Building Fragility and Vehicle Barrier Design
To protect critical nuclear structures and equipment from malevolent vehicle explosions, HEA was asked to evaluate the overpressure capacities of critical structures and equipment. A barrier system capable of stopping an assault vehicle was designed. Minimum standoff...
Finite Element Model and Modal Analysis
A spacecraft manufacturer requires a larger sized tank to accommodate increased launch vehicle payloads. HEA constructed a finite element model and a modal analysis and response spectrum analysis were performed. The new design was shown to meet minimum frequency and...
Energy Storage Unit Finite Element Model
HEA was asked to analyze this Energy Storage Unit for dynamic loads experienced during rocket launch into orbit. Our analysis revealed that ESU configuration modification was necessary to withstand the launch dynamic loads. Practical modifications were recommended to...
Finite Element Thermal Model
This is an experimental countermeasure device that is watertight and contains high energy battery and transducer electronic systems. The client was concerned that it may overheat during operation. HEA built a finite element thermal model of the electronic assembly and...
Shock and Vibration Load Analysis Model
A manufacturer had built a partial finite element model of the complex solid state transmitter assembly, but was unable to obtain useful analysis results because of the model's complexity. HEA developed an accurate and useable finite element model of the SSTx. The...
Load Transfer Vehicle Prototype
Design of a vehicle for transferring pallets and containers weighing up to 60,000 pounds to and from a supply ship via a loading ramp was required. The vehicle was to remain level and maneuverable in spite of ramp slope variations. HEA designed a prototype load...
Vehicle Barrier Analysis
Post 9-11, many facilities require vehicle barriers for additional security. HEA modeled this vehicle and barrier using LS-DYNA. We performed a full dynamic impact analysis that accurately captured energy absorption and damage. The analysis showed that the barrier...
C-130 Airborn Firefighting Thrust Design
HEA was asked to redesign a support pallet for an airborne firefighting system. The system is mounted aboard a C-130 aircraft and sprays a fire-retardant foam mixture on forest fires. The original design had proved inadequate to handle the thrust caused by the...
C-130 Paratroop Door Structural Evaluation for Firefighting Equipment Loads
Challenge: Demonstrate the structural adequacy of the C-130 aircraft paratroop door when used for firefighting missions. The outlet nozzle of the foam spray system passes through the door, causing drag force loading in combination with internal pressure and inertial...
Concrete Fragility for Aircraft Impact
Challenge: A reinforced concrete structure required evaluation for the effects of an aircraft impact. The large expected deformations and highly non-linear behavior of concrete necessitated the development of a detailed finite element model of the structure in which...