Pilots at the National Test Pilot School are conducting a Ground Vibration Test (GVT) on an Aermacchi MB-339, a military jet trainer and light attack aircraft, to analyze its dynamic behavior under varying conditions.
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The case described in this article examines the modal characteristics of a satellite model acquired from performing experimental modal analysis. A hammer impact test was carried out with two teardrop uni-axial accelerometers (mounted in different directions) to study the modal behavior. The roving excitation method assists in completely avoiding the potential mass loading side effect produced by a roving response procedure. A hard tip was selected to excite the higher frequency modes.
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A violin was suspended on a frame to a imitate free-free boundary condition. Sentek Dynamics’ BT-100M shaker was used to excite a violin at the base of its front panel. Polytec’s PSV500 laser scanner was used to measure and acquire the data from the back panel of the violin. Crystal Instrument’s EDM Modal software processed and analyzed the dataset to provide the modal parameters of the violin.
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Multiple shaker systems are typically used for vibration testing when the unit under test (UUT) is too long or too heavy to test with a single shaker. This approach overcomes the limitations of high drive requirements with a single shaker test. Multiple shaker systems also allow the UUT to be tested in various configurations and directions in the horizontal and vertical orientations.
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Ground Vibration Testing (GVT) includes the modal analysis of an aircraft and its sub-assembly components to analyze and detect any changes to their structural properties.
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Crystal Instruments CoCo-80X handheld dynamic signal analyzer allows users to acquire measurements with unparalleled convenience in the field. The rugged design features a compact display for quick, easy, and accurate data recording and analysis. This powerful hardware system is now combined with Crystal Instruments patented GPS time synchronization technology, featuring a time accuracy of 100 ns. Users can now execute Operational Modal Analysis to study the dynamic characteristics of large structures such as bridges and buildings.
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The rugged and intuitive CoCo-80X handheld system is now combined with Crystal Instruments’ patented GPS time synchronization technology (featuring a time accuracy of 100 ns) to further expand field measurement capabilities. Users are now able to execute Operational Modal Analysis using the handheld CoCo-80X to study the dynamic characteristics of large structures such as bridges and buildings.
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Watch our new Ground Vibration Testing video with narration by Walter Kemphaus, Product Manager. To learn more about Ground Vibration Testing, visit: https://www.crystalinstruments.com/ground-vibration-test
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The Canadian Space Agency recently performed the Modal Analysis of a RADARSAT Satellite using five modal shakers. It is important to obtain the modal analysis of the unit-under-test because information about the natural frequencies, damping coefficients and mode shapes can be used to optimize its design and improve its structural behavior. The modal parameters about the mechanical properties of a structure help users understand its vibration characteristics during operating conditions.
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The rugged and portable CoCo hardware allows users to perform convenient measurement recordings and analysis in the field. Field operations are extended with the integration of EDM Modal software to provide a seamless modal analysis procedure.
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The experimental object in this modal test is a hood cross-flow fan with an overall structure that includes a roulette wheel, rotor frame and cross-flow blades that are composed of metal materials. The fan is hung using bungee cords to imitate free-free boundary conditions.
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The United States Patent & Trademark Office awarded U.S. Patent No. 11,287,351 B2 for Vibration Visualization with Real-Time and Interpolation Features to Dr. James Zhuge (CEO), Dr. Jeff Zhao (Senior Product Manager), and Aakash Umesh Mange (Senior Application Engineer) on March 29, 2022.
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Modal testing verifies the accuracy of simulation results and determines the structural characteristics of various products. The following test designates a train brake disc as the test object. The modal parameters and mode shape of the train are studied and analyzed. The test piece is shown in the following figure.
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The experimental object undergoing modal analysis in this paper is a medical MRI QBC carrier structure, which is used to support patients laying in beds. The entire carrier is comprised of FRP composite material, and a thin board sheet installed with chips, capacitors, resistors, and other components is adhered in the middle section. For the experimental modal test, the carrier is hung using elastic ropes to imitate free-free boundary conditions.
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