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Amphibious design of combat vehicle has become a challenging task in the context of increase in Gross Vehicle weight (GVW) of present generation combat vehicles due to demand for high protection levels and higher capacity engine and transmission, incorporation of multiple weapon systems, increased ammunition storage and larger addition of electrical and electronic items. Development of combat vehicles is complex and very expensive, and normally limited with less number of prototypes. The scale modeling and CFD analysis offers a viable solution to accomplish the amphibian design of a combat vehicle with adequate confidence before manufacturing the actual prototype. In the present work, an approach involving experimental towing test using scaled model and CFD simulation has been used to carry out the amphibious design of an 8X8, wheeled, combat vehicle with GVW of 22 ton. In this work, a 1/5thscaled model of the vehicle was manufactured and tested in the towing tank at different test speeds for drag and stability analysis. CFD analysis was carried out on the full scale model to gain adequate details about the dynamics of vehicle in the water in addition to drag estimation. Good correlation has been found in drag values and the flow patterns obtained from towing tank tests and CFD simulations.

It is required that any structure must work properly during its service life time. However, due to the internal damage of structures, there may be a chance of breakdown. Therefore, structures require regular costly inspection. During the last few decades, vibration-based fault detection methods are mostly used due to their simplicity for implementation. During operation, all structures are subjected to degenerative effects that may cause initiation of structural fault such as cracks or notch that lead to the disastrous failure or collapse of the structure. It is seen that as crack or notch starts generating, there is a change in natural frequencies. This research work focuses on the examination of these changes, which is useful for identification of notch position. In this paper, the detailed analysis of cantilever beam with and without notch has been done using finite element method with the help of ANSYS and using modern national instruments LabVIEW software. This method provides the information regarding the detection, location, and characterization of the damage in the structure. This paper includes the study of dynamic properties of cantilever beams subjected to free vibration under the influence of notch at different positions along the length.

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