Discussion: “The Loading-Frequency Relationship in Multiple Eigenvalue Problems” (Huseyin, K., and Roorda, J., 1971, ASME J. Appl. Mech., 38, pp. 1007–1011)

1972 ◽  
Vol 39 (2) ◽  
pp. 635-636
Author(s):  
E. F. Masur
Keyword(s):  
Eigenvalue Problems ◽  
Multiple Eigenvalue ◽  
Loading Frequency ◽  
Frequency Relationship

The Loading-Frequency Relationship in Multiple Eigenvalue Problems

1971 ◽  
Vol 38 (4) ◽  
pp. 1007-1011 ◽  
Author(s):  
K. Huseyin ◽  
J. Roorda
Keyword(s):  
Eigenvalue Problems ◽  
Stability Boundary ◽  
Conservative System ◽  
Free Vibrations ◽  
Degree Of Freedom ◽  
External Loading ◽  
Loading Frequency ◽  
Multiple Loading ◽  
The Stability ◽  
Frequency Relationship

The free vibrations of a linear conservative system with multiple loading parameters are studied, attention being restricted to pure eigenvalue problems. It is shown that the smallest frequency and external loading parameters of such a system constitute a strictly convex (synclastic) surface which cannot have convexity toward the origin of the “parameter space.” It is further proved that in the case of systems with one degree of freedom only, the surface takes the form of a plane. The practical implications of these results regarding the estimation of the frequencies and/or the stability boundary of the system are discussed. Thus it is observed that, on the basis of the established theorems, lower bounds to the frequencies at any stage of external loading and/or upper bounds to the stability boundary are readily obtainable. A two-degree-of-freedom illustrative example is discussed.

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