Measuring and testing – Center of gravity; turning moment; metacentric height
Patent
1978-05-26
1980-05-13
Ruehl, Charles A.
Measuring and testing
Center of gravity; turning moment; metacentric height
73 1D, G01M 116
Patent
active
042022053
ABSTRACT:
A mass properties measurement system including a test object support table mounted to a bearing means for supporting the table for rotation about an axis of rotation substantially perpendicular to the plane of the support table; means for measuring overturning forces imparted to the measurement table and bearing means by a test object mounted to the support table, wherein the overturning forces tend to rotate the table and bearing means about a pivot axis substantially perpendicular to and intersecting the axis of rotation; induction motor drive means for inducing rotational forces to said support table and bearing means to rotate said support table and bearing means at a predetermined rate of rotation while remaining substantially invisible to said measuring means, the induction motor being mounted to the mass properties measurement system such that substantially all forces imparted to the system by the motor for rotating the table lie in a plane which is substantially perpendicular to said axis of rotation and which contains said pivot axis; and closed loop velocity control means for controllably driving the induction motor to drive the support table up or down to a predetermined rotational speed and to thereafter maintain the table of rotation at said predetermined speed.
REFERENCES:
patent: 3036467 (1962-05-01), McWhorter
patent: 3040563 (1962-06-01), Eckles et al.
patent: 3203224 (1965-08-01), Aske
patent: 3313139 (1967-04-01), Caumartin
patent: 3583205 (1971-06-01), Erle
MRC Corporation
Ruehl Charles A.
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