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 ?
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.
Young adult males completed a set of random vibration and nonvibration exercise bouts whilst squatting vibrating plate.
Random vibration is defined as non-deterministic, which means that future behavior cannot be predicted precisely.
Next the performance of MEMS sensor was validated through the acquisition of a random vibration signal generated on a vibrating table.
The following system level tests were carried out to qualify for the launch: sine vibration, random vibration, shock, thermal cycling, and thermal vacuum.
3 utilizes four pneumatically-actuated vibration hammers providing 6 dof random vibration with x,y,z axis and roll, pitch and yaw rotation.
Lockheed Martin (NYSE: LMT) and NASA engineers said they have verified the Orion spacecraft successfully passed an important environmental test called multi-point random vibration testing.
The degrees of freedom considered for vehicle system's vertical random vibration study and lateral random vibration study are listed respectively in Tables 1 and 2.
Single point or frequency sweep loading is available, and techniques are also available to equivalence random vibration to harmonic vibration.
The muscular activity level in the forearms increases in response to random vibration transmitted to the bicycle to control handlebar movements.
Readers are assumed to have some background in structural analysis, structural dynamics, probability theory, and random vibration.
For example, the higher stress on the lines due to the higher startup motor torque - a transient problem; the impact force of liquid refrigerant slugging from the compressor at certain startup conditions - a liquid hammer problem; and the fatigue risk during shipping - a random vibration problem, .