pseudo FSAE model with inertial elements, but not the driver.
Being “softly” connected to the chassis structure, the driver is considered uncoupled from the vehicle for vibration modes high enough in frequency.
monocoque_chassis_2019_v006.mud
Loadcases
- Dynamic modal response;
- Dynamic harmonic response: vertical harmonic load at the front, right wheel, 1-100 Hz range, sampled at 0.25Hz resolution ((100-1)*4+1 = 397 steps);
MSC.Mentat procedure for creating poor man harmonic response animations
MSC.Mentat procedure for creating poor man natural mode animations
back view side view relevance of (improper) constraints on the dynamic behaviour of a structure. Design is reliable in actual operational conditions (link).
Added constraints stiffen up the structure, thus increasing natural frequencies.
However, a 0 Hz rigid body mode natural frequency may rise to a finite value due to added positioning constraints; the associate natural mode may be excited in resonance by dynamic loads.
Structural damping references
structural_damping_values_jdstevenson.pdf
damping_cross-reference_and_material_properties.pdf
f_orban_damping_of_materials_and_members_in_structures.pdf
tom_irvine_damping_in_bolted_and_welded_joints.pdf
estratto vol. 2, sezione 8 di Soovere, J., and M. L. Drake. Aerospace Structures Technology Damping Design Guide.LOCKHEED-CALIFORNIA CO BURBANK, 1985.