Altair India

HYPERWORKS FOR STUDENTS

Projects using Radioss

FRF Analysis of a Cross Member





Areas covered:

Geometry abstraction for FE modeling.

Automatic mesh generation.

Application of FRF loads.

Design interpretations of FE results.

Geometry abstraction for FE modeling.

Description of the Problem: Vibration response plays an important part in the design of vehicle frames. The range of excitation is usually specified by the vehicle designer for each sub-system. In this project, a cross-member has been proposed for a vehicle chassis. The purpose of the analysis is to evaluate the response of the component as the frequency is "swept" through the given range - from 0 to 1000 Hz. The starting point of the problem is the IGES file of the CAD assembly. A frequency-domain load is applied to simulate a frequency-sweep: from 0 to 1000 Hz. The student should be encouraged to understand the modal-testing approach so that the importance of the various data is understood from a designer's perspective. The vibration characteristics of the assembled frame will be very different from that of the single component, of course, but the approach of setting requirements on individual components is essential at the preliminary design stage.

Thermal Expansion Of Screw Shaft





Areas covered:

Geometry abstraction for FE modeling.

Hex mesh generation.

Application of Temperature loads.

Use of symmetry boundary conditions.

Use of contact in FE analysis.

Design interpretations of FE results.

Description of the Problem: Aircraft components go through stringent testing before they are accepted. The testing conditions are often more demanding than the anticipated deployment conditions. A design proposal has been received for a subassembly, and the task is to simulate its performance. The screw-shaft subassembly, which fits into a housing, is manufactured to very close tolerances. The dimensional accuracy is measured in 10s of microns. In the test chamber, the complete assembly is cooled to -40 degrees Kelvin and tested. It is subsequently raised to 135 degrees Kelvin and tested again. Will the sub-assembly function correctly? How will the gap in the groove behave? Since the entire assembly is "soaked" in the testing-chamber to reach the uniform temperature, we do not need to perform a thermal analysis. Instead, we need to apply the temperature field and calculate the deformation of the components. In case there is interference, we can then use contact analysis to investigate stresses.

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