Type of Awards: SBIR Phase I and Phase II, Contract Numbers: N00017-88-C-0031and N61533-89-C-0062 Agencies: U.S. Navy David Taylor Research Center and U.S. Naval Sea Command Status: Completed Periods: 1/14/88 to 7/14/88 and 6/30/89 to 9/30/91 Phase III: Dynamic Simulation of High-Power Machinery Systems; N00167-99-D-0100 Principal Investigator: Paul Krause Abstract: A detailed computer representation of the shipboard electric power distribution system was developed and verified in Phase I. This set the stage for developing reduced order models for the components of the shipboard electric power system and to use the detailed computer models as a means of verifying the reduced order models individually and in a system configuration. Development of reduced order models and the equations necessary to connect these models in any feasible system configuration is the first objective of the proposed research. The second is to begin defining transient and dynamic stability and system security for a finite inertia electric system for normal and emergency operating conditions. Achieving these goals is necessary in order to provide a means to design and investigate the performance of proposed shipboard electric power...
Read MorePhase I: Control of Resonance in a 20-Khz Space Power System and Investigation of Advanced Power Sources (MSFC) and Phase II: Investigation of Advanced Power Sources and Actuator Systems for Future Aerospace Vehicles (LeRC)
Type of Awards: SBIR Phase I and Phase II Contract Numbers: NAS8-38035 and NAS3-25962 Agencies: Phase I: NASA MSFC and Phase II:Ā NASA LeRC Status: Completed Periods: 12/29/88 to 5/29/89 and 8/31/90 to 8/30/92 Principal Investigators: Phase I:Ā Paul Krause; Phase II: Scott Sudhoff Phase III: Power Systems Modeling for Power-By-Wire Applications; NAS3-27203 Abstract: In Phase I, detailed computer simulations of two candidate 20-kHz spacecraft power systems (TRW and GD) were implemented on a Hybrid Computer/Power Systems Simulator and verified by comparison with experimental results. In the absence of filtering, both systems exhibit harmonic resonances due to an interaction between the switching of the source converter and the ac system. Methods of suppressing harmonic resonance and improving the waveform quality were demonstrated in both power systems studied. The primary objective of the proposed Phase II research is to investigate power system configurations for use in future aerospace vehicles including spacecraft and the all-electric airplane. The power systems will be investigated on an end-to-end basis including the source(s), transmission/distribution system, load converters, and electromechanical actuators. The computer models that are to be developed in Phase II will provide a convenient means of comparing competing power system configurations from the standpoint of stability, regulation, harmonic distortion, and system interactions, all on an end-to-end system...
Read MoreDynamic Simulation of High-Power Machinery Systems
Type of Awards: SBIR Phase I and Phase II Contract Numbers: N61533-95-C-0107 and N00024-97-C-4097 Agency: U.S. Naval Surface Warfare Center and U.S. Naval Sea Command Status: Completed Periods: 8/23/95 to 6/30/96 and 3/13/97 to 5/1/99 Principal Investigators: Paul Krause and Steve Pekarek Phase III: Dynamic Simulation of High-Power Machinery Systems; N00167-99-D-0100, Subcontracted: Purdue andĀ PCKA Abstract: Over the past 7-8 years, PCKA has been heavily involved in the analysis and simulation of power/drive systems. This work has been done through SBIRās and level-of-effort contracts for the Navy, Air Force, NASA, and, to a lesser extent, the Army. Considerable focus has been on developing models and modeling techniques. A major breakthrough by PCKA/Purdue, which has the potential of revolutionizing power/drive system analysis and simulation, has been the automatic state matrix generator as a āfront endā to a differential-equation-based simulation language (ACSL). This state model generator (SMG) offers the potential of (1) a circuit-based input to a equation-based language (2) convenient and economical simulations, (3) automatic state-space averaging, (4) semi-automatic nonlinear reduced-order modeling, (5) automatic modal reduction, and (6) automatic model connection. Although all these features are promising concepts, none have been developed to the extent necessary for convenient utilization. The focus of the proposed work is to continue research toward the development of these techniques in ACSL and to make the SMG and the associate techniques compatible with MATLAB. The overall objective is to develop a user-interactive system modeler which will lead the system analyst through the steps to implement a system model making use of the potential offered by the SMG. Focus will be on the Navy IPS; however, this work will be valid for the power/drive systems being used or considered by other agencies. Moreover, this work not only represents a breakthrough in simulation, it also automatically provides the mathematical structure to analyze and develop linear and nonlinear controls for power/drive systems. Although the control aspects are not topics of the proposed work, the guidelines for the mathematical structure appropriate for analysis and design of nonlinear system controls will naturally...
Read MoreMulti-Level Heterogeneous Modeling of F22 Power Subsystem
Type of Awards: SBIR Phase I and Phase II with Enhancements: Ā (1) Inclusion of Easy 5 and Optimal Model Partitioning and Allocation and (2) Power and Cooling Turbo-Generator Contract Numbers: F33615-98-C-2849, and F33615-99-C-2911 Agency: U.S. Air Force Research Laboratory Status: Completed Periods: 5/3/98 to 11/3/98 and3/12/99 to 1/19/05 Principal Investigators: Brian Kuhn / E. A. Walters Phase III: Aerospace Power Scholarly Research Program; F33615-99-D-2974 Abstract: Techniques developed in Phase I allow, for the first time, the interconnection of any number of ACSL simulations implemented in conventional or dedicated computer networks.Ā It appears that the same techniques may be used to parallel not only ACSL simulations but any combination of ACSL, Saber, and/or Matlab/Simulink models.Ā The development of this distributed computing concept in Phase II will provide a marked increase in computation speed and a means of simulating large power-electronic based systems.Ā Moreover, this will allow vendors to interconnection component simulations into a āpublic domainā system without sharing proprietary information.Ā For example, vendors could simulate their component in any of the above mentioned languages and interconnect their simulation to a system model that would include, for example, sources, distribution network, loads, and associated controls that collectively comprise the core of the selected power system architecture.Ā Virtual prototyping has suffered from the rightful desire of vendors to maintain their competitive edge.Ā The concept proposed herein eliminates this proprietary problem and, for the first time, provides a workable prototyping environment.Ā The Phase II goal is to develop an efficient distributed computer simulation of a F22-like power system and to demonstrate this new prototyping environment through an Industry...
Read MoreMulti-Level Heterogeneous Modeling of the Advanced Amphibious Assault Vehicle (AAAV)
Type of Award: STTR Phase I and Phase II with Funded Enhancement Subcontractors: Purdue Contract Numbers: M67004-99-C-0044 and M67854-00-C-3047 Agency: U.S. Marine Corp Status: Completed Periods: 7/13/99 to 6/13/00 and 5/23/00 to 8/31/03 Principal Investigator: E. A. Walters Abstract: The primary objective of the Phase I effort was to determine the feasibility of a heterogeneous modeling environment for the Advanced Amphibious Assault Vehicle (AAAV). This has been clearly established. In particular, a method of connecting any number of independent time-domain simulations has been developed and used to demonstrate a detailed heterogeneous computer simulation of the salient components of the AAAV electric power system. The primary objective of the Phase II effort is to establish a flexible and powerful distributed modeling and analysis environment for the AAAV electrical power system that can be used to evaluate design alternatives, predict performance characteristics during normal and abnormal (e.g. battle damage) conditions, and serve as a simulation testbed for future design modifications. This facility will reduce engineering and development costs, identify optimum design choices, and avoid unanticipated problems during development and fielding of the AAAV, thereby increasing affordability over its life cycle. Specific tasks to be performed include: the development and validation of a detailed heterogeneous end-to-end simulation of the AAAV electric power system, the development of a multi-level visualization and control interface, the investigation of high-speed computational clusters to improve the computational speed, and the investigation of multi- and parallel rate integration...
Read MoreAero Propulsion and Power Technology
Type of Awards: SBIR Phase I and Phase II with Funded Enhancements Subcontractors: Purdue Contract Numbers: F33615-03-M-2385 and FA8650-04-C-2482 Agency: U.S. Air Force Research Laboratory Status: Completed Periods: 7/10/03 to 4/10/04 and 6/4/04 to 2/24/09 Principal Investigator: E. A. Walters Abstract: PC Krause and Associates, Inc. (PCKA) has developed two key technologies in modeling, simulation, and analysis for support of the design and optimization of large-scale systems. The first of these key technologies is a partitioned finite-element (FE) technique wherein computation times for transient FE models have been reduced by two-orders of magnitude when compared to a commercial FE simulator and has been applied to permanent-magnet, switched-reluctance, and wound-rotor synchronous machines. This increase in computational speed has enabled FE models to be integrated with circuit simulations as part of a design optimization algorithm wherein tradeoffs can be rapidly evaluated in a systematic search for a globally optimal design. The second technology is a variable-fidelity multi-physics simulation infrastructure that enables the user to select between finite-element models that may require hours to days of simulation time through constructive (algebraic) models that may execute hundreds to thousands of times faster than real...
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