Case Study of Accelerated Life Test Method for Agricultural Tractor Transmission

Kim, Dae-Cheol; Kang, Young-Sun

doi:10.5307/jbe.2009.34.5.325

Cited by 8 publications

(3 citation statements)

References 2 publications

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“…In order to secure design reliability and to optimally design a tractor transmission, it is essential to evaluate its fatigue life. A conventional method for fatigue life evaluation of a tractor is an accelerated life test (ALT) [5], which is widely used as it can reduce the time required for fatigue life evaluation of a transmission. It is performed under rotational speed or torque conditions which are harsher than field conditions, in order to reduce test time [6].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Life Simulation of Tractor Spiral Bevel Gear According to Major Agricultural Operations

Kim

Baek

et al. 2020

Applied Sciences

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The spiral bevel gear in a tractor, unlike the other gears in the transmission, is one of the most vulnerable gears in terms of fatigue life, as it is consistently driven throughout the operations of the tractor. Conventional fatigue life tests of transmission gears require expensive equipment and repeated tests, and do not reflect dynamic field loads. The aim of this study is to develop a simulation model which can replace conventional fatigue life tests for actual gears, in order to evaluate the fatigue life of a tractor using dynamic field load data. A transmission simulation model including a spiral bevel gear was developed using commercial software. In order to measure the dynamic load of the tractor according to various field operations, an axle torque measurement system was developed, and field experiments were performed for major agricultural operations occurring in the field. Fatigue life was calculated using Rainflow cycle counting (RFC), the Smith–Watson–Topper (SWT) model, and S–N curves based on torque data measured in the field. The fatigue life under moldboard plow tillage, subsoiler tillage, rotary tillage, and baler operation were 13,599, 285, 278,884, and 525,977 h, respectively. The fatigue life of the tractor, according to subsoiler tillage and baler operation, was 0.104 and 192 times the service life, respectively, where the difference between these two operations was about 1846 times. The fatigue life of the tractor, according to the attached implement type, was significantly different. Therefore, it can be seen that the fatigue life of a tractor can be significantly different, depending on agricultural operation type which the farmer uses most often; this can be used as basic data for tractor design and evaluation. In addition, it is considered that the developed simulation model can be applied to fatigue life evaluation using dynamic field load data.

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Section: Introductionmentioning

confidence: 99%

Fatigue Life Simulation of Tractor Spiral Bevel Gear According to Major Agricultural Operations

Kim

Baek

et al. 2020

Applied Sciences

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“…The fatigue life obtained by applying the stress values of peaks 1 and 2 (75 MPa and 71 MPa, Figure 12) to the S-N curve correspond to 9.05x10 6 cycles and 1.50x10 7 cycles, respectively. In general, the target life of an agricultural machine is 10 years (Kim and Kang, 2009;Sim et al, 2011), and the annual usage time of a rotavator with a 37~58 kW tractor in Korea is 110 h (Kim et al, 2011). That is, the target life of the rotavator becomes 1,100 h, and this is converted to 1.07x10 7 cycles.…”

Section: Dynamic Stress Analysismentioning

confidence: 99%

Fatigue Life Prediction of Crank-type Rotavator

Kim¹,

Park

Lee

2015

Journal of Biosystems Engineering

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Purpose: This study was performed to predict the fatigue life of a crank-type rotavator operated in domestic soil conditions using Recurdyn ® , a dynamic analysis program. Methods: Torque on the PTO shaft was measured using experiments conducted on the uplands and paddy fields in Korea. On the basis of the experimental and analytical results, the fatigue life of the crank-type rotavator was predicted by constructing an S-N curve according to the GL (Germanischer Lloyd Wind Energie GmbH) guideline. Results: The torques experienced by the PTO shaft in the paddy soil and the uplands were in the range of 472~797 N․m and 313~430 N․m, respectively, for every condition. In case of load condition, the peak torques (846 N․m, 770 N․m) were applied for severe conditions, resulting in a maximum (von Mises) stress of 75 MPa at the crank arm. The fatigue life of the crank-type rotavator was predicted to be 1,167 h that satisfies the target value of 1,110 h, by substituting the analysis results into an S-N curve of crank arm. Conclusions: The fatigue life of the crank-type rotavator was within the target life for the studied soil conditions; however, further field experiments for various soil conditions would be required to verify the prediction results.

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“…는 대부분 기계 부품의 무고장 가속시험에 대해 다룬 다[3][4][5][6][7][8][9][10][11][12][13]. 한편, 항공기의 플랩구동장치 (Flap Actuation System, Fig.1)의 설계 시 항공기 경량화 Fig.…”

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No-Failure Accelerated Life Test of Flap Actuating System using Weibull Distribution

Cho¹,

Lee²,

Kim³

et al. 2016

Journal of Aerospace System Engineering

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In this paper, we present some results on No-failure accelerated life test of aerial vehicle for reliability demonstration. The design of general accelerated life test consists of the three phases: 1) Estimating normal life test time of a single product from Weibull distribution model; 2) Determining the acceleration factor (AF) by utilizing the relation between the life of mechanical components and the applied torque; 3) Calculating the accelerated life test time, which comes from dividing the estimated normal life test time into AF. Then, we applied the calculated life test time to the real reliability test of the flap actuating system, while considering the requirement specification for mechanical components and operating environment of the actuation system. Real experimental processes and results are presented to validate the theory.

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Case Study of Accelerated Life Test Method for Agricultural Tractor Transmission

Cited by 8 publications

References 2 publications

Fatigue Life Simulation of Tractor Spiral Bevel Gear According to Major Agricultural Operations

Fatigue Life Simulation of Tractor Spiral Bevel Gear According to Major Agricultural Operations

Fatigue Life Prediction of Crank-type Rotavator

No-Failure Accelerated Life Test of Flap Actuating System using Weibull Distribution

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