声学

The finite element models of an engine block, oil pan, valve cover and gear cover were established by using the ANSYS software, and the calculation results were validated by the test results.

无论采用何种燃油供给系统和燃烧方式，都有必要对柴油机表面的振动特性和声学特性规律进行研究，在噪声向外传递的途径上最大限度地控制噪声水平。

Wavelet packet decomposition; statistical characteristic analysis; normal distribution; mechanical vibration; trolley track

工程科技II，工业通用技术及设备，声学工程小波包分解；特征参数；正态分布；机械振动；岸桥小车轨道

First of all, principle and computing of measuring sound transmission loss.

第一，声学材料隔声量测量的原理及计算。

Second, developing the sound transmission loss measuring system.

第二，声学材料隔声量测量系统的构建及测量。

Simulation results show that the method solves dynamical product of HRTF data based on moving sound sources and the smooth transition of the fore-and-aft sound sequence signals. The method is more reliable and accurate than other methods, and realizes indoor acoustic simulation based on dynamic mechanism.

仿真结果表明，该方法较好地解决了运动声源HRTF数据的动态产生和前后声信号段平滑过渡问题，具有更好的真实性和精确度，实现了基于动态机制的室内声学仿真方法。

Simulation results show that the method solves dynamical product of HRTF data based on moving sound sources and the smooth transition of the fore-and-aft sound sequence signals.

仿真结果表明，该方法较好地解决了运动声源HRTF数据的动态产生和前后声信号段平滑过渡问题，具有更好的真实性和精确度，实现了基于动态机制的室内声学仿真方法。

But experiments show that not all the intensity of the neutral tone get weaker, just the energe of the neutral tone word s last part gets weaker than the ordinary word. Experiments also show, it is the voice-pitch and voice-length that make the neutral tone syllable indistinct.

关于轻声的声学性质，我们往往认为轻声是音强特别弱，有关实验结果表明，轻声的音强并不是全都减弱，但轻声词后字的能量毫无例外地都比普通&中重&格式的词的后字的能量减弱。

Study on flashover of suspension insulator string caused by windage yaw in 500kV transmission lines.

王声学，吴广宁，范建斌，等。500 kV输电线路悬垂绝缘子串风偏闪络的研究。

Equivalent stretch elastic modulus E,sound reflection R and transmission coefficient T are calculated by the method of equivalent stiffness and transfer matrix separately.

通过试验获取了碳纤维、凯夫拉纤维、玻璃纤维、超高分子量聚乙烯纤维复合材料的力学性能和声学性能参数，在此基础上分别利用等效刚度法和传递矩阵法，对CF/UHMPEF、CF/KF、CF/GF混杂纤维复合材料的拉伸刚度、声反射系数和声透射系数进行计算。

A pop-science writer who has made Einstein, acoustics and meteorology intelligible to the right-brained, Levenson transforms inflation and metallurgy into a suspenseful detective story bolstered by an eloquent summary of Newtonian physics and stomach-turning descriptions of prison life in the Tower of London.

一个弹出科学作家谁已成为一个悬疑侦探由牛顿物理学和胃转折点，塔监狱生活的描述有力地带动摘要爱因斯坦的故事，声学，气象学理解的右脑，李文森变换通货膨胀和冶金伦敦。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。