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Design of Corrugated Plates for Optimal Fundamental Frequency 优化基频的波纹板设计
Q2 Physics and Astronomy Pub Date : 2016-07-18 DOI: 10.1155/2016/4290247
Nabeel Alshabatat
This paper investigates shifting the fundamental frequency of plate structures by corrugation. Creating corrugations significantly improves the flexural rigidities of plate and hence increases its natural frequencies. Two types of corrugations are investigated: sinusoidal and trapezoidal corrugations. The finite element method (FEM) is used to model the corrugated plates and extract the natural frequencies and mode shapes. The effects of corrugation geometrical parameters on simply supported plate fundamental frequency are studied. To reduce the computation time, the corrugated plates are modeled as orthotropic flat plates with equivalent rigidities. To demonstrate the validity of modeling the corrugated plates as orthotropic flat plates in studying the free vibration characteristics, a comparison between the results of finite element model and equivalent orthotropic models is made. A correspondence between the results of orthotropic models and the FE models is observed. The optimal designs of sinusoidal and trapezoidal corrugated plates are obtained based on a genetic algorithm. The optimization results show that plate corrugations can efficiently maximize plate fundamental frequency. It is found that the trapezoidal corrugation can more efficiently enhance the fundamental frequency of simply supported plate than the sinusoidal corrugation.
本文研究了波纹法对板结构基频位移的影响。波纹的产生显著提高了板的弯曲刚度,从而提高了板的固有频率。研究了两种类型的波纹:正弦波纹和梯形波纹。采用有限元法对波纹板进行建模,提取波纹板的固有频率和振型。研究了波纹几何参数对简支板基频的影响。为了减少计算时间,将波纹板建模为具有等效刚度的正交各向异性平板。为了验证将波纹板建模为正交各向异性平板在研究其自由振动特性时的有效性,将有限元模型的结果与等效正交各向异性模型的结果进行了比较。观察到正交各向异性模型的结果与有限元模型的结果是一致的。采用遗传算法对正弦和梯形波纹板进行了优化设计。优化结果表明,波纹板可以有效地最大化板基频。发现梯形波纹比正弦波纹能更有效地提高简支板的基频。
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引用次数: 10
Acoustical Measurement and Biot Model for Coral Reef Detection and Quantification 珊瑚礁探测与量化的声学测量与生物模型
Q2 Physics and Astronomy Pub Date : 2016-04-06 DOI: 10.1155/2016/2350615
H. Manik
Coral reefs are coastal resources and very useful for marine ecosystems. Nowadays, the existence of coral reefs is seriously threatened due to the activities of blast fishing, coral mining, marine sedimentation, pollution, and global climate change. To determine the existence of coral reefs, it is necessary to study them comprehensively. One method to study a coral reef by using a propagation of sound waves is proposed. In this research, the measurement of reflection coefficient, transmission coefficient, acoustic backscattering, hardness, and roughness of coral reefs has been conducted using acoustic instruments and numerical modeling using Biot theory. The results showed that the quantification of the acoustic backscatter can classify the type of coral reef.
珊瑚礁是海岸资源,对海洋生态系统非常有用。如今,由于爆破捕鱼、珊瑚开采、海洋沉积、污染和全球气候变化等活动,珊瑚礁的生存受到严重威胁。为了确定珊瑚礁的存在,有必要对它们进行全面的研究。提出了一种利用声波传播来研究珊瑚礁的方法。本研究利用声学仪器和Biot理论的数值模拟对珊瑚礁的反射系数、透射系数、声后向散射、硬度和粗糙度进行了测量。结果表明,声波后向散射的量化可以对珊瑚礁类型进行分类。
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引用次数: 6
Vibrational Comfort on Board the Vehicle: Influence of Speed Bumps and Comparison between Different Categories of Vehicle 车辆振动舒适性:减速带的影响及不同类别车辆的比较
Q2 Physics and Astronomy Pub Date : 2016-01-01 DOI: 10.1155/2016/2676021
V. Barone, D. W. Mongelli, Antonio Tassitani
This paper shows the results of a study conducted on five different categories of vehicles in a specific test site. The aim was to investigate how the effect of the test site discontinuity determines variations of comfort related to the increase in speed and to the five selected road vehicles of different classes. Measurements were obtained by combining data relating to vibrations in the three reference axes, detected through a vibration dosimeter (VIB-008), and geolocation data (latitude, longitude, and speed) identified by the GPS inside a smartphone. This procedure, through the synchronization between dosimeter and GPS location, has been helpful in postprocessing to eliminate any measurement anomalies generated by the operator. After the survey campaign it was determined that a formulation allows defining a Comfort Index (CI) depending on velocity and five vehicles of different classes. This study showed that the presence of speed bumps, in the test site investigated, appears to be uncomfortable even at speeds well below those required by the Highway Code.
本文展示了在特定试验场对五种不同类别车辆进行研究的结果。目的是调查测试场地不连续性的影响如何决定与速度增加和五种不同类别的选定道路车辆相关的舒适性变化。测量结果是通过振动剂量计(VIB-008)检测到的三个参考轴的振动数据,以及智能手机内GPS识别的地理位置数据(纬度、经度和速度)结合起来获得的。该程序通过剂量计和GPS位置之间的同步,有助于在后处理中消除操作员产生的任何测量异常。在调查活动之后,确定了一个公式,可以根据速度和五种不同级别的车辆来定义舒适度指数(CI)。这项研究表明,在被调查的测试地点,即使在远低于公路法规要求的速度下,减速带的存在似乎也会让人不舒服。
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引用次数: 14
CAA of an Air-Cooling System for Electronic Devices 电子设备风冷系统的CAA
Q2 Physics and Astronomy Pub Date : 2016-01-01 DOI: 10.1155/2016/4785389
Sven Münsterjohann, J. Grabinger, S. Becker, M. Kaltenbacher
This paper presents the workflow and the results of fluid dynamics and aeroacoustic simulations for an air-cooling system as used in electronic devices. The setup represents a generic electronic device with several electronic assemblies with forced convection cooling by two axial fans. The aeroacoustic performance is computed using a hybrid method. In a first step, two unsteady CFD simulations using the Unsteady Reynolds-Averaged Navier-Stokes simulation with Shear Stress Transport (URANS-SST) turbulence model and the Scale Adaptive Simulation with Shear Stress Transport (SAS-SST) models were performed. Based on the unsteady flow results, the acoustic source terms were calculated using Lighthill’s acoustic analogy. Propagation of the flow-induced sound was computed using the Finite Element Method. Finally, the results of the acoustic simulation are compared with measurements and show good agreement.
本文介绍了用于电子设备的空气冷却系统的流体力学和气动声学模拟的工作流程和结果。该装置代表了一个通用的电子设备,具有几个电子组件,通过两个轴流风扇强制对流冷却。采用混合方法计算气动声学性能。首先,采用非定常剪切应力输运模型(URANS-SST)和剪切应力输运模型(SAS-SST)进行了两种非定常CFD模拟。基于非定常流动结果,采用Lighthill声学类比法计算了声源项。用有限元法计算了流致声的传播。最后,将声学模拟结果与实测结果进行了比较,结果吻合较好。
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引用次数: 1
Simulating the Effects of Surface Roughness on Reinforced Concrete T Beam Bridge under Single and Multiple Vehicles 单车和多车作用下钢筋混凝土T梁桥表面粗糙度影响的模拟
Q2 Physics and Astronomy Pub Date : 2016-01-01 DOI: 10.1155/2016/3594148
R. Kalyankar, N. Uddin
This research focuses on the application of the spatial system of finite element modeling for the vehicle-bridge interaction on reinforced concrete US Girder Bridge in order to obtain the effect of surface roughness. Single vehicle and multiple vehicles on reinforced concrete T beam bridge were studied with variable surface roughness profiles. The effects of six different surface roughness profiles (very good, good, measured, average, poor, and very poor) were investigated for vehicle-bridge interaction. The values of the Dynamic Amplification Factor (DAF) were obtained for single and multiple vehicles on T Beam Bridge for different surface roughness profiles, along with the distances between the axles of heavy vehicle. It was observed that when the bridge has very good, good, measured, and average surface roughness, the DAF values for the single vehicle over the bridge were observed to be within acceptable limits specified by AASHTO. However, for the bridge with multiple vehicles only very good and measured surface roughness profiles showed a DAF and vehicle axle distances within the acceptable limits. From the current studies, it was observed that the spatial system showed reliable responses for predicting the behavior of the bridge under variable road surface roughness conditions and was reliable in vehicle axle detection, and therefore, it has a potential to be use for realistic simulations.
本研究将车桥相互作用有限元建模空间系统应用于钢筋混凝土美国梁桥,以获得表面粗糙度的影响。以不同表面粗糙度的钢筋混凝土T梁桥为研究对象,研究了单车和多车在不同表面粗糙度条件下的作用。研究了六种不同表面粗糙度剖面(非常好、良好、可测量、平均、差和非常差)对车辆-桥梁相互作用的影响。得到了T梁桥单车和多车在不同表面粗糙度下的动态放大系数(DAF)值,以及重型车辆轴距的变化。观察到,当桥梁具有非常好、良好、测量和平均表面粗糙度时,观察到桥梁上的单个车辆的DAF值在AASHTO规定的可接受范围内。然而,对于有多个车辆的桥梁,只有非常好的表面粗糙度剖面显示DAF和车辆轴距在可接受的范围内。从目前的研究中可以看出,该空间系统在预测不同路面粗糙度条件下桥梁的行为方面表现出可靠的响应,并且在车辆轴检测方面也很可靠,因此,它有可能用于现实模拟。
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引用次数: 5
Electricity Generation Characteristics of Energy-Harvesting System with Piezoelectric Element Using Mechanical-Acoustic Coupling 基于机声耦合的压电集能系统发电特性研究
Q2 Physics and Astronomy Pub Date : 2016-01-01 DOI: 10.1155/2016/4217517
Hirotarou Tsuchiya, H. Moriyama, S. Iwamori
This paper describes the electricity generation characteristics of a new energy-harvesting system with piezoelectric elements. The proposed system is composed of a rigid cylinder and thin plates at both ends. The piezoelectric elements are installed at the centers of both plates, and one side of each plate is subjected to a harmonic point force. In this system, vibration energy is converted into electrical energy via electromechanical coupling between the plate vibration and piezoelectric effect. In addition, the plate vibration excited by the point force induces a self-sustained vibration at the other plate via mechanical-acoustic coupling between the plate vibrations and an internal sound field into the cylindrical enclosure. Therefore, the electricity generation characteristics should be considered as an electromechanical-acoustic coupling problem. The characteristics are estimated theoretically and experimentally from the electric power in the electricity generation, the mechanical power supplied to the plate, and the electricity generation efficiency that is derived from the ratio of both power. In particular, the electricity generation efficiency is one of the most appropriate factors to evaluate a performance of electricity generation systems. Thus, the effect of mechanical-acoustic coupling is principally evaluated by examining the electricity generation efficiency.
本文介绍了一种新型压电能量收集系统的发电特性。该系统由刚性圆柱体和两端的薄板组成。压电元件安装在两个板的中心,每个板的一侧受到谐波点力。在该系统中,振动能量通过板振动与压电效应的机电耦合转化为电能。此外,由点力激发的板振动通过板振动与进入圆柱外壳的内部声场之间的机械声耦合在另一个板上引起自持续振动。因此,发电特性应视为一个机电声耦合问题。从发电中的电功率,提供给板的机械功率,以及由两者功率之比推导出的发电效率,从理论上和实验上估计了该特性。特别是发电效率是评价发电系统性能的最合适的因素之一。因此,机械声耦合的影响主要是通过检查发电效率来评估的。
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引用次数: 1
Sound Transmission in a Duct with Sudden Area Expansion, Extended Inlet, and Lined Walls in Overlapping Region 具有突然面积膨胀、扩展进气道和重叠区域内衬壁的管道中的声传输
Q2 Physics and Astronomy Pub Date : 2016-01-01 DOI: 10.1155/2016/9485163
A. Demir
The transmission of sound in a duct with sudden area expansion and extended inlet is investigated in the case where the walls of the duct lie in the finite overlapping region lined with acoustically absorbent materials. By using the series expansion in the overlap region and using the Fourier transform technique elsewhere we obtain a Wiener-Hopf equation whose solution involves a set of infinitely many unknown expansion coefficients satisfying a system of linear algebraic equations. Numerical solution of this system is obtained for various values of the problem parameters, whereby the effects of these parameters on the sound transmission are studied.
本文研究了在吸声材料衬砌的有限重叠区域内,具有突然面积膨胀和进口延长的风管中的声传播。通过在重叠区域使用级数展开,在其他地方使用傅里叶变换技术,我们得到了一个Wiener-Hopf方程,其解涉及一组满足线性代数方程组的无限多个未知展开系数。得到了问题参数不同取值时系统的数值解,从而研究了这些参数对声传输的影响。
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引用次数: 3
On Peculiarities of Propagation of a Plane Elastic Wave through a Gradient Anisotropic Layer 平面弹性波在梯度各向异性层中的传播特性
Q2 Physics and Astronomy Pub Date : 2015-12-28 DOI: 10.1155/2015/515263
A. Anufrieva, D. Chickrin, D. Tumakov
The problem of diffraction of a plane elastic wave by an anisotropic layer is studied. The diffraction problem is reduced to a boundary value problem for the layer. The grid method is used for solving the resulting boundary value problem. The diffraction of a plane longitudinal wave by the layer is considered. Some peculiarities of the gain-frequency and the gain-angle characteristics of a normal component of an energy flow of a passed longitudinal wave are numerically studied.
研究了平面弹性波在各向异性层中的衍射问题。衍射问题被简化为层的边值问题。采用网格法求解得到的边值问题。考虑了平面纵波经该层的衍射。本文对纵波能量流法向分量的增益频率和增益角特性进行了数值研究。
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引用次数: 6
Modeling of Laterally Sliding Motion of a Magnetic Clamp 磁夹横向滑动运动的建模
Q2 Physics and Astronomy Pub Date : 2015-12-15 DOI: 10.1155/2015/707043
A. Mahmud, J. Mayer, L. Baron
A sliding magnetic clamp is used to hold a thin aluminum panel during a milling operation. The design includes a permanent magnet group follower (slave module) which slides laterally over the panel attracted by another permanent magnet group (master module) attached to the industrial robot end effector from the machined side of the panel. The lateral sliding motion of the slave module in response to the master module motion is studied using a transfer function based motion model established considering the lateral magnetic stiffness. The model is validated experimentally.
在铣削过程中,使用滑动磁夹来固定薄铝板。该设计包括一个永磁组从动件(从模块),该从动件被另一个永磁组(主模块)从面板的加工侧附着到工业机器人末端执行器上,并在面板上横向滑动。利用考虑横向磁刚度的基于传递函数的运动模型,研究了从模块响应主模块运动的横向滑动运动。实验验证了模型的正确性。
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引用次数: 0
Eigennoise Speech Recovery in Adverse Environments with Joint Compensation of Additive and Convolutive Noise 不利环境下加性和卷积噪声联合补偿的特征噪声语音恢复
Q2 Physics and Astronomy Pub Date : 2015-11-03 DOI: 10.1155/2015/170183
Trung-Nghia Phung, Huy-Khoi Do, Van-Tao Nguyen, Quang Thai
The learning-based speech recovery approach using statistical spectral conversion has been used for some kind of distorted speech as alaryngeal speech and body-conducted speech (or bone-conducted speech). This approach attempts to recover clean speech (undistorted speech) from noisy speech (distorted speech) by converting the statistical models of noisy speech into that of clean speech without the prior knowledge on characteristics and distributions of noise source. Presently, this approach has still not attracted many researchers to apply in general noisy speech enhancement because of some major problems: those are the difficulties of noise adaptation and the lack of noise robust synthesizable features in different noisy environments. In this paper, we adopted the methods of state-of-the-art voice conversions and speaker adaptation in speech recognition to the proposed speech recovery approach applied in different kinds of noisy environment, especially in adverse environments with joint compensation of additive and convolutive noises. We proposed to use the decorrelated wavelet packet coefficients as a low-dimensional robust synthesizable feature under noisy environments. We also proposed a noise adaptation for speech recovery with the eigennoise similar to the eigenvoice in voice conversion. The experimental results showed that the proposed approach highly outperformed traditional nonlearning-based approaches.
基于学习的基于统计谱转换的语音恢复方法已被用于某些畸变语音,如咽音语音和体传语音(或骨传语音)。该方法试图在不了解噪声源特征和分布的前提下,通过将噪声语音的统计模型转换为干净语音的统计模型,从噪声语音(失真语音)中恢复干净语音(未失真语音)。目前,由于存在噪声自适应困难和缺乏不同噪声环境下的噪声鲁棒性合成特征等问题,该方法尚未被广泛应用于一般的噪声语音增强中。本文采用语音识别中最先进的语音转换和说话人自适应方法,提出了一种适用于不同噪声环境的语音恢复方法,特别是在加性噪声和卷积噪声联合补偿的不利环境下。我们提出在噪声环境下使用去相关小波包系数作为低维鲁棒可合成特征。我们还提出了一种用于语音恢复的噪声自适应方法,其特征噪声与语音转换中的特征语音相似。实验结果表明,该方法明显优于传统的非基于学习的方法。
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引用次数: 0
期刊
Advances in Acoustics and Vibration
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