Recommendations for the presentation of plastics design data - other properties - acoustical properties mechanical damping capacity 塑料设计数据表示方法推荐标准.第5部分:其它特性.第4节:声学特性
There were a series of special acoustic changes in budgerigar and psittacula agapornis " vocal after the section of nxiits 亚鸣禽虎皮鹦鹉及牡丹鹦鹉在断nxllts后其叫声的声学特性出现了一些特殊的变化。
Acoustics assistant designing has been an effective way to improve structure with acquaintance of its acoustical character 声学辅助设计已成为改进结构声学性能的一种有效方法，实现该方法的前提是对结构声学特性的掌握。
Prosody . models of speech planning ; evidence from speech errors . modification of features and acoustic properties in fluent speech ; gestural overlap , reduction , enhancement 18韵律学。语言规划模型。语言错误的实证。特征系数的改变和流畅语言中的声学特性。姿态的重叠、简化和加强。
Taking two report halls for example , the train of thought as well as calculation results was presented for sound field design by cad , including analysis of the acoustics characteristic of audience field 以二个报告厅为例，介绍了声场计算机辅助设计的设计思路和计算结果，并对观众席的声学特性进行了分析。
The reasonable way of the acoustics design in the structure is to consider the acoustics characteristic of the structure in the forepart , and make acoustics characteristic and other characteristics all are in good way 结构声学设计技术研究的就是在结构设计的开始阶段就将结构的声学特性考虑在内，从而实现结构使用的有效性和声学特性之间的最佳组合。
In view of that the plane wave theory is suitable only in lower frequency range , the three - dimensional finite element method is applied to analyze the acoustic characteristics of air cleaner in the present study for broadening the frequency range 由于一维平面波理论只适于低频分析，为了扩大分析的频率范围，采用了三维有限元数值方法分析空气滤清器的声学特性。
Best test regions are confirmed to found the acoustic emission test method for valve leakage . the large amount of data collected also allowed a brief investigation of the effects of different opening , valve types , differential pressure and leakage rates 根据本次研究工作的目的和特点并结合现场的实际情况，探讨了内漏时阀门开度、阀门类型、两侧压差以及泄漏率等因素变化时的声学特性。
Noise control can be well actualized with understanding of the acoustics characters of thin plate , cylindrical shell , stiffened plate and stiffened shell in liquid medium , which are the most common structure of car , aircraft and ship 薄板、圆柱壳、加筋板、加肋圆柱壳是汽车、轮船、飞机等交通工具中的结构组织形式，了解他们在流体介质中的声学特性有助于对他们实施有效的减振降噪措施。
Considering the filter paper as the sound - absorbing material , the filter paper is then taken into account in the analysis of the air cleaner , in which the acoustic characteristics of the filter paper is modeled with the empirical expressions of fibrous materials 同时，空气滤清器中的滤纸大多是纤维材料，可以作为吸声材料来处理，所以在考虑滤纸的情况下分析空气滤清器的消声性能，其中以纤维吸声材料的经验公式来模拟滤纸的声学特性。
