ERGONOMIC DESIGN OF CAB STRUCTURE FOR WHEELED COMBINE HARVESTER

Liu, Sifan; Tang, Zhong; Zhang, Ben; Liang, Yaquan; Gu, Xinyang

doi:10.1590/1809-4430-Eng.Agric.v42n3e20220023/2022

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Scientific Paper • Eng. agríc. (Online) 42 (3) • 2022 • https://doi.org/10.1590/1809-4430-Eng.Agric.v42n3e20220023/2022 copy

ERGONOMIC DESIGN OF CAB STRUCTURE FOR WHEELED COMBINE HARVESTER

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

In view of the fact that the design of the cab structure of wheeled combine harvesters in China lacks ergonomic design parameters exclusive for Chinese drivers, there are generally problems such as high vibration and poor comfort of the whole machine structure during the harvesting process. Firstly, this paper designed the cab structure of a wheeled grain combine harvester based on ergonomics. Then, the driver's handling comfort and visibility were simulated and analyzed using Creo. Finally, the relevant dimensions of the driver's control device were optimized. The results show that the wheeled grain combine harvester cab based on ergonomic design better meets their driving comfort needs. In addition, it is found that the operating frequencies of the key components, such as the main shaft of the conveyor spindle, the vibrating screen, the threshing drum, and the intermediate shaft of the engine, partially overlap with the frequency of human discomfort. Therefore, modal planning is also needed for this harvester to meet human comfort requirements better. This paper provides the basic parameters for the design of the cab structure of the combine harvester with high comfort for the Chinese harvesting machinery driver.

KEYWORDS
Combine harvester; Ergonomics; Cab; Working parameters; Human comfort

Item content	Men (18‒60 years old)			Women (18‒55 years old)
Item content	5th percentile	50th percentile	95th percentile	5th percentile	50th percentile	95th percentile
Sitting height	858	908	958	809	855	901
Seated cervical spine point height	615	657	701	579	617	657
Sitting eye height	749	798	847	695	739	783
Sitting shoulder height	557	598	641	518	556	594
Seated elbow height	228	263	298	215	251	284
Seated thigh thickness	112	130	151	113	130	151
Seated knee height	456	493	532	424	458	493
Calf plus foot height	383	413	448	342	382	405
Sitting depth	421	457	494	401	433	469
Hip‒knee distance	515	554	595	495	529	570
Seated lower body length	921	992	1063	851	912	975
Seated hip width	295	321	355	310	344	382
Shoulder width	344	375	403	320	351	377
Sitting elbow width	371	422	489	348	404	478

Serial number	Working part name	Motion average speed (rpm)	Excitation reference frequency (Hz)	Working frequency range (Hz)
1	Crankshaft	2400.00	40.00	32.00∼40.00
2	Input shaft of gearbox	3000.00	50.00	40.00∼50.00
3	Intermediate shaft of engine	1425.00	23.75	19.00∼23.75
4	Tangential flow drum	800.00	13.33	10.67∼13.33
5	Longitudinal axial flow drum	800.00	13.33	10.67∼13.33
6	Conveyor spindle	350.00	5.83	4.67∼5.83
7	Header auger	80.00	1.33	1.06∼1.33
8	Reel	28.50	0.48	0.38∼0.48
9	Cutter	411.00	6.85	5.48∼6.85
10	Fan	1240.00	20.67	16.53∼20.67
11	Vibrating screen	411.00	6.85	5.48∼6.85
12	Horizontal auger	1024.00	17.07	13.65∼17.07
13	Vertical auger	1024.00	17.07	13.65∼17.07

Serial number	Design parts	Reference items	Corrections (mm)
1	Seat height Y₁	Calf plus foot height	Shoe height ΔL₁=30
2	Seat depth Y₂	Sitting depth	Clothes ΔL₂=12
3	Seat width Y₃	Seated hip width	Clothes ΔL₃=12
4	Backrest height Y₄	Sitting shoulder height	Clothes ΔL₄=12
5	Backrest width Y₅	Shoulder width	Clothes ΔL₅=12

Measurement item	18‒60 years old
Measurement item	5th percentile	50th percentile	95th percentile
Foot length	230	247	264
Foot width	88	96	103

Measurement item	18‒60 years old
Measurement item	5th percentile	50th percentile	95th percentile
Hand length	170	183	196
Hand width	76	82	89

Key components	Parameter	Value	Parameter	Value
Driving seat	H point coordinates	(680 mm，490 mm)	Front-to-back adjustment	156 mm
	Seat height	420 mm	Seat depth	410 mm
	Seat width	430 mm	Seat inclination angle	5°
	Backrest height	470 mm	Backrest width	420 mm
	Backrest inclination	105°
Steering wheel	Spoke shape	Three-spoke	Diameter	400 mm
Steering wheel	Cross-sectional diameter	30 mm	Angle with vertical plane	60°
Foot pedal	Type	Floor type	Pedal plane angle	30°
Foot pedal	Width	78 mm	Length	240 mm
Console	Manipulation handle	C-type handle	Handle size	110 mm×50 mm

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. Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang, 212013, Jiangsu, China. E-mail: tangzhong2012@126.com