筋板组合结构的中高频传声特性分析

发布时间：2018-10-17 18:45

【摘要】：筋板类结构以及由它组成的更为复杂的组合结构,在实际工程中有着极为广泛的应用,如：筋板组合结构被广泛地用作汽车、舰船、高速列车和航空航天飞行器等动力机械装备的外壳结构,以及各类室内建筑结构,其声振响应特性对于产品的整体声振品质有着至关重要的影响作用。筋板组合结构的声振响应问题不仅涉及国防安全,更与人们的日常生活息息相关。因此,筋板组合结构的声振响应作为一个非常重要的热门研究课题,一直以来受到力学界、声学界等众多学者的广泛关注和研究。在理论、仿真和实验上对这一课题进行持续深入的研究,在不同应用背景下对筋板组合结构的材料选择和设计提供必要的理论和技术支持,具有极为重要的理论和实际工程意义。 国内外学者对于板和筋板组合结构的声振特性研究工作一直在发展中,并取得了大量的研究成果,部分成果已成功应用于工程实际。然而由于筋板组合结构在中高频域存在着局部短波变形和整体长波变形并存的复杂运动耦合形式,迄今尚未形成一套成熟、规范、系统的建模方法来准确、合理地对于复杂筋板结构的声振特性进行分析预测。本文旨在从振动响应和隔声分析两方面,从简单筋板组合结构的中高频声振特性预测分析出发,结合实际工程中的常用筋板组合结构,从建模实用性的角度,对于筋板组合结构的中高频声振建模进行进一步的仿真和实验探讨,研究结果尤其对于应用国际最先进的声振分析软件VA One进行隔声量的建模和计算方面具有直接的指导和借鉴作用。本文在国家自然科学基金“大型复杂组合系统参数不定性动态影响的量化研究”(51175300/E050303)和山东省自然科学基金“工程肋板结构的近高频振动特征及噪声传递特性研究”(ZR2011EEM009)资助下完成。 本文主要工作和结论如下： (1)进行梁板结构的振动响应和传声特性仿真建模,并结合理论与实验结果分析。 (2)对典型中频筋板组合结构进行声振特性分析,确定各个结构在不同振动频域振动特性不同的情况下,应用不同建模方法的有效性。具体包括：建立包含一个板和一个梁的梁板耦合模型,通过实验测得其频响函数及隔声量。由于设计使其动态特性差异显著,即为典型中频结构模型,用VA-One中Hybrid模块进行仿真,并与传统有限元方法及统计能量法结果进行对比,得出中频段划分方法。通过对Hybrid混合模型法在简单结构应用时的观察,为复杂工程结构建模时累积经验教训； (3)实际工程中复杂筋板组合结构的声振响应建模、仿真和实验分析,具体包括：铝型材(波纹板)结构的隔声量分析和联合农用收割机的司机室噪声分析。对于波纹板结构的中高频隔声分析提出了实际有效的建模方法。尤其对于波纹板结构的子系统划分方式与其建模有效性之间的影响关系进行了探讨。通过复杂工程筋板结构波纹板与司机室的建模对比,对Hybrid建模方法提出了一个更为明确的有效区域划分,说明了Hybrid建模方法的应用局限性。
[Abstract]:The structure of the rib plate and the more complicated combination structure composed of the same are widely used in the practical engineering, such as: the rib plate combination structure is widely used as the shell structure of equipment such as automobiles, ships, high-speed trains and aerospace vehicles and the like, As well as various indoor building structures, the acoustic vibration response characteristic plays an important role in the overall sound vibration quality of the product. The problem of acoustic vibration response of rib plate combined structure is not only related to national defense security, but also closely related to people's daily life. Therefore, the acoustic vibration response of the rib plate composite structure is a very important hot research topic, and has been widely concerned and studied by many scholars, such as the mechanics field and the acoustic field. In theory, simulation and experiment, this topic carries on in-depth research, providing necessary theory and technical support for material selection and design of rib plate combination structure under different application background, and has extremely important theory and practical engineering significance. At home and abroad, the research on acoustic vibration characteristics of plate and rib plate composite structure has been developing, and a great deal of research results have been obtained. Some achievements have been successfully applied in engineering However, because of the complex motion coupling form of local short wave deformation and overall long wave deformation in middle and high frequency domain, a set of mature, specification and system modeling methods have not been developed to date. Accurate and reasonable analysis of acoustic vibration characteristics of complex rib plate structure The purpose of this paper is to analyze two aspects of vibration response and sound insulation analysis. Based on the prediction and analysis of high-frequency acoustic vibration characteristics of simple rib plate composite structure, this paper presents the practical application of the combined structure of common rib plate in practical engineering. From the viewpoint of further simulation and experiment on the middle and high frequency acoustic vibration modeling of the rib plate composite structure, the research results have direct guidance and reference for the modeling and calculation of the sound insulation quantity by using the internationally most advanced acoustic vibration analysis software VA One. Function. This article is supported by National Natural Science Foundation 鈥淨uantitative Study on the Dynamic Effect of the Parameters of Large Complex Combination System鈥，

本文编号：2277613