scholarly journals Instruments for Noise and Vibration Measurements - Noise, Vibration, Absorption, Insulation

2016 ◽  
Vol 51 (4) ◽  
pp. 501-508
Author(s):  
Hiroshi Nagatomo
Keyword(s):  
Vibration Measurements ◽  
Noise And Vibration ◽  
Vibration Absorption ◽  
Noise Vibration

Analysis of braking noise and vibration measurements by time—frequency approaches

2001 ◽  
Vol 215 (12) ◽  
pp. 1381-1400 ◽  
Author(s):  
J Charley ◽  
G Bodovillé ◽  
G Degallaix
Keyword(s):  
Morlet Wavelet ◽  
Physical Parameters ◽  
Short Time Fourier Transform ◽  
Vibration Measurements ◽  
Noise And Vibration ◽  
Time Frequency ◽  
Simulated Signal ◽  
Noise Vibration ◽  
Morlet Wavelet Transform ◽  
Short Time

This paper presents an analysis of braking noise and vibration measurements using the short-time Fourier transform (STFT), Morlet wavelet transform (WT) and Wigner—Ville distribution (WVD). These time—frequency analysis tools are described and applied successively to a simulated signal and to experimental measurements performed during a braking test. Particular attention is paid to the dependence on rotational speed, and on the correlation between noise, vibration measurements and other physical parameters.

The Importance of Transient Analysis on Internal Combustion Engines Structures

1991 ◽  
Author(s):  
P. A. Drakatos ◽  
S. Haidas
Keyword(s):  
Transient Analysis ◽  
Internal Combustion Engines ◽  
Complex Structure ◽  
Combustion Process ◽  
Combustion Engines ◽  
Vibration Measurements ◽  
Noise And Vibration ◽  
Dynamic Excitation ◽  
Combustion Flow ◽  
Set Up

Abstract Because of difficulties of applying Transient Analysis in complex structure we use a set up of instruments by exploiting the experimental results of known structures of engines. Considering the combustion process as a dynamic excitation, we measure the noise and teh vibration on chosen points on a Spark Ingnition (S.I) engine and a Compression Ingnition engine (C.I). By doing that we come no conclusions concerning the combustion flow. In this experimetnal work appear the spectra of the noise and vibration measurements in connection with the R.P.M. fo the engine. From the comparison between the spectra, we extract important results concerning the chanage of the combustion flow in every different type of engine in several stages. The mesurements have been taken on a S.I. and C.I. engine in Special Engineering Laboratory.

Understanding The Effect Of Noise, Vibration And Seat Discomfort Towards A Passenger’s Vehicle Driver Through Self–reported Survey

2012 ◽  
Author(s):  
Dian Darina Indah Daruis ◽  
Baba Md Deros ◽  
Mohd Jailani Mohd Noor
Keyword(s):  
Key Words ◽  
Body Parts ◽  
Survey Questionnaire ◽  
Online Questionnaire ◽  
Related Factors ◽  
Men And Women ◽  
Noise And Vibration ◽  
Significant Difference ◽  
Noise Vibration ◽  
Different Levels

Satu tinjauan berasaskan soal selidik atas talian telah dijalankan untuk mendapatkan maklumat berkenaan ketidakselesaan pemanduan kenderaan penumpang pemandu Malaysia. Faktor ketidakselesaan yang diselidiki ialah hingar, getaran dan tempat duduk pemandu. Untuk hingar dan getaran, didapati bahawa responden perempuan lebih tidak selesa untuk faktor berkaitan dengan getaran manakala responden lelaki lebih tidak selesa untuk faktor berkaitan hingar. Tiada perbezaan ketara antara ketidakselesaan untuk hingar dan getaran ketika pegun mahupun memecut. Berkenaan ketidakselesaan tempat duduk pemandu, didapati bahawa lebih ramai responden mengalami ketidakselesaan atau kesakitan di bahagian atas belakang. Perbezaan untuk respon ketidakselesaan bagi bahagian badan berlainan antara pemandu lelaki dan perempuan terutamanya disebabkan oleh faktor antropometri. Kedua–dua pemandu lelaki dan perempuan mengalami ketidakselesaan akibat hingar, getaran dan tempat duduk tetapi dengan sensitiviti yang berbeza untuk faktor dan bahagian tubuh yang berlainan. Daripada kajian ini, tiada perbezaan ketara yang dijumpai untuk kesuluruhan ketidakselesaan antara kedua–dua jantina. Meskipun ia berbentuk laporan kendiri, keputusannya adalah selari dengan penemuan daripada kajian–kajian literatur. Kata kunci: Hingar; getaran; tempat duduk pemandu; ketidakselesaan; tinjauan; soal selidik An online questionnaire–based survey was conducted to gather information regarding driving discomfort of Malaysian passengers’ vehicle driver. The discomfort factors investigated were noise, vibration and driver’s seat. For the noise and vibration, it was found that women respondents feel more discomfort for vibration related factors while men respondents feel more discomfort for noise related factors. There was no significant difference between discomfort for noise and vibration during idle or accelerating conditions. Regarding driver’s seat discomfort, it was found that more respondents had experienced discomfort or pain at the upper back. The differences of discomfort responses for different body parts between men and women drivers were mainly caused by anthropometrical factor. Both men and women drivers experience noise, vibration and seat discomfort, however with different levels of sensitivity for different factors and body parts. From this study, no significant difference was found on overall discomfort between genders. Although it is self–reported, the result is in–line with the findings from the literatures. Key words: Noise; vibration; driver seat; discomfort; survey; questionnaire

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