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Vibration Control of Vertical Turbine Pump by Optimization of Vane Pitch Tolerances of an Impeller Using Statistical Techniques 基于统计技术优化叶轮桨距公差的立式涡轮泵振动控制
IF 0.6 Q4 ACOUSTICS Pub Date : 2021-01-01 DOI: 10.32604/sv.2021.017000
Ravindra S. Birajdar, A. Keste, S. Gawande
The objective of the study is to find the tolerance on vane pitch dimensions of a Vertical Turbine (VT) pump impeller. For this purpose, the study is divided into two parts viz. to find the critical hydraulic eccentricity of a VT pump impeller by way of numerical simulations and design of experiments to find the vane pitch tolerance using critical hydraulic eccentricity. The effect of impeller vane pitch deviations on hydraulic unbalance is examined for a vertical turbine pump using Design of Experiments (DOE). A suitable orthogonal matrix has been selected with vane pitch at different axial locations of an impeller as the control factors. Hydraulic eccentricity, which is the output of the DOE experiments is analyzed using S/N ratio, ANOM and regression analysis to find the significant control factor effecting the hydraulic unbalance and hence vibrations. The vane pitch deviation at outlet and inlet of impeller shroud geometry are found to be the most critical factor affecting the pump vibrations.
研究的目的是找出垂直涡轮(VT)泵叶轮叶片节距尺寸的公差。为此,本研究分为两部分,分别是通过数值模拟的方法求出VT泵叶轮的临界水力偏心率,以及通过实验设计利用临界水力偏心率求出叶片节距公差。采用实验设计方法研究了立式涡轮泵叶轮叶片节距偏差对水力不平衡的影响。以叶轮不同轴向位置的叶片节距为控制因素,选择了合适的正交矩阵。利用信噪比、方差分析和回归分析等方法对DOE实验输出的液压偏心进行分析,找出影响液压不平衡进而影响振动的显著控制因素。研究发现,叶轮叶冠几何形状在出口和进口处的桨距偏差是影响泵振动的最关键因素。
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引用次数: 0
Dynamic Modeling of the Feed Drive System of a CNC Metal Cutting Machine 数控金属切割机进给驱动系统的动力学建模
IF 0.6 Q4 ACOUSTICS Pub Date : 2021-01-01 DOI: 10.32604/SV.2021.04410
H. Heydarnia, I. Kiselev, M. M. Ermolaev, S. Nikolaev
Studying the vibrational behavior of feed drive systems is important for enhancing the structural performance of computer numerical control (CNC) machines. The preload on the screw and nut position have a great influence on the vibration characteristics of the feed drive as two very important operational conditions. Rotational acceleration of the screw also affects the performance of the CNC feed drive when machining small parts. This paper investigates the influence of preload and nut position on the vibration characteristics of the feed drive system of a CNC metal cutting machine in order to be able to eliminate an observed resonance occurred at high rotational speeds of the screw, corresponding to high feed rates. Additionally, rational structural parameters of the feed drive system are selected in order to increase the rotational acceleration for improving the performance of the CNC machine. Experiments and analyses showed that by selecting specific parameters of feed drive system and simultaneously applying a certain value of preload, a 97% increase in rotational acceleration and 30% time reduction considering the vibration resistance at high rotational speeds can be achieved.
研究进给传动系统的振动特性对提高数控机床的结构性能具有重要意义。作为进给传动的两个重要工况,螺杆和螺母位置上的预紧力对进给传动的振动特性影响很大。在加工小零件时,螺杆的旋转加速度也会影响数控进给传动的性能。本文研究了预紧力和螺母位置对数控金属切割机进给驱动系统振动特性的影响,以便能够消除观察到的在高转速下发生的共振,对应于高进给速率。此外,选择合理的进给驱动系统结构参数,以增加旋转加速度,从而提高数控机床的性能。实验和分析表明,通过选择特定的进给驱动系统参数,同时施加一定的预紧力,可以实现高转速下旋转加速度提高97%,考虑抗振时间减少30%的目标。
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引用次数: 0
Static and Dynamic Analyses of Spliced Column 拼接柱的静力与动力分析
IF 0.6 Q4 ACOUSTICS Pub Date : 2021-01-01 DOI: 10.32604/sv.2021.011627
Deepak Kumar Singh
The analysis of spliced column has been carried out to detect optimum location of providing splices in the column. In the present work, static and dynamic (free vibration) analyses of spliced column have been done by randomising the location of splicing. A symmetrical four storey steel framed building has been modelled, analysed and designed for loads (dead, live and earthquake loads) recommended by Indian Codal provisions using Staad.Pro. The critical column at each floor level is identified based on axial force (AF), bending moment (BM) and shear force (SF). The total 16 models of spliced columns have been designed and then modelled in a 3D CAD Design tool (SOLIDWORKS) and then imported in the finite element tool (ANSYSWorkbench 14.0) for detailed analysis. The variation of stress, strain and deflection of the spliced column are shown in the form of contour. Further, the modal analysis is performed to determine the natural frequencies. The results of static and dynamic analyses are compared for each modelled spliced column to obtain the optimum location for providing splices in the column. The dynamic analysis of spliced column is of utmost importance in the region where dynamic loadings like earthquake, cyclones etc. are more frequent, and mere static analysis does not account for the safety of the structure. This study will help the engineers to select directly the optimum size and location of the splices in the column of a steel framed building.
对拼接柱进行了分析,以确定在柱内提供拼接的最佳位置。在本工作中,通过随机拼接位置对拼接柱进行了静力和动力(自由振动)分析。一个对称的四层钢框架建筑已经建模,分析和设计荷载(死荷载,活荷载和地震荷载)由印度Codal规定使用Staad.Pro推荐。根据轴力(AF)、弯矩(BM)和剪力(SF)确定各层的临界柱。对拼接柱共16个模型进行了设计,然后在三维CAD设计工具(SOLIDWORKS)中进行建模,然后导入有限元工具(ANSYSWorkbench 14.0)进行详细分析。剪接柱的应力、应变和挠度变化以等值线图的形式表示。此外,进行模态分析以确定固有频率。通过对每个模型拼接柱的静力分析和动力分析结果进行比较,得出了在柱内提供拼接的最佳位置。在地震、旋风等动力荷载较为频繁的地区,单纯的静力分析不足以保证结构的安全性,对叠合柱进行动力分析至关重要。该研究将有助于工程师直接选择钢框架建筑柱中接头的最佳尺寸和位置。
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引用次数: 0
Modal Control of Cantilever Beam Using a Gyrostabilizer 基于陀螺稳定器的悬臂梁模态控制
IF 0.6 Q4 ACOUSTICS Pub Date : 2021-01-01 DOI: 10.32604/sv.2021.015705
O. Çuvalci, F. Ünker, Turgut Batuhan Baturalp, Utku Gülbulak, A. Ertas
In this paper, an experimental model of a horizontal cantilever beam with a rotating/oscillating attached to the shaker for harmonic excitation at the one end and a gyrostabilizer at the other end is built to verify the equations of the Lagrangian model. The primary focus of the study was to investigate the parameters of excitation amplitude, natural frequency, rotating mass (disk mass), and disk speed of gyro that would minimize the amplitude of the beam to identify these effects. Numerical and experimental results indicate that the angular momentum of the gyrostabilizer is the most effective parameter in the reduction of beam displacement.
为了验证拉格朗日模型的方程,本文建立了一端在激振器上附加旋转/振荡装置进行谐波激励,另一端附加陀螺稳定器的水平悬臂梁的实验模型。本研究的主要重点是研究陀螺仪的激励幅度、固有频率、旋转质量(磁盘质量)和磁盘速度等参数,这些参数将使光束的振幅最小化,以确定这些影响。数值和实验结果表明,陀螺稳定器的角动量是减小光束位移最有效的参数。
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引用次数: 1
Manipulating Chladni Patterns of Ferromagnetic Materials by an External Magnetic Field 利用外磁场操纵铁磁材料的克拉尼模式
IF 0.6 Q4 ACOUSTICS Pub Date : 2021-01-01 DOI: 10.32604/sv.2021.015008
Kenneth R. Podolak, Vihan A.W. Wickramasinghe, Gareth A. Mansfield, Alex M. Tuller
Ernst Chladni is called the father of acoustics for his work, which includes investigating patterns formed by vibrating plates. Understanding these patterns helps research involving standing waves and other harmonic behaviors, including studies of single electron orbits in atoms. Our experiment vibrates circular plates which result in well-known patterns. Alternatively to traditional experiments that used sand or salt, we use magnetic materials, namely iron filings and nickel powder. We then manipulate the patterns by applying a localized external magnetic field to one of the rings that moves a segment of the magnetic material in that ring to the next inner ring. The results show a significant decrease in magnetic field necessary to move the magnetic material at higher frequencies as well as a significant decrease in the magnetic field required to move the magnetic material as nickel powder is substituted for iron filings while keeping the mass constant.
Ernst Chladni被称为声学之父,因为他的工作包括研究振动板形成的模式。了解这些模式有助于研究驻波和其他谐波行为,包括原子中单电子轨道的研究。我们的实验是通过振动圆形板来产生众所周知的图案。与传统使用沙子或盐的实验不同,我们使用磁性材料,即铁屑和镍粉。然后,我们通过在其中一个环上施加一个局部的外部磁场来操纵这些图案,从而将该环中的一部分磁性物质移动到下一个内环上。结果表明,在较高频率下移动磁性材料所需的磁场显著减小,同时在保持质量不变的情况下,用镍粉代替铁屑移动磁性材料所需的磁场显著减小。
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引用次数: 0
Experimental Modal Damping Identification of a Mechanical Structure Using Video Magnification Technique 基于视频放大技术的机械结构模态阻尼试验识别
IF 0.6 Q4 ACOUSTICS Pub Date : 2021-01-01 DOI: 10.32604/sv.2021.015293
J. Hallal, M. Fakih, H. Damerji, M. Hammoud, Mehdi Chouman
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引用次数: 0
Reducing Occupational Noise Propagated from Centrifugal Fan through Dissipative Silencers: A Field Study 利用耗散消声器降低离心式通风机职业性噪声的现场研究
IF 0.6 Q4 ACOUSTICS Pub Date : 2021-01-01 DOI: 10.32604/SV.2021.08930
A. Variani, Masoumeh Ghorbanide, S. Zare, Saeid Ahmadi, Zahra Hashemi
Acoustic performance of dissipative silencer was evaluated to determine the effectiveness of perforated duct porosity and absorbent material density in reducing occupational noise exposure propagated from centrifugal fan. Design charts were applied to predict noise reduction and length of a dissipative silencer. Dissipative silencers with various punched duct porosity (14%, 30% and 40%) and sound absorbent density (80 Kg/m, 120 Kg/m, and 140 Kg/m) were designed and fabricated. According to ISO9612 and ISO11820, noise level was measured before and after installing all nine test silencers at fixed workstations around the discharge side of a centrifugal fan in a manufacturing plant. On average, the noise level at the discharge side of a fan without silencer was measured to be 93.6 dBA, whereas it was significantly mitigated by 67.4 dBA to 70.1 dBA after installing all silencers. Dynamic insertion loss for a dissipative silencer with 100 cm length was predicted to be 27.9 dB, which was in agreement with experimental ones. Although, there was no significant differences between insertion loss of silencers, the one with 30% porosity and 120 Kg/m rock wool density had the highest insertion loss of 26.2 dBA. Dissipative silencers noticeably reduced centrifugal fan noise exposures. Increasing sound absorbent density and duct porosity up to a certain limit could probably be effective in noise reduction of dissipative silencers.
通过对耗散型消声器的声学性能进行评价,以确定孔管孔隙度和吸声材料密度对降低职业性噪声暴露的影响。设计图表应用于预测降噪和长度耗散消声器。设计和制作了不同孔隙率(14%、30%和40%)和吸声密度(80 Kg/m、120 Kg/m和140 Kg/m)的消声器。根据ISO9612和ISO11820,在制造工厂的离心风机排出侧周围的固定工作站安装所有九个测试消声器之前和之后测量噪声水平。在没有消声器的情况下,风扇排气侧的平均噪音水平为93.6 dBA,而在安装了所有消声器后,风扇排气侧的噪音水平显著降低了67.4 dBA至70.1 dBA。100 cm长度的耗散消声器的动态插入损失预测值为27.9 dB,与实验值基本一致。虽然不同消声器的插入损失没有显著差异,但孔隙率为30%、岩棉密度为120 Kg/m的消声器的插入损失最高,为26.2 dBA。耗散消声器明显减少了离心风扇的噪音暴露。将吸声密度和管道孔隙度提高到一定限度可能是耗散消声器降噪的有效方法。
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引用次数: 0
Prediction and Limitations of Noise Maps Developed for Heterogeneous Urban Road Traffic Condition: A Case Study of Surat City, India 非均匀城市道路交通状况噪音地图的预测与限制:以印度苏拉特市为例
IF 0.6 Q4 ACOUSTICS Pub Date : 2021-01-01 DOI: 10.32604/SV.2021.010715
Dipeshkumar R. Sonaviya, B. Tandel
Road traffic noise pollution has been recognized as a serious issue which affects human health as well as affects urban regions. Noise maps are very beneficial to identify the impact of noise pollution. A noise mapping study performed to study the propagation of noise in tier-II city along with field measurements. The noise maps are developed using a computer simulation model (SoundPLAN essential 4.0 software). The noise prediction models like U.K’s CoRTN, Germany’s RLS-90, and their modified versions, which can be used for homogenous road traffic conditions, cannot be successfully applied in heterogeneous road traffic conditions of India. In developing country like India, road traffic noise pollution depends on the composition of heterogeneous traffic volume, variance in road geometrical, honking conditions, un-authorized parking, and varying density of the building on either side of the road. These traffic compositions contain vehicles, which have different sizes, speeds variations, a different dimension of vehicles. Because of fluctuating speeds, lack of lane disciplines, and un-authorized parking on main road lanes, honking events becomes inevitable, which changes and affects the urban soundscape of nations like India. Analysis of noise maps showed that horn honking due to un-authorized parked vehicles contributed an additional increase up to 11 dB (A) noise, which is quite significant.
道路交通噪声污染已被公认为是影响人类健康和城市地区的一个严重问题。噪音图对识别噪音污染的影响非常有用。通过现场测量,对二线城市的噪声传播进行了噪声测绘研究。使用计算机模拟模型(SoundPLAN essential 4.0软件)开发噪声图。英国的CoRTN、德国的RLS-90等噪声预测模型及其改进版本可以用于同质道路交通条件,但不能成功应用于印度的异质道路交通条件。在印度这样的发展中国家,道路交通噪声污染取决于异质性交通量的组成、道路几何形状的变化、鸣笛条件、未经授权的停车以及道路两侧建筑密度的变化。这些交通组合包含车辆,它们有不同的尺寸,速度变化,不同尺寸的车辆。由于速度波动,缺乏车道规则,以及在主要车道上未经授权的停车,鸣笛事件变得不可避免,这改变并影响了印度等国家的城市声景。对噪音地图进行分析的结果显示,未经许可停放的车辆按喇叭导致的噪音增加幅度高达11 dB (A),这是非常显著的。
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引用次数: 2
Duffing Oscillator’s Vibration Control under Resonance with a Negative Velocity Feedback Control and Time Delay 带负速度反馈和时滞的Duffing振荡器共振振动控制
IF 0.6 Q4 ACOUSTICS Pub Date : 2021-01-01 DOI: 10.32604/sv.2021.014358
Y. A. Amer, Taher A. Bahnasy
An externally excited Duffing oscillator under feedback control is discussed and analyzed under the worst resonance case. Multiple time scales method is applied for this system to find analytic solution with the existence and nonexistence of the time delay on control loop. An appropriate stability analysis is also performed and appropriate choices for the feedback gains and the time delay are found in order to reduce the amplitude peak. Different response curves are involved to show and compare controller effects. In addition, analytic solutions are compared with numerical approximation solutions using Rung-Kutta method of fourth order.
对反馈控制下的外激Duffing振荡器在最坏谐振情况下进行了讨论和分析。采用多时间尺度法对该系统求解控制环存在和不存在时滞的解析解。本文还进行了适当的稳定性分析,并对反馈增益和时间延迟进行了适当的选择,以减小振幅峰值。不同的响应曲线用于显示和比较控制器的效果。此外,利用四阶龙库塔法对解析解与数值逼近解进行了比较。
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引用次数: 0
Optimization of Transducer Location for Novel Non-Intrusive Methodologies of Diagnosis in Diesel Engines 基于新型非侵入式诊断方法的柴油机传感器位置优化
IF 0.6 Q4 ACOUSTICS Pub Date : 2021-01-01 DOI: 10.32604/sv.2021.016539
S. Narayan, M. U. Kaisan, S. Abubakar, Faisal O. Mahroogi, Vipul Gupta
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引用次数: 1
期刊
Sound and Vibration
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