Application of DC Electric Dynamometer in the PTO Power Test of Tractors

Wang, Jiankang; Wu, Mao; Jiang, Ping; Sun, Songlin; Xie, Fangping

doi:10.1109/icicta.2011.300

Cited by 3 publications

(3 citation statements)

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“…Then standards can be easily converted directly to the torque by using tabulated vales and observed values. Jiankang et al (2011) investigated the engine testing bench and the effect of DC electric dynamometer used in PTO power test (Figure 1). To achieve automatic control and automatic recording, they found the system greatly reduced the labor intensity of testing personnel and the human error in the testing process, but also Figure 1.…”

Section: Pto Power and Their Protectionmentioning

confidence: 99%

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Research Trends for Performance, Safety, and Comfort Evaluation of Agricultural Tractors: A Review

Kabir¹,

Ryu²,

Chung³

et al. 2014

Journal of Biosystems Engineering

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Background: Significant technological development and changes happened in the tractor industries. Contrariwise, the test procedures of the major standard development organizations (SDO's) remained unchanged or with a little modification over the years, demanding new tractor test standards or improvement of existing ones for tractor performance, safety, and comfort. Purpose: This study focuses on reviewing the research trends regarding performance, safety and comfort evaluation of agricultural tractors. Based on this review, few recommendations were proposed to revise or improve the current test standards. Review: Tractor power take-off power test using the DC electric dynamometer reduced human error in the testing process and increased the accuracy of the test results. GPS signals were used to determine acceleration and converted into torque. High capacity double extended octagonal ring dynamometer has been designed to measure drawbar forces. Numerical optimization methodology has been used to design three-point hitch. Numerous technologies, driving strategies, and transmission characteristics are being considered for reducing emissions of gaseous and particulate pollutants. Engine emission control technology standards need to be revised to meet the exhaust regulations for agricultural tractors. Finite Element Analysis (FEA) program has been used to design Roll-Over Protective Structures (ROPS). Program and methodology has been presented for testing tractor brake systems. Whole-body vibration emission levels have been found to be very dependent upon the nature of field operation performed, and the test track techniques required development/adaptation to improve their suitability during standardized assessment. Emphasizes should be given to improve visibility and thermal environment inside the cab for tractor operator. Tractors need to be evaluated under electromagnetic compatibility test conditions due to large growing of electronic devices. Research trends reviewed in this paper can be considered for possible revision or improvement of tractor performance, safety, and comfort test standards.

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Section: Pto Power and Their Protectionmentioning

confidence: 99%

“…To achieve automatic control and automatic recording, they found the system greatly reduced the labor intensity of testing personnel and the human error in the testing process, but also Figure 1. Schematic diagram of structure about the test bench (Jiankang et al, 2011).…”

Section: Pto Power and Their Protectionmentioning

confidence: 99%

Research Trends for Performance, Safety, and Comfort Evaluation of Agricultural Tractors: A Review

Kabir¹,

Ryu²,

Chung³

et al. 2014

Journal of Biosystems Engineering

View full text Add to dashboard Cite

show abstract

“…Data analysis showed that the torque values for the three tractors varied directly proportional to the increase in the PTO load steps. Jiankang et al (2011) used a direct current electric dynamometer to determine performance of a tractor PTO. De Farias et al (2017) obtained the values for the torque and effective power of a tractor by using electric parasitic current (Foucault currents) dynamometric brakes.…”

Section: Introductionmentioning

confidence: 99%

A Stationery Loading Unit for Measuring Farm Tractors Power in PTO

Minyawi

2017

Journal of Soil Sciences and Agricultural Engineering

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The torque and power of a tractor are two important decision making factors when buying an agricultural tractor. These factors are generally extracted through PTO tractor testing. Such testing is accomplished using a device called dynamometer. Since commercial dynamometers are expensive, research efforts are encouraged to develop similar dynamometer for tractor tests. The aim of this study was to fabricate and adapt an automobile brake system to become a PTO shaft brake loading system for measuring torque and power. A commercial torque transducer was fixed to the tractor PTO for both toque and rotational speed measurements. Tests were performed on a Helwan 35 IMT tractor with 26.12 kW of power. The laboratory demonstration test showed that the measurement of torque magnitude at PTO of the tractor was satisfactory. The results were compared to those obtained through loading the same tractor with a shop AW commercial dynamometer and the relative error between the data sets was-2.59%. A t-test showed no significant differences in the averages of power. Considering the results of this study, the PTO shaft brake loading system can feasibly applied to tractor performance evaluation.

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Research on Loading Method of Tractor PTO Based on Dynamic Load Spectrum

Wang

Jian-hua

et al. 2021

Agriculture

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The torque load spectrum is an important basis for the strength design and durability test verification of tractor power take-off (PTO), and the performance and reliability of tractor PTO directly affect the quality and efficiency of agricultural operations. In this paper, taking the PTO torque load as the object, a PTO loading method based on the dynamic load spectrum acquired in the actual field work was proposed in this paper. Based on the Peak Over Threshold model, the extrapolation of the PTO load spectrum was realized, and the load spectrum throughout the whole life cycle was obtained. On the basis of this, the mobile tractor PTO loading test bench and Fuzzy-Proportional-Integral-Derivative (Fuzzy-PID) controller were developed to achieve the dynamic loading of the PTO load spectrum, and the dynamic characteristics were analyzed and verified by the simulation and laboratory test. The results showed that with the time domain extrapolation method, the load extreme value was expanded from (63.24, 469.50) to (60.88, 475.18), and the coverage was expanded by 1.98%. By comparing with the fitting results, statistical characteristics and rain flow counting results, the load spectrum extrapolation method was effective. In addition, the response time of simulation and laboratory test were 0.05s and 0.75s, respectively; the maximum error was 1.77% and 4.03%, respectively; and the goodness of fit was 16.78 N·m, which indicated that the PTO loading test bench, can accurately restore the dynamic loading of the tractor and the Fuzzy-PID controller had better accuracy and stability. It would provide a reference for the practical application of PTO load spectrum of the tractors.

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Application of DC Electric Dynamometer in the PTO Power Test of Tractors

Cited by 3 publications

References 0 publications

Research Trends for Performance, Safety, and Comfort Evaluation of Agricultural Tractors: A Review

Research Trends for Performance, Safety, and Comfort Evaluation of Agricultural Tractors: A Review

A Stationery Loading Unit for Measuring Farm Tractors Power in PTO

Research on Loading Method of Tractor PTO Based on Dynamic Load Spectrum

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