Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Mechanical measurement system
Patent
1996-12-20
1999-03-16
Trammell, James P.
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Mechanical measurement system
364512, 73761, 73862043, G01L 100, G01L 300
Patent
active
058842322
ABSTRACT:
A NASTRAN-programmed computer calculates force and moment data for a structure including joints of interest. The NASTRAN data is read by a computer programmed with the invented program. For each joint, the user selects the members which contribute forces to the joint, and also selects the nearest grid point. A computer programmed with the invented program calculates the resultant force and moment at the proximate grid point. The force and moment are originally defined in a global coordinate system, subsequently transformed into a local coordinate system, and then translated to the centroid of the joint's fastener pattern. Axial and shear forces for each fastener are calculated for the nominal case wherein all of the fasteners are operative. Furthermore, each fastener, in turn, is assumed not to transmit axial force and the resulting fail-safe axial forces respectively acting on the remaining operative fasteners are calculated. Fastener forces are screened to determine the critical nominal axial and shear forces, and the critical fasteners which transmit the foregoing critical forces; in addition to the critical fail-safe axial force and consonant critical fail-safe fastener.
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Smith Demetra R.
Stout Donald E.
Trammell James P.
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