【标题】A Hybrid Acoustic Model for Composite Materials Composed of Fibers and High Surface Area Particles

【参考中译】纤维/高比表面积颗粒复合材料的混合声学模型

【类型】 会议

【作者】 Zhuang Mo; Tongyang Shi; Seungkyu Lee; Yongbeom Seo; J. Stuart Bolton

【摘要】 High surface area particles have drawn attention in the context of noise control due to their good sound absorption performance at low frequencies, which is an advantage compared with more traditional materials. That observation suggests that there is a good potential to use these particles in various scenarios, especially where low frequency noise is the main concern. To facilitate their application, composite materials are formed by dispersing particles within a fiber matrix, thus giving more flexibility in positioning those particles. In this work, a hybrid model that combines a model for limp porous materials and a model of high surface area particles is proposed to describe the acoustic performance of such composites. Two-microphone standing wave tube test results for several types of composites with different thickness, basis weight, and particle concentration are provided. An optimization procedure based on the particle swarm algorithm is introduced to identify the input parameters of the proposed model by minimizing the difference between measured and predicted absorption coefficients. Comparisons between the model predictions made using the optimized parameters and the measurements are shown in this paper, which demonstrates that the proposed model can predict the acoustic performance of the composites with reasonable input parameters.

【参考中译】 高比表面积颗粒由于其在低频下良好的吸声性能而在噪声控制方面引起了人们的关注，这与更传统的材料相比是一个优势。这一观察表明，在各种情况下使用这些颗粒是很有潜力的，特别是在低频噪音是主要担忧的情况下。为了方便它们的应用，复合材料是通过将颗粒分散在纤维基质中形成的，从而在定位这些颗粒时提供了更大的灵活性。在这项工作中，提出了一种混合模型来描述这种复合材料的声学性能，该模型结合了软弱多孔材料模型和高比表面积颗粒模型。给出了几种不同厚度、不同定量和不同颗粒浓度的复合材料的双传声器驻波管测试结果。提出了一种基于粒子群算法的优化算法，通过最小化模型的实测值和预测值之间的差异来辨识模型的输入参数。将优化后的模型预测结果与实测值进行了比较，结果表明，在合理输入参数的情况下，该模型可以预测复合材料的声学性能。

【来源】 2021 SAE Noise and Vibration Conference & Exhibition 2021 SAE Noise and Vibration Conference & Exhibition

【入库时间】 2023/2/27

【标题】Chapter 5 Damage and Failure of Composite Materials

【参考中译】第五章复合材料的损伤与失效

【类型】 会议

【作者】 Ramesh Talreja

【摘要】 This article is a summary of six lectures given by the author at the webinar, "Advanced Theories for Deformation, Damage and Failure in Materials" organized by the International Centre for Mechanical Sciences, Udine, Italy, May 3-7, 2021. The topics of the lectures dealt with mechanisms of damage and failure, continuum and synergistic damage mechanics, failure theories for anisotropic homogenized solids, and physical modeling of failure in composites containing manufacturing defects. Finally, future research directions were discussed. An attempt is made here to bring together those topics in a coherent manner to provide a comprehensive exposition of the field of damage and failure in composite materials.

【参考中译】 本文是作者在2021年5月3日至7日在意大利乌迪内国际机械科学中心举办的网络研讨会上所做的六次演讲的摘要，该研讨会的主题是《材料变形、损伤和失效的先进理论》。讲座的主题涉及损伤和失效的机制、连续和协同损伤力学、各向异性均匀固体的失效理论，以及含有制造缺陷的复合材料的失效的物理模型。最后，对未来的研究方向进行了展望。这里试图以连贯的方式将这些主题结合在一起，以全面阐述复合材料中的损伤和失效领域。

【来源】 Advanced Theories for Deformation, Damage and Failure in Materials

【入库时间】 2023/2/27

【标题】Design and Analysis of Composite Materials for Vehicle Engine Mount

【参考中译】汽车发动机悬置复合材料的设计与分析

【类型】 会议

【关键词】 Design of engine mounts; Analysis of engine mounts; Carbon fiber epoxy resin composite; PUGH method comparison; Alternative to polyurethane mounts

【参考中译】 发动机悬置的设计.发动机悬置的分析.碳纤维环氧树脂复合材料.Pugh方法比较.替代聚亚安酯悬置

【作者】 A. R. Abd Hamid; T. M. Chin

【摘要】 This article will aim to replace rubber in engine mounts with alternative materials, preferably composites. The engine mount is the most important component of a vehicle's engine; its job is to isolate and absorb engine vibrations. As a result, the engine mount is subjected to high stresses and adverse conditions. For example, high temperatures, chemical leaks, vibrations, and the engine's mechanical torque. Rubber has a lower life duration when all aspects are considered. As a result, many researchers have tried to extend the mount's lifespan. The purpose of this paper is to demonstrate this. To extend the mount's life and increase performance by decreasing power dissipation without sacrificing comfort, a combination of creative ideas and materials are combined. As a result, expect a stiffer and more durable mount. Three different materials are used to compare three different conceptual designs. Rubber, Polyurethane, and Carbon Fiber-Epoxy Resins are utilized in the Pugh technique to identify the optimal mix of conceptual ideas and materials. To identify the final combination, many analyses are performed, including structural analysis, random vibration analysis, explicit analysis, static deflection, and mount weight (Design 2 with CF-EP). Despite the fact that PU and CF-EP are equivalent, CF-EP warrants further investigation and testing because there is still room for development.

【参考中译】 本文的目标是用替代材料，尤其是复合材料来取代发动机悬置中的橡胶。发动机悬置是汽车发动机最重要的部件，它的工作是隔离和吸收发动机振动。因此，发动机悬置受到高应力和不利条件的影响。例如，高温、化学物质泄漏、振动和发动机的机械扭矩。综合考虑，橡胶的使用寿命较短。因此，许多研究人员试图延长坐骑的寿命。本文的目的就是论证这一点。为了延长支架的寿命，在不牺牲舒适性的情况下通过降低功耗来提高性能，结合了创造性的想法和材料。因此，预计会有更坚固和更耐用的安装。三种不同的材料被用来比较三种不同的概念设计。在Pugh技术中，橡胶、聚氨酯和碳纤维-环氧树脂被用来确定概念想法和材料的最佳组合。为了确定最终的组合，进行了许多分析，包括结构分析、随机振动分析、显式分析、静态挠度和安装重量(带CF-EP的设计2)。尽管PU和CF-EP是等价的，但CF-EP仍有发展空间，值得进一步研究和测试。

【来源】 Technological Advancement in Mechanical and Automotive Engineering 6th International Conference on Mechanical Engineering Research (ICMER 2021)

【入库时间】 2023/2/27