Acoustics '98最新文献

RATING OF SMALL CIRCULATION WATER PUMPS AS SOURCES OF STRUCTURE-BORNE SOUND 对作为结构声源的小型循环水泵进行评级

Acoustics '98 Pub Date : 2024-01-19 DOI: 10.25144/18874

N. Qi, AT Moorhouse, BM Gibbs

引用次数: 0

AN INVESTIGATION OF VEHICLE ACCESSORY NOISE USING THE PRINCIPLE OF ACOUSTIC RECIPROCITY 利用声学互易原理对车辆附件噪音的研究

Acoustics '98 Pub Date : 2024-01-19 DOI: 10.25144/18865

I. Robinson, S. Walsh, G. Stimpson

引用次数: 0

NOISE MONITORING OF A MILITARY TRAINING FIELD 军事训练场噪音监测

Acoustics '98 Pub Date : 2024-01-19 DOI: 10.25144/18875

O. Kr, Ø. Peterssen

引用次数: 0

TRAFFIC CALMING AND ASSOCIATED GROUND VIBRATIONS 交通疏导和相关地面振动

Acoustics '98 Pub Date : 2024-01-19 DOI: 10.25144/18885

V. Krylov

{"title":"TRAFFIC CALMING AND ASSOCIATED GROUND VIBRATIONS","authors":"V. Krylov","doi":"10.25144/18885","DOIUrl":"https://doi.org/10.25144/18885","url":null,"abstract":"Experimental studies by the Transport Research Laboratory (TRL) show that road humps and speed cushions can increase the noise and ground-borne vibration from vehicles passing over them. This paper investigates in more detail the ground vibrations generated by vehicles travelling on roads with humps of different shapes and sizes. A vehicle is modelled as a mechanical system, interacting with the ground surface and having four degrees of freedom, associated with its main low-frequency resonances. Analytical expressions for the generated ground vibration spectra are obtained by solving the dynamic equations and the elastic equation describing ground motion, with appropriate boundary conditions on the ground surface. It is shown that the amplitudes and spectra of the generated ground vibrations depend on the shapes and sizes of the humps, on vehicle speeds and loads, and on ground elastic properties. The level of vibration is roughly proportional to the ratio of hump height to hump length, decreases the smoother the hump, and tends to be maximum at a specific vehicle velocity. The results are compared with those of recent TRL experiments, and a good agreement between theoretical and empirical results is found, so that the theoretical model can be applied successfully in practice. For the covering abstract, see IRRD E100715.","PeriodicalId":518227,"journal":{"name":"Acoustics '98","volume":"13 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140531106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

THE ENVIRONMENTAL NOISE IMPACT OF LIGHT AIRCRAFT: A METHOD FOR COMPARING DIFFERENT LIGHT AIRCRAFT TYPES 轻型飞机对环境噪声的影响：比较不同类型轻型飞机的方法

Acoustics '98 Pub Date : 2024-01-19 DOI: 10.25144/18879

R. J. Weston, D. Humpheson

{"title":"THE ENVIRONMENTAL NOISE IMPACT OF LIGHT AIRCRAFT: A METHOD FOR COMPARING DIFFERENT LIGHT AIRCRAFT TYPES","authors":"R. J. Weston, D. Humpheson","doi":"10.25144/18879","DOIUrl":"https://doi.org/10.25144/18879","url":null,"abstract":"This paper describes a method which the RAF Institute of Health in the UK uses to select a 'quiet' light aircraft, as part of a procurement procedure. A rank-ordered marking scheme was designed to assess the relative loudness-nuisance level of each aircraft for four parameters: (1) aircraft noise level; (2) the SPL of the blade passing frequency; (3) the frequency spectrum of the noise; and (4) subjective value of eleven 'common' flight conditions. Two video tracking cameras recorded aircraft height and lateral offset of flight path, to ensure valid noise measurements. Lamax, Laeq, Lae, and associated 1/3 octave band frequency spectra noise indices were recorded during the trial; they were used to estimate the annoyance and nuisance parameters of each aircraft, by evaluating and comparing the assessment parameters. For each of six types of aircraft, tables give the noise level data, specification of aircraft type, and individual and overall assessments. The blade passing frequency is the most obvious, and using the most annoying element of aircraft noise. The method described here was shown to be a good way of grading aircraft type, but it is essential to use the same operating and measurement methodology for each aircraft type being considered. For the covering abstract, see IRRD E100715.","PeriodicalId":518227,"journal":{"name":"Acoustics '98","volume":"78 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140531111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

NUMERICAL TECHNIQUES FOR SOLVING ACOUSTIC TRANSPARENCY PROBLEMS 解决声学透明度问题的数值技术

Acoustics '98 Pub Date : 2024-01-19 DOI: 10.25144/18869

J-P Coyette, C. Lecomte, CF Mcculloch, J-L Migeot

引用次数: 0

PERCEPTION AND SIGNIFICANCE OF TRANSPORTATION NOISE CHANGES 对运输噪声变化的感知和意义

Acoustics '98 Pub Date : 2024-01-19 DOI: 10.25144/18859

C. Cobbing, M. Rickaby

{"title":"PERCEPTION AND SIGNIFICANCE OF TRANSPORTATION NOISE CHANGES","authors":"C. Cobbing, M. Rickaby","doi":"10.25144/18859","DOIUrl":"https://doi.org/10.25144/18859","url":null,"abstract":"The perception and significance of transport noise change have been central to the noise debate in the current Heathrow Terminal 5 Public Inquiry. 'Perception' relates to the ability of human hearing to detect a noise change, and 'significance' relates to effects of noise changes on humans, such as sleep disturbance, annoyance, and interference with speech. This paper reviews and interprets evidence given to the inquiry on noise changes, especially changes in aircraft and road traffic noise, in terms of the Laeq,16h and Laeq,18h noise indices, respectively. It considers the following questions: (1) the minimum perceptible change for 'simple' sounds; (2) how far perceptible change for 'simple' sounds applies to noise indices; (3) how important the nature of the change to the noise index is; and (4) how to assess the noise changes. The minimum perceptible change of noise seems to be about 3dB(A). Illustrative examples show that perceptible changes in Laeq,16h and Laeq,18h differ from that of a sound level, because of their inherent averaging processes. When assessing changes, it is important to consider changes in the noise's character as well as its time pattern. The human response to noise is complex, and there has been some criticism of the DMRB method of assessing changes in road traffic nuisance. For the covering abstract, see IRRD E100715.","PeriodicalId":518227,"journal":{"name":"Acoustics '98","volume":"394 1-3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140531230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CHARACTERISATION OF ACOUSTIC DEVICES FOR APERTURES 孔径声学装置的特性分析

Acoustics '98 Pub Date : 2024-01-19 DOI: 10.25144/18877

R. Lyons, RH Brown, JL Horner, Bat Petersson

引用次数: 0