Support conditions for experimental modal analysis

被引：0

作者：

Carne, Thomas G. ^{[1
]}

Griffith, D. Todd ^{[1
]}

Casias, Miguel E. ^{[1
]}

机构：

[1] Sandia Natl Labs, Albuquerque, NM 87185 USA

来源：

SOUND AND VIBRATION | 2007年 / 41卷 / 06期

关键词：

12;

D O I：

暂无

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

When modal testing a structure for model validation, free boundary conditions are frequently approximated in the lab to compare with free boundary-condition analyses. Free conditions are used because they are normally easy to simulate analytically and easier to approximate experimentally than boundary conditions with fixed conditions. However, the free conditions can only be approximated in the lab, because the structure must be supported in some manner. This article investigates and quantifies the effects of the support conditions on both the measured modal frequencies and damping factors. The investigation has determined that the measured modal damping is significantly more sensitive to the support system (stiffness and damping) than the measured modal frequency. Included in the article are simple formulas that can be used to predict the effect on measured modal parameters given the support stiffness and damping.

引用

页码：10 / 16

页数：7

共 12 条

[1]

[Anonymous], 1945, THEORY SOUND

[2]

Avitabile P, 2006, EXP TECHNIQUES, V30, P19, DOI 10.1111/j.1747-1567.2006.00039.x

[3]

BISPLINGHOFF RL, 1955, AEROELASTICITY, P771

[4] Part I: The pitfalls, pratfalls, and downfalls of fixturing [J].

Brillhart, R ;

Hunt, D .

EXPERIMENTAL TECHNIQUES, 2005, 29 (06) :58-61

[5]

CARNE TG, P 16 INT MOD AN C SE, P477

[6]

Ewins DJ, 2000, MODAL TESTING THEORY

[7]

Lazan B J, 1968, DAMPING MAT MEMBERS

[8]

MAIA NMM, 1997, THEORETICAL EXPT MOD, P32

[9]

PILKEY DF, P 1L INT MOD AN C SE, P104

[10]

SLATER JC, P 11 INT MOC AN C SE, P1508

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