GB1397334A - System for digitally controlling a vibration testing environment or apparatus - Google Patents
System for digitally controlling a vibration testing environment or apparatusInfo
- Publication number
- GB1397334A GB1397334A GB1994872A GB1994872A GB1397334A GB 1397334 A GB1397334 A GB 1397334A GB 1994872 A GB1994872 A GB 1994872A GB 1994872 A GB1994872 A GB 1994872A GB 1397334 A GB1397334 A GB 1397334A
- Authority
- GB
- United Kingdom
- Prior art keywords
- vibration
- vibrator
- frames
- fourier transform
- random signal
- 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.)
- Expired
Links
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
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Feedback Control In General (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
1397334 Automatic control of vibration TIME DATA CORP 28 April 1972 [22 July 1971] 19948/72 Heading G3R A vibrating platform or means for producing a vibrating environment (e.g. using sound), for testing equipment, is driven by a random signal controlled by the system shown so that a specimen is subjected to vibration having a predetermined frequency spectrum. Vibration is detected by a device 101, e.g. an accelerometer, having a transfer function h(t); its output y(t) also has a noise factor h(t) and the specification explains mathematically how this is elimated by obtaining the "cross spectral density" from the Fourier transform of the input x(k) to the vibrator as well as its output y(k) and comparing this with the desired (reference) spectrum R(K) at 106. The result is multiplied with a random signal from a generator 109 and the product, after conversion by an inverse Fourier transform device III is used to drive the vibrator. The analogue measurement and drive signals are converted into digital form for processing, e.g. by a general purpose computer. Processing is not continuous but occurs in batches, termed "frames" Fig.5 (not shown). If the inherent delays in the system exceed the duration of a frame, the same input is repeated for one or more frames Fig.6, (not shown). A system which does not eliminate noise in the signals is also described but not claimed Figs. 1... 4 (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US16517671A | 1971-07-22 | 1971-07-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1397334A true GB1397334A (en) | 1975-06-11 |
Family
ID=22597781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1994872A Expired GB1397334A (en) | 1971-07-22 | 1972-04-28 | System for digitally controlling a vibration testing environment or apparatus |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS5218873B1 (en) |
| DE (1) | DE2220416C3 (en) |
| GB (1) | GB1397334A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1989000722A1 (en) * | 1987-07-17 | 1989-01-26 | Hughes Aircraft Company | Adaptive noise cancellation in a closed loop control system |
| US7827010B2 (en) | 2004-10-15 | 2010-11-02 | Xax Kft. | Device and process for examining the signals of systems releasing them during operation or in response to external excitation |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3329261A1 (en) * | 1983-08-12 | 1985-02-28 | Kazanskij aviacionnyj institut imeni A. N. Tupoleva, Kazan' | Arrangement for testing products by random and harmonic vibrations |
| JPH0658282B2 (en) * | 1988-11-01 | 1994-08-03 | アイエムブイ株式会社 | Vibration control device |
| JP2803875B2 (en) * | 1989-12-27 | 1998-09-24 | アイエムブイ 株式会社 | Vibration control device and method |
| RU2745342C1 (en) * | 2020-06-09 | 2021-03-24 | Акционерное общество «Информационные спутниковые системы» имени академика М.Ф. Решетнёва» | Method of testing for high-intensity shock effects of devices and equipment |
-
1972
- 1972-04-26 DE DE19722220416 patent/DE2220416C3/en not_active Expired
- 1972-04-28 JP JP47042332A patent/JPS5218873B1/ja active Pending
- 1972-04-28 GB GB1994872A patent/GB1397334A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1989000722A1 (en) * | 1987-07-17 | 1989-01-26 | Hughes Aircraft Company | Adaptive noise cancellation in a closed loop control system |
| US7827010B2 (en) | 2004-10-15 | 2010-11-02 | Xax Kft. | Device and process for examining the signals of systems releasing them during operation or in response to external excitation |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5218873B1 (en) | 1977-05-24 |
| DE2220416C3 (en) | 1975-02-27 |
| DE2220416A1 (en) | 1973-02-01 |
| DE2220416B2 (en) | 1974-07-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PE20 | Patent expired after termination of 20 years |