Method for graphical presentation of the complex modulus of damping materials

1992 ◽  
Keyword(s):  
Complex Modulus ◽  
Damping Materials ◽  
Graphical Presentation

Zastosowanie analizy sieci społecznych w badaniach elit parlamentarnych (na przykładzie eurodeputowanych z Polski)

2014 ◽  
pp. 8-24 ◽  
Author(s):  
Piotr Swacha
Keyword(s):  
Social Network ◽  
Social Network Analysis ◽  
Network Analysis ◽  
European Parliament ◽  
Political Groups ◽  
Graphical Presentation ◽  
Relational Network

The purpose of this article is to present the possibilities of using social network analysis (SNA) in the study of the European Parliament elite. This study focuses on organisational connections between Polish members of the European Parliament (seventh term). Official organisational relationships of Polish MEPs include common membership in: political groups, authorities of parliamentary committees and delegations, Parliament’s Bureau, Conference of Presidents, Conference of Committee (and Delegation) Chairs. UCInet and Netdraw programmes were used to calculate SNA’s basic measures and to prepare graphical presentation of relational network created by the Polish MEPs. On this basis main characteristics of the network were presented and MEPs who had the best network locations were distinguished.

Passive Vibration Damping Materials: Piezoelectric Ceramic Composites for Vibration Damping Applications.

1995 ◽  
Author(s):  
Shoko Yoshikawa ◽  
R. Meyer ◽  
J. Witham ◽  
S. Y. Agadda ◽  
G. Lesieutre
Keyword(s):  
Piezoelectric Ceramic ◽  
Ceramic Composites ◽  
Vibration Damping ◽  
Damping Materials

scholarly journals Topology Optimization of Hard-Coating Thin Plate for Maximizing Modal Loss Factors

Coatings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 774
Author(s):  
Haitao Luo ◽  
Rong Chen ◽  
Siwei Guo ◽  
Jia Fu
Keyword(s):  
Topology Optimization ◽  
Objective Function ◽  
Composite Plates ◽  
Optimization Method ◽  
Hard Coating ◽  
Design Variables ◽  
Coating Composite ◽  
Damping Materials ◽  
Topology Optimization Method ◽  
Loss Factors

At present, hard coating structures are widely studied as a new passive damping method. Generally, the hard coating material is completely covered on the surface of the thin-walled structure, but the local coverage cannot only achieve better vibration reduction effect, but also save the material and processing costs. In this paper, a topology optimization method for hard coated composite plates is proposed to maximize the modal loss factors. The finite element dynamic model of hard coating composite plate is established. The topology optimization model is established with the energy ratio of hard coating layer to base layer as the objective function and the amount of damping material as the constraint condition. The sensitivity expression of the objective function to the design variables is derived, and the iteration of the design variables is realized by the Method of Moving Asymptote (MMA). Several numerical examples are provided to demonstrate that this method can obtain the optimal layout of damping materials for hard coating composite plates. The results show that the damping materials are mainly distributed in the area where the stored modal strain energy is large, which is consistent with the traditional design method. Finally, based on the numerical results, the experimental study of local hard coating composites plate is carried out. The results show that the topology optimization method can significantly reduce the frequency response amplitude while reducing the amount of damping materials, which shows the feasibility and effectiveness of the method.

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