random vibration


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random vibration

[′ran·dəm vī′brā·shən]
(mechanics)
A varying force acting on a mechanical system which may be considered to be the sum of a large number of irregularly timed small shocks; induced typically by aerodynamic turbulence, airborne noise from rocket jets, and transportation over road surfaces.
References in periodicals archive ?
Such vibration and consequent failures can be mitigated using a new series of Particle Impact Dampers (PID) developed originally by NASA to reduce random vibration in PCB assemblies in harsh environments.
6] and the random vibration will be produced for structure, irregularly.
During experiment, seated volunteers were exposed to Gaussian random vibration with frequency band 1-15 Hz at two level of amplitude (low vibration amplitude and medium vibration amplitude) for 20-minutes in separate days.
To simulate the random nature of road excitation input, a random vibration test is developed and typically used for body/frame mounted components.
Finally, a random vibration fatigue analysis was conducted to analytically predict the fatigue life.
The advanced view should plot relative stress intensity distribution in the component pins, balls or leads, resulting from the simultaneous six axes of random vibration during vibration or linear static acceleration stress analysis.
In contrast, random vibration testing simultaneously stimulates the test item with many frequencies, causing multiple resonances to be excited.
The shock resistance is at 10G acceleration (11ms duration) and vibration resistance is at 5~500Hz 1G RMS random vibration.
A 1 Og RMS random vibration profile might have some limitations depending upon the armature size and the amplifier limitations, something which Bruel and Kjaer always points out during the product specification stage to suggest alternatives and make sure that the customer test expectations can be met.
The results show that the MEMS-based oscillator performs better than all quartz oscillators that were tested, with up to 50x better EMS, up to 24x better performance during shock, and up to 100x and 20x better performance during sinusoidal and random vibration, respectively.
The hybrid polynomial chaos and pseudoexcitation method have been proposed to evaluate the random vibration response in the linear structure system with uncertain parameters under external random excitation [27].
Validation to TRL6 is to be achieved through coupon tests on representative hardware in a bespoke environmental chamber, subjecting the coupons to combined heat and random vibration loading, supported by full size PCBs integrated and tested at engine level.