In an undamped linear structure, two distinct normal modes are orthogonal with respect to which matrix?
Correct answer: B. The mass matrix
- A. The identity matrix only
- B. The mass matrix
- C. The load vector
- D. The support reaction matrix
Explanation
Distinct normal modes of an undamped linear structure satisfy mass orthogonality, and also stiffness orthogonality under the usual conditions. The mass matrix appears directly in the relation φi transpose M φj = 0 for different modes.
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