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HSU Charge Prediction and Optimization Software for the EFV

Award Information

Department of Defense
Award ID:
Program Year/Program:
2006 / STTR
Agency Tracking Number:
Solicitation Year:
Solicitation Topic Code:
Solicitation Number:
Small Business Information
Streamline Automation, LLC
3100 Fresh Way SW Huntsville, AL 35805-6720
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Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Phase 1
Fiscal Year: 2006
Title: HSU Charge Prediction and Optimization Software for the EFV
Agency / Branch: DOD / NAVY
Contract: N00014-06-M-0191
Award Amount: $69,916.00


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.

Principal Investigator:

Alton J. Reich
Project Manager

Business Contact:

Alton J. Reich
Project Manager
Small Business Information at Submission:

1109 Chesterfield Road Huntsville, AL 35803

EIN/Tax ID: 223885097
Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Research Institution Information:
Office for Sponsored Programs
Tuscaloosa, AL 35487
Contact: Marianne Woods
Contact Phone: (205) 348-5152
RI Type: Nonprofit college or university