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The suspension systems can each withstand 600, 750, of 1200 lb, and can be used in parallel to accomodate larger ISS rack weight applications.
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The MEL approach is to measure the component's generated inertial forces. This force is a product of the full diagonal matrix including the test setup (the center of gravity, mass moment of inertia, and weight) and the resolved rigid body acceleration vector derived from the 10 MEL QA-700 servo control accelerometers. The measured motion of the rigid body is characterized through the MEL test and post processing of the accelerometer data is done to calculate the rigid body component forces and moments at the center of gravity or interface science region of interest for the test unit. The mass moment of inertia is measured using the bifilar torsional pendulum method. Many output data formats are processed and stored for each test including time history domain force and moment data, as well as frequency domain force and moment power spectral density (PSD), linear spectrum in narrowband or one-thrid octave band representations.
Vertical mounting space for testing is 3 by 3.5 by 7 ft. Typical component assemblies can be moutned 2 by 2 by 2 ft. The suspension systems can each withstand 600, 750, of 1200 lb, and can be used in parallel to accomodate larger ISS rack weight applications. |
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