Laser Doppler vibrometer: unique use of DOE/Taguchi methodologies in the arena of pyroshock (10 to 100,000 HZ) response spectrum

C. J. Litz Jr.

doi:10.1117/12.185341

8 September 1994 Laser Doppler vibrometer: unique use of DOE/Taguchi methodologies in the arena of pyroshock (10 to 100,000 HZ) response spectrum

C. J. Litz Jr.

Author Affiliations +

Proceedings Volume 2358, First International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1994) https://doi.org/10.1117/12.185341
Event: Vibration Measurements by Laser Techniques: First International Conference, 1994, Ancona, Italy

Abstract

Discussed is the unique application of design of experiment (DOE) to structure and test a Taguchi L₉ (3²) factorial experimental matrix (nine tests to study two factors, each factor at three levels), utilizing an HeNe laser Doppler vibrometer and piezocrystal accelerometers to monitor the explosively induced vibrations through the frequency range of 10 to 10⁵ Hz on a flat steel plate (96 X 48 X 0.25 in.). An initial discussion is presented of pyrotechnic shock, or pyroshock, which is a short-duration, high-amplitude, high-frequency transient structural response in aerospace vehicle structures following firing of an ordnance item to separate, sever missile skin, or release a structural member. The development of the shock response spectra (SRS) is detailed. The use of a laser doppler for generating velocity- acceleration-time histories near and at a separation distance from the explosive and the resulting generated shock response spectra plots is detailed together with the laser doppler vibrometer setup as used. The use of DOE/Taguchi as a means of generating performance metrics, prediction equations, and response surface plots is presented as a means to statistically compare and rate the performance of the NeHe laser Doppler vibrometer with respect to two different piezoelectric crystal accelerometers of the contact type mounted directly to the test plate at the frequencies in the 300, 3000, and 10,000 Hz range. Specific constructive conclusions and recommendations are presented on the totally new dimension of understanding the pyroshock phenomenon with respect to the effects and interrelationships of explosive charge weight, location, and the laser Doppler recording system. The use of these valuable statistical tools on other experiments can be cost-effective and provide valuable insight to aid understanding of testing or process control by the engineering community. The superiority of the HeNe laser Doppler vibrometer performance is demonstrated.

Citation Download Citation

C. J. Litz Jr. "Laser Doppler vibrometer: unique use of DOE/Taguchi methodologies in the arena of pyroshock (10 to 100,000 HZ) response spectrum", Proc. SPIE 2358, First International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (8 September 1994); https://doi.org/10.1117/12.185341

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available