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Combined Loads, Vibration and Modal Testing of the QuickScat Spacecraft, Scharton(JPL), Vujcich(Ball), 18th ATS, 3/16-18/1999; Combining Spacecraft Vibration & Acoustic Tests, Terry Scharton, S/C & L/V Dynamic Environments Workshop, June 1999; Direct, Near-Field Acoustic Tests, Larkin & Tsoi, S/C & L/V Dynamic Environments Workshop, June 1999
Current contracts include work in aerodynamics and flow control, aeroacoustics, computational aeroelasticity, wind tunnel testing, aircraft structural analysis, rotorcraft, intelligent systems, fuel cell and battery technologies, smart small scale projectiles, embedded computing, unmanned aerial vehicles, and flight stability and control.
The technique of vibrational analysis with scanning probe microscopy allows probing vibrational properties of materials at the submicrometer scale, and even of individual molecules. [ 1 ] [ 2 ] [ 3 ] This is accomplished by integrating scanning probe microscopy (SPM) and vibrational spectroscopy ( Raman scattering or/and Fourier transform ...
The Shock and Vibration Information Analysis Center (SAVIAC) is a U.S. Government organization established by the U.S. Navy Office of Naval Research on 20 December 1946. SAVIAC's purpose is to promulgate information on the transient and vibratory response of structures and materials.
A shaker is a device that excites the object or structure according to its amplified input signal. Several input signals are available for modal testing, but the sine sweep and random frequency vibration profiles are by far the most commonly used signals. Small objects or structures can be attached directly to the shaker table. With some types ...
The example shows how the Rayleigh's quotient is capable of getting an accurate estimation of the lowest natural frequency. The practice of using the static displacement vector as a trial vector is valid as the static displacement vector tends to resemble the lowest vibration mode.
Structural response to random vibration is usually treated using statistical or probabilistic approaches. Mathematically, random vibration is characterized as an ergodic and stationary process. A measurement of the acceleration spectral density (ASD) is the usual way to specify random vibration.
The natural frequency of this flexural vibration mode is characteristic for the dynamic Young's modulus. To minimize the damping of the test-piece, it has to be supported at the nodes where the vibration amplitude is zero. The test-piece is mechanically excited at one of the anti-nodes to cause maximum vibration. Test-piece vibrating in the ...
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