MODAL RESPONSE AND VIBRATION CHARACTERISTICS OF SUGAR BEET COMBINE HARVESTER FRAME

Meng, Jianguo; Li, Zheng; Xian, Weidong; Li, Fangxu; Li, Yanzhou

doi:10.1590/1809-4430-Eng.Agric.v44e20240054/2024

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Scientific Paper • Eng. agríc. 44 • 2024 • https://doi.org/10.1590/1809-4430-Eng.Agric.v44e20240054/2024 copy

MODAL RESPONSE AND VIBRATION CHARACTERISTICS OF SUGAR BEET COMBINE HARVESTER FRAME

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

In complex environments, beet harvesters vibrate strongly under the influence of multiple sources of excitation. The modal constraints of the harvester's frame were obtained using modal simulation, and the accuracy of the finite element model was verified through SIMO modal testing. Additionally, field experiments were conducted to collect the vibration signals of the harvester under various conditions. Time-domain analysis revealed that the RMS value of the frame's Z-axis acceleration was highest in sugar beet fields and lowest on unpaved roads. There is a correlation between the operation of working components and changes in amplitude. Frequency domain analysis determined that the main vibration frequency of the frame was in the range of 0–75 Hz, and the operating frequency of the engine (35 Hz) and the power input shaft (12.7 Hz) excites the constrained modal of the frame, which may lead to resonance. Integrating the results of the modal response and vibration testing provides a more comprehensive approach to studying the vibration characteristics of agricultural machinery.

sugar beet harvester; frame; constrained modal; various operating conditions; modal response

Density (kg/m³)	Young's modulus (GPa)	Poisson's ratio	Yield strength (MPa)
7850	210	0.3	235

Test numbers	Test conditions	Test environment	Running state	Vehicle speed (km/h)
1	Idle condition	Cement road	No load, static, engine only	0
2	Idle condition	Cement road	No load, static, all parts working	0
3	Transport condition	Unpaved road	No load, first gear, all parts working	2.1
4	Transport condition	Unpaved road	No load, second gear, all parts working	2.6
5	Transport condition	Unpaved road	No load, third gear, all parts working	3.2
6	Field condition	Sugar beet field	No load, second gear, all parts working	2.6
7	Field condition	Sugar beet field	Normal harvest, second gear, all parts working	2.6

Main excitation source	Rpm (r/min)	Vibration frequency (Hz)
Engine	2100	70
Primary driving shaft	392	6.5
Secondary driving shaft	380	6.3
Primary seedling-pulling roller	506	8.4
Secondary seedling-pulling roller	152	2.5
Power input shaft	760	12.7

Orders	Modal frequency (Hz)	Damp ratio (%)
1	9.848	0.052
2	15.694	0.150
3	22.406	2.091
4	29.993	0.682
5	35.637	0.456
6	37.245	0.219
7	39.369	0.048
8	43.494	0.147

Test point	Order	X direction		Y direction		Z direction
Test point	Order	Frequency (Hz)	Amplitude (m·s^{- 2})	Frequency (Hz)	Amplitude (m·s^{- 2})	Frequency (Hz)	Amplitude (m·s^{- 2})
1	1 2 3	12.70 17.58 57.62	1.47 0.37 0.35	12.70 70.31 35.16	1.06 0.76 0.48	11.72 35.16 3.91	0.97 0.62 0.78
2	1 2 3	12.70 35.16 25.39	0.82 0.74 0.73	12.70 25.39 70.31	0.73 0.68 0.65	70.31 68.36 25.39	1.52 1.43 1.22
3	1 2 3	70.31 75.20 35.16	1.37 1.29 0.89	12.70 70.31 75.20	1.16 0.90 0.45	70.31 75.20 66.41	0.83 0.62 0.40
4	1 2 3	12.70 78.13 31.25	0.96 0.46 0.42	35.16 11.72 75.20	0.95 0.36 0.32	12.70 36.13 38.09	1.90 0.84 0.69
5	1 2 3	35.16 12.70 92.77	0.68 0.62 0.60	11.72 75.20 35.16	0.54 0.51 0.50	12.70 48.83 10.74	1.53 0.36 0.28

Associação Brasileira de Engenharia Agrícola SBEA - Associação Brasileira de Engenharia Agrícola, Departamento de Engenharia e Ciências Exatas FCAV/UNESP, Prof. Paulo Donato Castellane, km 5, 14884.900 | Jaboticabal - SP, Tel./Fax: +55 16 3209 7619 - Jaboticabal - SP - Brazil
E-mail: revistasbea@sbea.org.br

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[1] *Corresponding author. School of Mechanical Engineering, Inner Mongolia University of Science and Technology/Baotou, China. E-mail: mjg101@163.com

Instrument name	Performance index	Parameter values
DH5902N dynamic signal acquisition instrument	Channel	16
	Sampling bandwidth	100 kHz
	Degree of distortion	<0.5%
Three-direction acceleration sensors	Range	±500
	Frequency response	0.5~7 kHz
	Lateral sensitivity	<5%
LC-04A force hammer	Range	60 kN
LC-04A force hammer	Accuracy	4 Pc/N