OVERVIEW The Theater High Altitude Area Defense (THAAD) missile system is a transportable defensive weapon that uses precision targeting to protect against hostile incoming threats such as tactical and theater ballistic missiles. BAE Systems (BAE) is responsible for providing the infrared (IR) seeker subsystem, stabilized on a two-axis integrated gimbal assembly (IGA), which is subjected to severe static, random vibration, shock, and thermal loads in operation and transportation. BAE asked ATA Engineering to analytically qualify the IGA structural design for all load cases and identify any required design modifications. A superelement analysis approach was used to balance accuracy and speed, and the system modal response was used in a forced response analysis to predict dynamic str

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