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Journal of Low Frequency Noise Vibration and Active Control最新文献

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Vibration analysis of the plate with the regular and irregular domain by using the Barycentric Lagrange interpolation 用重心拉格朗日插值法分析了规则域和不规则域板的振动
IF 2.3 4区 工程技术 Q1 Earth and Planetary Sciences Pub Date : 2018-12-28 DOI: 10.1177/1461348418819405
Yen Liang Yeh
This paper uses the Barycentric Lagrange interpolation method to explore the free vibration of a plate with the regular and irregular domain using the Chebyshev function, allowing us to consider multiple dimensions. From our results, it can be shown that the Barycentric Lagrange interpolation method can solve three-dimensional problems. In the analysis, we can see that the Barycentric Lagrange interpolation method can solve the dynamic motion of the plate with regular domain, and the error of the simulation can be reduced to 0.15%. The effect of the geometric node number on the simulated error of the natural frequency of the plate is very profound. The Barycentric Lagrange interpolation method and the extrapolation difference method can solve the natural frequency of the plate with irregular domain. The error of the simulation on the natural frequency can be reduced to 1.084%. This allows us to understand the vibration of the plate with the regular and irregular domain under various boundary conditions quickly.
本文采用重心拉格朗日插值方法,利用切比雪夫函数探讨具有规则域和不规则域的板的自由振动,允许我们考虑多个维度。结果表明,重心拉格朗日插值方法可以求解三维问题。在分析中可以看出,质心拉格朗日插值方法可以求解具有规则域的板的动态运动,仿真误差可以降低到0.15%。几何节点数对板固有频率模拟误差的影响是非常深远的。重心拉格朗日插值法和外推差分法可以求解不规则域板的固有频率。对固有频率的仿真误差可减小到1.084%。这使我们能够快速地了解具有规则域和不规则域的板在各种边界条件下的振动。
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引用次数: 2
Random vibrations in unmanned aerial vehicles, mathematical analysis and control methodology based on expectation and probability 无人机随机振动,基于期望和概率的数学分析和控制方法
IF 2.3 4区 工程技术 Q1 Earth and Planetary Sciences Pub Date : 2018-12-03 DOI: 10.1177/1461348418813031
Mohammad Abdulrahman Al-Mashhadani
The analysis of the random vibrations that occur during the flight of the unmanned aerial vehicles is important, as these random vibrations have random characteristic properties and have the ability to decrease the endurance of such systems. The accuracy of data collected from sensors in the unmanned aerial vehicle system is important for the flight control system. The transferring of these data among different sensors such as inertial measurement unit, axis accelerometers, GPS or cameras is usually affected by many factors. One of the important factors is the random vibration, which is usually caused by aerodynamic excitation or air turbulence. The problem of random vibrations has been studied for a long time and explained in many text books. In this study, the author introduces a mathematical analysis for random vibrations that are independent of their sources by considering these vibrations as a random and non-stationary process and designs a control methodology based on expectations and probability theory to reduce the effect of these vibrations. The analysis used in this research is based on the assumptions of practical approximation techniques.
无人机在飞行过程中发生的随机振动分析是非常重要的,因为这些随机振动具有随机特性,并且有可能降低系统的续航能力。无人机系统中传感器采集数据的准确性对飞行控制系统至关重要。这些数据在不同传感器(如惯性测量单元、轴加速度计、GPS或相机)之间的传输通常受到许多因素的影响。其中一个重要因素是随机振动,这通常是由气动激励或空气湍流引起的。随机振动问题已经研究了很长时间,并在许多教科书中进行了解释。在这项研究中,作者通过将这些振动视为随机和非平稳过程,引入了独立于其来源的随机振动的数学分析,并设计了基于期望和概率论的控制方法来减少这些振动的影响。本研究中使用的分析是基于实用近似技术的假设。
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引用次数: 1
Low Frequency Noise and Phantom Sounds 低频噪音和幻音
IF 2.3 4区 工程技术 Q1 Earth and Planetary Sciences Pub Date : 2009-06-01 DOI: 10.1260/0263-0923.28.2.105
Frits van den Berg
Suffering from more or less continuous and more or less steady low pitched sounds at home can be a serious threat to well-being. Often the sound source is not obvious or cannot be found. In many cases there is no clear evidence from the analysis of the ambient sound what the disturbing sound could be. Thus Low Frequency Noise (LFN) has become an ominous concept, a confrontation between sufferers asking for understanding and a solution and experts who are frequently helpless. From reported measurements one must conclude that at least in some cases it is improbable or even impossible that LFN is actually present at a relevant level. Although, even then, sufferers often are convinced there has to be a real, external source. A much simpler explanation may be there is not, but the sound originates within the person. When brought in a very quiet environment, normally hearing people often hear low pitched and other sounds not physically present: phantom sounds. A hypothesis is that, when the presence of a physical sound cannot be confirmed, LFN sufferers hear low pitched phantom sounds as other people would in a dead quiet place, but do not recognize it than such. It may help sufferers to know this is a neurological phenomenon, not a psychological one. More knowledge of the sufferer about such sounds combined with the presence of more real sound at home could help to relieve the complaints.
在家里遭受或多或少连续或多或少稳定的低音可能是对健康的严重威胁。通常声源不明显或找不到。在许多情况下,对环境声音的分析没有明确的证据表明干扰声音可能是什么。因此,低频噪声(LFN)已经成为一个不祥的概念,是要求理解和解决方案的患者与经常束手无策的专家之间的对抗。根据所报告的测量结果,人们必须得出结论,至少在某些情况下,LFN实际上不可能或甚至不可能达到相关水平。尽管如此,患者仍然坚信一定有真实的外部来源。一个更简单的解释可能是没有,但声音来自人的内心。当被带到一个非常安静的环境中时,正常听力的人经常会听到低音调和其他不存在的声音:幻音。有一种假设是,当无法确认物理声音的存在时,LFN患者会像其他人在一个非常安静的地方一样听到低沉的幽灵声,但却无法识别它。这可能有助于患者了解这是一种神经现象,而不是心理现象。更多地了解患者对这种声音的了解,再加上家里有更多真实的声音,可能有助于减轻他们的抱怨。
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引用次数: 5
Combined Exposures of Noise and Whole-Body Vibration and the effects on Psychological Responses, a Review 噪声与全身振动联合暴露及其对心理反应的影响
IF 2.3 4区 工程技术 Q1 Earth and Planetary Sciences Pub Date : 2008-12-01 DOI: 10.1260/026309208786926787
J. Ljungberg
The aim of this review is to shed light on a research area that concerns the studies of psychological responses to combined exposures of noise and whole-body vibration (WBV). Vehicle drivers are a group of workers that are often exposed to multiple stressors like noise, WBV and mental loads. Degraded performance because of environmental stressors may lead to injury or accidents. Standards that govern health risk assessment do not take into consideration the complexities of these multiple exposure environments (ISO 1997a, ISO 1999). Some studies have shown that the effect of one factor may be different than the effect of two factors presented together. For example, negative combined effects have been found in tracking tasks (Sommer and Harris, 1973), in arithmetic tasks (Harris and Schoenberger, 1980), as well as in subjective ratings (Ljungberg, Neely, Lundstrom, 2004), although in many of the studies the noise and WBV stimuli have been very unlike those that can be found in real workmg environments. Applying methods from the “irrelevant sound” paradigm (e.g. Jones, 1990) by using short-term memory tasks with a serial component as well as focus on frequencies rather than level has been revealed to tap the resources both objectively and subjectively more in both noise and WBV studies (e.g. Banbury et al. 2001; Kjellberg, 1990) Still, most experiments that have been conducted have focused on rather short exposure times in controlled laboratory settings. Using longer exposure times might also reveal other results since longer exposure times may be negatively related to sensitivity to noise and WBV (Abbate et al. 2004; Neely, Lundstrom, and Bjorkvist, 2002, Weinstein, 1978)
这篇综述的目的是为噪声和全身振动(WBV)联合暴露的心理反应研究提供一个新的研究领域。汽车司机是一群经常暴露于多种压力源的工人,如噪音、WBV和精神负荷。由于环境压力导致的性能下降可能导致伤害或事故。管理健康风险评估的标准没有考虑到这些多重接触环境的复杂性(ISO 1997a, ISO 1999)。一些研究表明,一个因素的影响可能不同于两个因素共同作用的影响。例如,在跟踪任务(Sommer and Harris, 1973)、算术任务(Harris and Schoenberger, 1980)以及主观评分(Ljungberg, Neely, Lundstrom, 2004)中发现了负面的综合效应,尽管在许多研究中,噪音和WBV刺激与在真实工作环境中发现的刺激非常不同。应用“无关声音”范式的方法(例如Jones, 1990),通过使用具有串行分量的短期记忆任务以及关注频率而不是水平,在噪声和WBV研究中都揭示了更多地利用客观上和主观上的资源(例如Banbury等人,2001;Kjellberg, 1990)尽管如此,大多数已经进行的实验都集中在受控的实验室环境中相当短的暴露时间。使用较长的曝光时间也可能揭示其他结果,因为较长的曝光时间可能与对噪声和WBV的敏感性负相关(Abbate等人,2004;Neely, Lundstrom, and Bjorkvist, 2002; Weinstein, 1978)
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引用次数: 7
Comments to: Infrasounds in Residential Area – Case Study1 评论:住宅区内的次声-个案研究1
IF 2.3 4区 工程技术 Q1 Earth and Planetary Sciences Pub Date : 1995-06-01 DOI: 10.1177/026309239501400205
Henrik MØller
The article, published in the most recent issue of the Journal, presents measurements of low and infrasonic noise emitted from an industrial zone and transmitted into a residential area. The measurements seem to have been carried out with relevant equipment and care, and the results are very much in line with, what I believe can be found in many residential areas lying close to industrial zones. However, the authors have used G-weighted levels for evaluation of noise with significant energy in the range about 20 Hz, despite the fact that the Gcurve has a low frequency cut-off at 20 Hz. This misunderstanding leads to peculiar conclusions, and it calls for comments. The article may leave the reader with the impression that infrasound having G-weighted levels as low as 62-70 dB can be perceived by humans and give rise to complaints. This indication is far from the presently accepted threshold of perception of 90-100 dB(G), and it certainly cannot be concluded on basis of the observations reported. The authors also use unweighted levels, but filtered with a low pass filter at 20 Hz, and obviously this does not change the problem. The introduction of the article reports on "reasons for complaints ... of acoustical origin", and on problems relating to infrasound as being "of increasing importance". Measurements within the residential area show Gweighted levels of 62-70 dB, and levels of 57-66 dB, when measured linearly up to 20 Hz (lower limit not reported). The authors do not mention audibility explicitly, but state that these levels are "harmless to the human hearing organs". Taken the introduction into account, the reader may understand that the measured levels can be perceived by humans, but they do not damage the ear. The authors continue by claiming that the "... possibility of non-auditory effects of infrasound on the housing estate inhabitants cannot be definitely precluded ...". Well it cannot be precluded, but on the other hand, nothing in the study has suggested that infrasound should be the cause of the effects, and the statement would have been equally true, had the G-weighted levels been even lower. No effort was done to report more precisely on the non-auditory effects and to discuss their existence, nature and origin. Nevertheless, the connection to infrasound is suggested to the reader without the slightest foundation in the study. The authors seem unnecessarily concentrated on the infrasonic region. Their
这篇文章发表在最新一期的《华尔街日报》上,介绍了从工业区发出并传播到居民区的低声和次声噪音的测量结果。这些测量似乎是在相关设备和谨慎的情况下进行的,我认为,其结果与许多靠近工业区的居民区的情况非常吻合。然而,作者使用g加权水平来评估20 Hz范围内具有显著能量的噪声,尽管g曲线在20 Hz处具有低频截止。这种误解导致了奇怪的结论,需要加以评论。这篇文章可能会给读者留下这样的印象:g级低至62-70分贝的次声可以被人类感知,并引起投诉。这一指标与目前公认的90-100 dB(G)的感知阈值相去甚远,当然也不能根据所报道的观察结果得出结论。作者还使用了未加权的电平,但使用了20 Hz的低通滤波器进行滤波,显然这并不能改变问题。文章的引言报告了“投诉的原因……”“声学起源”,以及与次声有关的问题“日益重要”。在住宅区内的测量显示,当线性测量到20 Hz时,g加权水平为62-70 dB,水平为57-66 dB(下限未报告)。作者没有明确提到可听性,但声明这些水平“对人类听觉器官无害”。考虑到引言,读者可能会理解,测量的水平可以被人类感知,但它们不会损害耳朵。作者继续声称“……不能绝对排除次声对住宅区居民产生非听觉影响的可能性……”这是不能排除的,但另一方面,研究中没有任何证据表明次声是造成这种影响的原因,如果g加权水平更低,这个结论也是同样正确的。对于非听觉效应,没有更精确的报道,也没有讨论它们的存在、性质和起源。然而,在没有丝毫研究基础的情况下,向读者提出了与次声的联系。作者似乎不必要地集中在次声波区域。他们的
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引用次数: 4
Interferometric Low-Frequency Calibration of Translation and Rotation Quantity Transducers 平移和旋转量传感器的干涉低频定标
IF 2.3 4区 工程技术 Q1 Earth and Planetary Sciences Pub Date : 1994-06-01 DOI: 10.1177/026309239401300203
Hans-Juergen von Martens, A. Taubner
INTRODUCTION In the past ten years. novel air-borne vibration exciters and interferometric measuring facilities have been developed allowing the accurate dynamic calibration of accelerometers. velocimeters and displacement transducers to be performedl-l. Since 1990, standard methods for the excitation and measurement of angular accelerations, angular velocities and rotational angles with specific time dependences have been developed at the Physikalisch-Technische Bundesanstalt (PTB). The facilities available in the PTB's "Acceleration" laboratory in Berlin for the calibration of translational and rotational quantity transducers are based on a universal concept for both the generation and measurement of the motion quantities. This concept and its application, especially for the low-frequency calibration of transducers. are presented in this paper.
在过去的十年里。新型的机载激振器和干涉测量设备已经开发出来,可以对加速度计进行精确的动态校准。速度计和位移传感器要执行- 1。自1990年以来,德国物理技术研究中心(PTB)开发了具有特定时间依赖性的角加速度、角速度和转角的激发和测量标准方法。PTB在柏林的“加速”实验室可用于校准平移和旋转量传感器的设施是基于运动量的产生和测量的通用概念。这一概念及其应用,尤其适用于换能器的低频校准。都是本文的主要内容。
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引用次数: 2
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Journal of Low Frequency Noise Vibration and Active Control
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