Pub Date : 1992-06-01DOI: 10.1299/JSMEC1988.35.279
Yoshitsugu Yasui
{"title":"Decomposition Method for Mode Shape Identification Using Measured Data.","authors":"Yoshitsugu Yasui","doi":"10.1299/JSMEC1988.35.279","DOIUrl":"https://doi.org/10.1299/JSMEC1988.35.279","url":null,"abstract":"","PeriodicalId":356058,"journal":{"name":"JSME international journal. Series 3, Vibration, control engineering, engineering for industry","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125534129","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}
Pub Date : 1992-03-15DOI: 10.1299/JSMEC1988.35.109
Y. Oshinoya, T. Shimogo
{"title":"Electromagnetic Levitation Control of a Traveling Steel Belt","authors":"Y. Oshinoya, T. Shimogo","doi":"10.1299/JSMEC1988.35.109","DOIUrl":"https://doi.org/10.1299/JSMEC1988.35.109","url":null,"abstract":"","PeriodicalId":356058,"journal":{"name":"JSME international journal. Series 3, Vibration, control engineering, engineering for industry","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121065585","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":"Multivariable root loci of control systems of robot manipulators with flexible driving systems (distortion feedback)","authors":"J. Furusho, H. Nagao, M. Naruse","doi":"10.1299/JSMEC1988.35.65","DOIUrl":"https://doi.org/10.1299/JSMEC1988.35.65","url":null,"abstract":"","PeriodicalId":356058,"journal":{"name":"JSME international journal. Series 3, Vibration, control engineering, engineering for industry","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133180674","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}
The authors apply the transfer influence coefticient method to a two-dimensional tree structure, and formulate a general algorithm to analyse in-plane longitudinal and flexural coupled free vibration. The tree structure, which is mainly found in the F-shaped structure of machine tools, pipeline systems and so on, has some crooked parts and subsystems but has no closed loop in the system. It is modeled as a distributed mass system in the present algorithm. It is theoretically confirmed that some merits of the transfer influence coefficient method also hold for the two-dimensional tree structure; that is, boundary conditions are easily controlled by the spring constants, and false roots in the use of the bisection method as a solution to the frequency equation can readily be eliminated by using the values obtained in the computational process. The occurrence mechanism of false roots is discussed in detail.
{"title":"Free Vibration Analysis of a Tree Structure by the Transfer Influence Coefficient Method : 1st Report, Formulation for a Two-dimensional Tree Structure","authors":"T. Kondou, A. Sueoka, Y. Yasuda, D. Moon","doi":"10.1299/JSMEC1988.35.22","DOIUrl":"https://doi.org/10.1299/JSMEC1988.35.22","url":null,"abstract":"The authors apply the transfer influence coefticient method to a two-dimensional tree structure, and formulate a general algorithm to analyse in-plane longitudinal and flexural coupled free vibration. The tree structure, which is mainly found in the F-shaped structure of machine tools, pipeline systems and so on, has some crooked parts and subsystems but has no closed loop in the system. It is modeled as a distributed mass system in the present algorithm. It is theoretically confirmed that some merits of the transfer influence coefficient method also hold for the two-dimensional tree structure; that is, boundary conditions are easily controlled by the spring constants, and false roots in the use of the bisection method as a solution to the frequency equation can readily be eliminated by using the values obtained in the computational process. The occurrence mechanism of false roots is discussed in detail.","PeriodicalId":356058,"journal":{"name":"JSME international journal. Series 3, Vibration, control engineering, engineering for industry","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122683058","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}
Although there is a large demand for wire-mobile robots, it is very difficult to design a mobile robot that both avoids obstacles and transfers to a branch wire. This paper describes methods of obstacle avoidance and transferral to branch wires for a wire-mobile robot with a multiunit structure. Basic analysis, synthesis, and experimental results clarify the kinematics of and control method for this mobile robot. We also demonstrate an ultrasonic sensing system for environmental recognition, which is necessary for autonomous robot motion. The multiunit structure avoids obstacles, but it uses many actuators. We therefore propose a compact wire-mobile robot with a balancer that transfers the center of gravity.
{"title":"A Multiunit Wire-Mobile Robot that Avoids Obstacles and Transfers to Branch Wires.","authors":"S. Aoshima, T. Tsujimura, T. Yabuta","doi":"10.1299/JSMEC1988.35.74","DOIUrl":"https://doi.org/10.1299/JSMEC1988.35.74","url":null,"abstract":"Although there is a large demand for wire-mobile robots, it is very difficult to design a mobile robot that both avoids obstacles and transfers to a branch wire. This paper describes methods of obstacle avoidance and transferral to branch wires for a wire-mobile robot with a multiunit structure. Basic analysis, synthesis, and experimental results clarify the kinematics of and control method for this mobile robot. We also demonstrate an ultrasonic sensing system for environmental recognition, which is necessary for autonomous robot motion. The multiunit structure avoids obstacles, but it uses many actuators. We therefore propose a compact wire-mobile robot with a balancer that transfers the center of gravity.","PeriodicalId":356058,"journal":{"name":"JSME international journal. Series 3, Vibration, control engineering, engineering for industry","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121256609","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}
A new method of measuring displacement by means of variations of sound frequency and length of an air column in a stopped resonant pipe has been investigated. In this study, a speaker was used as the sound-generating source instead of the air jet, which was used for the feedback excitation mechanism on the edge instrument. This paper deals with a new kind of displacement sensor using an electric feedback circuit. A sweep signal is radiated from the speaker through the small hole which is opened on one end of the closed resonant pipe, toward the inside of the air column. The sound pressure takes the largest value at the resonant frequency. The displacement of the plunger which is inserted from the other end of the pipe corresponds to the length of the air column. Thus; the displacement of the plunger corresponds well to the resonant frequency of the air column. The phase-locked loop device is adopted for stability of the resonance and frequency
{"title":"A new method of measuring displacement by means of variations of sound frequency and the length of air column in a small pipe (a resonant method using speaker and electric feedback loop)","authors":"S. Sakamoto, R. Ichimiya, Yuji Suzuki","doi":"10.1299/JSMEC1988.35.9","DOIUrl":"https://doi.org/10.1299/JSMEC1988.35.9","url":null,"abstract":"A new method of measuring displacement by means of variations of sound frequency and length of an air column in a stopped resonant pipe has been investigated. In this study, a speaker was used as the sound-generating source instead of the air jet, which was used for the feedback excitation mechanism on the edge instrument. This paper deals with a new kind of displacement sensor using an electric feedback circuit. A sweep signal is radiated from the speaker through the small hole which is opened on one end of the closed resonant pipe, toward the inside of the air column. The sound pressure takes the largest value at the resonant frequency. The displacement of the plunger which is inserted from the other end of the pipe corresponds to the length of the air column. Thus; the displacement of the plunger corresponds well to the resonant frequency of the air column. The phase-locked loop device is adopted for stability of the resonance and frequency","PeriodicalId":356058,"journal":{"name":"JSME international journal. Series 3, Vibration, control engineering, engineering for industry","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127407163","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":"Leakage-Flow-Induced Vibrations of an Axisymmetric Body : Analysis of the Fluid Dynamic Forces Exerted on an Axisymmetric Body","authors":"Masaaki Arai, K. Tajima","doi":"10.1299/JSMEC1988.35.56","DOIUrl":"https://doi.org/10.1299/JSMEC1988.35.56","url":null,"abstract":"","PeriodicalId":356058,"journal":{"name":"JSME international journal. Series 3, Vibration, control engineering, engineering for industry","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129349265","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}
Submerged long-span gates which dam wide rivers can undergo violent streamwise vibrations caused by vortex shedding beneath the gate. This study presents flow-induced vibration characteristics which were obtained in a model gate test. From the measured vibration frequencies and damping ratios in air and water, the level of fluid excitation and the added mass for small-amplitude gate vibrations are calculated and reduced to a dimensionless form. Thus, the vibration criteria are obtained. In addition, the average values of the maximum amplitudes of gate vibration were measured. The results of these experiments, taken as a whole, suggest that the flow-induced vibration characteristics of the long-span gates are well predicted by dimensionless parameters, such as the reduced gate opening and the reduced velocity.
{"title":"Flow-Induced Vibration of Long-Span Gates due to Shed Vortices (Vibration Criteria, Level of Fluid Excitation and Added Mass).","authors":"N. Ishii, C. Knisely","doi":"10.1299/JSMEC1988.35.1","DOIUrl":"https://doi.org/10.1299/JSMEC1988.35.1","url":null,"abstract":"Submerged long-span gates which dam wide rivers can undergo violent streamwise vibrations caused by vortex shedding beneath the gate. This study presents flow-induced vibration characteristics which were obtained in a model gate test. From the measured vibration frequencies and damping ratios in air and water, the level of fluid excitation and the added mass for small-amplitude gate vibrations are calculated and reduced to a dimensionless form. Thus, the vibration criteria are obtained. In addition, the average values of the maximum amplitudes of gate vibration were measured. The results of these experiments, taken as a whole, suggest that the flow-induced vibration characteristics of the long-span gates are well predicted by dimensionless parameters, such as the reduced gate opening and the reduced velocity.","PeriodicalId":356058,"journal":{"name":"JSME international journal. Series 3, Vibration, control engineering, engineering for industry","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128723106","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}
An algorithm for a two-dimensional tree structure formulated in the previous report by applying the transfer influence coefficient method is extended in order to analyse the longitudinal, flexural and torsional coupled free vibration of a three-dimensional tree structure. Moreover, adequate selection of a nonzero state variable as an initial standard value in the computation of characteristic modes and the problem of false roots which occur in the analysis for a structure with subsystems by applying the transfer matrix method are also discussed. The superiority of the present method over the transfer matrix method in the computational accuracy and the computation speed is confirmed by the numerical computation for typical models of both two-and three-dimensional tree structures.
{"title":"Free Vibration Analysis of a Tree Structure by the Transfer Influence Coefficient Method : 2nd Report, Treatment of a Three-Dimensional Tree Structure and Numerical Computational Results","authors":"T. Kondou, A. Sueoka, Y. Yasuda, D. Moon","doi":"10.1299/JSMEC1988.35.32","DOIUrl":"https://doi.org/10.1299/JSMEC1988.35.32","url":null,"abstract":"An algorithm for a two-dimensional tree structure formulated in the previous report by applying the transfer influence coefficient method is extended in order to analyse the longitudinal, flexural and torsional coupled free vibration of a three-dimensional tree structure. Moreover, adequate selection of a nonzero state variable as an initial standard value in the computation of characteristic modes and the problem of false roots which occur in the analysis for a structure with subsystems by applying the transfer matrix method are also discussed. The superiority of the present method over the transfer matrix method in the computational accuracy and the computation speed is confirmed by the numerical computation for typical models of both two-and three-dimensional tree structures.","PeriodicalId":356058,"journal":{"name":"JSME international journal. Series 3, Vibration, control engineering, engineering for industry","volume":"04 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114574514","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}
Damping mechanisms based on gyroscopic moments are studied and their characteristics are compared with conventional mechanisms. A generalized form of Schlick's gyroscope is theoretically analyzed, and an optimal design method is derived. The stabilizing effect is compared with the rotational dynamic vibration absorber. It turns out that the effect of the passive gyroscopic stabilizer depends on the rotating speed of the gyroscope; thus the stabilizer has no essential limitation by the inertial moment such as there is with the rotational dynamic vibration absorber. The gimbal movement of the CMG (control moment gyroscope) is directly controlled with an actuator, thus it can be used as a fully active vibration control mechanism. The single-gimbal CMG is compared with the RW (reaction wheel) with respect to the damping efficiency for impulsive disturbances. Experiments with a single-gimbal CMG for a Pendulum are carried out and the results prove the efficiency.
{"title":"Vibration Damping Mechanisms with Gyroscopic Moment","authors":"O. Nishihara, H. Matsuhisa, Susumu Satō","doi":"10.1299/JSMEC1988.35.50","DOIUrl":"https://doi.org/10.1299/JSMEC1988.35.50","url":null,"abstract":"Damping mechanisms based on gyroscopic moments are studied and their characteristics are compared with conventional mechanisms. A generalized form of Schlick's gyroscope is theoretically analyzed, and an optimal design method is derived. The stabilizing effect is compared with the rotational dynamic vibration absorber. It turns out that the effect of the passive gyroscopic stabilizer depends on the rotating speed of the gyroscope; thus the stabilizer has no essential limitation by the inertial moment such as there is with the rotational dynamic vibration absorber. The gimbal movement of the CMG (control moment gyroscope) is directly controlled with an actuator, thus it can be used as a fully active vibration control mechanism. The single-gimbal CMG is compared with the RW (reaction wheel) with respect to the damping efficiency for impulsive disturbances. Experiments with a single-gimbal CMG for a Pendulum are carried out and the results prove the efficiency.","PeriodicalId":356058,"journal":{"name":"JSME international journal. Series 3, Vibration, control engineering, engineering for industry","volume":"156 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123485313","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}
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