Time and frequency domain low order, low frequency approximation of mechanical systems

TL;DR

This paper introduces a new method for low-order, low-frequency approximation of linear mechanical systems that avoids explicit transfer function computation, simplifying control design for complex systems.

Contribution

A novel approximation method for mechanical systems that does not require explicit transfer function expressions, applicable to infinite-dimensional systems.

Findings

Method successfully approximates systems in three examples

Avoids explicit transfer function computation

Applicable to infinite-dimensional systems

Abstract

Control design for linear, time-invariant mechanical systems typically requires an accurate low-order approximation in the low frequency range. For example a series expansion of the transfer function around zero consisting of a mass, velocity, and compliance term. Because computing such a series expansion of the transfer function can be cumbersome, a new method to compute low-order approximations of mechanical systems is developed in this paper. The method does not require an explicit expression for the transfer function, which is not always available for infinite-dimensional systems. The advantages of the proposed method is demonstrated in three examples.