Judgment of Defective Gear by Vibration Measurement and Analysis

2005 ◽  
Author(s):  
Kazuhiko Morimoto ◽  
Nobuyuki Okubo ◽  
Takeshi Toi ◽  
Tsuyoshi Okumura
Keyword(s):  
Vibration Measurement ◽  
Measurement And Analysis

Measurement and Analysis of Shipboard Vibrations

1998 ◽  
Vol 35 (01) ◽  
pp. 1-9
Author(s):  
DeBord Frank ◽  
Hennessy William ◽  
McDonald Joseph
Keyword(s):  
Measurement System ◽  
Vibration Response ◽  
Vibration Measurement ◽  
Ship Construction ◽  
Vibration Data ◽  
Construction Specifications ◽  
Analysis Methods ◽  
Measurement And Analysis ◽  
Potential Problems ◽  
Maintenance Requirements

Excessive shipboard vibrations can cause structural and machinery failures, crew discomfort and fatigue, and increased maintenance requirements for shipboard systems. In many cases ship construction specifications require the shipyard to demonstrate "acceptable " levels of vibration using measurements completed during sea trials. This paper provides an overview of standards for these measurements and modern techniques used to collect and analyze the specified vibration data. A brief discussion of the types of vibrations found on ships and their causes is followed by a review of codes, guides and standards for vibration measurement. Instrumentation suitable for measurement of each type of vibration response is described and the design of a typical trial measurement system is presented. Techniques for analyzing and presenting trial results are reviewed and compared with analysis methods specified by SNAME, ISO and NAVSEA. Finally, a discussion of potential problems faced by an owner and shipyard in developing and meeting a vibration measurement specification is offered.

Wavelet Analysis of Vibration: Part 1—Theory

1994 ◽  
Vol 116 (4) ◽  
pp. 409-416 ◽  
Author(s):  
D. E. Newland
Keyword(s):  
Signal Analysis ◽  
Spectral Composition ◽  
Vibration Measurement ◽  
Harmonic Wavelets ◽  
Time Frequency ◽  
Orthogonal Wavelets ◽  
Vibration Data ◽  
Measurement And Analysis ◽  
Frequency Map ◽  
Selection Of

Wavelets provide a new tool for the analysis of vibration records. They allow the changing spectral composition of a nonstationary signal to be measured and presented in the form of a time-frequency map. The purpose of this paper, which is Part 1 of a pair, is to introduce and review the theory of orthogonal wavelets and their application to signal analysis. It includes the theory of dilation wavelets, which have been developed over a period of about ten years, and of harmonic wavelets which have been proposed recently by the author. Part II is about presenting the results on wavelet maps and gives a selection of examples. The papers will interest those who work in the field of vibration measurement and analysis and who are in positions where it is necessary to understand and interpret vibration data.

Transverse Vibration Measurement and Analysis of a Three-Point Supported Dual-Span Rotor System with Angle Misaligned Flexible Coupling

2011 ◽  
Vol 301-303 ◽  
pp. 790-796
Author(s):  
Guo Quan Feng ◽  
Bai Zhuo Zhou ◽  
Li Jing Lin ◽  
Qing Kai Han
Keyword(s):  
Rotor System ◽  
Vibration Measurement ◽  
The Finite Element Method ◽  
Test Rig ◽  
Rotor Vibration ◽  
Angular Misalignment ◽  
Flexible Coupling ◽  
Rotating Speed ◽  
Response Characteristics ◽  
Measurement And Analysis

The angular misalignment of a three-point supported dual-span rotor system is discussed. Vibration measurement for coupling misalignment is taken in this paper by using the model test rig, and the rotor vibration response characteristics with different misalignment quantities and different rotating speed are compared. Based on the finite element method, researches on the three-point supported dual-span rotor system are made, and then the simulation and experimental results are compared. Both the simulation and the measurement are compared to show the features. The results show that the amplitudes of the misaligned rotor vary with rotating speeds and misalignment angles, and the center orbits of the misaligned rotor change into ellipses with the increase of misalignment, together with double harmonic responses.

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