CA2348320A1 - Modal analysis method and apparatus therefor - Google Patents
Modal analysis method and apparatus therefor Download PDFInfo
- Publication number
- CA2348320A1 CA2348320A1 CA 2348320 CA2348320A CA2348320A1 CA 2348320 A1 CA2348320 A1 CA 2348320A1 CA 2348320 CA2348320 CA 2348320 CA 2348320 A CA2348320 A CA 2348320A CA 2348320 A1 CA2348320 A1 CA 2348320A1
- Authority
- CA
- Canada
- Prior art keywords
- sets
- acoustic pressure
- input
- data
- vibration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004458 analytical method Methods 0.000 title abstract 4
- 230000000875 corresponding effect Effects 0.000 abstract 4
- 230000000295 complement effect Effects 0.000 abstract 3
- 230000005284 excitation Effects 0.000 abstract 2
- 238000000034 method Methods 0.000 abstract 2
- 230000002596 correlated effect Effects 0.000 abstract 1
- 238000013016 damping Methods 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
A modal analysis method and apparatus for acoustically determining dynamic vibration characteristics of a structure, including natural frequencies, mode shapes and damping factors, is based on a Multiple-Input-Single-Output (MISO) model. The method and apparatus involve generation of an acoustic excitation signal toward n spatially distributed locations associated with the structure while the latter is held to allow vibration thereof, one of the locations being chosen as a reference location. A series of microphones are disposed at the locations to produce m complementary sets of n input acoustic pressure-related electrical signals, one of these being chosen as a reference signal associated with the reference location. A Fourier analysis is performed on the sets of input acoustic pressure-related electrical signals to provide corresponding sets of correlated input acoustic pressure-related data in the frequency domain including reference data associated with the reference signal. A vibration transducer such as an accelerometer is used to sense induced output vibration in response to the acoustic excitation at a reference point on the excited structure corresponding to the reference location to produce m complementary sets of output vibration response electrical signals, which are then converted through Fourier analysis into corresponding sets of output vibration response data in the frequency domain. Then, from relations between m corresponding complementary sets of n input transfer functions characterizing the correlation between each set of input acoustic pressure-related data and the reference data from one hand, and m sets of output vibration response data on the other hand, the structural transfer functions characterizing each said set of input acoustic pressure- related data are obtained. Finally, the dynamic vibratory characteristics of the acoustically excited structure are derived from the resulting structural transfer functions through usual calculation techniques.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2348320 CA2348320C (en) | 2001-05-18 | 2001-05-18 | Modal analysis method and apparatus therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2348320 CA2348320C (en) | 2001-05-18 | 2001-05-18 | Modal analysis method and apparatus therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2348320A1 true CA2348320A1 (en) | 2002-11-18 |
| CA2348320C CA2348320C (en) | 2006-01-17 |
Family
ID=4169090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2348320 Expired - Lifetime CA2348320C (en) | 2001-05-18 | 2001-05-18 | Modal analysis method and apparatus therefor |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2348320C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659765A (en) * | 2022-02-28 | 2022-06-24 | 东风柳州汽车有限公司 | Method, equipment, storage medium and device for testing constrained mode of gearbox shell |
| CN116299147A (en) * | 2023-03-13 | 2023-06-23 | 中国科学院声学研究所 | A sound source localization method in one-dimensional structure based on acoustic coherence technology |
-
2001
- 2001-05-18 CA CA 2348320 patent/CA2348320C/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659765A (en) * | 2022-02-28 | 2022-06-24 | 东风柳州汽车有限公司 | Method, equipment, storage medium and device for testing constrained mode of gearbox shell |
| CN114659765B (en) * | 2022-02-28 | 2024-07-16 | 东风柳州汽车有限公司 | Method, equipment, storage medium and device for testing constraint mode of gearbox shell |
| CN116299147A (en) * | 2023-03-13 | 2023-06-23 | 中国科学院声学研究所 | A sound source localization method in one-dimensional structure based on acoustic coherence technology |
| CN116299147B (en) * | 2023-03-13 | 2023-11-28 | 中国科学院声学研究所 | One-dimensional structure internal sound source positioning method based on acoustic coherence technology |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2348320C (en) | 2006-01-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20210518 |