HSU Charge Prediction and Optimization Software for the EFV

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N00014-06-M-0191
Agency Tracking Number: N064-001-0036
Amount: $69,916.00
Phase: Phase I
Program: STTR
Awards Year: 2006
Solicitation Year: 2006
Solicitation Topic Code: N06-T001
Solicitation Number: N/A
Small Business Information
1109 Chesterfield Road, Huntsville, AL, 35803
DUNS: 124289294
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Alton Reich
 Project Manager
 (256) 694-5063
Business Contact
 Alton Reich
Title: Project Manager
Phone: (256) 694-5063
Email: alton.reich@streamlineautomation.bi
Research Institution
 Marianne Woods
 Office for Sponsored Programs
Tuscaloosa, AL, 35487
 (205) 348-5152
 Nonprofit college or university
The Marine Corps Expeditionary Fighting Vehicle utilizes 14 hydropneumatic suspension units (HSU) that have variable stiffness controlled by the nitrogen charge (mass) in each. Each HSU consists of a primary spring that contains a nominally 50/50 mixture of nitrogen and oil, and secondary spring that contains nitrogen with a small amount of oil. The vehicle ride height is effected by ambient temperature changes causing the nitrogen to expand or contract. The ride height must be maintained within a 4” operating band in order to achieve acceptable ride quality. The procedure for charging the HSUs currently involves jacking the EFV up and breaking the track in order to put the HSUs in a configuration where the volume is known. The current procedures takes an experienced maintenance crew more than 4 hours to complete. Streamline Automation and the University of Alabama propose to develop an EFV charging procedure that does not require the EFV to be jacked up. This will require the development of a model that accounts for the compressible, polytropic thermodynamic behavior of the nitrogen within the HSU, and the load transfer that takes place between the HSUs as they are charged while supporting the EFV weight.BENEFITS: Streamline Automation will work with the HSU manufacturer and the vehicle integrator during the Phase 1 effort. This will allow the models developed to be validated against existing test data, and to obtain customer concurrence from an early point in the program. This will make it more likely that the HSU charge optimization software will be accepted by these organizations, and used for initial factory adjustments, as well as by Marine Corps maintenance personnel. The EFV is expected to be the first of several vehicles that will use similar HSUs. Other vehicles, such as FCS will need similar charge optimization software.

* Information listed above is at the time of submission. *

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