Altair India

HYPERWORKS FOR STUDENTS

Projects using Radioss

Transient Analysis Of Gun Barrel





Areas covered:

Hex mesh generation.

Direct-integration for short-time response.

Generation of plots for parametric studies.

Design interpretations of FE results.

Description of the Problem: An artillery system is being designed to allow for four barrels, and the goal is to understand the impact of the firing order on the deflection of the barrel tips. When the shell leaves a barrel, the tip of the barrel experiences a disturbance. As a result, all 4 barrel tips vibrate. If the amplitude of the vibration has not died down before the next shell is fired, accuracy will suffer. Our design problem is to estimate the amplitudes of vibration of the barrel tips under different firing orders. if we number the barrels 1-2-3-4, several choices are available to the artillery designer: the order could be 1/2/3/4, or 1/3/2/4, etc. Since the gun is still at the design stage, the load characteristics are not frozen. The simulation should also cast light on the sensitivity of the proposed configuration and firing order to the amplitude-versus-time variation of the load. A Finite Element model is used, with the direct-integration approach, to carry out the simulation. A series of analyses will be carried out to generate graphs of the displacement characteristics of the barrel-tips under different firing orders, and under different amplitude-time variations of the impulse load.

Force & Stress Analysis of Engine Mechanism





Areas covered:

Geometry Abstraction for FE modeling.

Automatic Mesh Generation.

Modeling for MBD.

Use of Component Mode Synthesis.

Description of the Problem: An assembly model for the engine of a model aircraft has been proposed. The designers want to know at what speed the engine can be run without the stress in the connecting rod exceeding the permissible stress for the material. This problem involves more than just an "FEA for stress analysis". Forces and restraints are not supplied. The designer has to estimate these and then perform the stress-analysis. The components move as a mechanism so the first task is to calculate the forces in the components as the engine reciprocates. These forces should then be used to calculate the dynamic stresses in the component of interest - the connecting rod. The first task involves a rigid-body analysis, while the second involves a flexible-body analysis. The approach taken in this assignment makes use of the capability of Radioss to mix both forms of analysis using component-mode synthesis (CMS). The assignment explores the use of "bodies" and "joints" together with "elements".

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