MODIFICATION OF METHOD APPLICATION PROCEDURE FOR EIGEN FREQUENCY CHANGED BY OPTIMIZED VALUES AND LOCATIONS OF ADDITIONAL LOADS

Abstract

Earlier the author suggested methods of modifying the first eigen frequency by optimization of values and locations of additional loads. Methods based on the use of specific properties of eigen frequency allow achieving the optimum solution only when all limits for additional loads values have the form of strict inequalities. In all other cases these methods provide the stage-by-stage movement to optimum solutions but do not ensure their absolute accomplishment. The paper suggests to change the procedure of method applications such that only one nodal point would be detected at design stages which is less sensible to the location of additional loads in the loading task and more sensible to the mass decrease in the task of the frequency increase. This modification allows taking into consideration the difference between sensibilities of nodal points that approximates the solution to its optimum.