scholarly journals EXPERIMENTAL STUDY OF DAMPED OSCILLATIONS OF A TORSIONAL PENDULUM

2018 ◽  
Vol 6 ◽  
pp. 1089-1093
Author(s):  
Zharilkassin Iskakov
Keyword(s):  
Experimental Study ◽  
Least Squares Method ◽  
Mechanical Energy ◽  
Steel Wire ◽  
Torsion Pendulum ◽  
System Quality ◽  
Natural Oscillations ◽  
Inertia Moment ◽  
Damping Parameter ◽  
Torsional Pendulum

A laboratory work methodic on the experimental study of damping torsion oscillations under educational laboratory conditions was developed in this article. A torsion pendulum, which is usually used for bullet flight speed experimental determination based on angular momentum, mechanical energy conservation laws, and the laws of natural oscillations patterns, was used for this purpose. A torsion pendulum is a rod suspended on a vertically stretched steel wire and capable of performing oscillatory motion in the horizontal plane. Two rectangle shaped bodies are attached at the rod's ends, also two identical cylindrical weights that can be moved, changing the inertia moment of the pendulum, and locked in a chosen position, are arranged on the steel rod. Damping parameter dependencies are studied: the damping coefficient, damping logarithmic decrement, relaxation time, amount of oscillations during relaxation and the mechanical system quality factor against pendulum inertia moment. The least squares method was used in the processing of the experimental results. The results from this experimental study prove theoretical dependencies fidelity. The method used in this study may be recommended for physical practicum at universities when there is not a finished installation for the damping of torsional oscillations.

Steel wire ropes failure analysis: Experimental study

2018 ◽  
Vol 91 ◽  
pp. 234-242 ◽  
Author(s):  
Houda Mouradi ◽  
Abdellah El Barkany ◽  
Ahmed El Biyaali
Keyword(s):  
Experimental Study ◽  
Failure Analysis ◽  
Steel Wire ◽  
Wire Ropes

Understanding continuance usage intention of mHealth in a developing country

2020 ◽  
Vol 14 (2) ◽  
pp. 251-272 ◽  
Author(s):  
Md Abdul Kaium ◽  
Yukun Bao ◽  
Mohammad Zahedul Alam ◽  
Md. Rakibul Hoque
Keyword(s):  
Structural Equation ◽  
Information Quality ◽  
Service Providers ◽  
Least Squares Method ◽  
System Quality ◽  
Content Type ◽  
Factors Affecting ◽  
Continuance Usage ◽  
The Government ◽  
Continuance Usage Intention

Purpose This study aims to understand the factors affecting the continuance usage intention (CUI) of mHealth among the rural elderly. Design/methodology/approach An integrated model was proposed with the constructs derived from multiple models such as the unified theory of acceptance and use of technology, information system success model and expectation confirmation model. Data were collected from 400 participants who had prior experiences with mHealth services in Bangladesh. The research model was tested using the partial least squares method based upon structural equation modelling. Findings The findings indicated that system quality, performance expectancy, facilitating conditions and social influence were significant to the degree of confirmation and ultimately affect satisfaction and CUI. Surprisingly, service quality and information quality were insignificant. Research limitations/implications This study has added in the field of knowledge by contributing some new thoughts and interpretations of continuance usage modelling for mHealth services. The findings may become beneficial for the government agencies, policymakers, mHealth systems developers and service providers. Originality/value As limited research was found on CUI of mHealth in the integrated view of rural elderly’s value, this research contributes to the extant literature by categorizing key factors that might support to proliferate the continuance usage of this service. Moreover, the contextualization of the related variables and integration of the existing model is theoretically original. Furthermore, because of a generic approach, the findings could be easily modified to assist other developing countries in the planning and up-take of mHealth.

Experimental study of electroplastic effect on stainless steel wire 304L

2000 ◽  
Vol 281 (1-2) ◽  
pp. 263-267 ◽  
Author(s):  
Guoyi Tang ◽  
Jin Zhang ◽  
Minxin Zheng ◽  
Jie Zhang ◽  
Wei Fang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Stainless Steel ◽  
Steel Wire ◽  
Stainless Steel Wire ◽  
Electroplastic Effect

EXPERIMENTAL STUDY OF ENERGY ABSORPTION PROPERTIES OF GRANULAR MATERIALS UNDER LOW FREQUENCY VIBRATIONS

2004 ◽  
Vol 18 (17n19) ◽  
pp. 2708-2712
Author(s):  
MAO-BIN HU ◽  
XIANG-ZHAO KONG ◽  
QING-SONG WU ◽  
ZHEN-GANG ZHU
Keyword(s):  
Experimental Study ◽  
Granular Materials ◽  
Energy Absorption ◽  
Vibration Frequency ◽  
Absorption Rate ◽  
Low Frequency ◽  
Vibration Energy ◽  
Torsion Pendulum ◽  
Absorption Properties ◽  
Low Frequency Vibration

The low frequency vibration energy absorption properties of granular materials have been investigated on an Invert Torsion Pendulum (ITP). The energy absorption rate of granular material changes nonlinearly with amplitude under low frequency vibration. The frequency of ITP system increases a little with granular materials in the holding cup. The vibration frequency of ITP system does not change with time.

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