【作者】 李晓政；

【导师】 黄其柏；

【作者基本信息】 华中科技大学 ， 机械设计及理论， 2005， 硕士

【摘要】 统计能量分析(SEA)理论是20 世纪50 年代末及60 年代初,航空航天高新技术的高速发展下,声振环境预示技术的又一个新突破。它是一种模化分析方法,通过运用能量流关系式对复合的、谐振的组装结构进行动力特性、振动响应级及声辐射的理论评估,从而获得在时间上和空间上的统计特性和声振性能。已广泛应用于铁路交通、土木建筑、舰船及机械制造等行业中。本文阐述了基于统计能量分析的车辆噪声分析中子系统划分的工程依据,详尽分析了车辆室内声空间子系统与车身板壳子系统的建立过程,总结了在Auto SEA 软件中建立子系统模型时需要注意的有关子系统间的耦合关系等问题的处理方法。对降噪原理中的隔声与吸声降噪方法进行了系统的研究,将其与非单一结构等透声量设计原则相结合,提出了应用Auto SEA 软件进行隔声量计算,应用Mat lab 软件计算构件的透声度系数,从而找到车辆室内降噪的薄弱环节的思想。对车辆室内外声场进行现场测试、分析,进行多种Auto SEA 车辆子系统模型的仿真分析比较; 使用Auto SEA 软件计算各个子系统间的能量流动,应用等透声量设计原则,找出车辆室内降噪的薄弱点。针对车辆降噪的薄弱环节,应用正交优化设计的方法,建立降噪仿真的正交优化设计表,并对优化设计表进行计算。将得到的降噪优化设计结果在车辆仿真模型中应用。降噪结果说明,正交优化设计方法可以得到比较满意的结果。总结本课题所作的各方面工作,阐述本课题在理论与实践应用中的不足,提出了未来在基于统计能量分析的车辆噪声仿真设计方面还需继续的有关工作。更多还原

【Abstract】 The theory of Statistical Energy Analysis is a new breakthrough in the technique of prefiguring the vibro-acoustic environments that was developed at the end of the fifties to sixties in the 20th century when the new technique on aviation and spaceflight speeded up. It’s a kind of module analysis method which can evaluate the dynamic characteristic, vibration response level and sound radiation of the complex and resonance assembly structures theoretically through the relation formula about energy flows, then the statistical feature and the acoustic characters in space and time can be obtained. The theory had been used broadly in the areas such as railway transports, building architectures, naval ship and mechanical manufactures. This thesis explains the engineering rule how to establish a vehicle noise analysis system based on the Statistical Energy Analysis theory, the constitution of the sub-systems which are composed of the sound-spaces inner vehicle and the plate-shells outside vehicle, and summarizes how to deal with the coupled relationships between the sub-systems in the software-Auto SEA when the model is erected. The methods used in the sound insulation and sound absorption about the noise control are studied. According to the principle of Equal Sound Penetrate Degree used in the composite structures, the method to find out the weak point in controlling the vehicle inner noise is brought forward, such as calculation of the sound insulation quantities using the software Auto SEA and obtaining of the sound pass-through degree using the software MatLab. The bigger the degree is, the weaker the sub-system is. In order to get a good model that can be used to evaluate the inner vehicle noises, the spot test is carried out, then is applied on the models made already. Using software Auto SEA to calculate the energy flow between the sub-systems and under the Equal Penetration Sound Degree rule, the weak points of vehicle inner noise control are found out. Applying the Experimental Optimization Design method to the weak points of vehicle inner noise control, the orthorhombic experiment design charts are founded and the penetrated sound degree coefficients are calculated. From the results of the charts, the optimal factors are selected and applied to the vehicle model. The noise optimal results sound well. The task that have been accomplished is summarized, the matter that had been done deficiently is expounded, and the work about the vehicle inner noise control, imitation and design based on the Statistical Energy Analysis theory just started in china, there are still much work to be done.更多还原