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首页> 外文期刊>WSEAS Transactions on Signal Processing >ANGKASA Reverberation Acoustic Chamber Characterization
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ANGKASA Reverberation Acoustic Chamber Characterization

机译：Angkasa混响声学室表征

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Reverberation acoustic chamber has been designed to stimulate as many mode as possible over the frequency spectrum in line to simulate the launching stage and define strength and stress on the test object. Launching stage is producing highly intensity of acoustic pressure by the propulsion system to the launcher's payload and causing numerous of stress and constraints. Knowing the capabilities of the chamber be able to stretch its characteristic thru analysis and calculation. Reverberation time, T_r has been completed by integrated impulse response method. Additional analysis for repeatability measurement can be performed in order to know the exact value for each central frequency T_r. For the chamber diffusivity, number of acoustic mode, frequency response, and natural resonance frequency (MAXTIQ) has been defined. In succession to have sufficient analysis on total spread of frequency spectrum, the modal density, MD and modal analysis, MS has been included. Results shown that chamber can fulfilled in providing the reverberation acoustic test. Most of the chamber resonance cater at least one mode in the half power band width of the test object. Lower frequencies is well covered eventhough it is limited characteristic. Based on the analysis the absorption coefficient are in reasonable arrangement and the calculated equivalent sound absorption area are none exceeds the maximum limit for a chamber volume of 999.5m~3. There is lessen absorption factor when the environment are totally dry air. ANGKASA's RATF OASPL has the capability to meet the maximum 155dB requirement. Further analysis is suggested with different arrangement of OASPL in the chamber for pattern evaluation.
机译：混响声学室已经设计成在线频谱刺激尽可能多的模式，以模拟发射阶段并限定测试对象上的强度和应力。发射阶段通过推进系统生产高度强度的声压力，以发射器的有效载荷，并导致许多压力和限制。知道腔室的能力能够通过分析和计算来延伸其特征。混响时间，通过集成脉冲响应方法完成了T_R。可以执行用于可重复性测量的附加分析，以便知道每个中央频率T_R的确切值。对于腔室扩散率，已经定义了声模式，频率响应和自然谐振频率（MAXTIQ）的数量。连续有足够的分析频谱的总扩展，模态密度，MD和模态分析，MS已被包括在内。结果表明，在提供混响声学测试时可以满足腔室。大多数腔室共振在测试对象的半动力带宽中至少一种模式。较低的频率很好地覆盖它是有限的特征。基于分析，吸收系数是合理的布置，并且计算的等效声音吸收面积没有超过999.5m〜3的腔室容积的最大限制。环境完全干燥空气时，有减少的吸收因子。 Angkasa的RATF OASPL能够满足最大155dB的要求。用不同的OASPL在腔室中的不同布置进行了进一步的分析，以进行模式评估。

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