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Light rail wheel/rail noise radiation model using a coupled FE-BE method 基于FE-BE耦合方法的轻轨轮轨噪声辐射模型
IF 0.7 4区 医学 Q3 Medicine Pub Date : 2023-05-25 DOI: 10.3397/nc_2023_0137
C. Layman, J. Nelson
This paper presents the development of a coupled finite element - boundary element model of rolling noise from a resilient light rail wheel on several types of tracks. The vibro-acoustic model utilizes a 3D elastic solid representation for both wheel and rail which are excited by linearized Hertzian interface loads. Estimates of the radiated sound power, radiation efficiencies and wayside noise levels are obtained and then scaled using a parallel impedance framework and a roughness profile. Results are compared to recently measured vehicle passby noise and track decay rates at Sound Transit in Seattle Washington.
本文建立了弹性轻轨车轮在几种轨道上滚动噪声的有限元-边界元耦合模型。振动声模型采用三维弹性实体表示车轮和轨道受线性赫兹界面载荷的激励。获得辐射声功率、辐射效率和路旁噪声水平的估计,然后使用平行阻抗框架和粗糙度剖面进行缩放。将结果与最近测量的华盛顿州西雅图Sound Transit的车辆经过噪音和轨道衰减率进行比较。
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引用次数: 0
Prediction of sound radiation using reconstructed acoustic free velocity sources 利用重建声自由速度源预测声辐射
IF 0.7 4区 医学 Q3 Medicine Pub Date : 2023-05-25 DOI: 10.3397/nc_2023_0057
Xin Yan, D. Herrin
A complicated source can be represented by a series of acoustic free velocity sources. The sound pressure at a position in the field can be predicted by summing the products of the acoustic free velocity source strengths and their respective transfer functions. These transfer functions relate the sound pressure in the field to the acoustic source strength. In this research, the sound pressure is measured at positions in the free field and then is used to determine the acoustic free velocity source strengths via an inverse method. The approach is applied to characterize a laboratory source with high directivity. It is then demonstrated that the sources can be used to predict the insertion loss of a barrier introduced to block the source from the receiver.
一个复杂的声源可以用一系列自由声速声源来表示。声场中某一位置的声压可以通过声源自由声速强度及其各自传递函数的乘积和来预测。这些传递函数将声场中的声压与声源强度联系起来。在本研究中,在自由场位置测量声压,然后通过反求法确定声自由速度源强度。将该方法应用于具有高指向性的实验室源的表征。然后证明了源可以用来预测引入的阻挡源与接收器的屏障的插入损耗。
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引用次数: 0
Evaluation and mitigation of outdoor live music 户外现场音乐的评估和缓解
IF 0.7 4区 医学 Q3 Medicine Pub Date : 2023-05-25 DOI: 10.3397/nc_2023_0078
H. Singleton
Live music is hosted at many small restaurants and breweries as a means for attracting customers and helping to expose patrons to local bands. Outdoor live music, especially during warm spring and summer seasons provides flexibility for venues in terms of seating capacity, patron comfort, and the integration of natural scenery. However, sound from outdoor entertainment can be a vexing problem for the surrounding community, especially for late evening and nighttime performances. In response to community concerns, outdoor live music venues located in three different communities (rural, small town urban, and waterfront) were each required to provide in-situ demonstrations to assess the effect of outdoor music on nearby homes. The effectiveness of these demonstrations, along with an analysis of mitigation measures, is discussed.
许多小餐馆和啤酒厂都会举办现场音乐会,作为吸引顾客和帮助顾客了解当地乐队的一种手段。室外现场音乐,特别是在温暖的春夏季节,为场地的座位容量、顾客舒适度和自然景观的融合提供了灵活性。然而,户外娱乐的声音对周围的社区来说可能是一个令人烦恼的问题,尤其是对深夜和夜间表演。为了回应社区的关注,位于三个不同社区(农村、小城镇、城市和海滨)的户外现场音乐场所都需要提供现场演示,以评估户外音乐对附近家庭的影响。讨论了这些示范的有效性,并对缓解措施进行了分析。
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引用次数: 0
Tradeoff between mass sensitivity and performance in quasi-zero stiffness vibration isolators 准零刚度隔振器质量灵敏度与性能的权衡
IF 0.7 4区 医学 Q3 Medicine Pub Date : 2023-05-25 DOI: 10.3397/nc_2023_0139
P. Gilmore, U. Gandhi, S. M. S. Shaihan, R. Rangarajan
Quasi-zero stiffness isolators are a promising technology to reduce vibration transmission over a large frequency range while maintaining passive operation and low cost. Many different types of QZS isolators have been demonstrated utilizing a variety of mechanical, pneumatic, and magnetic components. While some of these types have their own unique challenges, other challenges are more general. Two of these challenges are mass sensitivity and hysteresis in the load-deflection curve caused by snap-through buckling, friction, or structural damping. This work investigates the impact of force-deflection hysteresis on isolation performance through experimental techniques. Results show that increasing hysteresis reduces the mass sensitivity but worsens the isolation performance at low frequencies. A tradeoff must be made between these two aspects but can be overcome by shifting the QZS region to difference forces. A simple method to achieve this adaptability exists for certain types of QZS structures, therefore enabling a variety of practical applications within a certain design window.
准零刚度隔振器是一种很有前途的技术,可以在大频率范围内减少振动传输,同时保持被动运行和低成本。许多不同类型的QZS隔离器已被证明利用各种机械,气动和磁性元件。虽然其中一些类型有自己独特的挑战,但其他挑战更为普遍。其中两个挑战是质量敏感性和负载-挠度曲线中的滞后,这是由屈曲、摩擦或结构阻尼引起的。本文通过实验技术研究了力-挠度滞回对隔振性能的影响。结果表明,增大磁滞会降低质量灵敏度,但会使低频隔离性能恶化。必须在这两个方面之间进行权衡,但可以通过将QZS区域转移到不同的力来克服。对于某些类型的QZS结构,存在一种简单的方法来实现这种适应性,从而在一定的设计窗口内实现各种实际应用。
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引用次数: 0
Validation of utility and transportation noise modeling 验证公用事业和交通噪音模型
IF 0.7 4区 医学 Q3 Medicine Pub Date : 2023-05-25 DOI: 10.3397/nc_2023_0028
M. Conaway, Joseph A. Keefe
A few case studies regarding public utility and transportation noise are presented. These address concerns regarding the prediction and attenuation of noise from electrical transformers, gas regulators, and interstate highways. Our approach to computer modeling, model adjustments to match measured conditions, and before/after measurements will be presented.
提出了一些关于公用事业和交通噪声的案例研究。这些解决了有关电力变压器、气体调节器和州际公路噪声的预测和衰减的问题。我们将介绍计算机建模、模型调整以匹配测量条件以及测量前后的方法。
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引用次数: 0
Towards high-quality X-59 sonic thump measurements 迈向高品质的X-59音波测量
IF 0.7 4区 医学 Q3 Medicine Pub Date : 2023-05-25 DOI: 10.3397/nc_2023_0144
Mark C. Anderson, K. Gee, J. Durrant, A. Loubeau
Brigham Young University has been studying questions related to NASA X-59 community noise testing. A summary of the key findings and recommendations to date are presented. Among these are weather-resistant ground microphone setups that reduce wind noise, methods for treating the problem of ambient noise contamination on sonic boom metrics and spectra, and the turbulence-induced variability seen over relatively small-aperture arrays. Also discussed are recommendations for data post-processing, e.g., employing a digital pole-shifting filter and zero-padding to improve the fidelity and smoothness of low-frequency spectral data. Finally, the relative merits of various sonic boom metrics are considered. Although Perceived Level has been the most widely-used metric, it is relatively sensitive to ambient noise contamination and turbulence-induced variability. [Work supported by NASA Langley Research Center through the National Institute of Aerospace.]
杨百翰大学一直在研究与NASA X-59社区噪音测试相关的问题。本文概述了迄今为止的主要调查结果和建议。其中包括减少风噪声的耐天气地面麦克风装置,处理音爆指标和谱上的环境噪声污染问题的方法,以及在相对小孔径阵列上看到的湍流引起的变异性。还讨论了数据后处理的建议,例如,采用数字移极滤波器和零填充来提高低频频谱数据的保真度和平滑度。最后,讨论了各种音爆指标的相对优点。虽然感知水平是最广泛使用的度量,但它对环境噪声污染和湍流引起的变化相对敏感。[工作由NASA兰利研究中心通过国家航空航天研究所支持。]
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引用次数: 0
Vibration Isolation with Spring Supported Concrete Floating Floors on Fitness Centers 健身中心弹簧支撑混凝土浮动楼板隔振
IF 0.7 4区 医学 Q3 Medicine Pub Date : 2023-05-25 DOI: 10.3397/nc_2023_0090
Omer F. Tigli, M. Royvaran
Spring-supported concrete floating floors are often used as a high-end solution to mitigate noise and vibration disturbances in fitness centers. Suppliers of these floors typically provide impressive sound test results, but information regarding their low-frequency vibration isolation capabilities is scarce. In this study, the authors collected in-situ vibration data from an existing fitness center equipped with a 4-in (102-mm) thick spring-supported concrete floating floor while conducting various activities such as running on a treadmill, dropping a dumbbell, putting down a barbell and slamming a medicine ball on the floor. Frequency measurements revealed that entrapped air led to an increase in the natural frequency of the floating floor. The data demonstrated that floating slab effectively isolated noise and high-frequency vibrations, but was not able to isolate low-frequency vibrations. Additionally, a finite element model of the structure was developed, incorporating the floating floor and the base structural slab. The model was used to simulate treadmill running and weight drops, and calculated vibration levels were presented as heat maps across the entire floor. The model's predictions aligned closely with the actual measurements, demonstrating that vibration analysis based on finite element models is a valuable method to design effective mitigation strategies for fitness centers.
弹簧支撑的混凝土浮动地板经常被用作高端解决方案,以减轻健身中心的噪音和振动干扰。这些地板的供应商通常提供令人印象深刻的声音测试结果,但关于其低频隔振能力的信息很少。在这项研究中,作者从一个现有的健身中心收集了现场振动数据,该健身中心配备了一个4英寸(102毫米)厚的弹簧支撑混凝土浮动地板,同时进行了各种活动,如在跑步机上跑步,放下哑铃,放下杠铃和在地板上摔一个健身球。频率测量显示,被困的空气导致浮动地板的固有频率增加。结果表明,浮板能有效隔离噪声和高频振动,但不能有效隔离低频振动。此外,还建立了包含浮动楼板和基础结构板的结构有限元模型。该模型用于模拟跑步机的运行和体重下降,计算出的振动水平以整个楼层的热图形式呈现。该模型的预测与实际测量结果非常吻合,表明基于有限元模型的振动分析是设计健身中心有效缓解策略的一种有价值的方法。
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引用次数: 0
Air vent shape optimization with metamaterials. 利用超材料优化通风口形状。
IF 0.7 4区 医学 Q3 Medicine Pub Date : 2023-05-25 DOI: 10.3397/nc_2023_0111
Marco Lizotte, R. Panneton, J. Piaud
Heating, Ventilation and Air Conditioning (HVAC), are crucial in every building for the well being of the occupants. While these equipments take care of the air quality with exhausting polluted air out and bringing fresh air in, they can let a polluant in: noise. Noise can have non-physical effects like disturbed sleep, cognitive problems or even influences on heart diseases. Recent developments in the acoustic field shown the use of metamaterials that can reduce noise while keeping good ventilation. The sonic crystals, disposed in a certain pattern following the Bragg's law, can be tuned to reduce noise on a wide frequency band. The design of an air vent, known as a metacage, was made by using open source numerical simulations. Based on a numerical plan and optimization methods, this study's goal was to find the optimal solution for the HVAC to reduce noise while minimizing ventilation loss. Following the simulations results, the metacage generated was 3D printed for validation in the laboratory, showing the corroboration with the simulations. The final results show third-octave bands with a TL peak over 10dB and an average of 3dB for all the others bands up to 10kHz. All this while keeping minimal ventilation loss.
采暖、通风和空调(HVAC)对每个建筑物的居住者的健康至关重要。虽然这些设备通过将污染空气排出并引入新鲜空气来改善空气质量,但它们也会让污染物进入:噪音。噪音会产生非身体影响,比如睡眠紊乱、认知问题,甚至会影响心脏病。声学领域的最新发展表明,使用超材料可以在保持良好通风的同时降低噪音。按照布拉格定律以一定的模式排列的声波晶体可以调谐以减少宽频带上的噪声。一个通风口的设计,被称为元容器,是通过使用开源的数值模拟来完成的。基于数值规划和优化方法,本研究的目标是找到暖通空调的最佳解决方案,以降低噪音,同时最大限度地减少通风损失。根据模拟结果,将生成的元容器进行3D打印,并在实验室进行验证,结果与模拟结果相吻合。最后的结果表明,三倍频带的TL峰值超过10dB,其他所有波段的TL峰值平均为3dB,最高为10kHz。同时保持最小的通风损失。
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引用次数: 0
Frequency reduction and attenuation of the tire air cavity mode due to a porous lining 由于多孔衬里,轮胎气腔模式的频率降低和衰减
IF 0.7 4区 医学 Q3 Medicine Pub Date : 2023-05-25 DOI: 10.3397/nc_2023_0012
K. Choo, Wonhong Choi, Guochenhao Song, J. Bolton
The tire air cavity mode is known to be a significant source of vehicle structure-borne road noise near 200 Hz. A porous lining placed on the inner surface of a tire is an effective countermeasure to attenuate that resonance. The two noticeable effects of such a lining are the sound pressure attenuation and the frequency reduction of the air cavity mode. In this paper, through both analytical and numerical methods, the mechanism of the effects of porous lining was studied. A two-dimensional duct-shaped analytical model and a tire-shaped numerical model were built to investigate the lined tire in conjunction with the Johnson-Champoux-Allard model describing the visco-inertial dissipative effects of the porous material. Design parameters of the porous lining were controlled to study their impact and optimal ranges of the design parameters were suggested. Finally, in experimental analysis, the sound attenuation and the frequency drop were observed in measurements of force, acceleration, and sound pressure. In conclusion, it was demonstrated that the suggested analytical and numerical models successfully predict the effect of porous lining and that the frequency reduction results from the decreased sound speed within the tire owing to the presence of the liner.
众所周知,轮胎空腔模式是200赫兹附近车辆结构传播的道路噪声的重要来源。在轮胎的内表面放置多孔衬里是衰减这种共振的有效对策。这种衬里的两个显著效果是声压衰减和空腔模态的频率降低。本文采用解析和数值相结合的方法,对多孔衬砌的影响机理进行了研究。建立了二维管道型解析模型和轮胎型数值模型,并结合Johnson-Champoux-Allard模型描述了多孔材料的粘惯性耗散效应。对多孔衬砌的设计参数进行了控制,研究了它们对多孔衬砌的影响,并提出了设计参数的最佳范围。最后,在实验分析中,对力、加速度和声压的测量结果进行了声衰减和频率下降的观察。结果表明,所建立的解析模型和数值模型能够较好地预测多孔衬里的影响,而频率的降低是由于衬里的存在降低了轮胎内的声速。
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引用次数: 0
Sound attenuation by acoustic metamaterials applied to kitchen hoods 应用于厨房通风柜的声学超材料的声音衰减
IF 0.7 4区 医学 Q3 Medicine Pub Date : 2023-05-25 DOI: 10.3397/nc_2023_0044
Jeremy Plé, Tenon Charly Kone, Alla Eddine Benchikh Lehocine, R. Panneton
In a society where the vast majority of people spend their time inside buildings or vehicles, the need to filter the air is essential to ensure a certain level of comfort. The integration of air exchanger systems in these enclosed spaces generates noise pollution which can deteriorate the quality of the air. Thus, controlling the noise generated by these systems becomes a major challenge for the construction industry. Recent traditional solutions such as acoustic sonic crystals only allow high frequency noise control. One solution is the incorporation of inner structured acoustic materials for the control of low frequency transmission. This paper proposes a coupling of sonic crystals and structural acoustic materials for the control of sound transmission at low and high frequencies. To achieve this, research and simulations of the acoustic properties of various metamaterial models under the COMSOL software were established as well as a system of the selected solutions, using the transfer matrix method. Experimental impedance tube analyses are being carried out for varying geometries, along with a fabrication method for prototyping.
在一个绝大多数人都在建筑物或车辆中度过的社会中,过滤空气的需求对于确保一定程度的舒适度是必不可少的。在这些封闭空间中集成空气交换系统会产生噪音污染,从而恶化空气质量。因此,控制这些系统产生的噪音成为建筑行业面临的主要挑战。最近的传统解决方案,如声学声波晶体只允许高频噪声控制。一种解决方案是结合内部结构声学材料来控制低频传输。本文提出了一种声波晶体与结构声学材料耦合的方法来控制低频和高频的声音传输。为此,利用传递矩阵法,在COMSOL软件下建立了各种超材料模型的声学特性研究和模拟,并建立了一个选择解决方案的系统。实验阻抗管分析正在进行不同的几何形状,以及制造方法的原型。
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引用次数: 0
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Noise & Health
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