Decoupling Optimization Design of Under-Chassis Equipment Suspension System in High-Speed Trains

Table 1

Car body elastic modal frequencies (Hz).

Vibration mode	Before reduction	After reduction	Deviation (%)
First-order diamond-shaped deformation	9.70	9.66	0.41
Vertical first-order bending	11.52	11.60	0.69
First-order torsion	12.42	12.44	0.16
First-order lateral bending	14.16	14.32	1.13
First-order breathing	14.35	14.55	1.39