Multi-objective Optimization and Sensitivity Analysis of the Parameters Affecting Sealing Performance of the Piston Rings Face through the Validated Model for the Four-stroke Bi-fuel Engine

Document Type : Regular Article


1 Department Of Mechanical Engineering, Amirkabir University Of Technology, 424 Hafez Avenue, Po Box 15875-4413, Tehran, Iran

2 Faculty of Mechanical Engineering, Semnan University, Semnan, 35131-19111, Iran

3 Engine Labs Unit, Irankhodro Powertrain Company (IPCO), Tehran, 13988-13711 Iran



A multi-objective optimization study and sensitivity analysis of a SI engine piston-rings pack using dynamics analysis software (AVLExcite Piston&Rings) and optimizer software (modeFRONTIER) are presented. The effects of changing the piston rings' tangential force and face profile on the oil and gas flow behavior inside the piston-rings pack are investigated by calculating the lubrication oil consumption, blow-by, and power losses. The feasibility of the simulation model was determined by comparing it to empirical data obtained from experimental testing of the engine to estimate the amount of oil consumption and blow-by gas flow. Using the statistical modeling algorithm SS-ANOVA, multi-objective optimization investigates the individual and interaction effects of the three rings' tangential forces. This method significantly reduces the time and cost required to find the optimal design, an approach not reported in previous studies. The results showed a strong correlation between simulation and experimental test results, indicating an acceptable match during model validation. Furthermore, the predictions show that tangential forces affect sealing performance; thus, modifying the tangential force resulted in a 30% reduction in oil consumption and less than a 0.8 percent increase in friction. Furthermore, the LKZ oil control ring model efficiently reduces oil consumption by 25% while slightly increasing friction (about 10 percent without face coating).


Abu-Nada, E., I. Al-Hinti, A. Al-Sarkhi and B. Akash (2008). Effect of piston friction on the performance of SI engine: a new thermodynamic approach. Journal of Engineering for Gas turbines and power 130(2)##
Ahmed Ali, M. K., H. Xianjun, R. Fiifi Turkson and M. Ezzat (2016). An analytical study of tribological parameters between piston ring and cylinder liner in internal combustion engines. Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 230(4), 329-349.##
Almansoori, A. Q., A. Hajialimohammadi, S. M. Agha Mirsalim and S. Alizadehnia (2017). A novel experimental test rig for simulating of the fuel injection system components behavior under cold conditions. The Journal of Engine Research 47(47), 31-38. (Research Study)##
Bewsher, S., M. Mohammadpour, H. Rahnejat, G. Offner and O. Knaus (2019). An investigation into the oil transport and starvation of piston ring pack. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233(1), 112-124.##
Cavallaro, G., F. Demesse and P. D. Masson (2012). Internal Combustion Engine Blow-by Modeling: Importance of Thermal Environment Simulation for an Accurate Prediction SAE 2012 International Powertrains, Fuels & Lubricants Meeting No. 2012-01-1751. SAE International.##
Clarich, A., M. Carriglio, G. Bertulin and G. Pessl (2016). Connecting rod optimization integrating modeFRONTIER with FEMFAT. In: 6-th BETA CAE International Conference. https://www. beta-cae. com/events/c6pdf/12A_3_ESTECO. pdf##
Delprete, C., E. Selmani and A. Bisha (2019). Gas escape to crankcase: impact of system parameters on sealing behavior of a piston cylinder ring pack. International Journal of Energy and Environmental Engineering 10(2), 207-220.##
Di Battista, D. and R. Cipollone (2016). Experimental and numerical assessment of methods to reduce warm up time of engine lubricant oil. Applied Energy 162, 570-580.##
Dolatabadi, N., M. Forder, N. Morris, R. Rahmani, H. Rahnejat and S. Howell-Smith (2020). Influence of advanced cylinder coatings on vehicular fuel economy and emissions in piston compression ring conjunction. Applied Energy 259, 114129.##
Elsharkawy, A. A. and S. F. Alyaqout (2009). Optimum shape design for surface of a porous slider bearing lubricated with couple stress fluid. Lubrication Science 21(1), 1-12.##
Esser, J. (2002). Oil control rings and their effect on oil consumption. MTZ worldwide 63(7-8), 22-25.##
Froelund, K. and E. Yilmaz (2004). Impact of engine oil consumption on particulate emissions. In: ICAT international conference on automotive technology, Istanbul, Turkey##
Gholami, R., H. Ghaemi Kashani, M. Silani and S. Akbarzadeh (2020). Experimental and Numerical Investigation of Friction Coefficient and Wear Volume in the Mixed-Film Lubrication Regime with ZnO Nano-Particle. Journal of Applied Fluid Mechanics 13(3), 993-1001.##
GmbH, A. L. (2016a). EXCITE Piston&RingsTheory, AVL.##
GmbH, M. (2016b). Engine testing, Pistons and engine testing. Springer Fachmedien Wiesbaden, Wiesbaden. pp. 115-280.##
Gunantara, N. (2018). A review of multi-objective optimization: Methods and its applications. Cogent Engineering 5(1), 1502242.##
Iijima, N., T. Miyamoto, M. Takiguchi, R. Kai and M. Sato (2002). An experimental study on phenomena of piston ring collapse. SAE Transactions, 1019-1026.##
Jahromi, H. (2014). Sensitivity analysis of CFD method with modeFRONTIER. MS thesis, Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden.##
Jena, S. (2013). Multi-objective optimization of the design parameters of shell and tube type heat exchanger based on economic and size consideration. B.Tech. Thesis, National Institute of Technology, Rourkela.##
Kaliappan, A., S. Mohanamurugan and P. Nagarajan (2019). Numerical investigation of sinusoidal and trapezoidal piston profiles for an IC engine. Journal of Applied Fluid Mechanics 13(1), 287-298.##
Kirner, C., J. Halbhuber, B. Uhlig, A. Oliva, S. Graf and G. Wachtmeister (2016). Experimental and simulative research advances in the piston assembly of an internal combustion engine. Tribology International 99, 159-168.##
Lu, Y., C. Liu, Y. Zhang, J. Wang, K. Yao, Y. Du, and N. Müller (2018). Evaluation on the tribological performance of ring/liner system under cylinder deactivation with consideration of cylinder liner deformation and oil supply. PloS one 13(9):e0204179.##
Menacer, B. and M. Bouchetara (2020). The compression ring profile influence on hydrodynamic performance of the lubricant in diesel engine. Advances in Mechanical Engineering 12(6):1687814020930845. doi: 10.1177/1687814020930845##
Miao, R., G. Jing, X. Zeng and H. Ge (2020). Optimization of Piston-Ring System for Reducing Lube Oil Consumption by CAE Approach. 0148-7191, SAE Technical Paper.##
Mishra, P. C. and S. Kumar (2019). Modeling for design optimization of piston crown geometry through structural strength and lubrication performance correlation analysis. Frontiers in Mechanical Engineering 5:17.##
Mohiuddin, A., M. Rahman and Y. H. Shin (2011). Application of multi-objective genetic algorithm (MOGA) for design optimization of valve timing at various engine speeds. In: Advanced Materials Research 1719-1724.##
Patir, N. and H. Cheng (1979). Application of average flow model to lubrication between rough sliding surfaces. ASME Journal of Lubrication Technology April 1979 101(2), 220–229.##
Powertrain, F. M. (2010). Piston ring improves fuel economy and reduces emissions. Sealing Technology 2010(10), 2-3.##
Qian, Y., Q. Hu, Z. Li, S. Meng, K. Zhu, X. Cheng and C. Tao (2020). An experimental investigation on the evaporation characteristics of lubricating oil film in different grooves. International Communications in Heat and Mass Transfer 110, 104413.##
Rahmani, R., H. Rahnejat, B. Fitzsimons, and D. Dowson (2017). The effect of cylinder liner operating temperature on frictional loss and engine emissions in piston ring conjunction. Applied Energy 191, 568-581.##
Saligheh, A., A. Hajialimohammadi and V. Abedini (2020) Cutting forces and tool wear investigation for face milling of bimetallic composite parts made of aluminum and cast iron alloys. International Journal of Engineering 33(6), 1142-1148.##
Smith, E. H. (2011). Optimising the design of a piston-ring pack using DoE methods. Tribology international 44(1), 29-41.##
Soejima, M., Y. Harigaya, T. Hamatake and Y. Wakuri (2017). Study on Lubricating Oil Consumption from Evaporation of Oil-Film on Cylinder Wall for Diesel Engine. SAE International Journal of Fuels and Lubricants 10(2), 487-501.##
Sohrabiasl, I., M. Gorji-Bandpy, A. Hajialimohammadi and M. A. Mirsalim (2017). Effect of open cell metal porous media on evolution of high pressure diesel fuel spray. Fuel 206, 133-144.##
Tian, T., V. W. Wong and J. B. Heywood (1996). A piston ring-pack film thickness and friction model for multigrade oils and rough surfaces. SAE transactions, 1783-1795.##
Turnbull, R., N. Dolatabadi, R. Rahmani and H. Rahnejat (2020). An assessment of gas power leakage and frictional losses from the top compression ring of internal combustion engines. Tribology International 142, 105991.##
Usman, A., T. Ahmad Cheema and C. Woo Park (2015). Tribological performance evaluation and sensitivity analysis of piston ring lubricating film with deformed cylinder liner. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 229(12), 1455-1468.##
Vaghar, M. M., A. Moosavian and M. A. Ehteram (2021). An experimental and theoretical investigation on the effects of piston clearance and oil viscosity on Cranktrain friction. Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 235(6), 2230-2239.##
Venkataraman, P. (2009). Applied optimization with MATLAB programming. John Wiley & Sons.##
Zhang, Z., J. Liu, Y. Tang and X. Meng (2016). Optimizing the shape of top piston ring face using inverse method. Industrial Lubrication and Tribology.##
Volume 15, Issue 5
September and October 2022
Pages 1345-1360
  • Received: 08 January 2022
  • Revised: 27 April 2022
  • Accepted: 18 May 2022
  • First Publish Date: 26 June 2022