White Papers
Vibrating Industrial Screen Assembly, Failure Analysis and Re-design (NASTRAN-xMG Modal Frequency Analysis)
A vibrating screen utilized in the mining industry to separate various sizes of aggregate material is analyzed to determine the cause of failure experienced in operation of the unit. The screen is supported on a set of springs at each of the four corners. Motion is applied to the screen (1/2" Peak-to-Peak @ 820 RPM) in order to shake the material along and through the screen. A solution to the problem needs to be verified by analytical means.
Engine Cover Assembly Vibration, Design Verification and Re-design (NASTRAN-xMG Normal Modes Analysis)
The design of an engine cover assembly for a small internal combustion engine is required to withstand engine operating loads without exhibiting excessive vibration. Under operating conditions the small engine cover assembly is subjected to dynamic load input from engine vibration (at a dominant forcing frequency of 60 Hz). If the initial design configuration is determined to have natural vibration modes that lie near the dominant engine forcing frequency, it is likely that excess motion in the plastic portion of the cover will occur.
Patient Bed Assembly, Failure Analysis and Re-design (NASTRAN-xMG Static Analysis)
A welded leg assembly, a component of a collapsible patient bed, experienced a stress failure during testing when a static design load was applied. The response of the original design configuration to the applied test load needs to be understood so that a re-design can be implemented to achieve successful operation.
Solenoid Housing Bracket, Durability Analysis and Re-design (NASTRAN-xMG Modal Transient Response)
A solenoid housing bracket, attached at two bolting locations, is required to pass a test program where it is subjected to a dynamic load input. The test program requires the housing bracket to withstand an acceleration equivalent to 10G in each of three orthogonal directions, dwelling at each natural frequency below 1000 Hz for a period of one hour. The initial design fails in testing and must be re-designed to achieve successful completion of the test program.