GB1305894A - - Google Patents
Info
- Publication number
- GB1305894A GB1305894A GB1305894DA GB1305894A GB 1305894 A GB1305894 A GB 1305894A GB 1305894D A GB1305894D A GB 1305894DA GB 1305894 A GB1305894 A GB 1305894A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transducers
- filters
- vibrations
- pass
- locating
- 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
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Vibration Prevention Devices (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
1305894 Vibration source locating G D FIRKINS 13 Feb 1970 [8 Jan 1969] 1188/69 Heading H4D An assembly for locating the source of vibrations in a structure (e.g. unwanted noises in a motor vehicle chassis or bodywork) comprises separately movable transducers for converting the vibrations into electrical signals and each having a mount for readily attaching it to and detaching it from a chosen position on the structure, and circuitry for transmitting signals, of a frequency characteristic of a particular vibration source, from a selected transducer to an output arrangement for comparing the amplitudes of the vibrations detected by the transducers. In the Fig. 2 embodiment transducers 1a<SP>1</SP>-1d<SP>1</SP> are attached by magnets or rubber suction pads to the structure and a selected pair is coupled via matching circuits 2a<SP>1</SP>, 2b<SP>1</SP>, tunable narrow bandpass filters 3a<SP>1</SP>, 3b<SP>1</SP> and amplifiers 4a<SP>1</SP>, 4b<SP>1</SP> to a pair of earphones 5a<SP>1</SP>, 5b<SP>1</SP>. Low-pass and high-pass filters 7a<SP>1</SP>, 7b<SP>1</SP>, 8a<SP>1</SP>, 8b<SP>1</SP>, whose tuning is ganged with filters 3a<SP>1</SP>, 3b<SP>1</SP>, shunt to earth frequencies above and below the pass band of filters 3a<SP>1</SP>, 3b<SP>1</SP>. The transducers are re-positioned to search out positions of maximum vibration amplitude. In alternative embodiments each transducer is provided with its own matching, filtering, amplifying and amplitude-indicating channel (Fig. 1, not shown) or all transducers are switched in turn to a single channel (Fig. 3, not shown).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB118869 | 1969-01-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1305894A true GB1305894A (en) | 1973-02-07 |
Family
ID=9717702
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1305894D Expired GB1305894A (en) | 1969-01-08 | 1969-01-08 |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1305894A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3125981A1 (en) * | 1981-07-01 | 1983-03-03 | German Dipl.-Ing. 8061 Hebertshausen Grimm | Monitoring circuit for protecting devices, in particular high voltage line towers, supported on a plurality of feet |
DE3204698A1 (en) * | 1981-07-01 | 1983-08-18 | German Dipl.-Ing. 8061 Hebertshausen Grimm | Monitoring circuit for protecting devices, in particular high-voltage power-line towers, supported on a plurality of feet |
CH677761A5 (en) * | 1989-02-20 | 1991-06-28 | Hans Wepfer | Tractor coupling monitoring device - uses microphone to detect noise emitted by coupling fed to loudspeaker within tractor cab |
-
1969
- 1969-01-08 GB GB1305894D patent/GB1305894A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3125981A1 (en) * | 1981-07-01 | 1983-03-03 | German Dipl.-Ing. 8061 Hebertshausen Grimm | Monitoring circuit for protecting devices, in particular high voltage line towers, supported on a plurality of feet |
DE3204698A1 (en) * | 1981-07-01 | 1983-08-18 | German Dipl.-Ing. 8061 Hebertshausen Grimm | Monitoring circuit for protecting devices, in particular high-voltage power-line towers, supported on a plurality of feet |
CH677761A5 (en) * | 1989-02-20 | 1991-06-28 | Hans Wepfer | Tractor coupling monitoring device - uses microphone to detect noise emitted by coupling fed to loudspeaker within tractor cab |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |