Vibration Analysis and Optimization of a Tracked Armored Vehicle

Background and Purpose Severity of vibrations encountered in Armored Tracked Vehicles (ATV) is comparatively much higher as compared to those in wheeled vehicles. Because ATV hull structures transmit these vibrations to various mechanically connected sub-systems, the transfer of vibrations to weapon systems through the body and mechanical components makes it difficult to control the weapon stabilization system and reduce first round hit probability on the move. This paper focuses on modal analysis of an ATV hull structure for the purpose of vibration severity identification, numerical model verification, and structural optimization by a combined experimental and numerical approach. Methods and Results ATV experimental modal analysis is performed thorough impact, rpm sweep, and continuous run tests. Acceleration data collected from the final drives in principal directions are used in developing a reliable Finite-Element Model, based on the frequency response function (FRF). Acceleration data collected at the ATV final drives in principal directions are used in computing the forces applied to the ATV drive sprocket, based on the FRF obtained by finite-element analysis (FEA) of the ATV model. These forces are then fed-back to the Finite-Element Method (FEM) model and the numerical accelerations calculated are compared with the actual test data, indicating a high level of correlation. Next, using the FEM model that accurately predicts the actual ATV structural deformations, modal analysis of a conceptual improved design structure is carried out to demonstrate how the validated numerical model may be used to obtain significant improvements in the vehicle's vibration characteristics.