Updated on 2025/01/07

写真a

 
Naoto Nishiyama
 

Degree

  • Master(Engineering)   Coursework ( 2019.3   Fukui University of Technology )

Research Interests

  • Impact oscillation

  • Nonlinear vibration

Research Areas

  • Informatics / Mechanics and mechatronics

Education

  • Fukui University of Technology   Department of Mechanical Engineering   Graduated

    2013.4 - 2017.3

  • Fukui University of Technology   Department of Applied Science and Engineering   Master's Course   Completed

    2017.4 - 2019.3

  • Fukui University of Technology   Department of Applied Science and Engineering   Master's Course   Completed

    2019.4 - 2021.3

Research History

  • Fukui University of Technology   Lecturer

    2019.4

Professional Memberships

  • The Japan Society of Mechanicai Engineering

    2017.4

Qualification acquired

  • High School Teacher Specialization License

  • First Kind of High School Teacher License

 

Papers

  • Simple Suppression Method of Impact Oscillations Between a Pantograph and an Overhead Rigid Conductor Line Reviewed International journal

    Naoto Nishiyama, Kiyotaka Yamashita

    Perspectives in Dynamical Systems I — Applications   453   387 - 395   2024

    　More details

    Wave-like wear on the surface of a conductor line in a railway current
    collection system often makes a pantograph separate from the conductor line. In the
    present study, we propose a simple method to suppress the contact loss between a
    pantograph and a conductor line. The current collection system can be modeled as a
    one-degree-freedom spring mass system. A flexible beam is added to this system to
    produce higher natural frequencies. In experiments, we found that the contact loss
    is strongly suppressed in a certain range of excitation frequency.

  • Non-planar motions due to nonlinear interactions between unstable oscillatory modes in a cantilevered pipe conveying fluid Reviewed

    K. Yamashita, K. Kitaura, N. Nishiyama, H. Yabuno

    Mechanical Systems and Signal Processing   178 ( 109183 )   2022

    　More details

    Cantilevered pipes conveying fluid with an end mass exhibit rich post-critical nonlinear　behaviors and have attracted the interest of many researchers. In the present paper, we　focus on non-planar motions due to nonlinear interactions between two unstable oscillatory　modes. By applying the orthogonality condition between the　eigenfunction and its adjoint function to governing equations, evolution equations governing mixed-mode non-planar motions are analytically derived. In a certain range of flow velocity, mixed-mode non-planar motion can be produced. In this region, second- and third-mode oscillations are in distinct planes, which intersect perpendicularly. In particular, three-dimensional non-contacting measurements were conducted to verify the theoretical predictions, and hidden nonlinear modal interactions were extracted from experimental data. We observed mixed-mode non-planar motion that qualitatively agrees with the theoretical predictions. Moreover, in further experiments with a long pipe for future study, a sequence of bifurcating non-planar motions was observed.

  • Hopf-Hopf interactions in a spring-supported pipe conveying fluid Reviewed International journal

    K. Yamashita, N. Nishiyama, K. Katsura, H. Yabuno

    Mechanical Systems and Signal Processing   151　 ( 107390 )   2021

  • Suppression of impact oscillations in a railway current collection system with an additional ocsillatory system Reviewed

    N. Nishiyama, K. Yamashita

    Perspectives in Dynamical Systems III: Control and Stability   15 - 22   2021

  • Effect of the coupled oscillatory system on impact oscillations between a pantograph and a rigid conductor line Reviewed

    Transactions of the JSME(in japanese)   86 ( 881 )   2020.1

  • Experimental study on the impact oscillations between a two-degree-of-freedom system and a sinusoidally vibrating plate Reviewed

    ( 49 )   33 - 40   2019.12

  • Nonlinear stability of a spring-supported pipe conveying fluid Reviewed

    Kiyotaka Yamashita，Naoto Nishiyama，Kohsuke Katsura，Hiroshi Yabuno

    Applicable Solutions in Non-Linear Dynamical Systems   539 - 546   2019.12

▼display all

 

Teaching Experience

  • Science Literacy

    Institution：Fukui University of Technology

  • Introduction to PhysicsⅠ

    Institution：Fukui University of Technology

  • Experiment of Mechanical Engineering

    Institution：Fukui University of Technology

  • Career SeminarⅠ

    Institution：Fukui University of Technology

  • Career SeminarⅡ

    Institution：Fukui University of Technology

  • Creative ScienceⅠ

    Institution：Fukui University of Technology

  • Mechanical Experiment and Drawing

    Institution：Fukui University of Technology

  • Theme Study

    Institution：Fukui University of Technology

  • Career SeminarⅢ

    Institution：Fukui University of Technology

  • Career SeminarⅣ

    Institution：Fukui University of Technology

  • DynamicsⅠ

    Institution：Fukui University of Technology

  • Introduction to PhysicsⅡ

    Institution：Fukui University of Technology

  • Creative ScienceⅡ

    Institution：Fukui University of Technology

▼display all