scholarly journals An Improved Approach to the Instantaneous IMEP Method for Piston-Ring Assembly Friction Force Measurement

1992 ◽  
Vol 35 (2) ◽  
pp. 310-318 ◽  
Author(s):  
Jeong Eui YUN ◽  
Sung Soo KIM
Keyword(s):  
Friction Force ◽  
Piston Ring ◽  
Force Measurement ◽  
Ring Assembly

Friction Force Measurements Using the Instantaneous IMEP Method and Comparison With RINGPAK Simulations

2005 ◽  
Author(s):  
Myoungjin Kim ◽  
Thomas M. Kiehne ◽  
Ronald D. Matthews
Keyword(s):  
Friction Force ◽  
Piston Ring ◽  
Cost Effective ◽  
Firing Condition ◽  
Force Measurements ◽  
Connecting Rod ◽  
Friction Forces ◽  
Bench Tests ◽  
Ring Assembly ◽  
Analysis System

Even though many researchers have measured the piston/ring assembly friction force over the last several decades, accurate measurement of the piston/ring assembly friction force is a still challenging problem. The floating liner method is not widely used, in spite of its accuracy, due to the substantial modifications required to the engine. On the other extreme, bench tests of the piston/ring assembly cannot completely simulate the real firing condition although bench tests are rapid, consistent, and cost effective. In this study, friction forces of the piston/ring assembly were measured using the instantaneous IMEP method and compared with modeling results using Ricardo’s RINGPAK software. In this research, a flexible flat cable was used to connect the connecting rod strain gage signal to the analysis system instead of using a grasshopper linkage. Therefore, the piston/ring assembly friction force was measured with the minimum change to the engine hardware.

Measurement of Piston and Piston Ring Assembly Friction Force

1985 ◽  
Author(s):  
Takaharu Goto ◽  
Shun-ichi Aoyama ◽  
Shin-ichi Nagumo ◽  
Yasuo Nakajima ◽  
Michio Onoda
Keyword(s):  
Friction Force ◽  
Piston Ring ◽  
Ring Assembly

Theoretical Modeling and Simulation of Piston Ring Assembly of an IC Engine

2004 ◽  
Author(s):  
Kishore Mistry ◽  
D. V. Bhatt ◽  
N. R. Sheth
Keyword(s):  
Friction Force ◽  
Piston Ring ◽  
Hydrodynamic Lubrication ◽  
Cylinder Liner ◽  
Lubrication System ◽  
Ic Engine ◽  
Frictional Loss ◽  
Frictional Losses ◽  
Ring Assembly ◽  
Ring Geometry

Frictional losses in an IC engine are observed between 17–19% of total induced horsepower. 35–45% frictional losses observed due to piston ring assembly only from the above-referred total frictional loss. Lubrication system is for reducing the frictional losses and under the total hydrodynamic lubrication system, if made it feasible, above referred losses can be reduced considerably. Wear normally observed at TDC and BDC during the power stroke. Experimental set-up is prepared by using used piston-cylinder assembly of an engine. Experiment methodology is adopted based on certain assumption and simulated the entire system with an extra drive system by an electric motor with a provision of various speed availability. Various pockets on cylinder liner of 2mm diameter are located on the periphery of cylinder liner to offer lubrication to the system. Care was taken to control the rate of lubrication flow with the help of control knob. Seven different profiles on piston ring were generated and measured. Friction force is calculated by power consumption measurement under different dynamic condition with a variation of 5-speed, 3- lubricants and different 8- types of piston ring geometry are experimented under different combination and results are tabulated. Graphs are plotted for friction force v/s speed for different lubricants and piston ring profiles. Effect of lubricants (SAE30, 15W40& 2T) and ring geometry are compared.

Break-In Liner Wear and Piston Ring Assembly Friction in a Spark-Ignited Engine

1998 ◽  
Vol 41 (4) ◽  
pp. 497-504 ◽  
Author(s):  
Zheng Ma ◽  
Naeim A. Henein ◽  
Walter Bryzik ◽  
John Glidewell
Keyword(s):  
Piston Ring ◽  
Ring Assembly

Analysis of Tribological Performance of Piston Ring Lubrication

2011 ◽  
Author(s):  
Yibin Guo ◽  
Wanyou Li ◽  
Dequan Zou ◽  
Xiqun Lu ◽  
Tao He
Keyword(s):  
Film Thickness ◽  
Friction Force ◽  
Power Loss ◽  
Piston Ring ◽  
Design Parameters ◽  
Oil Film ◽  
Starved Lubrication ◽  
Piston Ring Lubrication ◽  
Cylinder Bore ◽  
Lubrication Conditions

In this paper a mixed lubrication model considering lubricant supply conditions on cylinder bore has been developed for the piston ring lubrication. The numerical procedures of both fully flooded and starved lubrication were included in the model. The lubrication equations and boundary conditions at the end of strokes were discussed in detail. The effects of piston ring design parameters, such as ring face profile and ring tension, on oil film thickness, friction force and power loss under fully flooded and starved lubrication conditions due to available lubricant supply on cylinder bore were studied. The simulation results show that the oil available in the inlet region of the oil film is important to the piston ring friction power loss. With different ring face crown heights and tensions, the changes of oil film thickness and friction force were apparent under fully flooded lubrication, but almost no changes were found under starved lubrication except at the end of a stroke. In addition, the oil film thickness and friction force were affected evidently by the ring face profile offsets under both fully flooded and starved lubrication conditions, and the offset towards the combustion chamber made a large contribution to forming thicker oil film during the expansion stroke. So under different lubricant supply conditions on the cylinder bore, the ring profile and tension need to be adjusted to reduce the friction and power loss. Moreover, the effects of lubricant viscosity, surface composite roughness, and engine operating speed on friction force and power loss were also discussed.

Development of Piston Friction Force Measurement System

2002 ◽  
Vol 26 (8) ◽  
pp. 1608-1614
Author(s):  
Gyeong-Pyo Ha ◽  
Jung-Su Kim ◽  
Myeong-Rae Jo ◽  
Dae-Yun O
Keyword(s):  
Friction Force ◽  
Measurement System ◽  
Force Measurement ◽  
Force Measurement System

MEMS-Based Micro Probe Incorporating Electrostatic Actuator Towards Friction Force Microscopy With Accurate Gap Control

2018 ◽  
Author(s):  
Kenji Fukuzawa ◽  
Mikito Takahashi ◽  
Yusuke Hori ◽  
Shintaro Itoh ◽  
Hedong Zhang
Keyword(s):  
Friction Force ◽  
Force Measurement ◽  
Electrostatic Force ◽  
Sample Surface ◽  
Gap Size ◽  
Electrostatic Actuator ◽  
Friction Force Microscopy ◽  
Force Microscopy ◽  
Gap Control ◽  
Lubrication Properties

Lubrication in nanometer-sliding gaps has attracted much interest along with the advance of processing technology. To clarify the lubrication phenomena in nanometer gaps, force measurement under accurate control of the gap between the sliding probe and sample surface is needed because the lubrication properties significantly depend on the gap size. In this paper, we aimed at realizing friction force microscopes that is capable of accurate control of sliding gap. A probe with an actuator that utilizes electrostatic force was proposed and its feasibility was demonstrated.

Development of Surface Skin Friction Measurement Technique Based on Compliant Coatings

2007 ◽  
Author(s):  
Nobuyoshi Fujimatsu ◽  
Isao Misu
Keyword(s):  
Skin Friction ◽  
Friction Force ◽  
Force Measurement ◽  
A Priori ◽  
Ccd Camera ◽  
Flow Speed ◽  
Polymeric Film ◽  
Wide Range ◽  
Unsteady Characteristics

New method and means are proposed to measure the skin friction force on an aerodynamic surface based on elastic deformations of silicon rubber and gel coatings. One of characteristics is soft and easy to deform. Object is coated by elastic polymeric film with known shear modulus. Two images between wind-on and wind-off are taken using the CCD camera. The displacement of coating is calculated from the correlation of two images. There are two ways to calibrate the skin friction force to the displacement of coatings. These methods are tested and compared to quantitative skin friction force measurement. One is based on measuring the characteristics of the polymeric film using visco-elastic measurement system. This way is called as a priori calibration. The other way is accomplished from the relation between the skin friction force measured by the PHF embedded on the object and the displacement around there and is known as In-situ method. Characteristics of the coatings such as the displacement and the time response can be easily controlled by the compounding ratio of hardener. We conduct the theoretical analysis for the elastic polymer film and propose the material properties of the coatings required to measure the surface skin friction in the wide range of flow speed. The skin friction over the plate is measured using this technique in various Reynolds number. The traditional measurement using the hot wire anemometry is conducted to validate this technique. The time averaged measurements of this technique are in good agreement with the traditional results. However, the unsteady characteristics of surface skin friction are not captured by the lack of time resolution of the CCD camera.

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