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Journal of Mechanical and Electrical Intelligent System (JMEIS, J. Mech. Elect. Intel. Syst.) An international open-access peer-reviewed journal ISSN 2433-8273
Vol.4, No.3
TABLE OF CONTENTS
Articles
Expansion to parameter estimation problem of modified Kalman filter with stochastic dynamic analysis in prediction procedure Soichiro Takata, Susumu Tarao Journal of Mechanical and Electrical Intelligent System, Vol.4, No.3, pp.1-12, 2021. Abstract: The modified Kalman Filter incorporating Stochastic Dynamic Analysis in prediction step (KF-SDA) was already introduced in previous paper for systematically account for the nonlinear and parametric uncertainty excitation systems. In conventional study, the fundamental verifications were performed using single degree-of-freedom (DOF) system, two-DOF system, single-DOF system which is simultaneously subjected to stochastic parametric excitations and nonlinear single-DOF system, respectively. On the other hand, the actual field data analysis is often desired the methodology of the unknown parameter estimation using observable sensor data, for example, online anomaly detection, diagnosis, and so on. However, the conventional KF-SDA was not conducted the expansion to parameter estimation problem. This paper deals with the expansion method of KF-SDA to a parameter estimation problem. The parameter estimation problem based on KF-SDA will derived using the new state space representation. The fundamental operation verification is performed in the case of single-DOF system which is subjected to white noise excitation. Furthermore, application to the nonlinear system which is subjected to white noise excitation and the random parametric excitation system are considered.
Ripple Compensation for LLC Resonant Converter with Spectrum Spread EMI Reduction Shogo Katayama, Yasunori Kobori, Anna Kuwana, Haruo Kobayashi Journal of Mechanical and Electrical Intelligent System, Vol.4, No.3, pp.13-22, 2021. Abstract: This paper describes a voltage ripple reduction method for the LLC current resonance converter. Conventionally, inserting a filter for input / output and covering the entire converter circuit with a shield has been used as an electromagnetic interference (EMI) reduction method. However, this approach has problems of large size and high cost. Noise spectrum spread techniques are widely used as an EMI reduction method to alleviate these problems. We investigated the spectrum spread technique for the LLC resonant converter as an EMI reduction method. The output voltage of the LLC resonant converter is controlled by the switching frequency, and therefore, the spectrum spread technique causes increase of the output voltage ripple. In this study, we examine the suppression of the voltage ripple increase, and our simulation shows that our method reduces the output voltage ripple from 95 mV to 15 mV, while keeping the same or better EMI noise reduction.
Vibration analysis of in-plane bending mode in coupled cylindrical shell using coupled circular ring model for pipe thickness estimation Takumi Ito, Soichiro Takata Journal of Mechanical and Electrical Intelligent System, Vol.4, No.3, pp.23-33, 2021. Abstract: A pipe thickness estimation method using an in-plane bending mode frequency for the detection of the water main deterioration was already proposed in a previous paper. There is a problem that the conventional work was not considered the dependency of the number of connections. The actual distribution mains are consisted by the cylindrical shells of 3m ~ 5m length. However, the behavior of the in-plane bending mode frequency in the gradually increase the number of coupled cylindrical shells is not clear. Moreover, a simplified analysis model is required for conduct the pipe thickness estimation. In this paper, the vibration analysis of in-plane bending mode in coupled cylindrical shell was conducted using a coupled circular ring model for pipe thickness estimation. First, the formulation of analysis model was conducted based on the two-dimensional circular ring model. Furthermore, the vibration experiment was conducted using ideal coupled thin cylindrical shell pipes. In addition, the comparison between experiment result and theoretical result was performed. Finally, the estimation test of pipe thickness was conducted using the experiment results and theoretical model.
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