scholarly journals Development of a Simulation Model for HMT of a 50 kW Class Agricultural Tractor

2020 ◽  
Vol 10 (12) ◽  
pp. 4064
Author(s):  
Seung-Min Baek ◽  
Wan-Soo Kim ◽  
Yeon-Soo Kim ◽  
Seung-Yun Baek ◽  
Yong-Joo Kim
Keyword(s):  
Simulation Model ◽  
Rotational Speed ◽  
Power Transmission ◽  
Linear Regression Analysis ◽  
Simulated Data ◽  
Transmission Efficiency ◽  
Simulation Software ◽  
Range Shift ◽  
Reduction Gear ◽  
Mechanical Transmission

This study was conducted to develop a simulation model of a 50 kW class hydro mechanical transmission (HMT) tractor and to verify the model by comparing the measured and simulated data, including the axle torque, rotational speed, and power transmission efficiency. The platform of the HMT was composed of the engine, hydrostatic unit (HSU), compound planetary gear, range shift, spiral bevel gear, and final reduction gear. The HMT had three gear stages and a maximum forward speed of 40 km/h. To evaluate the performance of the HTM, a test bench was installed based on the engine of the HMT platform, and a simulation model was developed using 3D simulation software. To compare the results of the simulation, a bench test using the platform was performed according to the gear stages. The similarities between the measured and simulated data were analyzed using the t-test. As a result, there were no significant differences for the axle torque, rotational speed, and power transmission efficiency. Finally, the power transmission efficiency between the measured and simulated results was compared and analyzed using linear regression analysis to validate the accuracy of the simulation model. The trend of the power transmission efficiency between the measured and simulated results appeared to be similar in all sections, and we obtained a simulation model with the accuracy of an R-squared value of more than 0.97. In conclusion, the measured and simulated results were similar to each other. Considering the results of this study, it will be useful to develop the HMT tractor and to improve the power transmission efficiency for the optimal design.

scholarly journals Loader power-split transmission system based on a planetary gear set

2018 ◽  
Vol 10 (1) ◽  
pp. 168781401774773 ◽  
Author(s):  
Chang Lyu ◽  
Zhao Yanqing ◽  
Lyu Meng
Keyword(s):  
Output Power ◽  
Fuel Economy ◽  
Power Transmission ◽  
Planetary Gear ◽  
Torque Converter ◽  
Transmission Efficiency ◽  
Transmission System ◽  
Mechanical Transmission ◽  
Power Split ◽  
Hydraulic Torque Converter

In hydraulic mechanical transmission loaders, a hydraulic torque converter can prevent an engine from stalling due to overloading of the loader during the spading process; however, the hydraulic torque converter also reduces the loader’s fuel economy because of its low transmission efficiency. To address this issue, the study designs an output-power-split transmission system that is applied to a hybrid loader. The designed transmission system removes the hydraulic torque converter in the power transmission system of a traditional loader and adopts a planetary gear set with a compact structure as the dynamic coupling element, thus allowing the output power of the loader to be split transmitted. During shoveling, the loader power-split transmission system based on a planetary gear set can prevent the motor from plugging and over-burning under conditions that ensure that the traction does not decrease. In addition, the transmission efficiency and loader fuel economy are higher in the proposed transmission system than in the power transmission system of a traditional loader. The test results show that the transmission efficiency of the designed system was 13.2% higher than that of the traditional hydraulic mechanical transmission loader.

Research on transmission efficiency of high power hydro-viscous clutch

2019 ◽  
Vol 71 (7) ◽  
pp. 942-948
Author(s):  
Qi Sun ◽  
Fangwei Xie ◽  
Kuaidi Wan ◽  
Xinjian Guo ◽  
Jie Zhu ◽  
...  
Keyword(s):  
Rotational Speed ◽  
Power Transmission ◽  
Transmission Efficiency ◽  
Inlet Pressure ◽  
Lubricating Oil ◽  
Transmission Ratio ◽  
Content Type ◽  
Oil Film ◽  
Pressure Changes ◽  
The Relationship

Purpose The purpose of this paper is to study the influences of the oil film thickness between the friction pairs, the rotational speed of the active and passive friction disks and the inlet pressure of the lubricant on the transmission efficiency. Design/methodology/approach A mathematical model of transmission efficiency was established, and the efficiency of transmission was studied by means of numerical analysis. Findings The results demonstrate that the transmission efficiency decreases with the thickness of the oil film increases. When the thickness of oil film d = 0.1 mm, the relationship between transmission efficiency and transmission ratio is linear, that is, with the transmission ratio increases, the transmission efficiency also increases which does not change with the inlet pressure changes. However, when d = 0.1 mm, their relationship is non-linear; the efficiency increases first and then decreases as the transmission ratio increases, but decreases as the inlet pressure increases. Originality/value The authors obtained a rule is that increasing the rotational speed and reducing the inlet pressure of the lubricating oil can improve the transmission efficiency. This study can provide a theoretical basis for power transmission designing of hydro-viscous clutch.

scholarly journals Development and Verification of a Simulation Model for 120 kW Class Electric AWD (All-Wheel-Drive) Tractor during Driving Operation

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2422 ◽  
Author(s):  
Seung-Yun Baek ◽  
Yeon-Soo Kim ◽  
Wan-Soo Kim ◽  
Seung-Min Baek ◽  
Yong-Joo Kim
Keyword(s):  
Simulation Model ◽  
Power Transmission ◽  
Simulation Software ◽  
Area Network ◽  
Electric Motors ◽  
Charging System ◽  
Average Value ◽  
Wheel Drive ◽  
Significant Difference ◽  
Battery Optimization

This study was conducted to develop a simulation model of a 120 kW class electric all-wheel-drive (AWD) tractor and verify the model by comparing the measurement and simulation results. The platform was developed based on the power transmission system, including batteries, electric motors, reducers, wheels, and a charging system composed of a generator, an AC/DC converter, and chargers on each axle. The data measurement system was installed on the platform, consisting of an analog (current) and a digital part (rotational speed of electric motors and voltage and SOC (state of charge) level of batteries) by a CAN (controller area network) bus. The axle torque was calculated using the current and torque curves of the electric motor. The simulation model was developed by 1D simulation software and used axle torque and vehicle velocity data to create the simulation conditions. To compare the results of the simulation, a driving test using the platform was performed at a ground speed of 10 km/h in off- and on-road conditions. The similarities between the results were analyzed using statistical software and we found no significant difference in axle torque data. The simulation model was considered to be highly reliable given the change rate and average value of the SOC level. Using the simulation model, the workable time of driving operation was estimated to be about six hours and the workable time of plow tillage was estimated to be about 2.4 h. The results showed that the capacity of the battery is slightly low for plow tillage. However, in future studies, the electric AWD tractor performance could be improved through battery optimization through simulation under various conditions.

Research on Variable Transmission Efficiency of Automobile Transmission Based on the MASTA Software

2013 ◽  
Vol 389 ◽  
pp. 398-403
Author(s):  
Li Yun Li
Keyword(s):  
Simulation Model ◽  
Rotational Speed ◽  
Transmission Efficiency ◽  
Efficiency Increase ◽  
Variable Transmission ◽  
Simulation Results

The thesis built the simulation model of automobile variable transmission driving efficiency, and calculated the transmission efficiency by using the MASTA software under different conditions. The simulation results showed that the reverse transmission efficiency is the lowest. With gears forward 1 ~ 4, its transmission efficiency increased gradually, while the fifth gear is overdrive, therefore its transmission efficiency is lower than the fourth direct file. The transmission efficiency of the same gear increases and then decreases with the increase of the torque input. While the range of the transmission efficiency between different speed increases along with the increase of the torque. With the increase of the rotational speed of the gearbox, the transmission efficiency increase gradually, but the increase amplitude reduces gradually. The great method provides some reference for the study of the transmission efficiency.

Study on the Working Principle of a New Type of Power Transmission Mechanism for Gasoline Engine

2013 ◽  
Vol 744 ◽  
pp. 223-226
Author(s):  
Xing Quan Guan ◽  
Qiu Ping Lu ◽  
Wei Dong Liu
Keyword(s):  
Gasoline Engine ◽  
Power Transmission ◽  
Transmission Efficiency ◽  
Mechanical Transmission ◽  
Reciprocating Motion ◽  
Gear Mesh ◽  
New Type ◽  
Working Principle ◽  
Gear Rack ◽  
Rack Mechanism

This paper presents a new heat-work device, which chooses the gear-rack mechanism to realize the reciprocating motion of cylinder, and that applies swing rod rotation to transmit thermal energy, it changes the use of traditional engine crank-link mechanism and improves the mechanical transmission efficiency effectively. Using incomplete gear mesh, the length of displacement can change in the exhaust stroke, so that the combustion exhaust gas can discharge more. The premix gas is completed ahead of schedule two stroke earlier than traditional gasoline engine in the auxiliary cylinder, and mixture gas burn more thoroughly. To combine swing rod with overrunning clutch install on the output straight shaft, it can replace the crankshaft for output power.

Improving the efficiency of oilfield electric power distribution

2019 ◽  
pp. 79-87
Author(s):  
Yu. F. Yu. F. Romaniuk ◽  
О. V. Solomchak ◽  
М. V. Hlozhyk
Keyword(s):  
Power Distribution ◽  
Reactive Power ◽  
Power Transmission ◽  
Transmission Efficiency ◽  
Active Power ◽  
Oil Field ◽  
Total Power ◽  
Simultaneous Increase ◽  
Active Load ◽  
Step Down

The issues of increasing the efficiency of electricity transmission to consumers with different nature of their load are considered. The dependence of the efficiency of the electric network of the oil field, consisting of a power line and a step-down transformer, on the total load power at various ratios between the active and reactive components of the power is analyzed, and the conditions under which the maximum transmission efficiency can be ensured are determined. It is shown by examples that the power transmission efficiency depends not only on the active load, but also largely on its reactive load. In the presence of a constant reactive load and an increase in active load, the total power increases and the power transmission efficiency decreases. In the low-load mode, the schedule for changing the power transmission efficiency approaches a parabolic form, since the influence of the active load on the amount of active power loss decreases, and their value will mainly depend on reactive load, which remains unchanged. The efficiency reaches its maximum value provided that the active and reactive components of the power are equal. In the case of a different ratio between them, the efficiency decreases. With a simultaneous increase in active and reactive loads and a constant value of the power factor, the power transmission efficiency is significantly reduced due to an increase in losses. With a constant active load and an increase in reactive load, efficiency of power transmission decreases, since with an increase in reactive load, losses of active power increase, while the active power remains unchanged. The second condition, under which the line efficiency will be maximum, is full compensation of reactive power.  Therefore, in order to increase the efficiency of power transmission, it is necessary to compensate for the reactive load, which can reduce the loss of electricity and the cost of its payment and improve the quality of electricity. Other methods are also proposed to increase the efficiency of power transmission by regulating the voltage level in the power center, reducing the equivalent resistance of the line wires, optimizing the loading of the transformers of the step-down substations and ensuring the economic modes of their operation.

Compensating Resonant Frequency via Adjusting Adjustable Coil Automatically

2019 ◽  
Vol 12 (5) ◽  
pp. 432-438
Author(s):  
Jin Xu ◽  
Yuting Zhao
Keyword(s):  
Resonant Frequency ◽  
Power Transmission ◽  
Reference Value ◽  
Transmission Efficiency ◽  
Theoretical Research ◽  
Future Research ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Resonant Coupling ◽  
Transmission Distance

Background: Detuning is the main problem that affects the efficiency and transmission distance of the resonant coupling Wireless Power Transmission (WPT). The distance of load and the offset of the load position could cause serious detuning. Methods: This paper presents an adjustable coil in which inductance can be adjusted. Then a model of WPT was established that could compensate resonant frequency automatically using the adjustable coil. Next, the relationship between the primary resonant frequency and the transmission efficiency is analyzed from the circuit. The analysis proved that the design of the adjustable coil could improve the transmission efficiency of the WPT system. Finally, a prototype of WPT system was built. Results: The experimental results showed that WPT system with adjustable coil can improve the transmission efficiency which proves the theoretical research. At the same time, it has essential reference value for the future research of WPT. Conclusion: In this paper, aiming at the system detuning caused by some other factors, such as the position shift of the load during the wireless power transmission, an adjustable coil is proposed.

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