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首页> 美国政府科技报告 >Design and Construction of an Acoustic Shock Tube for Generating High-Level Impulses to Test Hearing Protection Devices.
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Design and Construction of an Acoustic Shock Tube for Generating High-Level Impulses to Test Hearing Protection Devices.

机译：用于测试听力保护装置的高水平脉冲的声学激波管的设计和构造。

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This report describes the design and construction of the NIOSH acoustic shock tube. The first prototype shock tube was built under a contract to the University of Cincinnati, but suffered from design flaws that prevented it from achieving the specified impulse ranges. A second prototype shock tube was designed and constructed by Cauble Precision Machine Inc. of Lawrenceburg, IN. The second prototype could generate the specified impulse ranges, but because the manual clamping system to hold the membrane and pressurizing the shock tube chamber was unwieldy to use for a sustained period. NIOSH modified the shock tube and improved the pressure control and installed a pneumatic clamping system on the third prototype shock tube. Safety features were integrated into the pneumatic clamping system to prevent inadvertent crushing of hands or fingers between the flanges. An acoustic horn was designed and manufactured to provide impedance matching between the shock tube and the room. The horn provided a small amount of gain necessary to generate impulses at the highest peak pressure levels 166 to 170 dB SPL. In summary, the operational performance and safety of the third shock tube was significantly improved relative to the second prototype. The modifications to the acoustic shock tube have been incorporated into subsequent versions of the shock tube manufactured and sold by B/C Precision Tool (formerly Cauble Precision Machine Inc.). Conclusions: The NIOSH acoustic shock tube has demonstrated that impulses can be successfully produced using a polyester membrane of thicknesses of 0.001 or 0.002 inch thickness. In addition, this system, developed in support of the Environmental Protection Agency hearing protector labeling requirements (40CFR Part 211 Subpart B), fulfills the operational requirements specified in the ANSI S12.42-2010 standard. This report describes the design, construction and basic operation of shock tube.

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