Stentor Satellite Equipment mounted in satellites must withstand acoustic-driven random vibration at liftoff and during the transonic and maximum dynamic pressure phases of flight. The equipment must be designed and test accordingly. The equipment is mounted on shaker tables for the random vibration testing,… Read more
Ring Laser Gyros Acronyms: IMU – inertial measurement unit INS – inertial navigation system RLG – ring laser gyro * * * An INS uses the output from an IMU, and combines the information on acceleration and rotation with initial information about position, velocity and… Read more
Here is a paper for… Extending Steinberg’s Fatigue Analysis of Electronics Equipment Methodology to a Full Relative Displacement vs. Cycles Curve electronic_rd_n.pdf extending_Steinberg.pptx This paper also shows in a very roundabout way that “fatigue damage equivalence” between sine and random vibration occurs when the sine… Read more
Pyrotechnic devices such as linear shaped charge and frangible joints are used for stage and fairing separation in launch vehicles. These devices generate high-frequency mechanical shock energy. Avionics components mounted in the vehicle must be designed and tested to withstand this shock energy. Thus, ground… Read more
Shock and vibration test specifications for avionics and military equipment have almost always been specified in terms of acceleration. The main reason is that acceleration can easily be measured by accelerometers. Velocity sensors are also available but are less common. Gaberson, Chamblers et al, claim… Read more
Launch vehicle avionics components must be designed and tested to withstand random vibration environments. These environments are often derived from flight accelerometer data of previous vehicles. This data tends to be nonstationary as shown in the figure above. The typical method for post-processing is to… Read more
I have written some tutorials on avionics component isolation which may be downloaded at: avionics_iso.pdf six_dof_isolated.pdf * * * The Matlab GUI scripts are given in the GUI package at: Vibrationdata Matlab GUI Package The function is accessed via: Miscellaneous > Structural Dynamics > Spring-Mass… Read more