95 and 96 to a first input terminal of amplifier 97 a high frequency noise bypass capacitor 98 is also connected between the first input terminal amplifier 97 and ground terminal 91 a biasing resistor 99 is connected between a second input terminal of amplifier 97 and ground and a feedback resistor 101 is also connected between the output terminal of amplifier 97 and the second input terminal resistors 99 and 101 are designed to control the gain of amplifier 97 in a manner well known in the art as is set forth above with the appropriate assumptions and characterizations a turbine generator set can be represented by a system of n inertias or masses and n 1 springs n being equal to or greater than the number of the highest natural frequency considered this system can be represented as an undamped system in free vibration by a second order matrix differential equation of the form where m and k are the mass and stiffness matrices of order n u00d7 n respectively and u03c6 is the vector of angular displacements and u03c6 its second derivative with respect to time of order n u00d7 1 this equation can be put into the standard eigenvalue form and the solution will yield one natural frequency of zero which will not be considered and n 1 natural frequencies u03c9 j.