Separation of the Structure Signal by the Maximal Overlap Discrete Wavelet Transform and Fast Fourier Transform
Table 2
Results of the PSD obtained in different status.
Case
Parameters of the vehicle model
Value frequencies
Noise (%)
Car
Overall dimensions: D × W × H (mm) 4,425 × 1,730 × 1,475 Overall internal dimensions: (D × W × C) (mm) 1,895 × 1,420 × 1,205 Wheelbase (mm) 2,550 Wheelbase (front/rear) 1,475/1,460
= 50 km/h
32.5 (Hz)
10
= 65 km/h
33.3 (Hz)
6.5
= 70 km/h
33.2 (Hz)
6
2.5-ton Hyundai mighty truck
Overall dimensions: D × W × H (mm) 6.715 × 2.170 × 2.355 Dimensions inside the vehicle: 4,900 × 2,050 × 380 (mm) Wheelbase: 3,735 (mm) Tread Front/rear: 1.650/1.495 (mm)
= 50 km/h
25.7 (Hz)
7
= 65 km/h
24.3 (Hz)
8
= 70 km/h
24.7 (Hz)
5
5-ton truck Hyundai
Dimensions D × W × H (mm) 6175 × 2050 × 2260 Dimensions of the vehicle D × R × C (mm) 4340 × 1920 × 390 Size of ground clearance: 220 (mm) Weight without load: 3 205 kg Gross weight: 8 440 kg Load capacity: 5 tons
= 50 km/h
12.5 (Hz)
8
= 65 km/h
11.4 (Hz)
6
= 70 km/h
11.6 (Hz)
6
20-ton truck
Iron cylinder model: ZZ1317M3861 V Full allowable load (kg): 31000 Load type (kg): 17800 Overall dimensions D × W × H (mm) 11182 × 2496 × 4735 Barrel size D × W × H (mm) 10300 × 2726 × 800 Wheelbase (mm): 1800 + 3800 + 1350 Front/rear wheel track (mm): 2022 (2041)/1830
