scholarly journals Experimental Study on Effects of Elastomer Coating on the Vibration-Damping Property of Steel and CFRP Plates for Ship's Hull

2005 ◽  
Vol 71 (706) ◽  
pp. 982-989 ◽  
Author(s):  
Shigemitu KURANO
Keyword(s):  
Experimental Study ◽  
Vibration Damping ◽  
Damping Property ◽  
Elastomer Coating

Experimental Study of Static Aerodynamic Coefficients of Bridge Section

2011 ◽  
Vol 301-303 ◽  
pp. 780-784
Author(s):  
Liang Gao ◽  
Jian Xin Liu ◽  
Miao Liu
Keyword(s):  
Experimental Study ◽  
Wind Tunnel ◽  
Influencing Factors ◽  
Structural Characteristics ◽  
Wind Tunnel Test ◽  
Vibration Damping ◽  
Wind Loads ◽  
Aerodynamic Coefficients ◽  
Central Trough ◽  
Section Model

With HK-Zhuhai-Macau Bridge as the engineering background, through the section model wind tunnel test, research into the influence of vibration damping measure to the static aerodynamic coefficients of the structure, so as to seek to improve structural characteristics. The influencing factors of static aerodynamic coefficients including the guide plate position, the central trough opening rate, baluster drafty rate, repair car track position, windbreak, and vehicle. The results show that the changes of the static aerodynamic coefficients directly affect the static wind loads, and the influence of changes of these parameters to the static wind load cannot be ignored.

Basic Experimental Study on Rubber Materials for Vibration Damping in Vehicles

2016 ◽  
Vol 693 ◽  
pp. 292-296
Author(s):  
Cong Ling Zhu ◽  
J. Xu ◽  
S. Li ◽  
C.H. Zhu
Keyword(s):  
Experimental Study ◽  
Constant Temperature ◽  
Indoor Environment ◽  
Vibration Damping ◽  
Experimental Equipment ◽  
Vehicle System ◽  
Basic Experiments ◽  
Application Scope

In the constant-temperature indoor environment, the static principles of rubber materials for vibration damping in vehicles and the load and application scope of the experiments are studied in this paper. Basic experiments are carried out for common rubber materials in vehicle system by using advanced experimental equipment.

scholarly journals An analytical and experimental study on dampening material effects on the dynamic behavior of free-free aluminum sheets

2021 ◽  
pp. 111-122 ◽  
Author(s):  
R. Khorasani ◽  
S. A. Hosseini Kordkheili ◽  
H. Parviz
Keyword(s):  
Experimental Study ◽  
Analytical Solution ◽  
Dynamic Behavior ◽  
Loss Factor ◽  
Vibration Damping ◽  
Damping Properties ◽  
Free Boundary Conditions ◽  
Aluminum Sheets ◽  
Analytical Relations ◽  
Damping Systems

This work aims to present an experimentally verified analytical solution to examine damping properties of systems including viscoelastic treatments. Although there are several methods for characterizing the behavior of three-layer damping systems, the RKU method is the most frequently used one. In this paper, this method is modified such a way that to be applied for a five-layer damping system. The achieved analytical relations are then employed to study the effects of a four-layer vibration-absorbing coating on the dynamic behavior of an aluminum sheet with free-free boundary conditions. Since the vibration-damping properties of the coating are unknowns, its loss factor and shear modulus are experimentally extracted based on the ASTM E756-05 standard method. The comparison between the analytical solution and performed modal tests expresses the efficiency of the presented method.

scholarly journals Damping properties of para-phenylene terephthalamide pulps modified damping materials

2016 ◽  
Vol 36 (2) ◽  
pp. 137-148 ◽  
Author(s):  
Baihua Yuan ◽  
Meng Chen ◽  
Yu Liu ◽  
Shexu Zhao ◽  
Heng Jiang
Keyword(s):  
Mechanical Properties ◽  
Loss Modulus ◽  
Dynamic Mechanical Properties ◽  
Vibration Damping ◽  
Damping Properties ◽  
Machine Direction ◽  
Scanning Calorimetry ◽  
Dynamic Mechanical ◽  
Damping Property ◽  
Damping Materials

A series of para-phenylene terephthalamide pulp modified damping materials were prepared. The dynamic mechanical properties, differential scanning calorimetry, vibration damping properties, vulcanization property, tensile strengths as well as scanning electron microscopy micrographs of the damping materials were studied theoretically and experimentally. The dynamic mechanical properties of para-phenylene terephthalamide pulp modified damping materials were also compared with aramid short-cut fiber, E-glass staple fiber and carbon fiber powder modified damping materials. The results showed that para-phenylene terephthalamide pulp modified damping materials exhibited the best damping property and highest modulus in comparison with the other types of fibers. The storage modulus ( E′), loss modulus ( E″) and tensile strength of the materials were all increased significantly with increasing pulp content, and this trend was significantly greater in machine direction rather than in cross-machine direction. The second, third and fourth modes modal loss factors (η) of the steel beams coated with para-phenylene terephthalamide pulp modified damping materials increased substantially up to a maximum, and then became stable with increasing pulp amount. The optimal η in machine direction was achieved as the mass ratio of butadiene-acrylonitrile rubber to para-phenylene terephthalamide pulp was 100:30. Excellent damping property was mainly attributed to the extremely high interfacial contact area which significantly improved the efficiency of energy dissipation of internal friction, interfacial sliding and dislocation motion between para-phenylene terephthalamide pulps and butadiene-acrylonitrile rubber chains. Since para-phenylene terephthalamide pulp modified damping materials offer a high E′, excellent vibration damping properties, broad damping temperature and frequency ranges, it is ideal for free-damping structures which are widely utilized in industrial vibration and noise control applications.

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