Research on Multiobjective Topology Optimization of Diesel Engine Cylinder Block Based on Analytic Hierarchy Process

Table 5

The top 6-order natural frequencies and vibration modes.

Orders	Frequency	Vibration mode
1	264Hz	First-order torsional vibration around the X axis
2	493 Hz	First-order bending vibration around the Z axis
3	531 Hz	Second-order torsional vibration around the X axis
4	562 Hz	The skirt vibrates with torsion along the X direction
5	778 Hz	Whole bending torsional vibration
6	1038 Hz	Whole torsional vibrating around the X axis