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71.
为促进木结构建筑减振降噪研究,以一栋普通轻型木结构建筑和一栋葡萄牙软木优化轻型木结构建筑为研究对象,采用瞬态激励法和现场声压级法,分别测试两栋建筑的动力参数(频率、峰值加速度、阻尼比)和隔声量,并进行相关分析。结果表明:两种轻型木结构建筑均符合舒适度要求,同时软木优化轻型木结构建筑的平均阻尼比比普通轻型木结构建筑高1.6%;在关闭门窗,交通噪声源和扬声器噪声源共同作用情况下,软木优化结构建筑的平均隔声量比普通结构高4.6 dB(A);其中软木优化结构的减振降噪性能好于普通轻型木结构建筑,可以明显改善木结构建筑楼盖振动特性和隔声效果。上述以期为轻型木结构建筑的减振降噪优化设计工作提供技术支撑,具有工程应用价值。 相似文献
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This paper argues that research into the wellbeing and restorative effects of green spaces has been conducted in what might be described as a modal vacuum. Whilst it is commonly recognised that the outdoor world is one in which our visual, aural, haptic and olfactory senses are engaged, much environmental psychological research into this topic has been conducted using the visual sense only. We present a methodological overview of research that has been conducted either in situ or in conjunction with other modes (primarily aural), and highlight research findings from other disciplines that contributes to our understanding of greenspace wellbeing benefits. Lastly, we outline a research approach that we believe could uncover some of the underlying mechanisms of wellbeing benefits from greenspace. We contend that the use of eyetracking, in conjunction with the presentation of sound as well as visual stimuli, could help unpick the complexities of what exactly it is about certain environments that makes them restorative or not. 相似文献
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针对锤击法装配弹性销易出现装配质量差和安全环保事故等问题,运用新型勾爪液压工装将弹性销压入销孔,新工艺方法既减小了拨叉轴变形,又提高了装配安全性,有一定推广应用价值。 相似文献
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针对发动机燃爆信息的非平稳性,利用声强近场测量和小波包多分辨率分析的特点,提出了一种基于小波包分析的声强算法,本文利用该方法对某型号发动机燃爆信息的特征提取进行了实验研究。实验结果表明,该方法可以从复杂的发动机缸盖辐射噪声中提取出燃爆信息,所提取的燃爆信息可作为发动机单缸失火的故障诊断指标。本文所提出的基于小波包分析的声强算法为汽车发动机运行状态的在线监测和故障诊断提供了一种有效的手段。 相似文献
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Yingcheng Hu Tetsuya Nakao Takahisa Nakai Jiyou Gu Fenghu Wang 《Journal of Wood Science》2005,51(1):13-17
Wood plastic plywood (WPPW), composed of veneer and styrofoam, was manufactured without special adhesives such as urea–formaldehyde or phenol–formaldehyde resins, and its vibrational properties were investigated. WPPW can be produced at 1MPa and 160°C for 9min (three-ply) and 12min (five-ply). The dynamic Youngs modulus reached its highest value when the styrofoam thickness was 30mm. The sound velocity and dynamic Youngs modulus had minimum values at a grain angle of 45°. The results for dynamic Youngs moduli measured by a longitudinal vibration method and an in-plane flexural vibration method were almost the same. Dynamic shear moduli were measured by an in-plane surface wave propagation test and an in-plane flexural vibration method. From the experimental results, the dynamic shear moduli at 0° and 90° by the two methods were relatively close, although the surface wave propagation test results were higher than those from the flexural vibration method. Dynamic shear moduli at a grain angle of 45° measured by the in-plane surface wave propagation test and calculated from theory were relatively close. The surface wave propagation test results were smaller than the results calculated from theory. The shear stress distribution factors were about 1.000–1.189 for WPPW. 相似文献