Interior Noise Analysis and Prediction of a Tractor Cabin with Emphasis on Correlations with Experimental Data

2013 ◽  
Author(s):  
Sibel Velioglu ◽  
Anıl Yıldız ◽  
Mert Doganli ◽  
Okan Tandogan
Keyword(s):  
Experimental Data ◽  
Noise Analysis ◽  
Interior Noise

Low Frequency Noise Analysis in Advanced CMOS Devices

2011 ◽  
Vol 324 ◽  
pp. 441-444 ◽  
Author(s):  
Jalal Jomaah ◽  
Majida Fadlallah ◽  
Gerard Ghibaudo
Keyword(s):  
Experimental Data ◽  
Noise Analysis ◽  
Low Frequency ◽  
Deep Submicron ◽  
Electrical Noise ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Noise Sources ◽  
The Impact ◽  
Mobility Fluctuations

A review of recent results concerning the low frequency noise in modern CMOS devices is given. The approaches such as the carrier number and the Hooge mobility fluctuations used for the analysis of the noise sources are illustrated through experimental data obtained on advanced CMOS generations. Furthermore, the impact on the electrical noise of the shrinking of CMOS devices in the deep submicron range is also shown.

Active Sandwich Trim Panels for Quieter Aircraft Interior

1999 ◽  
Author(s):  
J. Q. Sun
Keyword(s):  
Experimental Data ◽  
Noise Suppression ◽  
Noise Control ◽  
Interior Noise ◽  
Sandwich Composite ◽  
Power Transfer ◽  
Acoustic Control ◽  
Active Controls ◽  
Trim Panel ◽  
Structural Acoustic Control

Abstract Recent research in the area of structural acoustic control for aircraft interior noise suppression has been focused on developing active trim panels. Active trim panels being part of non-critical structures offer many advantages over active controls applied to load critical structures such as aircraft frames and skins. This paper presents a study of active sandwich composite trim panels. The paper first investigates the effect of curvature on the dynamics of the trim panel, and the power transfer between the actuator and the host panel. Experimental data of interior noise control are then presented to demonstrate the application of the active trim panels.

scholarly journals A Systematic Approach to Identify Sources of Abnormal Interior Noise for a High-Speed Train

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Jie Zhang ◽  
Xinbiao Xiao ◽  
Xiaozhen Sheng ◽  
Zhihui Li ◽  
Xuesong Jin
Keyword(s):  
High Speed ◽  
Sound Pressure ◽  
Systematic Approach ◽  
Noise Analysis ◽  
Interior Noise ◽  
Sound Insulation ◽  
High Speed Train ◽  
Main Contributor ◽  
Vibration Data ◽  
High Speed Trains

A systematic approach to identify sources of abnormal interior noise occurring in a high-speed train is presented and applied in this paper to resolve a particular noise issue. This approach is developed based on a number of previous dealings with similar noise problems. The particular noise issue occurs in a Chinese high-speed train. It is measured that there is a difference of 7 dB(A) in overall Sound Pressure Level (SPL) between two nominally identical VIP cabins at 250 km/h. The systematic approach is applied to identify the root cause of the 7 dB(A) difference. Well planned measurements are performed in both the VIP cabins. Sound pressure contributions, either in terms of frequency band or in terms of facing area, are analyzed. Order analysis is also carried out. Based on these analyses, it is found that the problematic frequency is the sleeper passing frequency of the train, and an area on the roof contributes the most. In order to determine what causes that area to be the main contributor without disassembling the structure of the roof, measured noise and vibration data for different train speeds are further analyzed. It is then reasoned that roof is the main contributor caused by sound pressure behind the panel. Up to this point, panels of the roof are removed, revealing that a hole of 300 cm2 for running cables is presented behind the red area without proper sound insulation. This study can provide a basis for abnormal interior noise analysis and control of high-speed trains.

Effective Interior Noise Analysis & Optimization Technique of Passenger Car

2000 ◽  
Vol 2000.2 (0) ◽  
pp. 131-132
Author(s):  
Yoshinobu Kamada ◽  
Hiroyuki Seino ◽  
Qinzhong Shi ◽  
Shinya Aoyama ◽  
Ichiro Hagiwara
Keyword(s):  
Noise Analysis ◽  
Optimization Technique ◽  
Interior Noise ◽  
Passenger Car

Monte Carlo Simulation of Shot Noise Analysis for Reconstructing Elementary Events: Quantum Bumps in Photoreceptor Cells

1993 ◽  
Vol 48 (5-6) ◽  
pp. 519-528 ◽  
Author(s):  
Stephan Joeken ◽  
Jürgen Schnakenberg
Keyword(s):  
Experimental Data ◽  
Cell Membrane ◽  
Shot Noise ◽  
Single Channel ◽  
Single Photon ◽  
Noise Analysis ◽  
Photoreceptor Cells ◽  
High Light ◽  
Reconstruction Method ◽  
Light Intensities

Abstract Shot noise analysis is a frequently applied method for reconstructing elementary events from experimental data of noisy signals. The subject of this paper is the reconstruction of single photon responses in photoreceptors, the so-called quantum bumps, from experimental data which have been obtained at high light intensities where the quantum bumps can no longer be observed as individual events. The application of this method requires some basic prerequisites which are very likely not satisfied in photoreceptor cells. This situation makes the results of the method questionable. In order to estimate the reliability of shot noise reconstruc­tion in photoreceptors we directly compare the reconstruction results with well known input parameters by using a simulation model for the elementary mechanisms in the cell membrane which cause the response to light stimulation. The comparison shows that the reconstruction method starts to yield errors already at low intensities if only a few percent of the light con­ trolled ionic channels in the cell membrane are open on average. The errors of the method become about 100 percent in the light intensity regime between 10 percent open channels and the onset of bump speck contact on the membrane. The anticipation that the reconstruction method yields single channel events at high light intensities is disproved at least for physiologi­cally realistic intensities.

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