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24th International Congress on sound and Vibration, ICsV 2017

作者： Liu, YuCheng Feng Chia University Bachelor's Program in Precision System Design No. 100 Wenhwa Rd. Seatwen Taichung Taiwan

The aim of this paper was to demonstrate the baffled effect of mobile phone panel at higher frequencies and presents an approach for localizing the optimal position of microphone receiving hole in the mobile phone with the aid of Abaqus commercial software and verification experiment conducted in anechoic chamber. Due to rapid technological development, the mobile phone has not only become a communication device, but also a daily necessity. In addition to the requirement for slim design, improvements are needed in the clarity and quality of sound, especially for the microphone system at higher frequencies. One of the influencing factors is the baffled effect from the panel design, especially in the smart phone. Thus, this paper mainly focuses on the influence of this effect in the mobile phone panel. The results revealed the optimal location of microphone receiving hole using Abaqus software, tested in anechoic chamber. With Abaqus software, the existence of baffled effect in the mobile phone panel can be clearly demonstrated, especially at higher frequencies. Moreover, the variations and relationships of sound field with different sizes and positions of panel can be analyzed. Many commercial mobile phones are also modelled using FEM software, with verification in anechoic chamber. There is perfect agreement between simulated and experimental results. Transferred frequency, in the range of 5 kHz to 6 kHz, causes sound pressure to drastically change and may prove useful in the design process. Finally, all receiving characteristics of microphone system, including the influence of internal components and external baffled effect, had been programmed and integrated in a graphic user interface (GUI) system.

关键词： Finite element method

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Generation of the anti-Twist crowned helical gear by modifying the gear rotation angle in the hobbing process 2nd

Generation of the anti-Twist crowned helical gear by modifyi...

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2nd International Conference on Machining, Materials and Mechanical Technologies, IC3MT 2016

作者： Hsu, Ruei-Hung Wu, Yu-Ren Chen, shih-sheng Bachelor's Program in Precision System Design Feng Chia University Taiwan Department of Mechanical Engineering National Central University Taiwan

ISBN: (纸本)9783035711011

In the gear-hobbing process, the work gear tooth flank is usually longitudinally crowned by varying the center distance between the hob and the work gear. Without crossed angle compensation, however, this center distance variation produces a twisted tooth flank on the work gear. This paper therefore proposes a methodology to reduce this tooth flank twist and achieve anti-Twist in longitudinal crowning by modifying the gear rotation angle in the hobbing process which is practiced using a CNC hobbing machine with three synchronous axes. © 2017 Trans Tech Publications, switzerland.

关键词： Helical gears

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Development of a systematic simulation procedure for 2D moving-coil loudspeaker by using COMsol multiphysics 25

Development of a systematic simulation procedure for 2D movi...

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25th International Congress on sound and Vibration 2018: Hiroshima Calling, ICsV 2018

作者： Liu, Y.C. Lin, Ku-sheng Feng Chia University Bachelor's Program in Precision System Design Taichung Taiwan Feng Chia University Master's Program of Electro-Acoustics Taichung Taiwan

ISBN: (纸本)9781510868458

This article develops a robust simulation procedure to predict the electromagnetic and acoustic properties of loudspeaker with commercial finite element software. The performance of loudspeaker is essentially difficult to analyse and predict, not to mention the conditions without the design specifications. With the aid of FEMM, FINEMotor, Klippel system, and soundCheck system, thus, a simulation procedure applied in the commercial finite element software-COMsOL Multiphysics is created in this article. Through the optimizations of magnetic resistance, relative permeability coefficient in the electromagnetic part, and Young's modulus and loss factor in the mechanical part, simulation results were in good agreement with actual measurements. After repeated verifications, this finite element simulation procedure is not only suitable for the predictions of loudspeaker performance, but also speed up the traditional simulation. © 25th International Congress on sound and Vibration 2018, ICsV 2018: Hiroshima Calling. All rights reserved.

关键词： Loudspeakers

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Research on the coupling of electroacoustics and performance space 27

Research on the coupling of electroacoustics and performance...

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27th International Congress on sound and Vibration, ICsV 2021

作者： Liu, Yu-Cheng Po-Chun, Ting Master's Program of Electro-Acoustics Feng Chia University Taiwan Bachelor's Program in Precision System Design Feng Chia University Taiwan Feng Chia University Taiwan

ISBN: (纸本)9788378807995

There are many various types of performances choosing to use indoor venues in recent years, but most of the arenas' acoustics in the early design is based on events, speeches and orchestra[1][2][3]. Now, due to the change of performance types, there is a need for change to increase the electro-sound and Louder-speaker system to enhance the sound pressure and music's dynamic at the venues[4]. At present, the venues for indoor performances are often in short supply, so the shows production team must perform in not so acoustically ideal conditions, such as balcony floor between the audience when in the large sound pressure, because the mezzanine factor caused the perception of the sound[5] and other roofless space is much worse, as the clarity and the overall sense of space are often a matter of audience reaction. © "Advances in Acoustics, Noise and Vibration - 2021" Proceedings of the 27th International Congress on sound and Vibration, ICsV 2021. All rights reserved.

关键词： Acoustic fields

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Multiscale spectral subtraction method and support vector machine for clustering heavy background noise classification 24

Multiscale spectral subtraction method and support vector ma...

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24th International Congress on sound and Vibration, ICsV 2017

作者： Tsai, Yu-Ting Huang, Jin H. Feng Chia University Bachelor's Program in Precision System Design Taichung Taiwan Feng Chia University Department of Mechanical and Computer-Aided Engineering Taichung Taiwan

For measuring the rotation engine vibration signals, the mechanical or acoustical sensors are dif-ficult to get the clean signals from the heavy background noise of the machinery environment. The noise reduction algorithm may anticipate to decrease the background noise without disturbing the unpolluted signal. The spectral subtraction methods for noise attenuation case are reached for many years due to its simple and effectively. In this paper, the proposed algorithm incorporates the multiscale spectral subtraction method (Mss) with voice activity detector (VAD) and sup-ports vector machine (sVM) for removing the background noise, since sVM can be required for distinguishing a multivariate signal into separated subcomponents. From the analysis case for the rotating machinery, Mss shows that the low frequency with their harmonics frequencies can be tracked through the clustering of the data from sVM. The present method is helpful in background noise and signal compartmentalization as its application can significantly lower the requirement for labelled training cases in both the inductive noise and wanted signals.

关键词： support vector machines

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Finite Element simulation Analysis and Verification of Broadband silencers

Finite Element Simulation Analysis and Verification of Broad...

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2019 International Conference on Modeling, simulation, Optimization and Numerical Techniques(sMONT 2019)

作者： Y.C.Liu Y.C.Huang Yunjhe Tang Yungfang Chen Bachelor's Program in Precision System Design Feng Chia University

ISBN: (纸本)9781510885455

silencers have widespread applications. In industrial settings they are used at large-scale combustion, gas turbine, blower and compressor system junction points to control noise. The most common methods of noise elimination via silencer are varying of the size and cross-sectional area of the transmission pipe such that during sound wave transmission, non-uniform impedance is produced. Partial sound wave reflection is an echo source or consumes the energy of transmitted sound waves to achieve noise elimination. In this study, COMsOL Multiphysics, commercial finite element analysis and simulation software, was the main analytical tool. The aim of this study was to investigate the effects of variations in silencer structure on acoustic attenuation. Based on finite element method simulation, the optimal silencer geometry for noise cancellation was determined.

关键词： silencer transmission loss finite element simulation

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Rotor load analysis method for twin screw compressors with considering gaseous pressure and working temperature 14

Rotor load analysis method for twin Screw compressors with c...

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14th International Federation for the Promotion of Mechanism and Machine science World Congress, IFToMM 2015

作者： Hsu, Ruei-Hung Wu, Yu-Ren Wu, Wei-Te Tran, Van-The Bachelor's Program in Precision System Design Feng Chia University Taichung Taiwan Department of Mechanical Engineering National Central University Taoyuan Taiwan Department of Biomechatronics Engineering National Pingtung University of Science and Technology Pingtung Taiwan

ISBN: (纸本)9789860460988

screw rotors of a twin screw compressor often deform and interfere due to the cyclic gas pressure and working temperature, which lead to noise, vibration and abrasion of the screw rotors. Therefore, this paper proposed a simplified CAE (Computer Aided Engineering) method instead of the past massive and complex CFD (Computational Fluid Dynamics) method to simulate and estimate reasonably the screw rotor load and deformation with considering the gas pressure and working temperature applied on its operating process. The analysis results could provide the possible maximum rotor deformation and cyclic load acting on the rotors for design consideration.

关键词： Deformation

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Optimal design of Investment Casting system for a stuffing Box with Pedestal of Centrifugal Pump: Computer simulations and Experimental Verification

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Journal of the Chinese society of Mechanical Engineers, Transactions of the Chinese Institute of Engineers, series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao 2020年第5期41卷 551-563页

作者： Kuo, Jenn-Kun Huang, Pei-Hsing Tsai, Yu-Ting Zhong, Qi Chou, Chuen-shii Department of Greenergy National University of Tainan Tainan70005 Taiwan Department of Mechanical Engineering National Yunlin University of Science and Technology Yunlin64002 Taiwan Bachelor's Program in Precision System Design Feng Chia University Taichung40724 Taiwan Department of Mechanical Engineering National Pintung University of Science and Technology Pingtung91201 Taiwan

The stuffing box with pedestal (sBP) is a major component in centrifugal pumps (CPs). It is responsible for the transfer of load generated in the CP to the baseplate of the pump and finally to the ground. sBPs are usually fabricated using investment casting;however, this process is prone to residual casting defects, which can reduce mechanical strength and increase the likelihood of crack formation following long-term usage. In this study, the AnyCasting numerical simulation software package was used to optimize the investment parameters for the casting of an sBP in sUs304 alloy. Optimization efforts targeted the shrinkage cavity (based on retained melt modulus) and porosity defects (based on Niyama criterion). The results of preliminary simulations and experiments informed the establishment of five casting schemes for subsequent simulation. We used virtual thermo-dynamic sensors to determine the rate and direction of solidification in the mold cavity, and also investigated variations in the velocity of the molten metal at the inlets of the gating system as a function of time. The optimal casting parameters derived in simulations were assessed by fabricating an sBP via investment casting in a domestic foundry. Nondestructive testing based on X-ray analysis revealed none of the detrimental defects commonly associated with this type of casting. © 2020, Chinese Mechanical Engineering society. All right reserved.

关键词： Investment casting

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study on the Characteristics of Acoustic Radiation of Microspeaker Associated with Pattern of Diaphragm with Finite Element Method

Study on the Characteristics of Acoustic Radiation of Micros...

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2018 3rd International Conference on Computational Modeling, simulation and Applied Mathematics (CMsAM 2018)

作者： Yu-Cheng Liu En-Tzu Chang Hung-Wei Chen Bachelor's Program in Precision System Design Feng Chia University Master's Program of Electro-Acoustics Feng Chia University

The objective of this study is to investigate the acoustic radiation of Microspeaker based on various pattern geometries of diaphragm. The influence of first resonant frequency(f) is discussed, as are the radiation efficiency(sPL) and impedance curve(IMP). First, microspeaker geometry was reconstructed with CAD software(Creo). Four geometric pattern parameters, width, angle, depth, and quantity, of microspeaker diaphragm were defined and simulated with commercial finite element software-COMOsL Multiphysics. Results showed that the quantity and depth of pattern significantly influenced on the acoustic radiation, especially at lower frequencies. The stiffness of diaphragm decreased with increases in quantity and depth of pattern. In addition, f for both conditions shifted to lower frequency and bandwidth of microspeaker was extended. Increasing the angle of pattern, resulted in more solid diaphragm and slight increase in efficiency.

关键词： Microspeaker Pattern of diaphragm Finite element method

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Parametric Analysis on the Geometry of Magnetic system for subwoofer with FEMM

Parametric Analysis on the Geometry of Magnetic System for S...

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2018 3rd International Conference on Computational Modeling, simulation and Applied Mathematics (CMsAM 2018)

作者： Yu-Cheng Liu shu-Chien Wu Jiun-Yen Chen Bachelor's Program in Precision System Design Feng Chia University Master's Program of Electro-Acoustics Feng Chia University

The aim of this study is to investigate the distributions of magnetic flux and the variations in B curve for a novel design of loudspeaker magnetic system. Two different geometries, simulated with commercial finite element software-(FEMM) are presented, as well as an optimized design for the geometry of magnetic system. Results showed that changes in the inner side geometry obviously influence the distributions of magnetic field. In addition, the maximal magnetic force shifts to the position of lowest cross-sectional area. Meanwhile, B curve not only reduces the B level, but also loses the original uniformity in the air gap. Thus, the distortion caused from magnetic system will increase. Based on the original design, the new design not only maintains the flat B curve, but also saves on the amount of material of required for the magnetic system by around 31%.

关键词： subwoofer Magnetic flux B curve NRT Finite element method

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