A New Complex Structural-Acoustic Coupling Response Analysis Method Based On Finite Element-Modal Energy Analysis

2019 ◽  
Author(s):  
Yu Shijia
Keyword(s):  
Finite Element ◽  
Energy Analysis ◽  
Response Analysis ◽  
Analysis Method ◽  
Acoustic Coupling ◽  
Complex Structural

A Rectified Statistical Energy Analysis Method Using Finite Element Analysis

2006 ◽  
Author(s):  
Xian-Jun Wu ◽  
Jian-Hua Cao ◽  
Shi-Jian Zhu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Energy Analysis ◽  
Input Power ◽  
Analysis Method ◽  
Coupling Loss ◽  
Element Analysis ◽  
Long Time ◽  
Two Parameters ◽  
Single Part

Two parameters, namely modal number (Nm) and modal overlap factor (Mo), are used as the indicators of the reliability of SEA prediction. It is suggested that Mo>1 and Nm>5 can be used to judge if the SEA prediction is reliable in prediction of plate vibration. In the mid-frequency, those conditions are hard to satisfy. Although it takes long time and great expense and even it is impossible to apply finite element analysis to the whole structure, it is economically to calculate a local single part and coupled parts. If the value of input power and coupling loss factor can be replaced by the value calculated by FEM, the precision of SEA can be greatly improved. Calculation example was given and the validity was proved.

A similitude for the middle-frequency vibration response of satellite solar array based on the wave coupling hybrid finite element–statistical energy analysis method

2020 ◽  
Vol 234 (18) ◽  
pp. 3560-3570 ◽  
Author(s):  
Fengxia He ◽  
Zhong Luo ◽  
Lei Li ◽  
Yongqiang Zhang
Keyword(s):  
Finite Element ◽  
Scaling Laws ◽  
Energy Analysis ◽  
Vibration Response ◽  
Solar Array ◽  
Complex Structures ◽  
Statistical Energy Analysis ◽  
Analysis Method ◽  
Wave Coupling ◽  
Hybrid Finite Element

A similitude is proposed for the dynamic response analysis of a satellite solar array. It is defined by invoking the wave coupling hybrid finite element–statistical energy analysis method which is considered as an effective way to solve the wide frequency (especially middle-frequency) vibration response of complex structures. The scaling laws are then derived by looking for equalities in the structural responses. A numerical case involving an assembly of two plates is discussed to verify the proposed scaling laws. Moreover, the new similitude is applied to a simplified satellite solar array model. If the analysis frequency step is selected appropriately, it is shown that a complete similitude can be defined: it allows predicting the vibration response of satellite solar array and provides the possibility for the model test of complex structures.

Outline of Guideline for Seismic Response Analysis Method Using 3D Finite Element Model of Reactor Building

2021 ◽  
Author(s):  
Byunghyun Choi ◽  
Akemi Nishida ◽  
Tadahiko Shiomi ◽  
Manabu Kawata ◽  
Yinsheng Li
Keyword(s):  
Finite Element ◽  
Seismic Response ◽  
Response Analysis ◽  
Main Body ◽  
Accuracy Evaluation ◽  
Analysis Method ◽  
Nuclear Facilities ◽  
Lumped Mass ◽  
Seismic Response Analysis ◽  
Reactor Building

Abstract In the seismic safety assessment and design of building structures in nuclear facilities, lumped mass models are conventionally used. However, they cannot possess the required high-accuracy evaluation of nuclear facilities, such as the local response at the equipment location in a reactor building. From this point of view, a seismic response analysis method using a three-dimensional finite element (3D FE) model is indispensable. Furthermore, because analysis results obtained using 3D FE models vary to a large degree depending on the experience and knowledge of analysts, the quality of analysis results should be ensured by developing a standard analysis method. In the Japan Atomic Energy Agency, we have developed a guideline for seismic response analysis methods that adopt 3D FE models of reactor buildings, and we plan to publish it as JAEA report. The guideline consists of a main body, commentary, and several appendixes; it also includes procedures, recommendations, points of attention, and a technical basis for conducting seismic response analysis using 3D FE models of reactor buildings. In this paper, the outline of the guideline and analysis examples based on the guideline are presented.

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