GB1399629A - Method and apparatus for measuring the modulus and the mechanical damping of a material - Google Patents
Method and apparatus for measuring the modulus and the mechanical damping of a materialInfo
- Publication number
- GB1399629A GB1399629A GB4287072A GB4287072A GB1399629A GB 1399629 A GB1399629 A GB 1399629A GB 4287072 A GB4287072 A GB 4287072A GB 4287072 A GB4287072 A GB 4287072A GB 1399629 A GB1399629 A GB 1399629A
- Authority
- GB
- United Kingdom
- Prior art keywords
- counter
- cycle
- oscillation
- modulus
- mechanical damping
- 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
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0021—Torsional
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Measurement Of Unknown Time Intervals (AREA)
Abstract
1399629 Measuring torsional modulus electrically DUNLOP Ltd 15 Sept 1972 [15 Sept 1971] 42870/72 Addition to 1331810 Heading G1N Apparatus for measuring the torsional modulus and mechanical damping of a sample of material 12, Fig.1, fixed to a base plate 32, comprises a coil 11 attached to the free end of the sample between two field coils 14 fed with A.C. from a source 13, the voltage induced in coil 11 when the sample is made to oscillate in damped torsional mode being analyzed to measure the frequency and log dec, which are indicative of the torsional modulus and mechanical damping respectively. The induced voltage is demodulated at 47, Fig.2, and fed to trigger circuit 17 which produces a square pulse corresponding to each positive halfcycle, Fig.3, the starts of two consecutive pulses opening and closing a counter 16 for clock pulses from a generator 22, the count being indicative of the periodic time of oscillation and therefore inversely proportional to frequency and indicative of the torsion modulus. Via line 34, the second of the two pulses introduces a two second delay before clearing counter 16 and resets the frequency of generator 22 for the next measurement. The demodulated oscillation signal in coil 11 is also fed to a trigger 27 and two memory stores 23, 24. Trigger 27 produces a square pulse for each positive half-cycle, starting when the oscillation voltage exceeds a threshold level 28 and terminating at the end of that half-cycle. The amplitude A o of the first oscillation positive half cycle is stored in memory 23, and the amplitude of the first half-cycle which does not reach the level 28, e.g. A2 as shown, is stored in memory 24, whilst counter 26 determines how many consecutive pulses have occurred, up to a maximum of four. The difference between voltages A 0 and A2 (as shown) in stores 23, 24 is discharged through an R.C. circuit 40, the time taken for the difference to be eliminated being measured by counter 16 using the clock pulses from generator 22, this time being proportional to log A 0 /A 2 and is proportional to the log dec and mechanical damping. Counter 26 introduces a factor depending on its pulse count.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19712146132 DE2146132B2 (en) | 1971-09-15 | 1971-09-15 | METHOD AND CIRCUIT FOR MEASURING THE TORSION MODULE AND THE DAMPING OF A SAMPLE |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1399629A true GB1399629A (en) | 1975-07-02 |
Family
ID=5819639
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4287072A Expired GB1399629A (en) | 1971-09-15 | 1972-09-15 | Method and apparatus for measuring the modulus and the mechanical damping of a material |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE2146132B2 (en) |
GB (1) | GB1399629A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4376387A (en) * | 1980-07-24 | 1983-03-15 | Products And Patents Ltd. | Dynamic shock absorber evaluator |
GB2233098A (en) * | 1989-06-07 | 1991-01-02 | Weyrad Electronics Ltd | A method of testing the damping of a rotary member |
US20160204725A1 (en) * | 2013-09-11 | 2016-07-14 | Volvo ConstructionEquipment AB | Self adjusting generator speed control |
-
1971
- 1971-09-15 DE DE19712146132 patent/DE2146132B2/en active Granted
-
1972
- 1972-09-15 GB GB4287072A patent/GB1399629A/en not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4376387A (en) * | 1980-07-24 | 1983-03-15 | Products And Patents Ltd. | Dynamic shock absorber evaluator |
GB2233098A (en) * | 1989-06-07 | 1991-01-02 | Weyrad Electronics Ltd | A method of testing the damping of a rotary member |
GB2233098B (en) * | 1989-06-07 | 1993-08-04 | Weyrad Electronics Ltd | A method of testing the damping of a rotary member |
US20160204725A1 (en) * | 2013-09-11 | 2016-07-14 | Volvo ConstructionEquipment AB | Self adjusting generator speed control |
EP3044638A4 (en) * | 2013-09-11 | 2017-08-30 | Volvo Construction Equipment AB | Self adjusting generator speed control |
US10985681B2 (en) | 2013-09-11 | 2021-04-20 | Blaw-Knox Corporation | Self adjusting generator speed control |
Also Published As
Publication number | Publication date |
---|---|
DE2146132B2 (en) | 1973-08-30 |
DE2146132A1 (en) | 1973-03-29 |
DE2146132C3 (en) | 1974-03-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |