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Spatially filtered multi-field responses of piezothermoelastic cylindrical shell composites
Tzou, H.S.,Bao, Y. Techno-Press 1996 Structural Engineering and Mechanics, An Int'l Jou Vol.4 No.2
New active "intelligent" structural systems with integrated self-sensing, diagnosis, and control capabilities can lead to a new design dimension for the next generation high-performance structures and mechanical systems. However, temperature effects to the piezoelectric transducers are not fully understood. This paper is concerned with a mathematical modeling and analysis of a laminated piezothermoelastic cylindrical shell composite exposed to mechanical, electric, and thermal fields. Generic shell equations and solution procedures are derived. Contributions of spatial and time components in the mechanical, electric, and temperature excitations are discussed, and their analytical solutions derived. A laminated cylindrical shell composite with fully distributed piezoelectric layers is used in a case study; its multi-field step and impulse responses are investigated. Analyses suggest that the fully distributed actuators are insensitive to even modes due to load averaging and cancellation. Accordingly, these even modes are filtered from the total response and only the modes that are combinations of m = 1, 3, 5, ${\cdots}$ and n = 1, 3, 5, ${\cdots}$ participating in dynamic response of the shell.
Study on Rotating Compression Forming of Double-layer Clad Ring Considering Coulomb Friction
Gow-Yi Tzou,Yeong-Maw Hwang,Hsiang-Yu Teng 한국정밀공학회 2014 International Journal of Precision Engineering and Vol.1 No.3
This study uses two FEM simulations based on deform 3D and superform commercial software assuming coulomb friction to explore the plastic behavior in rotating compression forming of double-layer bounded clad ring. The rotating compression forming can reduce the compressive force and make the deformation uniform. Effects of the frictional coefficient, shear yield stress ratio, rotating angular velocity, frictional coefficient ratio, clad ring height ratio etc on compression characteristics including the effective stress, the effective strain, the velocity field, the shear strain, the compressive force etc. are investigated effectively. Moreover, the realistic rotating compression experiments of clad ring have been carried out to verify the acceptance of both FEM simulation models.
( Kanokchan Sanoppa ),( Tzou-chi Huang ),( Ming-chang Wu ) 한국미생물 · 생명공학회 2020 한국미생물·생명공학회지 Vol.48 No.1
The aim of this study was to investigate the effects of Torulaspora delbrueckii and Saccharomyces cerevisiae, as pure fermenters and mixed fermenters (simultaneous and sequential culture), on the production of nonvolatiles and volatiles, and on the antioxidant activity in Golden Dried Longan juice and Golden Dried Longan wines. Alanine, arginine, glutamic acid, leucine, proline, and gamma-aminobutyric acid (GABA) were the most prominent amino acids that were found in these wines. The Golden Dried Longan Wine fermented with monocultures of S. cerevisiae and T. delbrueckii produced a total volatile aroma content of 393.21 mg/l and 383.20 mg/l, respectively. Simultaneous culture of the two organisms produced the highest total volatile aroma content, that affected most volatile compounds including isobutanol, ethyl acetate, ethyl decanoate, ethyl heptanoate, ethyl hexanoate, ethyl pentanoate, isoamyl acetate, and isobutyl acetate. Of the four treatments, the sequential culture possessed the highest total phenolic content (5.80 mg gallic acid equivalents (GAE)/ml). In addition, the total phenolic content significantly correlated with the antioxidant activity of the Golden Dried Juice and Golden Dried Longan Wine. These results suggest that co-cultures of the two organisms used in the production of the Golden Dried Longan Wine may improve the intensity and complexity of its aroma.
Evaluation of Heat Transfer in Acupuncture Needles: Convection and Conduction Approaches
Ya-Chien Chung,Chieh-Han John Tzou,Tzyy-Yih Yang 사단법인약침학회 2015 Journal of Acupuncture & Meridian Studies Vol.8 No.2
Originating in ancient China, acupuncture using needles has been developed for thousands of years and has received attention for its reported medical remedies, such as pain relief and chronic disease treatment. Heat transfer through the needles, which might have effects on the biomechanism of acupuncture, providing a stimulus and regulating homeostasis, has never been studied. This article analyzes the significance of heat transfer through needles via convection and conduction, approached by means of computational analysis. The needle is a cylindrical body, and an axis symmetrical steady-state heat-transfer model that viscosity and static pressure was not applied. This article evaluates heat transfer via acupuncture needles by using five metal materials: silver, copper, brass, iron, and stainless steel. A silver needle of the type extensively applied in acupuncture can dissipate more than seven times as much heat as a stainless steel needle of the same type. Heat transfer through such a needle is significant, compared to natural body-energy consumption over a range of ambient temperatures. The mechanism by which heat flows in or out of the body through the needles may be crucial in the remedial efficacy of acupuncture.
FEM ANALYSIS AND EXPERIMENT VALIDATION ON MULTI-PASS FORGING OF TORX ROUND FLANGE BOLT
Shih-Hsien Lin,Dyi-Cheng Chen,Un-Chin Chai,Gow-Yi Tzou 한국자동차공학회 2020 International journal of automotive technology Vol.21 No.5
This study aims at exploring the multi-pass forging of Torx Round Flange Bolt (automotive fastener) to simulate each pass forging process using FEM simulation. The software is used to carry out the simulation analysis. Constant shear friction is always assumed at the interface between die and workpiece to explore the effective stress, the effective strain, the velocity filed, and the forging force for each pass. Through the pass schedule plan and design based on FEM analysis, the four-pass forging process is designed to form the Torx Round Flange Bolt compared the five-pass forging. It is noted that the total forging force is 1204kN, so the 200 tons machinery in the factory can be chosen to manufacture this automotive fastener. The die stress analysis for each pass has been explored to realize whether the dies are damaged or not. The forming feasibility of Torx Round Flange Bolt can be performed by FEM simulation. All dies designs and forming results can be proposed to the dies manufacture so as to perform the realistic experiments. Comparisons between FEM and experiment for final product dimensions can be carried out. The maximum dimension error is just around 3.32% to show a good agreement with the experiment. The research results can provide to the industries as the references of establishment of multi-pass forging technology.