Case Studies > Mechanical
Case list
 Case 1: MEMS  Triplebeam Resonator
 Case 2: IBeam under Pressure
 Case 3: BoxBeam under Contact
 Case 4: Mechanism of Piston
Case 1: MEMS  Triplebeam Resonator
The Eigenfrequency simulation of a resonator with three beams is conducted. Two surfaces are applied with "fixed constraint". The three beam split their eigenfrequency into 6 modes.
Fig. 11 Schematic of triplebeam resonator

Fig. 12 3 outofplane modes & 3 inplane modes

Case 2: IBeam under Pressure
A Ibeam with the plasticity material model is analyzed. Because of symmetric geometry, the model is partitioned and a half is deleted. In the symmetric model, the thick wall can be considered as a rigid domain, so a further simplification can be executed by removing the thick wall domain and applying a fixed boundary condition. To use "Mirror 3D" data set, the vonMises stress distribution on the whole Ibeam can be obtained.
Fig. 21 Schematic of Ibean and simplified model

Fig. 22 Simulated results and mirrored result using a "Mirror 3D" data set

Case 3: BoxBeam under Contact
A boxbeam with the plasticity material model is analyzed. Two cylinders under the beam are fixed, and the third cylinder moves downward to compress the box. Because of symmetric geometry, a quarter of the whole model is simulated. To define finer mesh in contact areas and well predict contact interaction, the one quarter of the boxbeam is partitioned. Two defined "Mirror 3D" data sets helps mirror the simulated VonMises stress distribution on the whole model.
Fig. 31 Schematic of boxbeam and the modeling process

Fig. 32 Simulated results and mirrored result using a "Mirror 3D" data set

Case 4: Mechanism of Piston
This model is to simulate the rotation process of a piston and to verify the mechanism design using COMSOL software. The figure below on the left shows the schematic of the model including three major parts, which are connected to each other with joints. Since here joints are not our design interest, 5 Rigid connectors are used to represent joints, simplify the model and transfer the necessary constraints. The video on the right shows the simulated results. It can be seen that rigid connectors can perform quite well to represent joints in mechanism simulation.
Fig. 41 Schematic of piston and definition of rigid connectors

Fig. 42 Simulated results
