Reducing Compressor Station Ambient Noise Level by Controlling Compressor Internal Noise Source

2002 ◽  
Author(s):  
Zheji Liu ◽  
Bill Jahnke ◽  
Mike Marczak ◽  
Paul Kiteck
Keyword(s):  
Noise Level ◽  
High Efficiency ◽  
Noise Source ◽  
Internal Noise ◽  
Sound Intensity ◽  
Control Device ◽  
Third Party ◽  
Intensity Level ◽  
Compressor Station ◽  
Compressor Building

Dresser-Rand single stage pipeline booster compressors have been popular for gas transmission applications due to their high efficiency. As more compressors are installed in natural gas compressor stations close to populated areas, the noise level emitted from the compressor stations becomes a concern. To address the potential community noise concerns, Dresser-Rand recently developed a very effective noise control device — the Duct Resonator array or DR array, to attenuate the internal noise of the compressor, which is typically a major noise source of a compressor station. This technology has been validated by extensive in-house experimental study to be acoustically effective and yet have no measurable adverse effect on aerodynamic performance. This paper discusses the application of DR arrays in two compressors that are in-service at a Williams Gas Pipeline compressor station. Note: the DR arrays are now included in the third unit addition. A successful collaboration among the compressor manufacturer, the compressor user, and a third party acoustics expert was coordinated to take acoustic measurements independently to evaluate the noise reduction provided by the DR arrays. The comprehensive acoustic data acquisition included sound pressure level and sound intensity level measurements around each of the two compressors and several noise level surveys both inside and outside of the compressor building. Noise testing was first performed on each of the two compressors prior to the installation of the DR arrays and was repeated after the compressor hardware modification with DR arrays. A comparison of the noise data recorded before and after the installation of the DR arrays confirmed that the compressor noise level inside the compressor building and the noise level outside of the building were reduced significantly. The DR array has proved to be an efficient and effective device for reducing noise and vibration levels of both existing and new centrifugal compressors and associated piping.

Identification of Noise Sources on a Diesel Engine Using Sound Intensity Measurements

2011 ◽  
Vol 268-270 ◽  
pp. 205-209
Author(s):  
Bao Cheng Zhang ◽  
Peng Fei Zhao ◽  
Bao Ji Li
Keyword(s):  
Noise Level ◽  
Noise Source ◽  
Sound Intensity ◽  
Engineering Practice ◽  
Noise Sources ◽  
Vehicle Noise ◽  
Intensity Measurements ◽  
Noise Source Identification ◽  
Radiation Noise ◽  
Reliable Basis

According to the analysis of acoustic signals and vibration signals measurement, an investigation of the noise source identification in a diesel is presented, and the noise level of the diesel is comprehended. With the sound Intensity method, the major sources of the exterior radiation noise of the engine are surveyed. The research provides the reliable basis for the engineering practice to reduce the vehicle noise level.

scholarly journals The optimum orientation of an absorbing barrier

2005 ◽  
Vol 461 (2060) ◽  
pp. 2369-2383 ◽  
Author(s):  
A.D Rawlins
Keyword(s):  
Noise Level ◽  
Noise Source ◽  
Shadow Region ◽  
Source Position ◽  
Absorbent Material ◽  
Noise Barrier ◽  
Receiver Point

In the following work, we solve the problem of the best orientation of a rigid noise barrier, which has one face lined with absorbent material, between a noise source and a receiver point in the shadow region of the barrier. By the ‘best orientation’, we mean that positioning of the barrier which yields the least noise level at the receiving point for a given barrier and source position.

scholarly journals The Noise Level Measurements of Children’s Sound Books

2021 ◽  
Vol 17 (4) ◽  
pp. 371-379
Author(s):  
Seok-Hee Joo ◽  
Eun-Yeong Shin
Keyword(s):  
Hearing Loss ◽  
External Auditory Canal ◽  
Noise Level ◽  
Sound Intensity ◽  
International Standards ◽  
Children's Books ◽  
Children’S Books ◽  
Hearing Rehabilitation ◽  
Children's Book ◽  
International Standards Organization

Purpose: It was intended to measure the sound intensity of children's sound books and to compare them with the standards of Korea and the International Standards Organization (ISO).Methods: The loudness of 15 children’s sound books was measured at a distance of 25 cm (child’s arm length), and 2.5 cm length of external auditory canal. Measurements taken three times with each book were performed, and the overall sound intensity of the sound books and the sound intensity of each button were measured and compared.Results: Compared with the Korean standard, all the buttons of all books exceeded the standard for the sound volume of the children’s book measured at a distance of 2.5 cm. When comparing the maximum sound intensity measured at a distance of 25 cm with 85 LAmax, a total of 168 buttons of these, 25 (14.88%) were recorded as exceeding the maximum loudness. According to the standards of the ISO, all buttons in all books were below the standard 85 LAeq.Conclusion: Several children’s books are loud enough to cause noise-induced hearing loss, especially when they are placed close to the ear. Strict standards for sound children’s books are required, and it is important to put a warning on the cover of the book. It is expected that the sound intensity of the children’s sound book presented in this study can be referenced when referring to the loudness during hearing rehabilitation in children.

scholarly journals What internal noise source limits peripheral vision?

2017 ◽  
Vol 17 (10) ◽  
pp. 775
Author(s):  
Denis Pelli ◽  
Hörmet Yiltiz
Keyword(s):  
Peripheral Vision ◽  
Noise Source ◽  
Internal Noise

A hollow microlattice based ultralight active thermal control device and its fabrication techniques and thermal performances

2021 ◽  
Author(s):  
Wenjun Xu ◽  
Longquan Liu ◽  
Junming Chen ◽  
Xinying Lv ◽  
Yongtao Yao
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Forced Convection ◽  
Liquid State ◽  
High Efficiency ◽  
Thermal Control ◽  
Test System ◽  
Control Device ◽  
Active Cooling ◽  
Change Material

Abstract This paper introduces a new thermal control device which has not only low weight and high efficiency but also passive and active cooling capabilities. The thermal control device mainly consists of hollow graphene-enhanced-metallic microlattice material, phase change material (PCM) and a peristatic pump. The PCM is inside the spatial-interconnected millimeter-scale diameter tubes, which are the basic constitution of the hollow microlattice material, in addition, the peristatic pump was connected with the tubes and used to force the liquid-state PCM to circulate inside the interconnected thin tubes. Thus, the proposed thermal control device takes combined advantages of the ultralight and high thermal transfer properties of the hollow graphene-enhanced-metallic microlattice materials, the thermal storage capability of the PCM and forced convection of the PCM driven by the peristatic pump as the PCM is in liquid state. The manufacturing process of the active thermal control device was also developed and proposed, which mainly includes additive manufacturing, composite electroless plating, polymer etching, liquid phase change material injecting and the peristatic pump connecting. In addition to that, a thermal test system was built and the effective thermal conductivities of the thermal control device in passive cooling and with active cooling modes were experimentally studied. The thermal control device can absorb heat and actively dissipate heat by means of forced convection. Consequently, the proposed active thermal control device can be used to guarantee the electronic components and spacecrafts operate in a specific temperature range.

Underwater Hearing in the Frog, Rana Catesbeiana

1981 ◽  
Vol 91 (1) ◽  
pp. 57-71 ◽  
Author(s):  
R. ERIC LOMBARD ◽  
RICHARD R. FAY ◽  
YEHUDAH L. WERNER
Keyword(s):  
Sound Pressure ◽  
Rana Catesbeiana ◽  
Sound Intensity ◽  
Torus Semicircularis ◽  
Intensity Level ◽  
Hearing Thresholds ◽  
Average Loss ◽  
Two Measures ◽  
Underwater Hearing ◽  
Hearing Abilities

Comparable auditory sound pressure level (SPL) and sound intensity level(SIL) threshold curves were determined in air and under water in Ranacatesbeiana. Threshold curves were determined using chronic metal electrodeimplants which detected multi-unit responses of the torus semicircularis toincident sound. In terms of SPL, hearing thresholds in water and air aresimilar below 0.2 kHz. Above 0.2 kHz, the sensitivity under water falls of fat about 16 dB/octave to reach an average loss of about 30 dB above 0.4 kHz. In terms of SIL, the organism is about 30 dB more sensitive under water than in air below 0.2 kHz and equally sensitive in air and water above 0.4 kHz.The relative merits of the two measures are discussed and an attempt is made to relate the results to morphology of the middle and inner ears. This report is the first to compare aerial and underwater hearing abilities in any organism using electrode implants.

scholarly journals Influence of Surface Texture Characteristics on the Noise in Grooving Concrete Pavement

2018 ◽  
Vol 8 (11) ◽  
pp. 2141 ◽  
Author(s):  
Dingbang Wei ◽  
Bo Li ◽  
Zhengwei Zhang ◽  
Feng Han ◽  
Xingjun Zhang ◽  
...  
Keyword(s):  
Surface Texture ◽  
Noise Level ◽  
Sound Intensity ◽  
Statistical Correlation ◽  
Concrete Pavement ◽  
Test Method ◽  
Clear Correlation ◽  
Force Coefficient ◽  
Texture Characteristics ◽  
Pavement Noise

To thoroughly explore the relationship between concrete pavement texture characteristics and tire/pavement noise of grooving concrete pavement, the surface texture, i.e., roughness, macrotexture, and microtexture, was investigated in numerous highway pavements. The On-Board Sound Intensity (OBSI) method was used to test the pavement/tire noise. The statistical correlation between concrete pavement texture characteristics and tire/pavement noise was quantitatively described by two correlation analysis methods for highway concrete pavement: origin of linear regression and the Pearson two-sided test method. The results indicate that the effect of pavement roughness on tire/pavement noise is significant, while the noise level is minor for the flat pavement. The macro texture depth also has a marked impact on the tire/pavement noise. In addition, a large grooving depth of concrete pavement could cause a high tire/pavement noise level; however, there is no clear correlation between side-way force coefficient (SFC) and tire/pavement noise.

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