Laboratory Vibration Test Schedule Development for Multi-Exciter Applications

The work presented here explored the detrimental consequences that resulted when mechanical impedance effects were not considered in relating vibration test requirements with field measurements. The ways in which these effects can be considered were evaluated, and comparison of three impedance methods was accomplished based on a cumulative damage criterion. A test structure was used to simulate an equipment and support foundation system. Detailed finite element analysis was performed to aid in computation of cumulative damage totals. The results indicate that mechanical impedance methods can be effectively used to reproduce the field vibration environment in a laboratory test. The establishment of validated computer models, coupled with laboratory impedance measurements, can eliminate the overtesting problems inherent with constant motion, infinite impedance testing strategies.

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White-Noise Vibration Test for Electronic Tubes

IRE Transactions on Reliability and Quality Control ◽

10.1109/ire-pgrqc.1957.5007237 ◽

1957 ◽

Vol PGRQC-9 ◽

pp. 86-92

Author(s):

John D. Robbins

Keyword(s):

White Noise ◽

Vibration Test ◽

Noise Vibration

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Testing and Analysis of the Dynamic Parameters of 3D Reciprocating Compressor Foundation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.204-208.4400 ◽

2012 ◽

Vol 204-208 ◽

pp. 4400-4405

Author(s):

Xin Lin Wan ◽

Su Zhang

Keyword(s):

Vibration Test ◽

Reciprocating Compressor ◽

Dynamic Parameters ◽

Test Results ◽

Large Size ◽

Test Technology ◽

Forced Vibration Test ◽

Machine Base ◽

Compressor Foundation ◽

Data Processing Methods

It is necessary to test dynamics parameters of foundations at construction ground of large-size dynamic machine base. This paper elaborate the test technology and data processing methods on the basis of the block forced vibration test with engineering example, and test results are analyzed and discussed.

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Young’s and shear moduli of glued laminated timber composed of different species obtained by a flexural vibration test

Holzforschung ◽

10.1515/hf-2011-0209 ◽

2012 ◽

Vol 66 (7) ◽

pp. 871-875 ◽

Cited By ~ 3

Author(s):

Yoshitaka Kubojima ◽

Mario Tonosaki

Keyword(s):

Elastic Constants ◽

Pinus Densiflora ◽

Flexural Vibration ◽

Japanese Cedar ◽

Picea Sitchensis ◽

Vibration Test ◽

Shear Moduli ◽

Glued Laminated Timber ◽

Flexural Vibration Test ◽

Lamination Theory

Abstract The applicability of the flexural vibration test to determine the elastic constants of glued laminated timber (GLT) composed of five wood species (ash, Fraxinus spaethiana Lingelsh.; balsa, Ochroma pyramidale Urban.; Japanese cedar, Cryptomeria japonica D. Don; Japanese red pine, Pinus densiflora Sieb. et Zucc.; Sitka spruce, Picea sitchensis Carr.) has been investigated. GLT models were prepared from four laminae with dimensions of 30 (R)×5 (T)×300 (L) mm3. The suitability of Japanese cedar for inner layers in GLTs was tested by flexural vibration test to determine the elastic constants of the laminae and the glued laminated timber. The Young’s and shear moduli were calculated by the Goens-Hearmon regression method based on the Timoshenko theory of bending (TGH method), and the results were compared with the estimated values based on the Young’s and shear moduli measured individually of each lamina. The simple lamination theory was found to be applicable for Young’s modulus but not to shear modulus. The result obtained based on the lamination theory from the shear strain energy was similar to that obtained by the TGH method.

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