Vibration control evaluation for underwater structures using non-contact laser excitation

Koh Umenai, Naoki Hosoya, Itsuro Kajiwara

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A system that uses non-contact laser excitation based on pulsed-laser ablation is proposed to evaluate vibration suppression of fully submerged underwater structures. Although impact testing with an impulse hammer is commonly used in vibration analysis due to the simplicity of the apparatus, impact testing has limitations in underwater applications. Additionally vibration testing in dangerous conditions (e.g., deep oceans, under ice, and nuclear reactor plants) is difficult. The proposed method yields the frequency spectrum by applying a pulsed-laser-ablation excitation force to the structure and measuring the output using a laser Doppler vibrometer. Because the direction, strength, and effective duration of the pulsed-laser-ablation force are essentially constant, it is possible to obtain the dynamic characteristics of an underwater structure using only the output frequency spectrum. The validity of the proposed system is demonstrated by comparing the frequency spectrum suppressed by passive vibration control to that without a control.

Original languageEnglish
Title of host publicationMOVIC 2014 - 12th International Conference on Motion and Vibration Control
PublisherJapan Society of Mechanical Engineers
Publication statusPublished - 2014
Event12th International Conference on Motion and Vibration Control, MOVIC 2014 - Sapporo, Hokkaido, Japan
Duration: 2014 Aug 32014 Aug 7

Other

Other12th International Conference on Motion and Vibration Control, MOVIC 2014
CountryJapan
CitySapporo, Hokkaido
Period14/8/314/8/7

Fingerprint

Underwater structures
Laser excitation
Vibration control
Laser ablation
Pulsed lasers
Impact testing
Hammers
Vibration analysis
Nuclear reactors
Ice
Lasers
Testing

Keywords

  • Frequency spectrum
  • Laser ablation
  • Non-contact laser excitation
  • Passive vibration control in water
  • Underwater structure

ASJC Scopus subject areas

  • Control and Systems Engineering

Cite this

Umenai, K., Hosoya, N., & Kajiwara, I. (2014). Vibration control evaluation for underwater structures using non-contact laser excitation. In MOVIC 2014 - 12th International Conference on Motion and Vibration Control Japan Society of Mechanical Engineers.

Vibration control evaluation for underwater structures using non-contact laser excitation. / Umenai, Koh; Hosoya, Naoki; Kajiwara, Itsuro.

MOVIC 2014 - 12th International Conference on Motion and Vibration Control. Japan Society of Mechanical Engineers, 2014.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Umenai, K, Hosoya, N & Kajiwara, I 2014, Vibration control evaluation for underwater structures using non-contact laser excitation. in MOVIC 2014 - 12th International Conference on Motion and Vibration Control. Japan Society of Mechanical Engineers, 12th International Conference on Motion and Vibration Control, MOVIC 2014, Sapporo, Hokkaido, Japan, 14/8/3.
Umenai K, Hosoya N, Kajiwara I. Vibration control evaluation for underwater structures using non-contact laser excitation. In MOVIC 2014 - 12th International Conference on Motion and Vibration Control. Japan Society of Mechanical Engineers. 2014
Umenai, Koh ; Hosoya, Naoki ; Kajiwara, Itsuro. / Vibration control evaluation for underwater structures using non-contact laser excitation. MOVIC 2014 - 12th International Conference on Motion and Vibration Control. Japan Society of Mechanical Engineers, 2014.
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AB - A system that uses non-contact laser excitation based on pulsed-laser ablation is proposed to evaluate vibration suppression of fully submerged underwater structures. Although impact testing with an impulse hammer is commonly used in vibration analysis due to the simplicity of the apparatus, impact testing has limitations in underwater applications. Additionally vibration testing in dangerous conditions (e.g., deep oceans, under ice, and nuclear reactor plants) is difficult. The proposed method yields the frequency spectrum by applying a pulsed-laser-ablation excitation force to the structure and measuring the output using a laser Doppler vibrometer. Because the direction, strength, and effective duration of the pulsed-laser-ablation force are essentially constant, it is possible to obtain the dynamic characteristics of an underwater structure using only the output frequency spectrum. The validity of the proposed system is demonstrated by comparing the frequency spectrum suppressed by passive vibration control to that without a control.

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