scholarly journals Experimental verification on applying indirect inverse substructuring analysis to identify coupling dynamic stiffness of mechanical assembly via planar surface

2018 ◽  
Vol 20 ◽  
pp. 213-218
Author(s):  
Guang-qing Lu ◽  
Kun-peng Xu ◽  
Wen-bin Peng ◽  
Minvydas Ragulskis ◽  
Bo Wang
Keyword(s):  
Experimental Verification ◽  
Dynamic Stiffness ◽  
Planar Surface ◽  
Mechanical Assembly ◽  
Coupling Dynamic

Verification on Indirect Inverse Substructuring Method for Coupling Dynamic Stiffness Identification of a Mechanical Assembly

2012 ◽  
Vol 562-564 ◽  
pp. 552-555
Author(s):  
Guang Qing Lu ◽  
Dong Mei Pang ◽  
Kui Dong ◽  
Bin Zhou ◽  
Xian Neng Li
Keyword(s):  
Experimental Verification ◽  
Dynamic Stiffness ◽  
Simple Approach ◽  
Response Functions ◽  
Mechanical Assembly ◽  
Testing Data ◽  
Coupling Dynamic ◽  
Dynamic Quality ◽  
Product Assembly

Indirect inverse substructuring dynamic analysis has been developed recently by the author of this paper and provides a new simple approach to determine the coupling dynamic stiffness, which is one of important characteristics estimating dynamic quality of a mechanical product assembly. Based on a physical model consisting of “8-mass plus 16-spring and 8-damping” elements, this paper provides a set of validation on the completeness and effectiveness of the approach. Experimental verification is also carried out by use of eighty testing data of frequency response functions (FRFs).

Error Effects on Identifying Coupling Dynamic Stiffness of a Mechanical Assembly by Indirect Inverse Substructuring Dynamic Analysis

2012 ◽  
Vol 562-564 ◽  
pp. 556-559 ◽  
Author(s):  
Guang Qing Lu ◽  
Lei Wang ◽  
Kui Dong ◽  
Xin Guang Lu ◽  
Xian Neng Li
Keyword(s):  
Dynamic Analysis ◽  
Frequency Response ◽  
Dynamic Stiffness ◽  
Simple Approach ◽  
Mechanical Assembly ◽  
Mass Model ◽  
Mechanical Assemblies ◽  
Parametric Studies ◽  
Measuring Frequency ◽  
Coupling Dynamic

Indirect inverse substructuring dynamic analysis has been developed recently by the author of this paper and provides a new simple approach to identify the coupling dynamic stiffness of mechanical assemblies. To analyze the error effects of measuring frequency response fuctions (FRFs) on the identification, this study implements a set of parametric studies on basis of a lamped mass model to deal with parametric studies which result in some guidance for applications of the approach.

scholarly journals Indirect Inverse Substructuring Method for Multibody Product Transport System with Rigid and Flexible Coupling

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Jun Wang ◽  
Li-xin Lu ◽  
Pengjiang Qian ◽  
Li-qiang Huang ◽  
Yan Hua ◽  
...  
Keyword(s):  
Transport System ◽  
Dynamic Equilibrium ◽  
Dynamic Stiffness ◽  
Measuring System ◽  
System Level ◽  
Lumped Mass ◽  
Component Level ◽  
Flexible Coupling ◽  
Coupling Dynamic ◽  
Mass Spring

The aim of this paper is to develop a new frequency response function- (FRF-) based indirect inverse substructuring method without measuring system-level FRFs in the coupling DOFs for the analysis of the dynamic characteristics of a three-substructure coupled product transport system with rigid and flexible coupling. By enforcing the dynamic equilibrium conditions at the coupling coordinates and the displacement compatibility conditions, a closed-form analytical solution to inverse substructuring analysis of multisubstructure coupled product transport system is derived based on the relationship of easy-to-monitor component-level FRFs and the system-level FRFs at the coupling coordinates. The proposed method is validated by a lumped mass-spring-damper model, and the predicted coupling dynamic stiffness is compared with the direct computation, showing exact agreement. The method developed offers an approach to predict the unknown coupling dynamic stiffness from measured FRFs purely. The suggested method may help to obtain the main controlling factors and contributions from the various structure-borne paths for product transport system.

The Measurement and Finite Element Analysis of the Dynamic Stiffness of Nonuniform Clearance, Gas, Thrust Bearings

1991 ◽  
Vol 113 (4) ◽  
pp. 768-774 ◽  
Author(s):  
P. Holster ◽  
J. Jacobs ◽  
J. Roblee
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Dynamic Loading ◽  
Experimental Verification ◽  
Dynamic Stiffness ◽  
Test Apparatus ◽  
Element Analysis ◽  
Fem Model ◽  
Thrust Bearings

This paper presents an overview of a finite-element-method (FEM) approach for the calculation of the dynamic stiffness of circular, externally pressurized gas thrust bearings with a nonuniform clearance. Some observations are made about the characteristic behavior of gas bearings subject to dynamic loading. The primary emphasis of this paper, however, is the development and qualification of a test apparatus and the necessary test techniques for measuring dynamic stiffness up to 250 N/μm at frequencies up to 2000 Hz. A thorough, experimental verification of the FEM model is reserved for a later paper.

Research on Minimum Mechanism of Roughness of ELID Grinding

2010 ◽  
Vol 135 ◽  
pp. 441-446 ◽  
Author(s):  
Ji Cai Kuai ◽  
Hua Li Zhang ◽  
Fei Hu Zhang ◽  
Yong Zhang
Keyword(s):  
Oxide Film ◽  
Experimental Verification ◽  
Dynamic Stiffness ◽  
Spring Stiffness ◽  
Precision Grinding ◽  
Passivating Film ◽  
Elid Grinding ◽  
Hard And Brittle Materials ◽  
Simulation And Experiment ◽  
Mirror Grinding

ELID grinding technology is used widely in the precision grinding of hard and brittle materials. The nature of passivating film play an important role in ELID mirror grinding. Spring’s stiffness of passivating film was researched from theory and simulation and experiment. And the theory of the dynamic stiffness of spring was proposed, based on this theory minimum mechanism of roughness of ELID grinding was proposed further, and experimental verification was done. Results show, the spring stiffness of passivating film is change with the grinding paramenter, and when implementing the precision grinding, the elastic deformation of oxide film reduces the exposure and grinding depth of the grinding grains, accordingly, ameliorating the grinding surface quality.

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