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Rapid Springback Compensation for Age Forming Based on Quasi Newton Method

Chinese Journal of Mechanical Engineering 2014年第3期27卷 551-557页

作者： XIONG Wei GAN Zhong XIONG Shipeng XIA Yushan department of Mechanical Engineering Guilin University of Aerospace Technology Key Laboratory of Contemporary design and Integrated manufacturing Technology of Ministry of Education Northwestern Polytechnical University

Iterative methods based on finite element simulation are effective approaches to design mold shape to compensate springback in sheet metal forming. However, convergence rate of iterative methods is difficult to improve greatly. To increase the springback compensate speed of designing age forming mold, process of calculating springback for a certain mold with finite element method is analyzed. Springback compensation is abstracted as finding a solution for a set of nonlinear functions and a springback compensation algorithm is presented on the basis of quasi Newton method. The accuracy of algorithm is verified by developing an ABAQUS secondary development program with MATLAB. Three rectangular integrated panels of dimensions 710 mmx750 mm integrated panels with intersected ribs of 10 mm are selected to perform case studies. The algorithm is used to compute mold contours for the panels with cylinder, sphere and saddle contours respectively and it takes 57%, 22% and 33% iterations as compared to that of displacement adjustment （DA） method. At the end of iterations, maximum deviations on the three panels are 0.618 4 mm, 0.624 1 mm and 0.342 0 mm that are smaller than the deviations determined by DA method （0.740 8 mm, 0.740 8 mm and 0.713 7 mm respectively）. In following experimental verification, mold contour for another integrated panel with 400 ram^380 mm size is designed by the algorithm. Then the panel is age formed in an autoclave and measured by a three dimensional digital measurement devise. Deviation between measuring results and the panel＇s design contour is less than 1 mm. Finally, the iterations with different mesh sizes （40 mm, 35 mm, 30 mm, 25 mm, 20 mm） in finite element models are compared and found no considerable difference. Another possible compensation method, Broyden-Fletcher-Shanmo method, is also presented based on the solving nonlinear fimctions idea. The Broyden-Fletcher-Shanmo method is employed to compute mold contour for the second panel. It

关键词： age forming quasi Newton method springback compensation mold design displacement adjustment method

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Middle range wireless power transfer systems with multiple resonators

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Journal of Central South University 2015年第6期22卷 2127-2136页

作者：陈新张桂香 State Key Laboratory of Advanced design and manufacturing for Vehicle Body (Hunan University) department of Energy and Electrical Engineering Hunan University of Humanities Science and Technology

The equivalent two-port network model of a middle range wireless power transfer(WPT) system was presented based on strongly coupled multiple resonators. The key parameters of the WPT system include self-inductance, resistance, parasitic capacitance, mutual inductance and S-parameters of coils & resonators were analyzed. The impedance matching method was used to optimize load power and transmission efficiency of the multi-resonator WPT system, and the impedance matching method was realized through adjusting the distances between the coils and resonators. Experiments show that the impedance matching method can effectively improve load power and transmission efficiency for middle range wireless power transfer systems with multiple resonators, at distances up to 3 times the coil radius with efficiency more than 70% and load power also close to 3.5 W.

关键词： wireless power transfer middle range multiple resonators S-parameters two-port network impedance matching

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Transforming Multidisciplinary Customer Requirements to product design Specifications

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Chinese Journal of Mechanical Engineering 2017年第5期30卷 1069-1080页

作者： Xiao-Jie Ma Guo-Fu Ding Sheng-Feng Qin Rong Li Kai-Yin Yan Shou-Ne Xiao Guang-Wu Yang Institute of Advanced design and manufacturing Southwest Jiaotong University School of design Northumbria University State Key Laboratory of Traction Power Southwest Jiaotong University

With the increasing of complexity of complex mechatronic products, it is necessary to involve multidis- ciplinary design teams, thus, the traditional customer requirements modeling for a single discipline team becomes difficult to be applied in a multidisciplinary team and project since team members with various disciplinary backgrounds may have different interpretations of the customers＇ requirements. A new synthesized multidisci- plinary customer requirements modeling method is pro- vided for obtaining and describing the common understanding of customer requirements （CRs） and more importantly transferring them into a detailed and accurate product design specifications （PDS） to interact with dif- ferent team members effectively. A case study of designing a high speed train verifies the rationality and feasibility of the proposed multidisciplinary requirement modeling method for complex mechatronic product development. This proposed research offersthe instruction to realize the customer-driven personalized customization of complex mechatronic product.

关键词： Complex mechatronic product Crowdsourcing - Multidisciplinary customer requirementsmodeling Disciplinary specialty language dictionary High-speed train

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UNCOVERING BENEFITS AND RISKS OF INTEGRATED product SERVICE OFFERINGS-USING A CASE OF TECHNOLOGY ENCAPSULATION

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Journal of Systems Science and Systems Engineering 2013年第4期22卷 421-439页

作者： Tomohiko SAKAO Anna HRWALL RNNBCK Gunilla LUNDH SANDSTRM Division of Environmental Technology and Management Department of Management and Engineering Division of Industrial Economics Department of Management and EngineeringLinkoping UniversitySweden Unit of Integrated product Development Department of Machine DesignKTH Royal Institute of TechnologySweden

The objective of this article is to uncover benefits and risks of Integrated product Service Offering （IPSO） in a systematic manner. To do so, it adopts an explorative longitudinal in-depth case study （development of an IPSO based on a new technology） and adds insights to the existing literature. The article first proposes a theoretical and generic framework termed the PCP （Provider - Customer - product） triangle with associated information flow and uncertainty. Second, various types of benefits and risks are presented based on the framework. Among others, the benefit of keeping IPR （Intellectual Property Rights） with the provider and the risk of regulation change are new findings from the case study. In addition, the case study reveals that IPSO is regarded as a positive contributor to innovation. Applying the framework and classification of benefits and risks as norms to other cases has yet to be done for verification. However, the framework contributes scientifically to a better understanding of the benefits and risks of IPSO. In addition, this framework is advantageous with its easiness to understand, which contributes practically to the dissemination of IPS0 insight to industry.

关键词： product/service system (PSS) new technology intellectual property right (IPR) time to market innovation uncertainty

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Effect of Alloying Element Antimony on Macrostructural and Microstructural Development in A356 Alloy Directionally Solidified under Unsteady-state Conditions

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Journal of Materials Science & Technology 2008年第1期24卷 25-28页

作者： Supparerk Boontein Julathep Kajornchaiyakul Chaowalit Limmaneevichitr School of Energy Environment and Materials King Mongkut's University of Technology ThonburiBangkokThailand Materials Technology for manufacturing design and product Development National Metal and Materials Technology CenterPrathumthaniThailand production Engineering department Faculty of Engineering King Mongkut's University of Technology ThonburiBangkokThailand

Microstructure development is well accepted to have a major effect on mechanical properties during its services. One of the most interesting ways to improve mechanical properties is to reduce secondary dendrite arm spacing （SDAS）.SDAS also plays an important role in controlling and providing the well distributed and fine microstructure resulting in better tensile strength and *** reduce SDAS,it is commonly known by increasing cooling rate and increasing interface instability by limited-soluble alloy *** is,however, unclear that how both cooling rate and limited-soluble alloy,***,relate to each *** may be the reason that the limited-soluble alloy may not effectively reduce *** better understand this phenomenon, influences of Sb on solid/liquid interface instability using columnar to equiaxed transition （CET） were studied in the directionally solidification *** macrographs and micrographs,it was observed that at 0.06-0.18 wt pct Sb the CET min,CET max,CET zone and %CET area gradually *** increases of CET max and CET zone in samples with 0.06 to 0.18 wt pct Sb addition results from recalesced *** the other hand,the variations of CET max and CET zone in samples with 0.24 to 0.30 wt pct Sb results from equiaxed grain formations that prohibit the growth of columnar grain and latent heat from intermetallic phase solidified.

关键词： Directional solidification Antimony Al-Si alloy

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Effect of fusion welding processes on tensile properties of armor grade, high thickness, non-heat treatable aluminium alloy joints

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Defence Technology（防务技术） 2019年第3期15卷 353-362页

作者： K. Vasu H. Chelladurai Addanki Ramaswamy S. Malarvizhi V. Balasubramanian department of Mechanical Engineering PDPM Indian Institute of Information Technology Design and Manufacturing Jabalpur Madhya pradesh 482005 India Centre for Materials Joining & Research (CEMAJOR) Department of Manufacturing Engineering Annamalai University Annamalai Nagar -(P.O) Tamil nadu 608002 India

AA5059 is one of the high strength armor grade aluminium alloy that finds its applications in the military vehicles due to the higher resistance against the armor piercing (AP) threats. This study aimed at finding the best suitable process among the fusion welding processes such as gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW) by evaluating the tensile properties of AA5059 aluminium alloy joints. The fracture path was identified by mapping the low hardness distribution profile (LHDP) across the weld cross section under tensile loading. Optical and scanning electron microscopies were used to characterize the microstructural features of the welded joints at various zones. It is evident from the results that GTAW joints showed superior tensile properties compared to GMAW joints and this is primarily owing to the presence of finer grains in the weld metal zone (WMZ) and narrow heat-affected zone (HAZ). The lower heat input associated with the GTAW process effectively reduced the size of the WMZ and HAZ compared to GMAW process. Lower heat input of GTAW process results in faster cooling rate which hinders the grain growth and reduces the evaporation of magnesium in weld metal compared to GMAW joints. The fracture surface of GTAW joint consists of more dimples than GMAW joints which is an indication that the GTAW joint possess improved ductility than GMAW joint.

关键词： Gas tungsten arc welding Gas metal arc welding Armor grade aluminium alloy Tensile properties Microhardness

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Nanotribological properties and scratch resistance of MoS_(2)bilayerona SiO_(2)/Si substrate

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Friction 2023年第1期11卷 154-164页

作者： Si-hwan KIM Hyo-sok AHN department of Transdisciplinary Studies Seoul National UniversitySeoul 08826Republic of Korea department of manufacturing Systems and design Engineering Seoul National University of Science and TechnologySeoul 08826 Republic of Korea

The tribological properties and scratch resistance of MoS_(2)bilayer deposited on SiO_(2)/Si substrates prepared via chemical vapor deposition are *** force microscopy(FFM)is employed to investigate the friction and wear properties of the MoS_(2)bilayer at the nanoscale by applying a normal load ranging from 200 to 1,000 *** resistance is measured using the scratch mode in FFM based on a linearly increasing load from 100 to 1,000 *** probe force microscopy(KPFM)is performed to locally measure the surface potential in the tested surface to qualitatively measure the wear/removal of Mos,layers and identify critical loads associated with the individual failures of the top and bottom *** analysis of the contact potential difference values as well as that of KPFM,friction,and height images show that the wear/removal of the top and bottom layers in the MoS_(2)bilayer system occurred *** FFM and KPFM results show that the top MoS_(2)layer begins to degrade at the end of the low friction stage,followed by the bottom layer,thereby resulting in a transitional friction stage owing to the direct contact between the diamond tip and SiO_(2)*** the stable third stage,the transfer of lubricious MoS_(2)debris to the tip apex results in contact between the MoS_(2)-transferred tip and SiO_(2).Nanoscratch test results show two ranges of critical loads,which correspond to the sequential removal of the top and bottom layers.

关键词： chemical vapor deposition(CVD)-grown MoS,bilayer friction force microscopy(FFM) nanoscratch test Kelvin probe force microscopy(KPFM) scratch resistance

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RapidET:a MEMS-based platform for label-free and rapid demarcation of tumors from normal breast biopsy tissues

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Microsystems & Nanoengineering 2022年第1期8卷 123-138页

作者： Anil Vishnu G.K Gayatri Gogoi Bhagaban Behera Saeed Rila Annapoorni Rangarajan Hardik J.Pandya Center for BioSystems Science and Engineering Indian Institute of ScienceBangaloreKarnatakaIndia department of Pathology Assam Medical CollegeDibrugarhAssamIndia department of Electronic Systems Engineering Indian Institute of ScienceBangaloreKarnatakaIndia department of Molecular Reproduction Developmentand GeneticsIndian Institute of ScienceBangaloreKarnatakaIndia Centre for product design and manufacturing Indian Institute of ScienceBangaloreKarnatakaIndia

The rapid and label-free diagnosis of malignancies in ex vivo breast biopsy tissues has significant utility in pathology laboratories and operating *** report a MEMS-based platform integrated with microchips that performs phenotyping of breast biopsy tissues using electrothermal *** microchip,fabricated on a silicon substrate,incorporates a platinum microheater,interdigitated electrodes(IDEs),and resistance temperature detectors(RTDs)as on-chip sensing *** microchips are integrated onto the platform using a slide-fit contact enabling quick replacement for biological *** bulk resistivity(ρB),surface resistivity(ρS),and thermal conductivity(k)of deparaffinized and formalin-fixed paired tumor and adjacent normal breast biopsy samples from N=8 patients were *** formalin-fixed samples,the meanρB for tumors showed a statistically significant fold change of 4.42(P=0.014)when the tissue was heated from 25°C to 37°C compared to the adjacent normal tissue,which showed a fold change of *** meanρS measurements also showed a similar *** mean k of the formalinfixed tumor tissues was 0.309±0.02Wm^(-1)K^(-1)compared to a significantly higher k of 0.563±0.028 Wm^(-1)K^(-1)for the adjacent normal tissues.A similar trend was observed inρB,ρS,and k for the deparaffinized tissue *** analysis of a combination ofρ_(B,)ρ_(S,)and k using Fisher’s combined probability test and linear regression suggests the advantage of using all three parameters simultaneously for distinguishing tumors from adjacent normal tissues with higher statistical significance.

关键词： biopsy breast resistivity

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NC code generation for laser assisted turn-mill of various type of clovers and square section members

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Journal of Central South University 2012年第11期19卷 3064-3068页

作者： CHOI Jun-young LEE Choon-man department of Mechanical design & manufacturing Engineering Changwon National UniversityChangwon 641-773Korea

Laser assisted turning （LAT） is one of the advanced machining technologies, which uses laser power to heat the surface of a workpiece before the material is removed. It has several advantages of low manufacturing costs, high productivity and high qualities to machine difficult-to-cut materials such as silicon nitride, muUite, zirconia and Ni. A large part of studies on LAT have been focused on a round bar. With increasing demands for high quality products and high performance engineering system, the researches on LAT for clover and square section members are necessary. But, these workpieces are impossible to be machined on conventional CNC lathe and to generate NC code with current CAM softwares. As a basic research for combining LAT with a tilting index table type 5-axis machining center, i.e. laser assisted turn-mill, a new method is suggested to generate NC code that can process various types of clover and square section members through development of C＋＋ program.

关键词： laser assisted turning (LAT) NC code clover section turn-mill square section turn-mill

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Contact surface fatigue life for roller rack pinion system

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Journal of Central South University 2012年第12期19卷 3454-3459页

作者： KIM Chang-hyun CHOI Heung-soap KWON Soon-man department of Mechanical design and manufacturing Engineering Changwon National UniversityChangwon 641-773Korea department of Mechano-Informatics and design Engineering Hongik UniversitySejong 339-701Korea

A roller rack pinion(RRP)system,which consists of a rack-bar and a cam pinion,transforms a rotation motion into linear *** rack-bar has a series of roller train and meshes with the cam ***,the exact tooth profile of the cam pinion and the non-undercut condition to satisfy the required performance have been proposed with the introduction of the profile shift ***,the load stress factors are investigated under the variation of the shape design parameters to predict the gear surface fatigue limit which is strongly related to the gear noise and vibration at the contact *** results show that the pitting life can be extended significantly with the increase of the profile shift coefficient.

关键词： roller rack pinion profile shift coefficient load stress factor pitting life

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