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1.
音乐厅音质设计进展述评   总被引:6,自引:0,他引:6       下载免费PDF全文
王季卿 《应用声学》2003,22(1):1-7,34
本文对近年来音乐厅音质设计中若干问题的进展作一述评。(1)在已建立的众多独立音质参量基础上,如何作出大厅综合评价,就需要考虑到它们的互动性和贡献权,方法学将成为关键。(2)空间感已确认由声源视在展宽度ASW和听者环绕感LEV组成,对于影响两者的诸多复杂因素有了较深入研究,这声场中的细节又将如何与大厅设计相联系亦备受关注。(3)听众及座椅吸声这个老问题有了新的研究成果,对于空、满场的声学关系已积累了更多资料,使大厅音质的估算更为精确可靠。(4)常说扩散对大厅音质很重要,但其主观效应仍然处于玄虚状态,一些新的主观试听实验结果还不足以说明问题。  相似文献
2.
有限元法可用于以声波动方程为基础通过数值计算求解室内声场,适用于分析界面阻抗非均匀分布和复杂形状房间内声场的低频特性。本文首先介绍了小阻尼界面条件下室内声场简正方式、声衰变系数、混响时间的FEM计算方法。在此基础上导出了房间内两点之间声传输函数和声脉冲响应函数的FEM计算模型,并以矩形房间为例详细讨论了有关细节。本文所讨论的计算模型可以映房间内不同的声源点,接收点位置上的声压频谱特性和脉冲响应的时  相似文献
3.
厅堂中总声压级的修正计算   总被引:2,自引:0,他引:2       下载免费PDF全文
完全扩散声场中的总声压级计算公式是假设混响声能在厅堂中的分布各处相等,与接收点的位置无关,实测发现该公式的计算值偏高,特别当接收点在临界距离以外时,本文提出了一个总声压级计算的修正公式,它与实测及计算机模拟的值符合较好。  相似文献
4.
时域有限差分法在建筑声学中的应用及前景   总被引:1,自引:1,他引:0       下载免费PDF全文
卢义刚  杨启洪 《应用声学》2006,25(3):193-197
介绍了声波方程的基本差分格式及稳定条件、数值色散、吸收边界条件等数值计算理论,例举了前人用时域有限差分法对噪声传播过程的模拟和室内声学中座椅吸声低谷效应模拟的模拟结果。本文指出,由于时域有限差分法的特点使其具有在模拟脉冲响应方而的特别优势,因而,应用这一技术研究厅堂的声学特性,尤其是低频特性,将有重要意义。  相似文献
5.
厅堂声学一百周年(1895—1994)   总被引:1,自引:0,他引:1       下载免费PDF全文
吴硕贤 《应用声学》1995,14(2):7-12
本文介绍自W.C.Sabine以来100年厅堂声学的发展简史,包括室内声学理论,音指标与评价,声学测试方法,缩尺模型技术,计算机仿真技术及厅堂设计的发展,现状及关于今后研究方向的前瞻。  相似文献
6.
室内声学时域有限差分模拟中的边界条件   总被引:1,自引:1,他引:0       下载免费PDF全文
给出了时域有限差分法用于室内声学问题模拟中的边界条件,结合声波方程的基本差分格式,模拟并分析了高斯脉冲在4m×4m房间中的波动过程和脉冲响应;模拟了一9m×6m×4m房间的简正频率,并与经典理论计算值进行了对比;模拟了一12m×5m×4m水平地面房间中的坐席吸声低谷效应,并与Joe LoVtri的模拟结果进行了对比;模拟并实际测量了一10.6m×5.8m×3.4m房间在几个受声点的脉冲响应和早期衰变时间EDT,将模拟结果与实际测量结果进行了对比分析,计算程序是用Metlab语言编写的。模拟与经典理论、相关研究、实际测量几方面的对比分析,验证了本边界条件的可靠性。  相似文献
7.
I.IntroductionLoudnessisoneofthedistinguishingcharactcristicsamonga1lacousticcriteriainauditori-umdesign.Insufficientorsevcrcunevendistributionofloudncsscausesseriousdeficiencytoauditoriumacoustics.Duetothelackofappropriateparamcter,thereisnowayeithertopre-dictloudnessinanauditoriumduringthedcsignstagc,ortochccktheactua1effectafterthecomp1etionoftheconstruction.Wca1lmighthavethcexpcricnccasanaudiencethatthestagcattractedmoreofourcon-ccntrationduringthesoftpassagcofthcpcrformance,whercaswewcre…  相似文献
8.
The classical normal-mode theory expresses the steady-state soundfield in an enclosure produced by a sound source as a series of normal modes ofvibration.Experimental facts are not often explained by this theory,and it wasconjectured that the normal-mode expression is not the complete solution ofthe wave equation in the enclosure,but only the reverberant part of it,and thereshould be an additional term representing the direct spherical radiation to makethe solution complete.The problem is examined by critically reviewing the de-rivation of the normal-mode expression,and by theoretical analysis of thesteady-state sound field in the room and experimental measurements therein.The conjecture is thus confirmed,and it is definitely shown that the sound fieldshould contain the direct wave as well as the standing waves(normal modes)formed by the confinement of the boundary surfaces.Relevant mathematicalexpressions are derived.  相似文献
9.
Two room acoustical simulation software have been used to predict the main acoustic parameters of a Symphony Hall in the planning stage, when only drawings were available. The modelled room is the Symphony Hall of the Conference Hall of Navarre, in Pamplona, Spain. Although the values of the calculation parameters (number of rays, reflection order, etc.) recommended by each software are slightly different, in this work the same values were used for both programs. Once the Hall was built, experimental results were obtained using the MLS-measurement technique. The values predicted and measured for several parameters defined in ISO 3382 at 9 receiver positions are compared. Even though the values predicted by both software are very similar for most of the acoustic parameters, there are notable differences at particular values, mainly when evaluating energy ratios. Different statistical corrections for late reflections between both programs seem to be the main reason for these differences. A more exhaustive knowledge of scattering coefficients is required to improve predictive accuracy. Important differences at 250 Hz frequency band were found between calculated and measured values probably due to the yet to be implemented seat dip effect in room simulation software. The comparison of calculated and measured impulse responses seems to be the first choice for the assessment of room simulation software. However, it should be kept in mind that its usability is also determined by many additional features. This work is not only a comparison of software dealing with the same object as well as equal input data but also shows the power of this kind of tool to predict the acoustic parameters of a room before its construction.  相似文献
10.
To predict acoustics of rooms using computer programs based on geometrical assumptions, it is important that scattering is included in the calculations. Therefore scattering is usually included in terms of scattering coefficients which are assigned to each surface telling the software the ratio between the part of the reflected energy which is not being reflected specularily and the total reflected energy. However the effective scattering coefficient of a surface depends not only on the roughness of the surface material indeed diffraction caused by limited dimensions of the surface as well as edge diffraction also causes scattering. For complex rooms it can be difficult to give a reasonable estimate to the magnitudes of scattering coefficients if these should also include diffraction and even if these frequency dependent coefficients could be obtained in the design phase, the processes of obtaining the data becomes quite time consuming thus increasing the cost of design. In this paper, practical methods to define scattering coefficients, which is based on an approach of modeling surface scattering and scattering caused by limited size of surface as well as edge diffraction are presented. The predicted and measured acoustic parameters in real rooms have been compared in order to verify the practical approaches recommended in the paper.  相似文献
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