Jsme International Journal Series C-mechanical Systems Machine Elements and Manufacturing最新文献

{"title":"The Study of Dynamic Balancing for High-Speed Presses","authors":"Cheng-Ho Li, P. Tso","doi":"10.1299/JSMEC.49.657","DOIUrl":"https://doi.org/10.1299/JSMEC.49.657","url":null,"abstract":"The dynarnic problem of rnechanical presses is becoming a considerable issue while the press operating speed is increasing nowadays. For maintaining the reliable perferrnance and high productivity of high-speed press, the dynamic effects must be seriously coped with by an applicable dynamic balancing strategy, In this paper, a new dyriarnic balancing approach for high-speed presses is presented. Ihe approach is composed of an adjustable reeiprocating 1inkage balancer and proper counterweight disks disnibution, A notion of iterative procedure is adopted for obtaining the utmost superior balancing effect. The adaptive balancing within different operating speeds is taken into account, and the balancing performance is discussed, A practical clesign example en a drag-link press is presented for illustration. [[he conclusion showed that the shaking force/mement could be effbctively lessened by the proposed balancing method. design, A notion of iterative procedure, alternately adjusting the linkage balancer and modifying the counterweight distribution, is adopted for obtaining the utmost superioT balancing effect. Furtherrnore, to deal with consideral)le dyriamic forces of high-speed presses, adaptive balancing within different operating speeds is taken into account, and the balance perfbrrnance is discussed, A design example on Stephenson III six-bar mechanical press is preserited for illustration, BASIC ARRANGEMENT Fig, 1 shows a Stephenson III sjx-bar press mechanisrn (including links AB, BC, CD, CE and EF) and a linkage balancer (including links AB' and B'C'). The link r2 of the press mechanism and the link r2' of the balancer mechanism are both driven by an identical input with constant angu1ar velocity. Ihus, two reciprocating motions of the sliders would go in opposite directionssimultaneously. INTRODUCTION The pTess operating speed is increasing for providing more eencient production capability. At high operating speeds, ranged ever 500 2000 SPM (stroke per minutes), mechanical presses exhibit dynarnic effects which may induce vibration and noise. For rnaintaining the relial)le performance and high productivity of high-speed press, the dynamic effects must be seriously coped with, i.e., an app]icahle dynamic balancing strategy is necessary. flie unbalancing of press mechanisms is categorized in reciprocating-type unbalancing since the ram keeps periodically upward/downward motion. A conyentional strategy for press balancing is applying a linkage balancer mechanism, Such linkage balancer is often a four-bar slider driven by a crank or a rocker, The reciprocating motion of the linkage balancer simply provides shaking forces opposite to the dynarnic unbalance of the press rnechanism. Based on our previous study [1], a well-designed slider crank balancer could effectively lessen the eritical shaking forces down to 5%. On the other hand, Chiou [2] proposed an optimum balancing desigri of mechanical presses for precisien cutting by adding counterweigh","PeriodicalId":151961,"journal":{"name":"Jsme International Journal Series C-mechanical Systems Machine Elements and Manufacturing","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122441131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Removal of Pipe Fouling Inside Pipes Using Ultrasonic Waves","authors":"N. Nakagawa, M. Fujihara, Chaoqun Wu, J. Satonobu","doi":"10.1299/JSMEC.49.713","DOIUrl":"https://doi.org/10.1299/JSMEC.49.713","url":null,"abstract":"Since fouling generated inside pipes of chemistry plant equipment, shortens “its life”, periodical maintenance such as cleaning or replacement is needed. Therefore, the development of a safe and sanitary method of preventing a corrosion and blockage inside pipes is desired. In this study, a vibration system, composed of a bolt-clamped Langevin transducer and a pipe, was employed to experimentally study the possibility of fouling removal. In the experiment, a flexural vibration was excited in a pipe containing fouling using ultrasonic waves. When the pipe was made to vibrate, with calcium carbonate or starch used as the fouling, it was shown that the fouling was di ff used into the air, and except at the node of the flexural vibration, the fouling was removed completely. Also, the result showed that a higher input voltage to the transducer was more e ff ective in removing the fouling.","PeriodicalId":151961,"journal":{"name":"Jsme International Journal Series C-mechanical Systems Machine Elements and Manufacturing","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124776439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling on a Gimbal with an Antenna and Investigation on the Influence of Backlash","authors":"Joo-hyun Baek","doi":"10.1299/JSMEC.49.804","DOIUrl":"https://doi.org/10.1299/JSMEC.49.804","url":null,"abstract":"A model of an azimuth driving servo system with a flexible antenna in a tracking system was derived in this work. The validity of the model was verified by comparing the results of the model with experimental results. When modeling the dynamics of a gimbal with an antenna, the antenna should be considered as a flexible body. The e ff ect of reducing the magnitude of the backlash that results in extending the bandwidth in a system with a flexible antenna is smaller than the e ff ect of reducing the magnitude of the backlash in a system with a sti ff antenna. When there is a need to reduce the weight and extend the bandwidth, the derived model enables the design of a tracking system to be optimized.","PeriodicalId":151961,"journal":{"name":"Jsme International Journal Series C-mechanical Systems Machine Elements and Manufacturing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124028857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Feedback Control of an Active Sound Insulation Unit","authors":"Naoki Kanamori, M. Nishimura, Takumi Mishiro","doi":"10.1299/JSMEC.49.663","DOIUrl":"https://doi.org/10.1299/JSMEC.49.663","url":null,"abstract":"This paper describes designs of structures and control systems of an active sound insulation unit consisting of active cells which are individually controlled as a single input single output system. Two types of Active Sound Insulation Cell (ASIC) using lightweight card-type speakers were manufactured for trial. It became clear that ASIC can reduce the transmitted noise whose sound field inside the cell is uniform. That means that the size of ASIC should be less than quarter wavelength of controlled sound and secondary noise sources should be properly arranged. The feedback control system for ANC was systematically designed by H-infinity control theory, and the sound attenuating performance was verified by the simulation.","PeriodicalId":151961,"journal":{"name":"Jsme International Journal Series C-mechanical Systems Machine Elements and Manufacturing","volume":"163 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132493270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fault Diagnosis System of Induction Motors Using Feature Extraction, Feature Selection and Classification Algorithm","authors":"Bo-Suk Yang, Tian Han, Z. Yin","doi":"10.1299/JSMEC.49.734","DOIUrl":"https://doi.org/10.1299/JSMEC.49.734","url":null,"abstract":"This paper proposes a fault diagnosis system for induction motor which integrates principal component analysis (PCA), genetic algorithm (GA) and artificial neural network (ANN). Vibration signals and stator current signals are measured as the fault diagnosis media. Many sensors result in many features to ANN. In order to avoid the curse of dimensionality phenomenon and improve the classification rate, PCA and GA are employed to reduce the feature dimensionality of the measured data. PCA removes the relative features. Then the irrelative features after PCA are selected by GA to find better feature subset as inputs to the network under a few population and generations. GA is also used to optimize the ANN structure in that the selected PCs feature subset is evaluated by it. The efficiency of the proposed system is validated by comparison of other three systems: ANN only, ANN with PCA and ANN with GA. The classification success rate for the ANN with PCA and GA was 100% for validation, while the rates of ANN only, ANN with PCA and ANN with GA were 83.33%, 86.67% and 98.89%, respectively.","PeriodicalId":151961,"journal":{"name":"Jsme International Journal Series C-mechanical Systems Machine Elements and Manufacturing","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130271173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Differentiation and Monitoring of Cells Using a Biochip for Regenerative Medicine","authors":"T. Uchida, F. Arai, O. Suzuki, A. Ichikawa, T. Fukuda, T. Katagiri, R. Kamijo, Masanori Nakamura, M. Numata, N. Watanabe","doi":"10.1299/JSMEC.49.852","DOIUrl":"https://doi.org/10.1299/JSMEC.49.852","url":null,"abstract":"A novel biochip is developed for culturing stem cells. Biochip is made of Polymer (PDMS), and cells can be loaded by gradient strains in one chip. They grow well on a hydrophilic membrane and differentiation is promoted by cyclic strains. In this paper, we propose the method for culturing and monitoring of stem cells such as bone marrow stromal cells (ST2 cells) and myoblasts (C2C12 cells), and the results of culture. First we analyzed strains on a membrane when an air hole is decompressed, and clarified their range. From experiment, bone marrow stromal cells grew well in a narrow range, and we quantified their ALP activity as a measure of differentiation. As myoblasts, the direction of their differentiation was perpendicular to a groove, that is, the same direction of uniaxial strains.","PeriodicalId":151961,"journal":{"name":"Jsme International Journal Series C-mechanical Systems Machine Elements and Manufacturing","volume":"308 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114103952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic Characteristics of Exhaust Hanger Composed of Rubber and Thin Metal Ring","authors":"Kazunari Nakahara, N. Nakagawa, K. Ohta, T. Miyake, Ramanjaneyulu Kakarla","doi":"10.1299/JSMEC.49.750","DOIUrl":"https://doi.org/10.1299/JSMEC.49.750","url":null,"abstract":"The dynamic characteristics of exhaust hangers for automotive use are studied for high frequencies at which the resonance vibration of the exhaust hangers occurs. A newly developed exhaust hanger composed of rubber and a thin metal ring is presented, which can provide a lower dynamic stiffness in a wide frequency range than an exhaust hanger made of solid rubber. A dynamic characterization testing and finite-element analysis of the exhaust hangers were carried out to clarify the frequency responses of dynamic stiffness in the high-frequency range. A method of treating the viscoelasticity of the rubber material using the finite-element method is proposed to predict the dynamic characteristics of the exhaust hangers. The finite-element method results show a good agreement with the experimental results for the frequency response of dynamic stiffness. Concerning the newly developed exhaust hanger, the effects of metal ring geometry and rubber hardness on the dynamic stiffness are examined to demonstrate the design principle for providing a low dynamic stiffness in a wide frequency range.","PeriodicalId":151961,"journal":{"name":"Jsme International Journal Series C-mechanical Systems Machine Elements and Manufacturing","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121244930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Configurations of Large Capacity Ultrasonic Complex Vibration Sources with Complex Transverse Vibration Rods and a Disk with Multiple Transducers","authors":"J. Tsujino, T. Ueoka, Y. Kikuchi","doi":"10.1299/JSMEC.49.695","DOIUrl":"https://doi.org/10.1299/JSMEC.49.695","url":null,"abstract":"The ultrasonic complex vibration systems with elliptical to circular locus are e ff ective and essential for new high power applications in various industries. Configuration of a 27 kHz and a 40 kHz complex vibration source with a complex transverse vibration rod with a welding tip part and a longitudinal and transverse vibration disk with six and four bolt-clamped Langevin type PZT longitudinal transducers and welding characteristics of aluminum and aluminum alloy plates using complex vibration systems were studied. Outer diameters of the 40 kHz complex vibration sources are 191 to 195 mm which are about half of the diameter 395 mm of the 27 kHz vibration source. Stepped complex transverse-vibration rods with a welding tip is installed in the center of the disk and is driven in circular vibration locus at the free edge of the rod (welding tip) using three and two 500 W power amplifier systems.","PeriodicalId":151961,"journal":{"name":"Jsme International Journal Series C-mechanical Systems Machine Elements and Manufacturing","volume":"286 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121829585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Dynamic Equation and Simulation of a Linkage Mechanism Fabricated from Three-Dimensional Braided Composite Materials","authors":"G. Cai, Wang Rugui, Zhao-jun Li","doi":"10.1299/JSMEC.49.727","DOIUrl":"https://doi.org/10.1299/JSMEC.49.727","url":null,"abstract":"The work in this paper is concerned with a four-bar linkage mechanism with links fabricated from three-dimensional braided composite materials. The dynamic equation of the mechanism is established by finite element method (FEM), it includes composite materials parameters and structural parameters of the mechanism. The mass matrix of the beam element is obtained in light of the mass distribution characteristics of the composite materials. According to the 3-dimensional microstructure characters of the three-dimensional braided composite materials, the anisotropic beam element is considered to be made up of four parts, and then the stiffness matrix of the beam element is derived from the constitutive equations of each part and the relation between the strain distribution of each part and the node displacement of the beam element. Based on the damping element model and the expression of dissipation energy of the 3-dimentional braided composite materials, each modal damping value of the mechanism is calculated and the damping matrix of the mechanism is established. The dynamic responses and natural frequency of the mechanism are obtained by simulation, respectively. The work presented in the paper provides theoretical basis to a certain extent for the further research on nonlinear vibration characteristics and optimum design of this kind of mechanism.","PeriodicalId":151961,"journal":{"name":"Jsme International Journal Series C-mechanical Systems Machine Elements and Manufacturing","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124887409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of the Aero-Acoustic and Aerodynamic Effects of Soft Coating upon Airfoil","authors":"J. Vad, G. Koscsó, Miklos Gutermuth, Z. Kasza, T. Tábi, T. Csörgő","doi":"10.1299/JSMEC.49.648","DOIUrl":"https://doi.org/10.1299/JSMEC.49.648","url":null,"abstract":"Comparative acoustic and wind tunnel experiments were carried out on uncoated and coated isolated airfoils. The aim of the tests was to survey the airfoil noise reducing effect and the aerodynamic impact of the acoustically soft coating consisting of filaments, as a preliminary study in application of such coatings to axial flow turbomachinery bladings. It was found in the acoustic tests that the coating successfully reduces the sound pressure in the frequency range critical from the aspect of human audition. The wind tunnel experiments included laser Doppler anemometer studies on the development of the boundary layers and on the wake structure, and static pressure measurements on the blade surface and in the wake. The coating reduced the lift and increased the drag. A proposal has been made for further studies in order to retain the advantageous acoustic effects of the coating while avoiding the undesirable aerodynamic impact.","PeriodicalId":151961,"journal":{"name":"Jsme International Journal Series C-mechanical Systems Machine Elements and Manufacturing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129796406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}