An equivalent NVH model of vehicle door seal strip and its application in door vibration problem

2021 ◽  
Vol 179 ◽  
pp. 108063
Author(s):  
Erli Xia ◽  
Ziming Chen ◽  
Zhigang Xue ◽  
Sawei Qiu ◽  
Congchang Xu ◽  
...  
Keyword(s):  
Vibration Problem

A Symmetric Positive Definite Inverse Vibration Problem With Underdamped Modes

1995 ◽  
Author(s):  
Ladislav Starek ◽  
Daniel J. Inman ◽  
Deborah F. Pilkev
Keyword(s):  
Positive Definite ◽  
Inverse Eigenvalue Problem ◽  
Eigenvalues And Eigenvectors ◽  
Symmetric Positive Definite ◽  
Vibration Problem ◽  
Damped System ◽  
Stiffness Matrices ◽  
Inverse Eigenvalue ◽  
Inverse Vibration ◽  
Vector Differential Equation

Abstract This manuscript considers a symmetric positive definite inverse eigenvalue problem for linear vibrating systems described by a vector differential equation with constant coefficient matrices. The inverse problem of interest here is that of determining real symmetric, positive definite coefficient matrices assumed to represent the mass normalized velocity and position coefficient matrices, given a set of specified eigenvalues and eigenvectors. The approach presented here gives an alternative solution to a symmetric inverse vibration problem presented by Starek and Inman (1992) and extends these results to include the definiteness of the coefficient matrices. The new results give conditions which allow the construction of mass normalized damping and stiffness matrices based on given eigenvalues and eigenvectors for the case that each mode of the system is underdamped. The result provides an algorithm for determining a non-proportional damped system which will have symmetric positive definite coefficient matrices.

scholarly journals A modal synthesis method for the elastoacoustic vibration problem

2002 ◽  
Vol 36 (1) ◽  
pp. 121-142 ◽  
Author(s):  
Alfredo Bermúdez ◽  
Luis Hervella-Nieto ◽  
Rodolfo Rodríguez
Keyword(s):  
Synthesis Method ◽  
Vibration Problem ◽  
Modal Synthesis

scholarly journals Free-form optimization of CFRP plate/shell structures in natural vibration problem

2020 ◽  
Vol 86 (891) ◽  
pp. 20-00128-20-00128
Author(s):  
Jin-Xing SHI ◽  
Masatoshi SHIMODA ◽  
Shinobu SAKAI
Keyword(s):  
Natural Vibration ◽  
Shell Structures ◽  
Free Form ◽  
Vibration Problem ◽  
Cfrp Plate

scholarly journals Modal and Vibration Analysis of Filter System in Petrochemical Plant

2017 ◽  
Vol 2017 ◽  
pp. 1-13
Author(s):  
Zhongchi Liu ◽  
Ji Wang ◽  
Wie Min Gho ◽  
Xiao Liu ◽  
Xuebing Yu
Keyword(s):  
Structural Integrity ◽  
Natural Frequencies ◽  
Resonance Effect ◽  
Petrochemical Plant ◽  
Structural Fatigue ◽  
Filter System ◽  
Vibration Data ◽  
Finite Element Software ◽  
Vibration Problem ◽  
System A

Filter systems are widely used in petrochemical plants for removing solid impurities from hydrocarbon oils. The backwash is the cleaning process used to remove the impurities on the sieves of the filters without a need to interrupt the operation of the entire system. This paper presents a case study based on the actual project of a filter system in a petrochemical plant, to demonstrate the significant effect of vibration on the structural integrity of piping. The induced vibration had led to the structural fatigue failure of the pipes connecting the filter system. A preliminary assessment suggested that the vibrations are caused by the operation of backwashing of the filter system. A process for solving the vibration problem based on the modal analysis of the filter system using the commercial finite element software for simulation is therefore proposed. The computed natural frequencies of the system and the vibration data measured on site are assessed based on the resonance effect of the complete system including the piping connected to the filters. Several approaches are proposed to adjust the natural frequencies of the system in such a way that an optimal and a reasonable solution for solving the vibration problem is obtained.

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