Takumi Inoue | Last modified date：2020.01.30 |

Graduate School

Undergraduate School

全学教育（物理）

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##### http://dynamic.mech.kyushu-u.ac.jp/

Dynamics of Machinery

Department of Intelligent Machinery and Systems .

Fax

092-802-0001

Academic Degree

Dr. Engineering

Field of Specialization

Engineering dynamics, Mechanical vibration, Dynamics of machinery

Outline Activities

Study

Health monitoring of machines and structures by using the harmonic wavelet transform.

Devolopment of numerical methods for dynamic responses of large-size machine structures.

Devolopment of step by step numerical integration scheme for large-sized nonlinear systems.

Education

Taking charge of following classes

Elements of Mechanics and Exercises A

Elements of Mechanics and Exercises B

Engineerin Dynamics

Dynamics of Machinery

Exercise of Dynamics of Machinery

Mechanical Vibration

Exercise of Mechanical Vibration

Others

Tutelage for a Graduation Thesis

Social activities

Manegement of reserch group in the JSME.

Chairman in an academic meeting.

Health monitoring of machines and structures by using the harmonic wavelet transform.

Devolopment of numerical methods for dynamic responses of large-size machine structures.

Devolopment of step by step numerical integration scheme for large-sized nonlinear systems.

Education

Taking charge of following classes

Elements of Mechanics and Exercises A

Elements of Mechanics and Exercises B

Engineerin Dynamics

Dynamics of Machinery

Exercise of Dynamics of Machinery

Mechanical Vibration

Exercise of Mechanical Vibration

Others

Tutelage for a Graduation Thesis

Social activities

Manegement of reserch group in the JSME.

Chairman in an academic meeting.

Research

**Research Interests**

- Study on a Vibration System Automatically Following to Excitation Frequency

keyword : Natural Frequency, Forced Vibration, Dynamic Damper, Nonlinear Vibration

2010.04. - Study on non-destructive evaluation by detecting ultrasonic instantaneous frequency

keyword : Ultrasonic, Non-destructive evaluation, Instantaneous Frequency, Wavelet transform, Minute abnormality, Crack, delamination

2007.04Ultrasonic modulation of is a new knowledge which have been found by Prof. Inoue. This phenomenon shows frequency modulation of ultrasonic as it passes inner boundaries in object. The aim of this study is to detect minute cracks and delaminations in object through the ultrasonic modulation. An earlier detection of such cracks and delaminations is expected. . - Mode grouping technique for an efficient design of an automobile body

keyword : Vibration analysis, Characteristic mode, Mode grouping, Finite element method, Vibration control

2010.04. - Diagnoses of machine structures by utilizing vibration characteristics

keyword : Diagnosis, Vibration characteristics, Wavelet transform, Fatigue fracture, Slackness, Friction

1997.04If a machine in operation has a fault, signs of the fault appear in the monitored signal and are usually synchronizing with the operating speed. The signs are very small when the fault is at an early stage. The Fast Fourier Transform is often utilized to detect these signs, but it is very difficult to detect minute signs. The harmonic wavelet transform is utilized to detect the minute signs of small faults in a monitored signal. The monitored signal of a machine element in ordinary operation is regarded as periodic or quasi-periodic. It is important for the effectual detection of the minute signs to reduce the obstructive noise and the end effects in the signal. The end effect is a peculiar phenomenon to wavelet transform and hampers effective detection. Useful methods to reduce the obstructive noise and the end effects are devised herein by the authors. Even if no visible information pertaining to a fault appears in the monitored waveform, the present method is able to detect a minute sign of a small fault.. - Vibrations of probe and its countermeasures used for the defect detection of helical heating tubes in a fast breeder reactor

keyword : Frictional Vibration, Self-Excited Vibration, Vibration of Moving Body, Coupled Vibration

2002.04～2007.03An eddy current testing (ECT) probe is used for a diagnosis of a helical heating tube installed in a fast breeder reactor, and a vibration of ECT probe makes the diagnosis difficult. In our previous report, we pro-posed an analytical model of the ECT probe incorporating with a frictional force and confirmed that the vi-bration was caused by Coulomb friction. It is shown that numerical simulations utilizing the analytical model agree with various experimental results of the vibration of ECT probe, so that the reliability of the analytical model and the numerical simulation is increased. It follows that a preceding estimation of the vibration is available by the numerical simulation. Based on a behavior of the entire probe, which is obtained by the numerical simulation, we discuss a countermeasure to suppress the probe vibration. The validity of countermeasure is demonstrated through the numerical simulations.. - Step-by-step integration scheme by utilizing the cardinal B-splines

keyword : Step-by-step integration scheme, Cardinal B-splines

1998.04A new step-by-step integration scheme by utilizing the cardinal B-splines is presented. The new method organizes conventional implicit methods such as Newmark-β method and Wilson-θ method and so on, and provides a simple computation procedure so that the step-by-step integration can be carried out efficiently. In addition, when we analyze a nonlinear system with discontinuity the computational accuracy can be improved by the approximate detection of the discontinuous points by making good use of the two-scale relation. We formulate an algorithm of a time his-torical response analysis of a straight-line beam structure as an elementary example of multi-degree of freedom system besides a simple single degree of freedom system. The cardinal B-splines used here are only the ones of orders 3 and 4 but the other cardinal B-splines are also available for the step-by-step integration in the same way.. - Dynamic response analysis by the transfer influence coefficient method

keyword : Dynamic response analysis, Vibration analysis, Eigenvalue analysis, Force vibration, Time historical response

1995.04～2008.03The Transfer Influence Coefficient Method (hereafter: TICM) has an advantage in computational accuracy and speed. A remarkable feature of the TICM is its controllability on various boundary conditions only by means of an adjustment of spring constants. No numerical instability happens even if the spring constants become very large, and computational accuracy can be maintained. Such a treatment is inapplicable to the Transfer Matrix Method (TMM). This advantage of the TICM is also retained in a computation of high frequency range. Furthermore, the TICM has a high computational speed since the dimensions of matrices and vectors used in the algorithm are smaller than the ones of the TMM. The TICM is defeating the disadvantages of the TMM and is applicable to free vibration, forced vibration, transient response, and nonlinear response..

**Current and Past Project**

- Consulting for predictin of tool damage in ceramic grinding.
- (2)Vibrations of probe used for the defect detection of helical heating tubes in a fast breeder reactor

**Academic Activities**

**Reports**

**Papers**

1. | Diagnosis of bolt loosening using reflected ultrasonic pulse Ren Kadowaki, Shoki Ikeda, Takumi Inoue Transactions of the Japan Society of Mechanical Engineers DOI: 10.1299/transjsme.18-00202, [URL]. |

2. | Ren Kadowaki, Shoki Ikeda, Takumi Inoue, Diagnosis of bolt loosening using reflected ultrasonic pulse, Transactions of the Japan Society of Mechanical Engineers, 10.1299/transjsme.18-00202, 85, 871, DOI: 10.1299/transjsme.18-00202, 2019.02, [URL], Diagnosis of the bolt loosening is important in the industrial field and the medical field such as dental implants. This study proposes a new non-destructive testing method for the bolt loosening using ultrasonic pulse projected to the side of the bolt. This method focuses on the reflected pulse from the screw thread and its instantaneous frequency. A basic experiment with aluminum block and a stainless steel bolt shows that the tightening torque of the bolt can be evaluated via the instantaneous frequency of the reflected pulse from the screw thread. Decreasing the tightening torque, the instantaneous frequency reaches a maximal value earlier. We tried to verify the mechanism of the proposed method through an identification of the transmission paths and a numerical simulation. Real contact area on the load flank decreases, and the reflectance on the load flank changes when the tightening torque decreases. The analytical study shows that the change of the eflectance affects the received pulse. Especially, a peak time of the instantaneous frequency of the received pulse varies owing to the amplitude ratio of the reflected pulses from the load flank to the pulses reflected from the other contact surfaces. These analytical results follow the experimental results. Therefore, observing the peak time of the instantaneous frequency of the received ultrasonic pulse, we can obtain the reasonable index to diagnose the bolt loosening.. |

3. | New Diagnostic Method Using Instantaneous Frequency of Ultrasonic Pulse (Evaluation of Adhesive Strength of Epoxy Resin), Takumi Inoue, Takahiro Nakano, Transactions of the Japan Society of Mechanical Engineers, Vol.77 No.780, PP.2993-3006. |

4. | Estimation of Time-varying Vibration Parameters by the Segmental Use of the Harmonic Wavelet Takumi Inoue, Atsuo Sueoka, Shingo Okazawa Transactions of the Japan Society of Mechanical Engineers(C), May, 2008 Vol.74, No.741, PP.1145-1153. |

5. | Takumi Inoue, Atsuo Sueoka, Hiroyuki Kanemoto, Satoru Odahara, Yukitaka Murakami, Detection of minute signs of a small fault in a periodic or a quasi-periodic signal by the harmonic wavelet transform, Mechanical Systems and Signal Processing, 21-5, PP.2041-2045, 2007.07. |

6. | Takumi Inoue, Atsuo Sueoka, Yutaka Nakano, Hiroyuki Kanemoto, Yoshiyuki Imai, Toshihiko Yamaguchi, Vibrations of probe used for the defect detection of helical heating tubes in a fast breeder reactor Part 1. Experimental results by using mock-up, Nuclear Engineering and Design, 237-8, PP.858-867, 2007.04. |

7. | Takumi Inoue, Atsuo Sueoka, Takeshi Maehara, Yutaka Nakano, Hiroyuki Kanemoto, Vibrations of probe used for the defect detection of helical heating tubes in a fast breeder reactor Part 2. Vibration analysis and numerical simulations, Nuclear Engineering and Design, 237-8, PP.868-879, 2007.04. |

8. | Detection of an Abnormality in Steady-State Vibrations by Using the Harmonic Wavelet Takumi Inoue, Hiroyuki Kanemoto, Atsuo Sueoka, Satoru Otahara, Yukitaka Murakami Transactions of the Japan Society of Mechanical Engineers(C), July 2005 Vol.,71, No.707, PP.2147-2154. |

9. | Takumi Inoue, Atsuo Sueoka, A Step-by-Step Integration Scheme Utilizing the Cardinal B-Splines, JSME International Series C, 10.1299/jsmec.45.433, 45, 2, 433-441, 45, 2, PP.433-441, 2002.06. |

10. | Time Historical Response Analysis of Nonlinear Vibration Systems by the Step-by-Step Integration Scheme Utilizing the Transfer Influence Coefficient Method Takumi Inoue, Atsuo Sueoka Transactions of the Japan Society of Mechanical Engineers 65, 630, PP.433-440. |

**Membership in Academic Society**

- The Japan Society of Mechanical Engineers
- Japanese Society for Engineering Education

**Awards**

- Award of the Japan Society of Mechanical Engineers.

Study on responses structures by the Transfer Influence Coefficient Method. - The Hatakeyama award, the Japan Society of Mechanical Engineers.

Educational

**Educational Activities**

I teach following classes, which cover wide range of educational course, including basic course, specialized course, exercises and design, etc,.

I was awarded a prize for lecture 'Mechanical Vibration' from the department of engineering.

Introduction to Engineering

Elements of Mechanics and Exercises A

Elements of Mechanics and Exercises B

Fundamental Physics IA

Exercises in Mechanics

Dynamics of Machinery and Exercises

Mechanical Vibration and Exercises

Communication for Japanese

Mechanical Vibration and Acoustics

Structural Dynamics

I was awarded a prize for lecture 'Mechanical Vibration' from the department of engineering.

Introduction to Engineering

Elements of Mechanics and Exercises A

Elements of Mechanics and Exercises B

Fundamental Physics IA

Exercises in Mechanics

Dynamics of Machinery and Exercises

Mechanical Vibration and Exercises

Communication for Japanese

Mechanical Vibration and Acoustics

Structural Dynamics

**Other Educational Activities**

- 2013.05.

Social

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