628. Some Problems Associated With Product of Inertia Verification of a Large Blunted Cones


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J B Harris: 628. Some Problems Associated With Product of Inertia Verification of a Large Blunted Cones. 1967.



This paper presents the results of a study to determine the feasibility of verifying the products of inertia of a large blunted cone, considered a rigid structure, using a quadrafilar pendulum. The feasibility study encompassed the following activities:
1) A survey to determine what apparatus and procedures have been used to measure the products of inertia of aeronautical and aerospace vehicles and what accuracies have been achieved;
2) Consideration of advantages and disadvantages of several types of measurement systems and selection of one or more that appear to be best suited for the particular application in mind;
3) Analytical investigation of the characteristics of the selected system and prediction of the error inherent in its use.
Brief system descriptions, including advantages and disadvantages are presented in Figures 1, 2, and 3 for types of systems that seem best suited for the cone application. These systems are the spin table/inverted torsion bar, the torsion bar suspension, and the quadrafilar pendulum. Reasons for selecting the quadrafilar pendulum are discussed.
A study of the characteristics of the quadrafilar pendulum as applied to the cone application has uncovered some interesting possibilities and advantages. The most interesting is the possibility of defining the moment of inertia ellipsoid by testing with the cone inclined at large angles to the roll reference axis only.


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