GB1250596A - - Google Patents

Info

Publication number
GB1250596A
GB1250596A GB1250596DA GB1250596A GB 1250596 A GB1250596 A GB 1250596A GB 1250596D A GB1250596D A GB 1250596DA GB 1250596 A GB1250596 A GB 1250596A
Authority
GB
United Kingdom
Prior art keywords
vibrations
signal
oscillations
count
specimen
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
Application number
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Publication of GB1250596A publication Critical patent/GB1250596A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H13/00—Measuring resonant frequency
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
    • 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
    • G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
    • 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
    • G01N2203/003—Generation of the force
    • G01N2203/0032—Generation of the force using mechanical means
    • G01N2203/0039—Hammer or pendulum

Abstract

1,250,596. Measuring the damping coefficient of specimens. IWATANI SANGYO K.K., and K. SUGIMOTO. 18 Feb., 1970 [25 Feb., 1969], no. 7885/70. Heading G4H. In apparatus for measuring the damping coefficient Q of a specimen 3 (Fig. 4), the specimen is supported so that when it is struck it is capable of free decay vibrations, the vibrations being converted into an electrical signal the oscillations of which are counted in a counter 17 during the time taken for the amplitude of the oscillation to fall from A 0 to A 0 e-# where the amplitude of the signal is given by A = A 0 e-#fot/Q. Since when A = A 0 e<SP>-#</SP>, f 0 t/Q = 1 if the number of oscillations that have occurred is n = f 0 t, the count represents Q. The resonant frequency f 0 may also be measured by counting the number of oscillations in a fixed time interval determined for example by a time base 16. As described a magnetic pick-up 5 converts the vibrations to electrical form the electrical signal being initially attenuated by a factor e<SP>-#</SP> by a potential divider 9. When the attenuator output after rectification falls to a level Eg detected by a comparator 13 a bi-stable 14 enables a counter 70 to commence its count of the free decay vibrations and also switches a relay 10 so that the signal is fed unattenuated to the comparator. When the signal again falls to E 2 the count is terminated.
GB1250596D 1969-02-25 1970-02-18 Expired GB1250596A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1411469 1969-02-25

Publications (1)

Publication Number Publication Date
GB1250596A true GB1250596A (en) 1971-10-20

Family

ID=11852074

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1250596D Expired GB1250596A (en) 1969-02-25 1970-02-18

Country Status (3)

Country Link
DE (1) DE2008625A1 (en)
FR (1) FR2032956A5 (en)
GB (1) GB1250596A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2143036A (en) * 1983-07-08 1985-01-30 Atomic Energy Authority Uk Ultrasonic resonance for detecting changes in elastic properties
DE19700954A1 (en) * 1997-01-14 1998-07-16 Guenter Prof Dr Schmitt Method for detection of hydrogen in steels
DE102004018683B3 (en) * 2004-04-17 2005-09-08 Daimlerchrysler Ag Method for quality control of a work piece especially the seating between two components using a measure of vibration as an indication of quality

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4308751A (en) * 1978-04-13 1982-01-05 Thurner Heinz F Method for investigating an anchored rod-like body having an accessible end, and apparatus for carrying out the method
FR2498330A1 (en) * 1981-01-20 1982-07-23 Sydel RESONANCE CONTROL APPARATUS
DE3814172A1 (en) * 1988-04-27 1989-11-09 Battelle Institut E V DEVICE FOR DETECTING LUNKERN, DELAMINATIONS AND INHOMOGENIENTEEN

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2143036A (en) * 1983-07-08 1985-01-30 Atomic Energy Authority Uk Ultrasonic resonance for detecting changes in elastic properties
DE19700954A1 (en) * 1997-01-14 1998-07-16 Guenter Prof Dr Schmitt Method for detection of hydrogen in steels
DE102004018683B3 (en) * 2004-04-17 2005-09-08 Daimlerchrysler Ag Method for quality control of a work piece especially the seating between two components using a measure of vibration as an indication of quality

Also Published As

Publication number Publication date
FR2032956A5 (en) 1970-11-27
DE2008625A1 (en) 1971-02-11

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees