GB2019526A - Controlling Vibrations of Vibration-Testing Shaker Tables - Google Patents

Controlling Vibrations of Vibration-Testing Shaker Tables

Info

Publication number
GB2019526A
GB2019526A GB7910684A GB7910684A GB2019526A GB 2019526 A GB2019526 A GB 2019526A GB 7910684 A GB7910684 A GB 7910684A GB 7910684 A GB7910684 A GB 7910684A GB 2019526 A GB2019526 A GB 2019526A
Authority
GB
United Kingdom
Prior art keywords
vibrators
vibrations
controlled
test items
randomness
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
Application number
GB7910684A
Other versions
GB2019526B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Raytheon Co
Original Assignee
Hughes Aircraft Co
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
Priority claimed from US05/897,822 external-priority patent/US4181027A/en
Priority claimed from US05/897,821 external-priority patent/US4181026A/en
Application filed by Hughes Aircraft Co filed Critical Hughes Aircraft Co
Publication of GB2019526A publication Critical patent/GB2019526A/en
Application granted granted Critical
Publication of GB2019526B publication Critical patent/GB2019526B/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/20—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of a vibrating fluid
    • 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
    • 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
    • G01M7/06—Multidirectional test stands

Abstract

A shaker table 38 for vibrating test items 42 is vibrated in all directions by a plurality of vibrators 34 which are controlled a) in a preprogrammed manner to automatically vary their output to enhance the randomness of the vibrations to ensure that the table does not get locked on to a particular frequency and b) in response to feedback from the table to ensure that the test items are vibrated in a controlled manner. In the case of pneumatic vibrators, the randomness enhancing is achieved by means of a variable area orifice 58 in the air line between the supply 74 and the vibrators. A change in the orifice area is made automatically e.g. every 2-3 secs by a microprocessor controlled flow control mechanism 60. The feedback control is achieved by periodically sensing the input to the test items 42 by accelerometers 44, computing RMS response, comparing with a desired value and using the resulting error signal to control an air pressure regulator 66 in the air line to the vibrators. Thus the vibrations are limited to a preselected value. The spring stiffness and damping of the coupling 40 transmitting the vibrations to the table 38 may also be controlled. The vibrators are preferably of the impacting free piston type. <IMAGE>
GB7910684A 1978-04-19 1979-03-27 Controlling vibrations of vibration-testing shaker tables Expired GB2019526B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US05/897,822 US4181027A (en) 1978-04-19 1978-04-19 Nodal/modal control and power intensification methods and apparatus for vibration testing
US05/897,821 US4181026A (en) 1978-04-19 1978-04-19 Quasi-random pneumatic vibration facility and automatic frequency modulating system therefor

Publications (2)

Publication Number Publication Date
GB2019526A true GB2019526A (en) 1979-10-31
GB2019526B GB2019526B (en) 1982-09-02

Family

ID=27129187

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7910684A Expired GB2019526B (en) 1978-04-19 1979-03-27 Controlling vibrations of vibration-testing shaker tables

Country Status (7)

Country Link
JP (1) JPS54141161A (en)
DE (1) DE2913681C2 (en)
FR (1) FR2423766A1 (en)
GB (1) GB2019526B (en)
IT (1) IT1116025B (en)
NL (1) NL190085C (en)
SE (1) SE445144B (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2533465A1 (en) * 1982-09-24 1984-03-30 Thyssen Industrie VIBRATION TABLE COMPENSATING FORCES BY PRESSURE CHAMBERS AND ELASTIC SYSTEM
DE3837686A1 (en) * 1988-11-05 1990-05-10 Willi Bayer Three-dimensional oscillation system
EP1031827A2 (en) * 1999-02-22 2000-08-30 Ford Global Technologies, Inc. Method and system for dynamic testing of a vehicle exhaust system
WO2009064506A1 (en) 2007-11-15 2009-05-22 Venturedyne, Ltd. Monitoring of independent vibrators
ES2380525A1 (en) * 2009-05-11 2012-05-16 Fundación Para La Promoción De La Innovación, Investigación Y Desarrollo Tecnológico En La Industria De Automocion De Galicia Electronic signal switch for automatic control of multiaxial vibration system using external controller (Machine-translation by Google Translate, not legally binding)
GB2502196A (en) * 2012-05-16 2013-11-20 Venturedyne Ltd Vibration testing system and method
CN113496644A (en) * 2021-07-07 2021-10-12 吉林大学 Portable vibration teaching experiment table
CN114779650A (en) * 2022-06-17 2022-07-22 太原理工大学 Electromagnetic vibration table harmonic control system and method based on neural network inverse model
EP3953065A4 (en) * 2019-04-07 2022-12-28 Resonance Technology International Inc. Single-mass, one-dimensional resonant driver

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0365186A (en) * 1989-07-31 1991-03-20 Shimadzu Corp Electric fusion of yeast
DE102010027897B4 (en) 2010-04-19 2013-02-28 Sven Henze Schwingungsprüfeinrichtung
DE102010060955B8 (en) 2010-12-02 2012-10-04 Sven Henze Vibration test actuator with unbalance exciter
CN103063393B (en) * 2012-12-31 2015-03-04 浙江工业大学 Hanging device for horizontal modal test
DE102016206146A1 (en) * 2016-04-13 2017-10-19 Bayerische Motoren Werke Aktiengesellschaft Testing vehicle parts

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3686927A (en) * 1967-03-24 1972-08-29 Bolt Beranek & Newman Vibration testing method and apparatus
US3572089A (en) * 1969-02-04 1971-03-23 Nasa Peak acceleration limiter for vibrational tester
FR2047957A1 (en) * 1969-06-26 1971-03-19 Koppern Maschf
US3712125A (en) * 1970-09-25 1973-01-23 Koehring Co Load simulation system
GB1319115A (en) * 1970-11-04 1973-06-06 Russel Finex Vibratory apparatus
US3751994A (en) * 1971-01-18 1973-08-14 Mts System Corp Oscillatory signal system with turn on and turn off rate control
US3918298A (en) * 1974-07-29 1975-11-11 Mts System Corp Multiple actuator control system
JPS5218873A (en) * 1975-08-02 1977-02-12 Agency Of Ind Science & Technol Process for multiplying microorganisms
US4001749A (en) * 1975-12-17 1977-01-04 The Chase-Shawmut Company Electric fuse for elevated circuit voltages

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2533465A1 (en) * 1982-09-24 1984-03-30 Thyssen Industrie VIBRATION TABLE COMPENSATING FORCES BY PRESSURE CHAMBERS AND ELASTIC SYSTEM
DE3837686A1 (en) * 1988-11-05 1990-05-10 Willi Bayer Three-dimensional oscillation system
EP1031827A2 (en) * 1999-02-22 2000-08-30 Ford Global Technologies, Inc. Method and system for dynamic testing of a vehicle exhaust system
EP1031827A3 (en) * 1999-02-22 2003-04-16 Ford Global Technologies, Inc. Method and system for dynamic testing of a vehicle exhaust system
EP2209565B1 (en) * 2007-11-15 2018-01-10 Venturedyne, Ltd Monitoring of independent vibrators
WO2009064506A1 (en) 2007-11-15 2009-05-22 Venturedyne, Ltd. Monitoring of independent vibrators
ES2380525A1 (en) * 2009-05-11 2012-05-16 Fundación Para La Promoción De La Innovación, Investigación Y Desarrollo Tecnológico En La Industria De Automocion De Galicia Electronic signal switch for automatic control of multiaxial vibration system using external controller (Machine-translation by Google Translate, not legally binding)
GB2502196A (en) * 2012-05-16 2013-11-20 Venturedyne Ltd Vibration testing system and method
US9377375B2 (en) 2012-05-16 2016-06-28 Venturedyne, Ltd. Repetitive shock vibration testing system and method
GB2502196B (en) * 2012-05-16 2017-09-20 Venturedyne Ltd Vibration testing system and method
EP3953065A4 (en) * 2019-04-07 2022-12-28 Resonance Technology International Inc. Single-mass, one-dimensional resonant driver
CN113496644A (en) * 2021-07-07 2021-10-12 吉林大学 Portable vibration teaching experiment table
CN114779650A (en) * 2022-06-17 2022-07-22 太原理工大学 Electromagnetic vibration table harmonic control system and method based on neural network inverse model

Also Published As

Publication number Publication date
NL190085C (en) 1993-10-18
NL7903092A (en) 1979-10-23
FR2423766A1 (en) 1979-11-16
DE2913681A1 (en) 1979-10-25
IT1116025B (en) 1986-02-10
SE445144B (en) 1986-06-02
JPH0156698B2 (en) 1989-12-01
FR2423766B1 (en) 1984-12-07
GB2019526B (en) 1982-09-02
NL190085B (en) 1993-05-17
DE2913681C2 (en) 1982-05-27
IT7948760A0 (en) 1979-04-17
JPS54141161A (en) 1979-11-02
SE7903350L (en) 1979-10-20

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19950327