Patent ID: 6252334
Filing Date: 2001-06-26
Classification: B64G,F16F,G05D,H01L

Abstract:
A control unit for controlling strain in a foundation member, the control unit comprising an assembly being a pre-formed patch containing a base, a piezoelectric sensor and a piezoelectric actuator located in operative relative relationship, means for placing the assembly in operative relationship with the foundation member whereby the sensor detects a strain in the foundation member and whereby the actuator imparts a strain-inducing force to the foundation member, means for connecting control electronics in operative relationship with the assembly, and the control electronics including a programmable digital compensator, the compensator having means for periodically storing and updating an input list of most recent input values and an output list of most recent output values, and means for determining a new output value as a weighted algebraic sum of selected ones of the input and output values of the input and output lists.