Piston Slap Induced Noise Simulation Considering Elasto-Hydrodynamic Contact Conditions

2001 ◽  
Author(s):  
Hans H. Priebsch ◽  
Hubert M. Herbst ◽  
Günter Offner
Keyword(s):  
Internal Combustion Engines ◽  
Friction And Wear ◽  
Theoretical Background ◽  
Combustion Engines ◽  
Contact Conditions ◽  
Noise Simulation ◽  
Engine Design ◽  
Joint Forces ◽  
Transfer Behavior ◽  
Design Result

Abstract Main aims in the development process for the cylinder assembly of internal combustion engines are the reduction of friction and wear due to the contact between piston and liner as well as the minimization of piston slap induced noise. In this paper, the authors extend their methodology for the simulation of structural dynamics in the area of piston and liner with the aim of predicting structure borne noise excited by the piston slap phenomenon. The simulation model uses linear, flexible bodies subjected to highly non-linear joint forces, as occurring in the piston-to-liner contact. Both, the theoretical background and the advantages of the coupled simulation procedure for such complex systems are discussed. The models are validated by comparison of measured and computed values of piston movements and modal structure behavior. The result examples focus on the effects of piston secondary movement, the resulting impact on the lubricated liner and the analysis of vibration transfer behavior in the block structure. It is shown how noise excitation and structure borne vibration transfer paths can be analyzed in order to assess engine design. Result plots show typical results on the surface of a 4 Cylinder Diesel engine and the contribution of piston slap induced noise.

A Three-Dimensional Analysis of Piston Ring Lubrication Part 1: Modelling

1995 ◽  
Vol 209 (1) ◽  
pp. 1-14 ◽  
Author(s):  
M-T Ma ◽  
E H Smith ◽  
I Sherrington
Keyword(s):  
Internal Combustion Engines ◽  
Piston Ring ◽  
Three Dimensional ◽  
Combustion Engines ◽  
Three Dimensional Model ◽  
Engine Design ◽  
Piston Ring Lubrication ◽  
Almost All ◽  
Theoretical Analyses ◽  
Lubrication Conditions

The study of piston ring lubrication in internal combustion engines has remained a very active area in tribology. Theoretical analyses have been developed by many researchers to predict the performance characteristics of piston rings, but almost all previous models established were based upon the assumption that ring/cylinder geometry was axisymmetric. This may not be adequate for modern-day engine design since it is well known that cylinder bores are not perfectly circular. They suffer radial distortions which arise for various reasons. In the current work, a three-dimensional model has been developed to account for the effects of bore out-of-roundness. In order to do this, the three-dimensional Reynolds equation was solved cyclically using the finite difference method in fully flooded lubrication conditions. In this part of the paper, the theoretical model is presented and the effect of bore shape on piston ring performance is examined with three proposed types of bore (circular, elliptical and four-lobe). The results have shown that piston ring performance is significantly dependent on the bore shape or bore out-of-roundness.

scholarly journals Surface Texture Influences on the Running-in Behavior and Friction Reduction

2018 ◽  
Vol 159 ◽  
pp. 02017
Author(s):  
Zhouyong Hou ◽  
Tomomi Honda
Keyword(s):  
Surface Texture ◽  
Internal Combustion Engines ◽  
Friction And Wear ◽  
Fuel Efficiency ◽  
Surface Profile ◽  
Friction Reduction ◽  
Profile Measurement ◽  
Textured Surface ◽  
Combustion Engines ◽  
Textured Surfaces

For improving automobile fuel efficiency, the internal combustion engines must be required to reduce the friction and wear. Changing viscosity of lubricant and surface pressure could succeed, but the seizure is easy to happen in engines. However, the surface texture can solve those problems. The running-in behavior affects friction and wear on whole combustion engines. If the running-in is not carefully designed, catastrophic accident can happen. This experiment investigates that the running-in behavior is influenced by textured surfaces and the tested materials are the cast iron and the different area ratio of dimple of aluminum alloy combination. The friction coefficient and the number and size of wear particles are measured by the friction sensor and particle counter. After the tests, the worn surfaces are measured through using surface profile measurement systems, and some significant phenomena are observed and analyzed. The textured surface verifies good consequence and tribological advantages.

A comprehensive overview of hydrogen engine design features

2007 ◽  
Vol 221 (8) ◽  
pp. 911-920 ◽  
Author(s):  
S Verhelst ◽  
S Verstraeten ◽  
R Sierens
Keyword(s):  
Internal Combustion Engines ◽  
Control Strategies ◽  
Experimental Studies ◽  
Internal Combustion ◽  
Transport Sector ◽  
Special Focus ◽  
Combustion Engines ◽  
Design Features ◽  
Comprehensive Overview ◽  
Engine Design

Realizing decreased CO2 emissions from the transport sector will be possible in the near future when substituting (part of) the currently used hydrocarbon-fuelled internal combustion engines (ICEs) with hydrogen-fuelled ICEs. Hydrogen-fuelled ICEs have advanced to such a stage that, from the engine point of view, there are no major obstacles to doing this. The present paper indicates the advantages of hydrogen as a fuel for spark ignition (SI) internal combustion engines. It also shows how the hydrogen engine has matured. An extensive overview is given of the literature on experimental studies of abnormal combustion phenomena, mixture formation techniques, and load control strategies for hydrogen-fuelled engines. The Transport Technology research group of the Department of Flow, Heat and Combustion Mechanics at Ghent University has been working on the development and optimization of hydrogen engines for 15 years. An overview of the most important experimental results is presented with special focus on the most recent findings. The article concludes with a list of engine design features of dedicated hydrogen SI engines.

COSRING-LUJET, Integrated New Concept in Automotive I.C. Engines for a Better Lubrication

2014 ◽  
Vol 659 ◽  
pp. 231-236
Author(s):  
Edward Rakosi ◽  
Gheorghe Manolache ◽  
Sorinel Gicu Talif ◽  
Dan Teodor Balanescu
Keyword(s):  
Internal Combustion Engines ◽  
Combustion Engines ◽  
Contact Conditions ◽  
Original Solution ◽  
Factors Affecting ◽  
Lubrication Regime ◽  
Cam Follower ◽  
Peripheral Surface ◽  
Wear Reduction ◽  
Engine Life

The COSRING-LUJET is a new concept for integrated solution to improve the lubrication regime in internal combustion engines. Introducing a conical shape for the peripheral surface of the rings, the authors analyze the conditions for the lubrication regime. Under this new concept, entitled COSRING, has developed a method for determining the transversal profile of the first and the second compression ring in order to obtain a better lubrication conditions for the piston ring – cylinder line assembly. On the other hand, the authors analyze the main factors affecting the cam-follower contact conditions, emphasizing the influence of the lubrication regime conditions over the couple wear reduction. The LUJET concept, proposed and studied by the authors, is an original solution for the improvement of the lubrication regime and engine life by using additional oil jets directed over the contact area.

Thermal Analysis of Radiator Core in Heavy Duty Automobile

2008 ◽  
Author(s):  
Srikanth Kolachalama ◽  
Kalyan Kuppa ◽  
Dhananjay Mattam ◽  
Mukul Shukla
Keyword(s):  
Internal Combustion Engines ◽  
Heat Dissipation ◽  
Cooling System ◽  
Engine Performance ◽  
Mathematical Expression ◽  
Helical Structure ◽  
Design Parameters ◽  
Combustion Engines ◽  
Engine Design ◽  
Coefficient Of Thermal Conductivity

Background: Heat dissipation is one of the most critical considerations in engine design and with an efficient cooling system; performance of the engine can be dramatically improved. All internal combustion engines convert chemical energy into mechanical power. Around 70% of the energy is converted into heat and therefore, the primary job of the cooling system is to keep the engine from overheating by transferring this heat to the air. A radiator transfer’s heat from the hot coolant to the air and an effective design of radiator will ultimately lead to enhanced engine performance by reducing the heating effect. Methods and results: A mathematical expression for the rate of heat dissipation from the radiator core was derived and a modification in the design was proposed in the radiator core by changing the structure of the tubes from cylindrical to helical. The rate of heat dissipation for both designs was compared with similar boundary conditions by varying the magnitude of all design parameters in a specific range that have same magnitude of area of cross section, length of the radiator core and coefficient of thermal conductivity for the tube. Enhanced rate of heat dissipation for helical structure confirms the efficacy of the proposed design.

scholarly journals Quality increase in surface layer of working cylinder face of reciprocating internal combustion engines (ICE)

2016 ◽  
Vol 1 (6) ◽  
pp. 7-11
Author(s):  
Алексей Проватар ◽  
Aleksey Provatar ◽  
Александр Дорохов ◽  
Aleksandr Dorokhov ◽  
Юрий Матвеев ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Surface Layer ◽  
Internal Combustion Engines ◽  
Friction And Wear ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Convex Polyhedral ◽  
The Creation ◽  
New Feature

The purpose of this investigation is the problem consideration in the creation in a surface layer of the working cylinder face a structure ensuring antiwear and anti-friction properties. The discovery of new carbon forms – fullerenes and the study of their properties gave a direction in the development of micro-mechanics of friction and wear on the basis of the formation new surface layer properties in friction pairs by means of the saturation its crystal structure with convex polyhedral molecules of fullerenes, mainly C60 and C70. In such cases the most acceptable coating techniques will be, for example, technologies of cylinder nonabrasive honing (charging) for internal combustion engines (ICE). A significant and new feature in this direction is aimed in this case to introduce fullerenes by means of their diffusion into a lattice of a surface layer in a part subjected to friction and wear.

scholarly journals A review of split-cycle engines

2018 ◽  
Vol 21 (6) ◽  
pp. 897-914 ◽  
Author(s):  
Joshua Finneran ◽  
Colin P Garner ◽  
Michael Bassett ◽  
Jonathan Hall
Keyword(s):  
Thermal Management ◽  
Thermal Efficiency ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Engine Design ◽  
Work Assessment ◽  
In Series ◽  
Management Issues

This article reviews split-cycle internal combustion engine designs. The review includes historical work, assessment of prototypes and discussion of the most recent designs. There has been an abundance of split-cycle engine designs proposed since the first in 1872. Despite this, very few prototypes exist, and no split-cycle engines are reported to be in series production. The few split-cycle prototypes that have been developed have faced practical challenges contributing to limited performance. These challenges include air flow restrictions into the expansion cylinder, late combustion, thermal management issues, and mechanical challenges with the crossover valve actuation mechanism. The main promoted advantage of split-cycle engines is the increased thermal efficiency compared to conventional internal combustion engines. However, an efficiency improvement has not thus far been demonstrated in published test data. The thermodynamic studies reviewed suggest that split-cycle engines should be more efficient than conventional four-stroke engines. Reasons why increased thermal efficiency is not realised in practice could be due to practical compromises, or due to inherent architectural split-cycle engine design limitations. It was found that the number of split-cycle engine patents has increased significantly over recent years, suggesting an increased commercial interest in the concept since the possibility of increased efficiency becomes more desirable and might outweigh the drawbacks of practical challenges.

Aircraft and Motor Car Engine Design: Contrasted from the Standpoint of a Designer and Manufacturer of Both Types

1917 ◽  
Vol 21 (83) ◽  
pp. 313-332
Author(s):  
Louis Coatalen
Keyword(s):  
Great Britain ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Engine Design ◽  
The World

In addressing myself to the members of the Aeronautical Society of Great: Britain, the oldest institution of its kind in the world, I have to bear in mind that a section only of that membership is composed of designers of internal combustion engines. Therefore I have striven to make my remarks this evening as intelligible as possible to those who have not had such training.

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