Man/Machine Interaction Dynamics and Performance Analysis, Biomechanics, and Ndiscos Multibody Equations

Abstract

The Man/Machine Interaction Dynamics and Performance (MMIDAP) analysis project seeks to create an ability to study the consequences of machine design alternatives relative to the performance of both the machine and its operator. The MMIDAP problem highlights the conflicting needs and views of groups that focus on machine design and groups that focus on human performance, ergonomics, and cumulative injury potential. This chapter will overview and update ongoing MMIDAP capability development efforts being undertaken by a rather loose group of collaborating researchers. An attempt will also be made to highlight problems associated with using traditional multibody mechanical system analysis tools for musculoskeletal dynamics analysis at the level of fidelity needed by the biomechanics community. In particular problems associated with using traditional multibody system tools for viscoelastically restrained joints and multiple muscle systems will be discussed and enhanced solution approaches proposed. Additionally a definition of the capabilities and underlying theoretics of the multibody dynamics code NDISCOS (order N Dynamic Interaction Simulation of COntrols and Structure) will be provided. This code, originally referred to as DISCOS, has been significantly enhanced since its inital 1978 release. Capabilities and associated theoretics which have been previously reported in brief disconnected status papers are collected herein and concisely developed from end to end with appropriate source papers referenced.