent on the thickness of the wall and its longitudinal wave speed, and at high frequency it tends to a constant.
Dissertation•
01 Jan 2013
TL;DR: In this article, the dynamic stability of a three layer sandwich beam with viscoelastic core and functionally graded material constraining layer is studied theoretically and the effect of various system parameters such as core thickness ratio, power law index, core loss factor etc.
Abstract: The present work aims to study the dynamic stability of a three layer sandwich beam with viscoelastic core and functionally graded material constraining layer. Sandwich beam is modelled as a line element having two nodes of each having four degrees of freedom. Finite element method is used to model the beam. Variation of properties of functionally graded material is taken according to a simple power law. The Hsu’s procedure proposed by Saito and Otomi has been used to determine boundaries of stable and unstable regions of the sandwich beam. The effect of various system parameters such as core thickness ratio, power law index, core loss factor etc., on the dynamic stability of the sandwich is studied theoretically. For the fixed- free sandwich beam buckling load decreases with increase in power law index. The frequency parameter first decreases and then increases for increase in power law index and core thickness ratio parameter. Fundamental loss factor of sandwich beam increases with increase in the core loss factor. Increase in core thickness ratio, first decreases and then increases the fundamental loss factor. Increase in power law index values, shows more probability of instability of beam. Increase in thickness ratio also enhances the instability chances of sandwich beam.
TL;DR: In this article, the damping property of MRDC is substantially caused by the friction loss which arises between the magnetic rubber layer and the steel object, and the equation of loss factor of a beam with a sheet of magnetic rubber dampers with a constraining layer (MRDC) is derived by taking friction loss into account to analyze the flexural vibration of the beam.
Abstract: Viscoelastic damping materials with a constraining layer have excellent damping properties, but they have a weighty drawback that many works, such as preliminary treatment of adhesive surfaces and hold of viscoelastic damping materials till adhesive is completely stiffened, are required. To overcome this drawback, magnetic rubber dampers with a constraining layer (MRDC), which are composed of two layers-a magnetic rubber layer and a constraining steel layer-have been developed. They are easy to be fixed onto steel objects due to the attractive force of magnetic rubber layer. The damping property of MRDC is substantially caused by the friction loss which arises between the magnetic rubber layer and the steel object. The equation of loss factor of a beam with a sheet of MRDC is derived by taking the friction loss into account to analyze the flexural vibration of the beam.