Evaluation of tractor driving comfort according to the steering angle and speed using a virtual prototype

Jiang, Qing Song; Ni, Weiqiang; Zhang, Xingju; Chen, Pushuang; Xu, Liangyuan; Yang, Yang

doi:10.1177/0954407020982867

Cited by 8 publications

(3 citation statements)

References 18 publications

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“…A three-dimensional solid model is created based on Pro/E software, and the mode is exported in Parasolid (*.x-t) format. Then, the model is imported into software Re curDyn, maintaining the assembly relationship and simplifying the solid model [25][26][27][28][29] As the model is simplified, the weight of the machine is quite different from the actua weight, so it is reset according to the actual weight of the machine [30].…”

Section: Creation Of Simulation Modelmentioning

confidence: 99%

Analysis and Simulation of Wheel-Track High Clearance Chassis of Rape Windrower

et al. 2022

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The middle and lower reaches of the Yangtze River are the main production area of rapeseed. Small windrowers with two tracks are adopted in this area, which have lower efficiency. With the advancement of large-scale rape planting, medium and large windrowers are urgently needed; however, most medium and large windrowers are wheeled machines which have poor adaptability to sticky soil in rice–rape rotation areas. Therefore, a wheel-track high clearance chassis for rape windrower was developed. Theoretical analysis and simulation of the main performance of this chassis were investigated. Mathematical models of the relationship between the chassis eccentricity and running resistance, uphill and downhill angle and the height of obstacle were established. Then, three-dimensional modeling and dynamic simulations of a wheel-track high clearance chassis of a rape windrower in wet clay soil were carried out based on Pro/E and RecurDyn software. The simulation results indicated that when the chassis ran on flat hard road at the same speed, eccentricity had little effect on average walking speed; the coefficient variation of speed decreased with the increase of eccentricity, while the driving torque and its coefficient variation decreased first and then increased. The minimum driving torque and the coefficient variations were obtained when the eccentricities were 1484 mm and 1584 mm. Field experiments were carried out on two kinds of ground. The results showed that on flat hard road, the speed of the wheel-track high clearance rape windrower was 0~20.22 km/h, the minimum turning radius was 5.965 m; on rice stubble field with 38.7% water content, the working speed was 0~9.12 km/h, the minimum turning radius was 6.498 m, and the climbing angle was over 20°. All parameters of the wheel-track high clearance chassis met the design specifications, and the working efficiency increased over 100% compared with the existing two-tracked rape windrower. A new kind of rape windrower for the middle and lower reaches of the Yangtze River was provided.

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Section: Creation Of Simulation Modelmentioning

confidence: 99%

Analysis and Simulation of Wheel-Track High Clearance Chassis of Rape Windrower

et al. 2022

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“…Significant increase in disc stress and peak Von-Mises stress compared to normal disc ( Li et al, 2017 ). Thus, overexposure to vibration is considered to be a major contributor to degenerative changes in the lumbar spine joints of drivers ( Bovenzi and Betta, 1994 ; Jiang et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

The impact of disc degeneration on the dynamic characteristics of the lumbar spine: a finite element analysis

Wang,

Liu,

Zhao

et al. 2024

Front. Bioeng. Biotechnol.

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The dynamics of disc degeneration was analyzed to determine the effect of disc degeneration at the L4-L5 segment on the dynamic characteristics of the total lumbar spine. A three-dimensional nonlinear finite element model of the L1-S1 normal lumbar spine was constructed and validated. This normal model was then modified to construct two degeneration models with different degrees of degeneration (mild, moderate) at the L4-L5 level. Modal analysis, harmonic response analysis, and transient dynamics analysis were performed on the total lumbar spine when experiencing following compressive loading (500 N). As the degree of disc degeneration increased, the vibration patterns corresponding to the first three orders of the model’s intrinsic frequency were basically unchanged, with the first order being in the left-right lateral bending direction, the second order being in the forward-flexion and backward-extension direction, and the third order being in the axial stretching direction. The nucleus pulposus pressure peaks corresponding to the first order intrinsic frequency for the harmonic response analysis are all on the right side of the model, with sizes of 0.053 MPa, 0.061 MPa, and 0.036 MPa, respectively; the nucleus pulposus pressure peaks corresponding to the second order intrinsic frequency are all at the rear of the model, with sizes of 0.13 MPa, 0.087 MPa, and 0.11 MPa, respectively; and the nucleus pulposus pressure peaks corresponding to the third order intrinsic frequency are all at the front of the model, with sizes of 0.19 MPa, 0.22 MPa, and 0.22 MPa, respectively. The results of the transient analysis indicated that over time, the response curves of the healthy model, the mild model, and the moderate model all exhibited cyclic response characteristics. Intervertebral disc degeneration did not adversely affect the vibration characteristics of the entire lumbar spine system. Intervertebral disc degeneration significantly altered the dynamics of the degenerative segments and their neighboring normal segments. The process of disc degeneration gradually shifted the load from the nucleus pulposus to the annulus fibrosus when the entire lumbar spine was subjected to the same vibratory environment.

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“…The level of WBV depends on vehicle speed and inclination of the steering wheel. 3 The human body may potentially be injured due to WBV and the most common effects of this vibration are low back pain, visual disability, motion sickness, nerve injury, and spinal fracture. 4 Drivers feel discomfort at low-frequency vibration, however, the appropriate seat design prevents injuries and discomfort for a short duration.…”

Section: Introductionmentioning

confidence: 99%

Development and analysis of a novel biomechanical model for seated occupants

Guruguntla

Lal

2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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Seated occupants may experience discomfort or meet with injuries if the vertical vibration frequency lies in the range of 4–20 Hz. To examine the effect of vibration on seated occupants, it is necessary to develop a biomechanical model that can precisely predict the biodynamic responses (seat to head transmissibility, driving point mechanical impedance, and apparent mass) of a real human. In the past, none of the studies segregated the human body mass into bones and muscles mass that have distinct mechanical properties. In this article, the work is carried out in four steps: first, development of a novel 8- dofs biomechanical model by considering both bone and muscle masses; second, development of all the feasible configurations of 8- dofs model followed by identification and optimization of model parameters with firefly algorithm (FA); third, calibration of all the feasible models as per the standards of biodynamics and selection of best four models; and fourth, comparison of biodynamic responses of best four models with experimental responses and past developed models. The goodness of fit of a seat to head transmissibility, driving point mechanical impedance, and apparent mass for the best model is obtained 0.986, 0.976, and 0.956, respectively.

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Evaluation of tractor driving comfort according to the steering angle and speed using a virtual prototype

Cited by 8 publications

References 18 publications

Analysis and Simulation of Wheel-Track High Clearance Chassis of Rape Windrower

Analysis and Simulation of Wheel-Track High Clearance Chassis of Rape Windrower

The impact of disc degeneration on the dynamic characteristics of the lumbar spine: a finite element analysis

Development and analysis of a novel biomechanical model for seated occupants

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