Analysis and Resolution of Piston Pin Joint Tick Noise

2013 ◽  
Author(s):  
Chris Hall ◽  
Yu Chen ◽  
Omar Mian
Keyword(s):  
Numerical Simulation ◽  
Internal Combustion Engine ◽  
Direct Measurement ◽  
Measurement System ◽  
Combustion Engine ◽  
Hydrodynamic Lubrication ◽  
Connecting Rod ◽  
Engine Operation ◽  
Root Cause ◽  
Noise Vibration

A new measurement system and methodology has been developed which allows for direct measurement of the piston pin behavior of an internal combustion engine, particularly as it relates to pin joint ticking noise contributing to Noise Vibration and Harshness (NVH). Based on the measured dynamic of the piston pin during engine operation, the root cause of the pin joint ticking noise in this application was defined to be sticking of the pin at the end of the exhaust stroke which prevented pin lift. In order to better understand and mitigate this phenomenon, numerical simulation was conducted by means of Elasto Hydrodynamic Lubrication (EHL). The output of this simulation showed that modifying the shape of the connecting rod pin bore by ovality has a significant effect on the pin motion and pin acceleration which could eliminate the pin joint tick noise. This improved pin bore shape was tested in the engine and confirmed to eliminate the pin joint ticking noise by manipulating the pin motion and disallowing piston pin sticking. Finally, an analysis of the newly developed methodology to root cause and solve pin joint ticking is compared to the prior methodology.

Modeling the inertial torque imbalance and foundation forces within an inline internal combustion engine : quantifying the equivalent mass approximation

2018 ◽  
Author(s):  
◽  
Muslim Muhsin Ali
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Reaction Force ◽  
Internal Combustion ◽  
Significant Loss ◽  
Cylinder Wall ◽  
Connecting Rod ◽  
Piston Engine ◽  
Mass Approximation ◽  
Inertial Torque

[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] The main object of this dissertation is to study the dynamic analysis of an inline internal combustion engine. This dissertation presents the kinematics and kinetic analyses of an inline internal combustion engine crank mechanism, the dynamic torque imbalance and foundation forces for a single-piston and multi-piston engines are studied as well. The objectives of this dissertation are to explore the inertial-torque characteristics and foundation forces of an inline, internal combustion engine with connecting-rod joints that are evenly spaced about the centerline of the crankshaft, and to evaluate the goodness of a mass approximation that is customarily used in machine design textbooks. In this dissertation the number of pistons within the internal combustion engine is varied from 1 to 8. In order to generalize the results, the reaction force between the ground and the crank in the x-direction and y-direction equations are nondimensionalized and shown to depend upon only six nondimensional groups, all related to the mass and geometry properties of the connecting rod and crank while the reaction force between the connecting rod and the piston in the x-direction y-direction, reaction force between the crank and the connecting rod in the x-direction y-direction, reaction force between the piston and the cylinder wall, and the inertial-torque equations are nondimensionalized all related to the mass and geometry properties of the connecting rod. As shown in this dissertation, the largest torque imbalance is exhibited by a 2-piston engine. The next largest torque imbalance is exhibited by a 3-piston engine, followed by a single-piston engine (this is not monotonic). The largest foundation forces are exhibited by a single-piston engine. The next largest foundation forces are exhibited by a 2-piston engine, followed by a 3e-piston engine, and that a dramatic reduction in the foundation forces and torque imbalance may be obtained by using 4 or more pistons in the design, when using as many as 8 pistons the foundation forces and torque imbalance essentially vanishes. It should be observed that the mass approximation captures 100 percent of the variability of the actual torque imbalance for engines that are designed with an odd number of pistons equal to or greater than three. The mass approximation captures 100 percent of the variability of the actual reaction force between the piston and cylinder wall for engines that are designed with single-piston and multi-pistons. The mass approximation captures 100 percent of the variability of the actual reaction force against piston pin for engines that are designed with single-piston. It is also shown in this dissertation that the customary mass approximations for the connecting rod may be used to simplify the analysis for all engine designs without a significant loss of modeling accuracy.

scholarly journals Experimental and Parametric Study of Extended Fins In The Optimization of Internal Combustion Engine Cooling Using CFD

2012 ◽  
pp. 81-90
Author(s):  
J.Ajay Paul ◽  
Sagar Chavan Vijay ◽  
U. Magarajan ◽  
R.Thundil Karuppa Raj
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Internal Combustion Engine ◽  
Numerical Simulations ◽  
Parametric Study ◽  
Combustion Engine ◽  
Heat Transfer Characteristics ◽  
Engine Cooling ◽  
Fin Thickness ◽  
Annular Fins

In this experiment the single cylinder air cooled engines was assumed to be a set of annular fins mounted on a cylinder. Numerical simulations were carried out to determine the heat transfer characteristics of different fin parameters namely, number of fins, fin thickness at varying air velocities. A cylinder with a single fin mounted on it was tested experimentally. The numerical simulation of the same setup was done using CFD. The results validated with close accuracy with the experimental results. Cylinders with fins of 4 mm and 6 mm thickness were simulated for 1, 3, 4 &6 fin configurations.

Application of precision chronometric technologies for monitoring deviations in the internal combustion engine operation

2021 ◽  
Author(s):  
E.T. Plaksina ◽  
A.B. Syritsky ◽  
A.S. Komshin
Keyword(s):  
Internal Combustion Engine ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Internal Combustion ◽  
The Arctic ◽  
Diagnostic Systems ◽  
Time Intervals ◽  
Angle Sensor ◽  
Engine Operation ◽  
Working Cycle

The article considers the main methods of internal combustion engine diagnostics. A method based on measuring the time intervals between the phases of the working cycle of the mechanism is described. An algorithm for measuring the time intervals from the formulation of the problem to the proof of the efficiency of this method on an internal combustion engine has been determined. The installation of the angle sensor on the crankshaft of the experimental bench engine VAZ 21126 is shown. The basis for the construction of a mathematical model of the crankshaft is presented and the main factors influencing its movement are identified. A criterion has been established according to which the misfire is determined most accurately. The results obtained can be used for developing diagnostic systems for internal combustion engines, as well as engines operating in extreme conditions, for example, beyond the Arctic Circle, on ships, etc.

scholarly journals Analytical Approach to the Exergy Destruction and the Simple Expansion Work Potential in the Constant Internal Energy and Volume Combustion Process

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 395
Author(s):  
Jeongwoo Song ◽  
Han Ho Song
Keyword(s):  
Internal Combustion Engine ◽  
Analytical Approach ◽  
Combustion Engine ◽  
Combustion Process ◽  
Internal Combustion ◽  
Thermodynamic System ◽  
Exergy Destruction ◽  
Engine Operation ◽  
System Temperature ◽  
Simple Expansion

The exergy destruction due to the irreversibility of the combustion process has been regarded as one of the key losses of an internal combustion engine. However, there has been little discussion on the direct relationship between the exergy destruction and the work output potential of an engine. In this study, an analytical approach is applied to discuss the relationship between the exergy destruction and efficiency by assuming a simple thermodynamic system simulating an internal combustion engine operation. In this simplified configuration, the exergy destruction during the combustion process is mainly affected by the temperature, which supports well-known facts in the literature. However, regardless of this exergy destruction, the work potential in this simple engine architecture is mainly affected by the pressure during the combustion process. In other words, if these pressure conditions are the same, increasing the system temperature to reduce the exergy destruction does not lead to an increase in the expansion work; rather, it only results in an increase in the remaining exergy after expansion. In a typical internal combustion engine, temperatures before combustion timing must be increased to reduce the exergy destruction, but increasing pressure before combustion timing is a key strategy to increase efficiency.

Coupled Model of Partially Flooded Lubrication and Oil Vaporization in an Internal Combustion Engine

2005 ◽  
Author(s):  
Boon-Keat Chui ◽  
Harold J. Schock ◽  
Andrew M. Fedewa ◽  
Dan E. Richardson ◽  
Terry Shaw
Keyword(s):  
Internal Combustion Engine ◽  
Piston Ring ◽  
Fuel Injection ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Injection Timing ◽  
Oil Viscosity ◽  
Engine Operation ◽  
Extreme Stress ◽  
Compression Ring

The cylinder-kit assembly of an internal combustion engine experiences severe conditions during engine operation. The top compression ring, in particular, undergoes extreme stress directly from cylinder gas pressure, inertial and thermal loads. The top compression ring is often the most significantly affected piston ring, and one of the common resultant phenomena is high wear on the ring/bore surfaces. In many previous studies, the modeling of tribological phenomena at the top compression ring/bore region involves hydrodynamic and boundary lubrication, friction and wear. This present work accounts for an additional factor that may affect the piston ring/bore lubrication — the lubricant evaporative effect. A three-dimensional oil evaporative analysis is coupled into the calculation of mixed lubrication in a cyclic engine computation. The presence of the evaporation analysis allows the study of the temperature influence on the piston ring/bore lubrication in addition to its effect on oil viscosity. A prospective application of this model is in diesel engine analysis. Considering the broad operating range of modern diesel fuel injection systems, the injection timing can be made throughout the compression/expansion process. It is well demonstrated that certain areas of fuel injection operation can result in potential adverse consequences such as increased bore wear. A well known example is “bore wall fuel wetting.” Given concerns around the potential for wear-inducing interactions between the fuel injection plumes and the bore wall, we have explored a particular interaction: bore wear in response to an imposed local heating of the bore wall. The simulation result provides valuable insights on this interaction, in which higher bore wear is predicted around bore wall area with locally imposed wall heating.

scholarly journals A Review Article on Connective Rod

2021 ◽  
Vol 9 (VII) ◽  
pp. 1204-1208
Author(s):  
Jainil Darji
Keyword(s):  
Internal Combustion Engine ◽  
Cross Section ◽  
Rotational Motion ◽  
Combustion Engine ◽  
Review Article ◽  
Connecting Rod ◽  
Ic Engine ◽  
Vital Part ◽  
Materials Used ◽  
Reciprocating Movement

Connecting rod is the vital part of the Internal Combustion Engine (IC Engine) that connects the piston and crankshaft by means of various pins. In addition, it transmits the power and converts the reciprocating movement to the rotational motion. The present work is based on detailing the connecting rod origin to the current researches or study done on it. This paper states the different kinds of materials used to manufacture the connecting rod. Besides, the kind of failure of the connecting rod is also explained in the current work. The factor of design of connecting rod is explained using equations and cross-section. Many researchers are studying the and carrying their research on connecting rod, that is also highlighted in this article.

scholarly journals Electric vehicles diffusion: changing pavement acoustic design?

Noise Mapping ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. 281-294
Author(s):  
Filippo Giammaria Praticò ◽  
Rosario Fedele
Keyword(s):  
Internal Combustion Engine ◽  
Electric Vehicles ◽  
High Frequency ◽  
Combustion Engine ◽  
Urban Ecosystem ◽  
Low Noise ◽  
Acoustic Design ◽  
Road Pavement ◽  
Alerting System ◽  
Noise Vibration

Abstract Electric vehicles (EVs) are progressively entering into the current noisy urban ecosystem. Even though EVs are apparently quieter than traditional Internal Combustion Engine Vehicles (ICEVs), they have an impact on noise maps and road pavement designers should take this into consideration when designing future low-noise road pavements. Consequently, the main objective of this study is to define what are the most important aspects that road pavement designers should take into account. For this reason, in this paper, the noise emitted by EVs was analysed, considering parameters (e.g., speed and frequency) and comparisons, in order to identify crucial characteristics. Results show that EV noise could call for the improvement of pavement acoustic design due to the Acoustic Vehicle Alerting System (AVAS), high-frequency peaks, and noise vibration harshness.

scholarly journals The effect of air-fuel equivalence ratio change on the vibration components of an internal-combustion engine

2015 ◽  
Vol 2 (1-2.) ◽  
Author(s):  
Gabor Manhertz ◽  
Akos Antal
Keyword(s):  
Internal Combustion Engine ◽  
Measurement System ◽  
Motor Development ◽  
Equivalence Ratio ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Vibration Measurement ◽  
Time Signal ◽  
Measured Signal ◽  
Diagnostic Systems

Nowadays the automotive industry and the motor development are one of the most dynamically developing industries. One solution to the diagnostic systems providing reliability is the acoustic and vibration measurement system, which can indicate and predict a variety of malfunctions after signal processing. The purpose of this experiment is to analyze the effect of the air-fuel equivalence ratio on the vibration components of an internal-combustion engine (ICE) which is a part of the in question measurement system. In the focus of the experiments are the analysis of the time signal, its spectra, and the power content of the signal. With the increment of the air-fuel ratio the amplitudes of the measured signal and its spectral amplitudes showed a downward trend as the RMS values. In addition, certain frequency components disappeared during the actuation of the ICE with an electromotor, so the characterization of the combustion could be come to the front.

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