TORVAP-A: A computer program for the torsional vibration analysis of multi-junction, multi-branch systems

Abstract

This paper describes a torsional vibration analysis program suitable for handling multi-junction multi-branched systems with damping and excitation torques (provided by engines, compressors, marine propellers, etc) applied at many points in the individual branches. The method used is the 2 × 2 matrix method, developed by the British Internal Combustion Engine Research Institute, for branched systems. This method is considered to be a major advance on other methods of vibration analysis since it is faster and cheaper for repeated use than either the current Holzer table method, the field matrix method or the iteration methods. It is also more flexible, permitting the user to include modifications and to ask various questions concerning the behaviour of specific parts of the installation investigated, to which specific answers are provided without having to evaluate all the conditions at all points in the system.