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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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Study on the baffled effect of mobile phone panel 24

Study on the baffled effect of mobile phone panel

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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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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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Online measurement of polymer melt viscosity in injection molding 75

Online measurement of polymer melt viscosity in injection mo...

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75th Annual Technical Conference and Exhibition of the Society of Plastics Engineers, SPE ANTEC Anaheim 2017

作者： Huang, Ming-Shyan Nian, Shih-Chih Chen, Jian-Yu Yang, Kai-Jye Tseng, Jian-Chou Dept. of Mechanical and Automation Engineering National Kaohsiung First University of Science and Technology Taiwan Dept. of Power Mechanical Engineering National Taitung College Taiwan Bachelor Program in Precision System Design Feng Chia University Taiwan

ISBN: (纸本)9780692883099

Melt viscosity, determined by the shear rate, barrel temperatures, and pressure during plasticization, greatly affects the flow ability of polymer melts as well as the quality of injection-molded parts. In particular, the consistency of molding qualities is highly relevant to the plasticizing quality at each cycle (i.e., injection molding requiring a high yield rate highly relies on the stability of polymer melts). However, numerous factors affect the plasticizing quality, including the geometry of injection screws, processed polymer materials, processing parameters of plasticization such as the feeding rate, screw rotational speed, barrel temperatures, back pressure, and screw backward speed. The conventional approach of plasticization in injection molding machines uses a single reciprocating screw for conveying, melting, and metering polymer melts. The plasticizing quality is roughly adjusted by indirectly controlling barrel temperatures;thus, the melt viscosity varies. An in-suit approach of assuring melt quality is to measure the melt viscosity variation online, which is a more suitable indicator of the plasticizing quality than temperature. This study thus monitored the melt viscosity variations in polymer melts by using in-mold pressure sensors. Furthermore, the effects of the injection velocity and mold temperature on the melt viscosity variations were examined.

关键词： Polymer melts

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A Numerical Method for Reversely Generating a Pair of Conjugated Rotor Profiles of Twin-screw Compressor from the Measured Profile Data

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Procedia CIRP 2017年 63卷 483-487页

作者： Ruei-Hung Hsu Yu-Ren Wu Zi-An Chen Bachelor's Program in Precision System Design Feng Chia University Taiwan R.O.C. Department of Mechanical Engineering National Central University Taiwan R.O.C.

Reverse engineering technique is generally practiced to reconstitute the original conjugated rotor profiles from the measured point data with profile deviation for further evaluating performance of the competitor's same-level products in the twin-screw compressor manufacturing industry. However, it is time-consuming when synthesizing and restoring the original rotor profiles via either trial or enveloping methods. This paper proposed a numerical method, named meshing clearance elimination (MCE) method, for approaching pairs of conjugated male and female rotor profiles from the discrete measured profile points. By using this method, the clearance between two screw rotors can be attained via the normal rack generation computation and then eliminated by proportionally distribute the normal compensation onto the measured rotor profiles to obtain the “ideal” rotor profiles to avoid numerical divergence in the following compressor performance computation. Two kinds of rotor profiles measured from CMM (Coordinates Measurement Machine) were demonstrated in the numerical examples to show the effectivity and advantages of the MCE method.

关键词： twin-screw compressor rotor profile meshing clearance

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Application of programmable Logic Controller to Build-up an Intelligent Industry 4.0 Platform

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Procedia CIRP 2017年 63卷 150-155页

作者： Jian-Yu Chen Kuo-Cheng Tai Guo-Chin Chen Bachelor's Program of Precision System Design Feng Chia University No. 100 Wenhwa Rd. Seatwen Taichung 407 Taiwan Department of Mechanical and Computer-Aided Engineering Feng Chia University No. 100 Wenhwa Rd. Seatwen Taichung 407 Taiwan

Industry 4.0 is initiated by the German government as a high level technology strategy in order to keep Germany in a global leading position in manufacturing, also intends to solve energy and aging issues in parallel. Germany has proposed the “Reference Architecture Model Industries 4.0” which is based on the regulations published by the International Electrotechnical Commission. The manifestation of Industry 4.0 can be achieved by the realization of digital factory. And it's emphasized on total integration with Cyber Physical system as its core technology, via Internet of Things to realize the operational environment of human machine interaction, and the utilization of Big Data for decision making. The research motivation of this thesis is to utilize Totally Integrated Automation Portal as a digital factory software development platform, to achieve the fundamental educational requirements of digital factory, and to understand Industry 4.0 concept. Methodology of this research is based on a set of experimental and training mechanism, the sequence of machine movements is controlled by a programmable Logic Controller, and this PLC has to be complied with IEC61131 International Standard. Regarding communication technology also to be complied with IEC61158 and IEC62541 e.g. PROFINET and OPC UA protocol. And finally realizing the operational environment of human machine interaction via smart phone according to the outcome of this research, it has been shown that total integration concept can be realized by single production machine. By standardization of factory environment and increasing the level of operational environment of human machine interaction, productivity and quality of production could be significantly increased. PLC could be used to analyze intelligent platform and comply with the Industry 4.0 standard at the same time.

关键词： I4.0 Digitalization Factory PLC and IEC61131

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Crowning Analysis of Involute Helical Pairs Shaved by CNC Gear Shaving Machine with Two Synchronous Axes

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IOP Conference Series: Materials Science and Engineering 2018年第1期417卷

作者： Ruei-Hung Hsu Shih-Sheng Chen Bachelor Program in Precision System Design Feng Chia University No. 100 Wenhwa Road Seatwen Taichung 407 Taiwan Department of Mechanical Engineering National Chung Hsing University No. 250 Kuo-Kuang Road Taichung 40227 Taiwan

Gear Shaving is one of the most efficient and economical ways to finish gears after gear hobbing or gear shaping. In tradition, the shaved gear can be crowning by shaving machine with the rocking mechanism. In this paper, we propose a mathematical model of a CNC shaving machine with two synchronous axes. The proposed mathematical model can be used to calculate the crowning tooth surface of the gear in parallel-shaving process.

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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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Challenge - Naval force development

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Naval Engineers Journal 2004年第3期116卷 57-62页

作者： Hamilton, Charles S. Program Executive Officer for Ships REAR ADMIRAL HAMILTON is a native of Amityville New York. He attended Duke University graduating in May 1974 with a bachelor of science in zoology. He was commissioned in the Navy in May 1974 through the NROTC Program at Duke. Rear Adm. Hamilton's sea tours include electronics material officer and combat information center officer in USS Hawkins (DD 873) (1974 to 1976) fire control officer and missile officer in USS Coontz (DDG 40) (1976 to1978) operations officer in USS Callaghan (DDG 994) (1981 to 1984) executive officer USS Fox (CG 33) (1986 to 1988) and commanding officer USS O'Brien (DD 975) (1991 to 1993). Rear Adm. Hamilton's shore tours include anti-submarine warfare program analyst and administrative assistant to director Program Resource Appraisal Division (OP-91) Office of the Chief of Naval Operations (1984 to 1986) head Aegis Destroyer Section (OP-355F) and financial coordinator Aegis Cruiser Destroyer Branch Office of the Chief of Naval Operations (1988 to 1990) and military staff specialist for naval war-fare in the Office of the Under Secretary of Defense (Acquisition and Technology) (1994 to 1996). In May 1996 Rear Adm. Hamilton became program manager for the arsenal ship which was designed to provide massed precision fires in support of Fleet commander's warfighting requirements. After completing the first two design phases and passing significant acquisition reform lessons learned to the DD 21 Program Office Rear Adm. Hamilton closed down the Arsenal Ship Program in March 1998. From April 1998 to February 2000 Rear Adm. Hamilton served as deputy for Fleet in the Program Executive Office Theater Surface Combatants (PEO TSC-F). In this position he was responsible for Fleet Introduction and Lifetime Support of 120 surface combatants (DDG 51 CG 47 DDG 993 DD 963 FFG 7). Rear Adm. Hamilton served as program executive officer for Surface Strike (PEO (S)) from February 2000 until November 2002. As PEO (S) he managed the Zumwalt-class DD 21/DD (X) N

The challenges which stood as an obstacle to the naval force development are discussed. The main challenge in the national security environment is to be virtually available anywhere in the world at the behest of the national command. It is observed that in surface warefare coast guard has the most applicability and expansion of their surveillance area will help in engaging other vessels away from the manned platform. It is also observed that the relationship with mission modularity and the growth between the coast guard and the navy has attracted interest among the international community.

关键词： Marine engineering

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