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Tetsugi Ueoka - One of the best experts on this subject based on the ideXlab platform.

  • Welding characteristics of ultrasonic plastic welding using two-Vibration-System of 90 kHz and 27 or 20 kHz and complex Vibration Systems
    Ultrasonics, 1998
    Co-Authors: Jiromaru Tsujino, Katsuhisa Yamano, Noriyuki Iwamoto, Takako Uchida, Tetsugi Ueoka
    Abstract:

    To improve welding characteristics of ultrasonic plastic welding, a 90 kHz two-Vibration-System, which can weld plastic sheets under one-third velocity amplitude compared with that of 27 kHz Systems, is effective. However, this System cannot weld large specimens successfully because high frequency Vibration stress cannot be transmitted uniformly through the large specimens due to the stress relaxation effect by the small Vibration displacement of the high frequency welding tip. The ultrasonic welding Systems using the combinations of (1) a high frequency 90 kHz longitudinal Vibration System with small displacement amplitude and a low frequency 27 kHz longitudinal Vibration System with large displacement amplitude (not velocity amplitude), (2) a 90 kHz longitudinal System and a 20 kHz torsional Vibration System with large displacement, and (3) the complex Vibration welding System using 27 kHz complex Vibration welding tips vibrating in elliptical to circular locus are studied. The welding specimens used are soft (polyvinyl chloride: shear Vibration loss is large) and hard (polypropylene) sheet materials, and both specimens were welded successfully with smaller velocity amplitude than that of the conventional welding method, similarly in both cases where (1) parallel and (2) normal direction Vibration Systems are driven simultaneously. The complex Vibration welding Systems of 27 kHz which has elliptical and circular Vibration loci were revealed also effective for plastic welding.

  • characteristics of two Vibration System ultrasonic plastic welding with 90 khz and 20 khz Vibration Systems at right angles
    Japanese Journal of Applied Physics, 1996
    Co-Authors: Jiromaru Tsujino, Toshiki Tamura, Takako Uchida, Tetsugi Ueoka
    Abstract:

    The direct welding characteristics of an ultrasonic plastic welding System with an upper 90 kHz longitudinal welding tip with a small Vibration amplitude and a lower 20 kHz low frequency torsional Vibration welding tip with a large Vibration amplitude at right angles are studied. By using a combination of high and low Vibration frequency Systems with small and large Vibration amplitude welding tips, the welding characteristics are improved, resulting in a smaller required Vibration amplitude and less damage to the specimens due to Vibration than those using conventional Systems. The two-Vibration-System welding equipment consists of a 90 kHz upper longitudinal Vibration source with six bolt-clamped Langevin-type piezoelectric ceramic (lead-zircon-titanate; PZT) transducers 15 mm in diameter, a 20 kHz torsional Vibration System 40 mm in diameter and a welding frame. The total required velocity amplitude of the two-Vibration-System welding equipment is decreased and the welding characteristics are improved significantly compared to those of conventional one-Vibration-System for both soft and hard plastic sheet welding.

Jiromaru Tsujino - One of the best experts on this subject based on the ideXlab platform.

  • Welding characteristics of ultrasonic plastic welding using two-Vibration-System of 90 kHz and 27 or 20 kHz and complex Vibration Systems
    Ultrasonics, 1998
    Co-Authors: Jiromaru Tsujino, Katsuhisa Yamano, Noriyuki Iwamoto, Takako Uchida, Tetsugi Ueoka
    Abstract:

    To improve welding characteristics of ultrasonic plastic welding, a 90 kHz two-Vibration-System, which can weld plastic sheets under one-third velocity amplitude compared with that of 27 kHz Systems, is effective. However, this System cannot weld large specimens successfully because high frequency Vibration stress cannot be transmitted uniformly through the large specimens due to the stress relaxation effect by the small Vibration displacement of the high frequency welding tip. The ultrasonic welding Systems using the combinations of (1) a high frequency 90 kHz longitudinal Vibration System with small displacement amplitude and a low frequency 27 kHz longitudinal Vibration System with large displacement amplitude (not velocity amplitude), (2) a 90 kHz longitudinal System and a 20 kHz torsional Vibration System with large displacement, and (3) the complex Vibration welding System using 27 kHz complex Vibration welding tips vibrating in elliptical to circular locus are studied. The welding specimens used are soft (polyvinyl chloride: shear Vibration loss is large) and hard (polypropylene) sheet materials, and both specimens were welded successfully with smaller velocity amplitude than that of the conventional welding method, similarly in both cases where (1) parallel and (2) normal direction Vibration Systems are driven simultaneously. The complex Vibration welding Systems of 27 kHz which has elliptical and circular Vibration loci were revealed also effective for plastic welding.

  • characteristics of two Vibration System ultrasonic plastic welding with 90 khz and 20 khz Vibration Systems at right angles
    Japanese Journal of Applied Physics, 1996
    Co-Authors: Jiromaru Tsujino, Toshiki Tamura, Takako Uchida, Tetsugi Ueoka
    Abstract:

    The direct welding characteristics of an ultrasonic plastic welding System with an upper 90 kHz longitudinal welding tip with a small Vibration amplitude and a lower 20 kHz low frequency torsional Vibration welding tip with a large Vibration amplitude at right angles are studied. By using a combination of high and low Vibration frequency Systems with small and large Vibration amplitude welding tips, the welding characteristics are improved, resulting in a smaller required Vibration amplitude and less damage to the specimens due to Vibration than those using conventional Systems. The two-Vibration-System welding equipment consists of a 90 kHz upper longitudinal Vibration source with six bolt-clamped Langevin-type piezoelectric ceramic (lead-zircon-titanate; PZT) transducers 15 mm in diameter, a 20 kHz torsional Vibration System 40 mm in diameter and a welding frame. The total required velocity amplitude of the two-Vibration-System welding equipment is decreased and the welding characteristics are improved significantly compared to those of conventional one-Vibration-System for both soft and hard plastic sheet welding.

Takako Uchida - One of the best experts on this subject based on the ideXlab platform.

  • Welding characteristics of ultrasonic plastic welding using two-Vibration-System of 90 kHz and 27 or 20 kHz and complex Vibration Systems
    Ultrasonics, 1998
    Co-Authors: Jiromaru Tsujino, Katsuhisa Yamano, Noriyuki Iwamoto, Takako Uchida, Tetsugi Ueoka
    Abstract:

    To improve welding characteristics of ultrasonic plastic welding, a 90 kHz two-Vibration-System, which can weld plastic sheets under one-third velocity amplitude compared with that of 27 kHz Systems, is effective. However, this System cannot weld large specimens successfully because high frequency Vibration stress cannot be transmitted uniformly through the large specimens due to the stress relaxation effect by the small Vibration displacement of the high frequency welding tip. The ultrasonic welding Systems using the combinations of (1) a high frequency 90 kHz longitudinal Vibration System with small displacement amplitude and a low frequency 27 kHz longitudinal Vibration System with large displacement amplitude (not velocity amplitude), (2) a 90 kHz longitudinal System and a 20 kHz torsional Vibration System with large displacement, and (3) the complex Vibration welding System using 27 kHz complex Vibration welding tips vibrating in elliptical to circular locus are studied. The welding specimens used are soft (polyvinyl chloride: shear Vibration loss is large) and hard (polypropylene) sheet materials, and both specimens were welded successfully with smaller velocity amplitude than that of the conventional welding method, similarly in both cases where (1) parallel and (2) normal direction Vibration Systems are driven simultaneously. The complex Vibration welding Systems of 27 kHz which has elliptical and circular Vibration loci were revealed also effective for plastic welding.

  • characteristics of two Vibration System ultrasonic plastic welding with 90 khz and 20 khz Vibration Systems at right angles
    Japanese Journal of Applied Physics, 1996
    Co-Authors: Jiromaru Tsujino, Toshiki Tamura, Takako Uchida, Tetsugi Ueoka
    Abstract:

    The direct welding characteristics of an ultrasonic plastic welding System with an upper 90 kHz longitudinal welding tip with a small Vibration amplitude and a lower 20 kHz low frequency torsional Vibration welding tip with a large Vibration amplitude at right angles are studied. By using a combination of high and low Vibration frequency Systems with small and large Vibration amplitude welding tips, the welding characteristics are improved, resulting in a smaller required Vibration amplitude and less damage to the specimens due to Vibration than those using conventional Systems. The two-Vibration-System welding equipment consists of a 90 kHz upper longitudinal Vibration source with six bolt-clamped Langevin-type piezoelectric ceramic (lead-zircon-titanate; PZT) transducers 15 mm in diameter, a 20 kHz torsional Vibration System 40 mm in diameter and a welding frame. The total required velocity amplitude of the two-Vibration-System welding equipment is decreased and the welding characteristics are improved significantly compared to those of conventional one-Vibration-System for both soft and hard plastic sheet welding.

Hajime Takada - One of the best experts on this subject based on the ideXlab platform.

  • Evaluation of Energy Absorption in Nonlinear Vibration System With Gaps
    Volume 8: Seismic Engineering, 2005
    Co-Authors: Masanori Shintani, Hiroyuki Ikuta, Hajime Takada
    Abstract:

    This paper deals with nonlinear Vibration characteristics of a continuum System with collision phenomena under random waves with gaps. In order to investigate such a nonlinear Vibration characteristic, an experimental apparatus consisting of a nonlinear Vibration System was made. Moreover, we propose an analytical model based on the restoring force characteristics of the experiments. In this report, the size of the gap between a mass and a plate is set to 0.5mm or 1.0mm. For this experimental model we also propose an analytical model. We use plates of 1.6mm thickness in the collisions both in the experiment and the analysis. The analytical model is based on an elasto-plasticity solid model. When considering the coefficients of restitution or energy absorption, the experimental results nearly agree with the analytical results [10]. We found that the rate of a collision changes with the size of the gap at each input acceleration level. As the gap size widens, energy absorption decreases for each input acceleration level. Consequently, in order to increase the energy absorption, it becomes necessary to increase the rate of the collision.Copyright © 2005 by ASME

  • study on nonlinear Vibration characteristic evaluation of nonlinear Vibration System with gaps by transition probability density function
    ASME JSME 2004 Pressure Vessels and Piping Conference, 2004
    Co-Authors: Masanori Shintani, Hiroyuki Ikuta, Hajime Takada
    Abstract:

    In this paper, the transition probability density functions between response velocity and response displacement in nonlinear Vibration Systems which have the restoring force characteristic of a cubic equation are governed by the Fokker-Planck Equation. The experimental probability density functions are compared with analytical results. The analytical model of the cubic equation as Duffing Equation is proposed by the restoring force characteristic of the nonlinear Vibration System with gaps in the experiments. However, a slight difference for the frequency range of the transfer function was shown by simulation results. Then, it is considered using transition probability density functions in the response characteristic. For stationary random input waves, the probability density function between the response displacement and the response velocity are easily estimated by the Fokker-Planck Equation and the Duffing Equation. The slight difference of the transfer function of the response acceleration is evaluated by the scattering of the restoring force characteristic estimated by the probability density function and self-natural frequency curve. The R.M.S. value and the transfer function of the experimental results are compared with the analytical results. It is thought that the estimation of the probability density function of the response has validity. It is thought that the evaluation of the nonlinear Vibration characteristics by the probability density function is valid.Copyright © 2004 by ASME

  • Study on Nonlinear Vibration Characteristic Evaluation of Nonlinear Vibration System With Gaps by Transition Probability Density Function
    Seismic Engineering Volume 2, 2004
    Co-Authors: Masanori Shintani, Hiroyuki Ikuta, Hajime Takada
    Abstract:

    In this paper, the transition probability density functions between response velocity and response displacement in nonlinear Vibration Systems which have the restoring force characteristic of a cubic equation are governed by the Fokker-Planck Equation. The experimental probability density functions are compared with analytical results. The analytical model of the cubic equation as Duffing Equation is proposed by the restoring force characteristic of the nonlinear Vibration System with gaps in the experiments. However, a slight difference for the frequency range of the transfer function was shown by simulation results. Then, it is considered using transition probability density functions in the response characteristic. For stationary random input waves, the probability density function between the response displacement and the response velocity are easily estimated by the Fokker-Planck Equation and the Duffing Equation. The slight difference of the transfer function of the response acceleration is evaluated by the scattering of the restoring force characteristic estimated by the probability density function and self-natural frequency curve. The R.M.S. value and the transfer function of the experimental results are compared with the analytical results. It is thought that the estimation of the probability density function of the response has validity. It is thought that the evaluation of the nonlinear Vibration characteristics by the probability density function is valid.

Wen Bang-chun - One of the best experts on this subject based on the ideXlab platform.

  • Control study and simulation analysis of Vibration System driven by two motors
    Computer Engineering and Applications, 2010
    Co-Authors: Wen Bang-chun
    Abstract:

    Synchronization problem is the key of System driven by two or more motors.The dynamic model of Vibration System driven by two motors and the mathematics model of induction motor are established.The dynamic characteristic of Vibration System is analyzed by using dynamic theory,and the conditions of realizing frequency capture and the scheme to control phase difference of the two eccentric rotors are obtained.The computer simulation program in self-synchronous condition and that based on phase difference control of realizing frequency capture’s conditions are run,and results of computer simulations show that the Vibration System can realize speed synchronization and phase synchronization rapidly after has been controlled.The simulation results verify the effectiveness of the control scheme.

  • Optimal Design of Vibration System Driven by Dual-motor Based on Phase Difference Control
    Machine Tool & Hydraulics, 2009
    Co-Authors: Wen Bang-chun
    Abstract:

    The dynamic model of Vibration System driven by dual-motor in reverse direction was established.Through dynamic analysis of the Vibration System,the simulation based on the dynamic model of Vibration System and the mathematics model of induction motor was made.Simulation results show that the System is in a poor synchronous state.The method to control phase difference of the two eccentric rotors was analyzed,and the Vibration System was optimized.Computer simulation demonstrates that the Vibration System realizes speed synchronization and phase synchronization.The results verify the effectiveness of the optimal design.

  • Frequency-based capture control on revertible dual-motor-driven Vibration System
    Chinese journal of construction machinery, 2008
    Co-Authors: Wen Bang-chun
    Abstract:

    In this study,the dynamical model of revertible dual-motor-driven Vibration System,together with the mathematical model of inductive motor,is established. The dynamical properties of Vibration System are first analyzed using dynamical theories. Then,the frequency-capturing conditions are obtained. Based on these conditions,the control strategy is developed for phase difference of two eccentric rotors. Next,the simulation programming is conducted on self-synchronous condition and phase difference control. Finally,the simulation results reveal that the Vibration System can be controlled for rapid speed and phase synchronizations.Therefore,the effectiveness of control strategy is verified.

  • Analysis of Definite Solution to Wave Equation of Ultrasonic Machining Vibration System
    Journal of Northeastern University, 2008
    Co-Authors: Wen Bang-chun
    Abstract:

    A universal defining equation of ultrasonic Vibration System is derived,with its definite solution ascertained involving both linear and nonlinear boundary conditions.Then,based on the wave theory,universal defining equation of composite radius-changing horn is given in exponential form,and the linear boundary condition is set to solve the sectionalized nonlinear equation to derive the general expressions of wave node position and amplification coefficient relevant to the horn.Furthermore,the nonlinear boundary condition is set to provide the definite solution to the nonlinear dynamic model of the System.The numerical results reveal that the definite solution gives a correct expression to the dynamic characteristic of ultrasonic Vibration System and wave motion of the horn,thus providing theoretically a reference for other ultrasonic Vibration System.