Comparison of friction power loss between crankpin and crankshaft bearings on improving the engine power

Friction loss is one of the main factors affecting engine power. Reducing friction power losses to improve the power of engines is a significant concern for designers. Especially, under the background of energy-saving and emission reduction, it is indispensable to carry out an in-depth investigation on engine bearing lubrication characteristics. Unlike the previous studies of separate modelling, a new modelling method of coupling the dynamic and lubrication model is proposed in this paper. The bearing capacity, friction force, friction coefficient and eccentricity ratio were taken as the evaluation criterion, and the influence of design parameters such as angular speed, bearing radius and width on the lubrication efficiency and friction power loss (LE-FPL) were studied. The results indicate that increasing the angular speed, bearing radius or width can effectively reduce the eccentricity ratio and raise the minimum oil film thickness, which is beneficial to improve the lubrication efficiency. However, the above methods to improve engine lubrication efficiency will lead to more power loss of engine to a certain extent. Therefore, studies on reducing the friction power loss for the engine and on improving the lubrication efficiency for the engine should be considered coordinately in the dynamic design and optimisation of the engine.

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Thermoelectric performance optimization when considering engine power loss caused by back pressure applied to engine exhaust waste heat recovery

Energy ◽

10.1016/j.energy.2017.05.133 ◽

2017 ◽

Vol 133 ◽

pp. 584-592 ◽

Cited By ~ 12

Author(s):

Wei He ◽

Shixue Wang

Keyword(s):

Performance Optimization ◽

Power Loss ◽

Heat Recovery ◽

Waste Heat Recovery ◽

Waste Heat ◽

Back Pressure ◽

Thermoelectric Performance ◽

Engine Exhaust ◽

Exhaust Waste Heat ◽

Engine Power

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Analysis of Performance of Automotive Exhaust Muffler Based on ANSYS Finite Element

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.509.118 ◽

2014 ◽

Vol 509 ◽

pp. 118-122 ◽

Cited By ~ 1

Author(s):

Jian Hui Ma ◽

Peng Guo

Keyword(s):

Power Loss ◽

Simulation Analysis ◽

Low Cost ◽

Engine Exhaust ◽

Experiment Method ◽

Exhaust Noise ◽

And Performance ◽

Analysis Of Performance ◽

Performance Research ◽

Engine Power

At present, the control of the automobile engine exhaust noise is mainly installed exhaust muffler. Muffler design and performance research mainly around the silencing performance and the influence to engine power loss. This article built the 3d modeling of automobile exhaust muffler and through simulation analysis obtained the muffler internal acoustic pressure distribution and changes of insertion loss with frequency. Predict the silencer muffler performance as well as the influence on engine power loss. Provide a reference basis for the design of the silencer and optimization. Compared to the traditional experiment method, the method in this article has the advantages of short cycle, low cost.

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Reducing friction power losses of flywheel energy storage systems using PTFE composites: A technical note

Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology ◽

10.1177/1350650119836817 ◽

2019 ◽

Vol 233 (10) ◽

pp. 1616-1621

Author(s):

Shuyun Jiang ◽

Yujiang Qiu

Keyword(s):

Energy Storage ◽

Power Loss ◽

Magnetic Bearing ◽

Technical Note ◽

Flywheel Energy Storage ◽

Power Losses ◽

Spiral Groove ◽

Friction Power ◽

Ptfe Composites ◽

Spiral Groove Bearing

This technical note aims to reduce friction power loss of flywheel energy storage system (FESS) supported by hydrodynamic spiral groove bearing and permanent magnetic bearing (PMB). An approach is proposed to fabricate the spiral groove bearing using polytetrafluoroethylene (PTFE) composite. A test rig is developed to test tribological properties of the spiral groove PTFE bearings. Also, two PTFE composites (C-PTFE: 80 vol.% PTFE filled with 20 vol.% graphite; C-Cu-PTFE 50 vol.% PTFE filled with 20 vol.% graphite and 30 vol.% copper powder) are tested. Results show that the friction power losses of the C-PTFE and C-Cu-PTFE bearings are lower than that of the traditional albronze (CuAl) bearing in the whole speed range. In addition, the spiral groove PTFE bearings show an excellent friction-reducing property under boundary or mixed lubrication condition. Finally, a case study is given to show the spiral groove PTFE bearing is capable of reducing the friction power loss of the FESS.

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Design and optimization of textures on the surface of crankpin bearing to improve lubrication efficiency and friction power loss of engine

Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology ◽

10.1177/1350650120942009 ◽

2020 ◽

pp. 135065012094200

Author(s):

Zhenpeng Wu ◽

Vanliem Nguyen ◽

Vanquynh Le ◽

Xuanlong Le ◽

Vancuong Bui

Keyword(s):

Power Loss ◽

Asperity Contact ◽

Bearing Surface ◽

Film Pressure ◽

Oil Film ◽

Design And Optimization ◽

Friction Power ◽

Study Results ◽

The Impact ◽

Oil Film Pressure

The study proposes a design and optimization of textures on the surface of crankpin bearing to improve the lubrication efficiency and friction power loss (LE-FPL). A hydrodynamic lubrication model of crankpin bearing considering the impact of the external dynamic load and micro asperity contact is established. Based on the established model, the lubrication textures designed on the bearing surface are then simulated and optimized through the algorithms developed in Matlab environment and multi-objective optimization method. Increasing the oil film pressure and reducing the contact force ( Wac) in the asperity contact region, friction force ( Ff), and friction coefficient ( µ) of crankpin bearing are the objective functions to evaluate the LE-FPL. The study results indicate that the lubrication textures designed on the bearing surface have an obvious effect on improving the LE-FPL. Especially, with the optimized textures, the maximum oil film pressure is greatly increased by 44.8% while the maximum values of Wac and Ff are significantly reduced by 22% and 25%. Consequently, the lubrication textures added on the surface of crankpin bearing can greatly improve the LE-FPL.

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A Hybrid Electric Vehicle Dynamic Optimization Energy Management Strategy Based on a Compound-Structured Permanent-Magnet Motor

Energies ◽

10.3390/en11092212 ◽

2018 ◽

Vol 11 (9) ◽

pp. 2212 ◽

Cited By ~ 5

Author(s):

Qiwei Xu ◽

Yunqi Mao ◽

Meng Zhao ◽

Shumei Cui

Keyword(s):

Neural Network ◽

Permanent Magnet ◽

Energy Management ◽

Dynamic Optimization ◽

Power Loss ◽

Management Strategy ◽

Hybrid Electric Vehicle ◽

Energy Management Strategy ◽

Permanent Magnet Motor ◽

Engine Power

A dynamic optimization energy management strategy called Hybrid Electric Vehicle Based on Compound Structured Permanent-Magnet Motor (CSPM-HEV) is investigated in this paper. CSPM-HEV has obvious advantages in power density, heat dissipation efficiency, torque performance and energy transmission efficiency. This paper describes the topology and working principle of the CSPM-HEV, and analyzes its operating mode and corresponding energy flow laws. On this basis, the relationship about the power loss of the vehicle, the CSPM transmission ratio iCSPM and the CSPM-HEV power distribution coefficient f1 were derived. According to the optimal combination of (iCSPM, f1), the engine power and speed which minimize the power loss of the vehicle, were calculated, thus realizing the instantaneous optimal control of the vehicle. In addition, in order to improve the instantaneously optimized control processing speed, a neural network controller was established. The drive axle demand power, speed and battery State of Charge (SOC), were taken as input variables. Then, the engine power and speed were taken as output variables. The simulation results show that the average speed of the instantaneous optimization strategy after BP neural network optimization is increased by 98.1%, the control effect is significant, and it has high application value.

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Power Loss of Slipper within Axial Piston Pump

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.779.3 ◽

2015 ◽

Vol 779 ◽

pp. 3-12

Author(s):

Ze Bo Wang ◽

Ji Hai Jiang ◽

Yi Sun

Keyword(s):

Power Loss ◽

Friction Pair ◽

Piston Pump ◽

Axial Piston Pump ◽

Factors Affecting ◽

Friction Power ◽

Swash Plate ◽

Model Of Friction ◽

Friction Surfaces ◽

Axial Piston

The pair between slipper and swash-plate is an important friction pair in the axial piston pump. Due to quick relative velocity, alternating load, numerous slippers, and high contact pressure between the friction surfaces, the wear-out and fatigue failure constantly occurs, which is one of the key factors affecting reliability of the piston pump. It is of fundamental significance to investigate the mechanism of slipper power loss and to find an appropriate method to improve the lubrication of the slipper. Here, the model of friction power loss between slipper and swash-plate is established, and the friction power loss between slipper and swash-plate is solved and comparatively analysed. Finally, the correctness of theoretical analysis and simulation results are verified by experiments.

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Friction Power Loss of Mineral and Synthetic Lubricants in a Running Engine

10.4271/780376 ◽

1978 ◽

Cited By ~ 4

Author(s):

F. L. Badiali ◽

A. A. Cassiani Ingoni ◽

G. Pusateri

Keyword(s):

Power Loss ◽

Friction Power ◽

Synthetic Lubricants

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Power and Emission Evaluation of Natural Gas Engines Converted From Gasoline

Volume 4: Fatigue and Fracture, Heat Transfer, Internal Combustion Engines, Manufacturing, and Technology and Society ◽

10.1115/esda2006-95017 ◽

2006 ◽

Cited By ~ 1

Author(s):

Bashir Samsam Shariat

Keyword(s):

Natural Gas ◽

Power Loss ◽

Experimental Tests ◽

Open Loop ◽

Spark Ignition Engine ◽

Natural Gas Engines ◽

Before And After ◽

Mixer Design ◽

Base Engine ◽

Engine Power

In the present article, the performance analysis of a bi-fuel spark ignition engine is investigated. An originally gasoline-fuelled car is used for experimental tests. It is converted to a bifuel vehicle which may run both on natural gas and gasoline. The wheel and motor power of the car are measured before and after conversion together with exhaust emissions. It is observed that the engine power reduces not only in gas but also in gasoline state after the conversion in comparison with the base engine power. The effect of gas/air mixer design is fully explained. The results of closed-loop and open-loop gas supplying systems are compared. The influence of ignition timing on the power loss is discussed. The optimum timing advance for natural gas is obtained through laboratory experiments. The power and emissions of the converted vehicle are compared with the base power and emission values for a series of engine speeds. The reasons for the power loss are discussed and some useful methods are recommended to decrease the amount of power loss.

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Study on the Thermal Distribution Characteristics of High-Speed and Light-Load Rolling Bearing Considering Skidding

Applied Sciences ◽

10.3390/app8091593 ◽

2018 ◽

Vol 8 (9) ◽

pp. 1593 ◽

Cited By ~ 2

Author(s):

Junning Li ◽

Jiafan Xue ◽

Zhitao Ma

Keyword(s):

Temperature Distribution ◽

Power Loss ◽

High Speed ◽

Roller Bearing ◽

Transient Temperature ◽

Rolling Bearings ◽

Slip Ratio ◽

Friction Power ◽

Thermal Distribution ◽

Light Load

Skidding, which frequently occurs in high-speed rolling bearings, has a significant effect on the thermal distribution and service reliability of the bearings. An improved theoretical model of friction power loss distribution in high-speed and light-load rolling bearings (HSLLRBs) considering skidding is established, and the effects of various operating parameters on the friction power loss are investigated. The results show that the friction power loss of the inner ring and outer ring as well as the total friction power loss of the bearing increase as the slip ratio increases, but that the friction power loss of the cage guide surface and roller oil churning show a reverse trend. In addition, the increase in inner ring speed and kinematic viscosity leads to an increase in bearing friction power loss. The steady and transient temperature field distribution of HSLLRBs is obtained by the finite element method (FEM), and the results show that the inner ring raceway has the highest temperature, whereas the cage has the lowest. The temperature distribution test rig of a full-size roller bearing is constructed, and the influence mechanism of the slip ratio, rotation speed, load, lubrication, and surface topography on the bearing temperature distribution are obtained. The experimental results are consistent with the theoretical results, which also validates the theoretical method.

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