An Investigation of Integrated System Dynamic Simulation
 for Reciprocating Machinery, 03-9201

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Principal Investigator
Fernand A. Thomassy

Inclusive Dates: 07/01/00 - Current

Background - The state-of-the-art in machinery simulation is constantly advancing. Simulation technologies have traditionally been segregated into specialties that solve one aspect of a system's behavior while ignoring or greatly simplifying the interaction of related components. This method was acceptable in traditional design methodologies but is increasingly inadequate in the context of the "design for life" approach currently emerging in industry. In addition, the analysis and resolution of performance problems demand models that fully characterize dynamic behavior and facilitate understanding of root causes. The goal of this project is to provide better predictive tools for the design, analysis, and understanding of mechanical systems. These issues are addressed through the integration of key technologies to model and characterize critical parameters of an existing system.          

Approach - The investigators are following an incremental approach to integrate the several deterministic simulation techniques. The principle is simple in that the researchers start with current state-of-the-art (but traditionally separate) techniques for simulation and then integrate them. This first approach allows the investigators to establish a baseline for comparison. Additionally, each level of integration will be verified individually and the importance measured. A Clark HBA gas compressor/engine has been selected as the subject of the investigation because the investigators are familiar with this engine, and have access to drawings and data. Simulation of this engine requires integration of the key technologies that are the focus of this research.

The baseline analysis includes creating geometric, finite element, kinematic and dynamic, and lubrication models based upon current engineering practice. The results of these analyses not only form a baseline for comparison to the integrated simulation but also lay the foundation upon which that integration will be built. Integration of component flexibility, engine and compressor loads, as well as lubrication film will be completed using the ADAMS™ dynamic solver. Existing techniques for including geometry and finite element data from Pro/ENGINEER™ and ANSYS™ and customized subroutines to integrate SwRI-developed software such as Southwest Pro Bearing and VIPRE™ will be used to develop a comprehensive system dynamic model that works within ADAMS™. The resulting simulation will increase the accuracy of lubrication, stress, and dynamic simulation through simultaneous simulation of these interdependent factors.

Accomplishments - Baseline modeling is in progress, and no significant results are available. Next quarter, the team will take the first major steps in creating an integrated simulation.

Computer-aided engineering model of the Clark HBA cranktrain assembly

Fluid and Machinery Dynamics Program
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