METHOD AND DEVICE FOR MEASURING UNDERWATER VEHICLE HULL VIBRATION; PATENT
A method and device for measuring higher mode vibrational energy is provided. The device includes a plurality of sensors placed with uniform spacing around the circumference of a structure and a processing unit. The sensor placement may be either on the inside or the outside of a structure depending on the structure and on the experiment. In operation, signals from individual sensors, preamplified if required, are fed to processing equipment. The processing equipment performs a double Fast Fourier Transform. The first transform is done on temporal data thereby providing an output representing a frequency spectrum. The second transform is performed on simultaneous data readings from all sensor locations thereby providing an output representing a spectrum of mode numbers. The combining of these outputs provides a three-dimensional plot of amplitude versus frequency and mode number.
- Filed 25 Jul 91 patented 4 May 93; Supersedes PAT-APPL-7-735 986.; This Government-owned invention available for U.S. licensing and, possibly, for foreign licensing. Copy of patent available Commissioner of Patents, Washington, DC 20231.; Patent
Department of the NavyWashington, DC United States
- Striffler, F L
- Publication Date: 0
- Pagination: 5 p.
- TRT Terms: Amplitude (Physics); Energy; Equipment; Fast Fourier transforms; Frequency (Electromagnetism); Hulls; Mathematical models; Measurement; Numbers; Operations; Output; Patents; Signals; Structures; Uniforms; Vibration
- Old TRIS Terms: Processing equipment; Underwater equipment
- Subject Areas: Administration and Management; Bridges and other structures; Energy; Marine Transportation;
- Accession Number: 00666562
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: PAT-APPL-7-735 986; PATENT-5 207 100
- Files: TRIS
- Created Date: Oct 3 1994 12:00AM