Vibration testing based on impulse response excited by laser ablation (Input sensorless FRF measurements)

Naoki Hosoya, Itsuro Kajiwara, Takahiko Hosokawa

Research output: Contribution to journalArticle

Abstract

The authors have proposed an analyzing method for vibration testing based on impulse excitation by laser ablation in order to experimentally identify dynamic characteristics of micro devices such as HDD head actuators or MEMS that have in the high frequency region the natural frequencies of a few tens of kilohertz. This paper proposes a method that makes it possible to analyze FRF by only measuring the output (acceleration response) in a laser excitation experiment. This enables the measurement of the force input sensorless. First, the laser excitation force is normalized by Newton's second law using a rigid block. Next, the laser excitation experiment with an object structure having a natural frequency within the high frequency region is conducted. Complex Fourier spectrum obtained by Fourier transforming the measured response is divided by the estimated laser excitation force. Finally, since the trigger position of the response and the time the impulse input is actually applied have errors, phase characteristics of the force-regulated complex Fourier transform is modified by taking the dead time included in the response into account, resulting in the FRF of the structure. The effectiveness of the proposed method is demonstrated by the vibration test with an aluminum block as object structure.

Original languageEnglish
Pages (from-to)102-113
Number of pages12
JournalNihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C
Volume77
Issue number773
Publication statusPublished - 2011

Fingerprint

Laser excitation
Laser ablation
Impulse response
Testing
Natural frequencies
MEMS
Fourier transforms
Actuators
Experiments
Aluminum

Keywords

  • Dead Time
  • Frequency Response Function
  • High Frequency Vibration
  • Impulse Response
  • Input Sensorless
  • Laser Ablation
  • Newton's Second Low

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Industrial and Manufacturing Engineering

Cite this

@article{080d1128fd684c26bd0072873de5ec92,
title = "Vibration testing based on impulse response excited by laser ablation (Input sensorless FRF measurements)",
abstract = "The authors have proposed an analyzing method for vibration testing based on impulse excitation by laser ablation in order to experimentally identify dynamic characteristics of micro devices such as HDD head actuators or MEMS that have in the high frequency region the natural frequencies of a few tens of kilohertz. This paper proposes a method that makes it possible to analyze FRF by only measuring the output (acceleration response) in a laser excitation experiment. This enables the measurement of the force input sensorless. First, the laser excitation force is normalized by Newton's second law using a rigid block. Next, the laser excitation experiment with an object structure having a natural frequency within the high frequency region is conducted. Complex Fourier spectrum obtained by Fourier transforming the measured response is divided by the estimated laser excitation force. Finally, since the trigger position of the response and the time the impulse input is actually applied have errors, phase characteristics of the force-regulated complex Fourier transform is modified by taking the dead time included in the response into account, resulting in the FRF of the structure. The effectiveness of the proposed method is demonstrated by the vibration test with an aluminum block as object structure.",
keywords = "Dead Time, Frequency Response Function, High Frequency Vibration, Impulse Response, Input Sensorless, Laser Ablation, Newton's Second Low",
author = "Naoki Hosoya and Itsuro Kajiwara and Takahiko Hosokawa",
year = "2011",
language = "English",
volume = "77",
pages = "102--113",
journal = "Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C",
issn = "0387-5024",
publisher = "Japan Society of Mechanical Engineers",
number = "773",

}

TY - JOUR

T1 - Vibration testing based on impulse response excited by laser ablation (Input sensorless FRF measurements)

AU - Hosoya, Naoki

AU - Kajiwara, Itsuro

AU - Hosokawa, Takahiko

PY - 2011

Y1 - 2011

N2 - The authors have proposed an analyzing method for vibration testing based on impulse excitation by laser ablation in order to experimentally identify dynamic characteristics of micro devices such as HDD head actuators or MEMS that have in the high frequency region the natural frequencies of a few tens of kilohertz. This paper proposes a method that makes it possible to analyze FRF by only measuring the output (acceleration response) in a laser excitation experiment. This enables the measurement of the force input sensorless. First, the laser excitation force is normalized by Newton's second law using a rigid block. Next, the laser excitation experiment with an object structure having a natural frequency within the high frequency region is conducted. Complex Fourier spectrum obtained by Fourier transforming the measured response is divided by the estimated laser excitation force. Finally, since the trigger position of the response and the time the impulse input is actually applied have errors, phase characteristics of the force-regulated complex Fourier transform is modified by taking the dead time included in the response into account, resulting in the FRF of the structure. The effectiveness of the proposed method is demonstrated by the vibration test with an aluminum block as object structure.

AB - The authors have proposed an analyzing method for vibration testing based on impulse excitation by laser ablation in order to experimentally identify dynamic characteristics of micro devices such as HDD head actuators or MEMS that have in the high frequency region the natural frequencies of a few tens of kilohertz. This paper proposes a method that makes it possible to analyze FRF by only measuring the output (acceleration response) in a laser excitation experiment. This enables the measurement of the force input sensorless. First, the laser excitation force is normalized by Newton's second law using a rigid block. Next, the laser excitation experiment with an object structure having a natural frequency within the high frequency region is conducted. Complex Fourier spectrum obtained by Fourier transforming the measured response is divided by the estimated laser excitation force. Finally, since the trigger position of the response and the time the impulse input is actually applied have errors, phase characteristics of the force-regulated complex Fourier transform is modified by taking the dead time included in the response into account, resulting in the FRF of the structure. The effectiveness of the proposed method is demonstrated by the vibration test with an aluminum block as object structure.

KW - Dead Time

KW - Frequency Response Function

KW - High Frequency Vibration

KW - Impulse Response

KW - Input Sensorless

KW - Laser Ablation

KW - Newton's Second Low

UR - http://www.scopus.com/inward/record.url?scp=84856357619&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84856357619&partnerID=8YFLogxK

M3 - Article

VL - 77

SP - 102

EP - 113

JO - Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C

JF - Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C

SN - 0387-5024

IS - 773

ER -