On the Dynamic Rigidity of the Bender with Three Rollers

Studies on the Bourdon Tube Pressure Gauge (7th Report)

Abstract

In case that we discuss the accuracy of the Bourdon tube pressure gauge, it is supposed that errors of the shape and dimension of the Bourdon tube which arise from manufacturing process, especially the errors of the radius and the thickness, are respectively one of a primary factor which has influence upon the accuracy. But the relation between these errors and the dynamic rigidity of the bender has not been found before. In this paper we regard the bender as a structure which consists of three rollers and the Bourdon tube, and by means of F. E. M. we analyzed how the dynamic rigidity of the roller system would have influence on the errors of the Bourdon tube in the manufacturing process. From the nature of the subject we also considered the Eigenvalue problem and its acceleration technique, especially the Origin Shift Method and estimation of initial values to the number of the Origin Shift, etc.