Determination of range of audibility of sound signal 信号听距测定
2.
Sometimes audibility is other heart sounds or murmur , likely disease place causes want an attention 有时可听到其他心音或者杂音，要注重有可能是疾病所引起的。
3.
Will stethoscopic wall of bosom of the area before be being put to the heart , audibility every normal cardiac cycle by " dong " , " da " two composition 将听诊器放至心前区胸壁，可听到每个正常心动周期由“咚“ 、 “哒“两声组成。
4.
Youth sometimes audibility the 3rd heart sounds , originate diastolic when blood the room wall that from atrium irruptive ventricle produces is oscillatory 年轻人有时可听到第三心音，来源于心脏舒张时血液从心房冲入心室产生的室壁振动。
5.
Introducing the theory and application of boundary element method on the sound radiation , giving the process of solving vibration noise radiation problem using boundary element analysis software ; presenting the coupling theory and the combination analysis of finite element method and boundary element method , and doing relevant analysis based on close drum shell ; programming the noise data simulation program using the numerical calculation software , simulating the acoustic and pressure data of a key point in the transient response acoustic field of the close drum shell , realizing the audibility of the noise , using the virtual reality tools to simulate the vibration noise of the drum shell ; combining the finite element method and boundary element method to analyze the vibration noise radiation of some gear box , and completing the whole simulation process of the vibration noise of the gear box 综合介绍了边界元法在声辐射问题上的理论及应用；并给出了运用边界元法分析软件求解振动声辐射问题的过程。阐述了有限元法和边界元法的耦合理论及组合分析方法，并以封闭鼓形薄壳为分析对象进行了相应的分析。利用数字计算软件编制了噪声数据模拟程序，并模拟了通过组合方法分析封闭鼓形薄壳瞬态响应声场而获得一关键点的声压数据，实现声音的可听化，随后通过虚拟现实工具实现了该情形下椭球壳振动噪声的虚拟仿真。
