scholarly journals Basic Research on Vibration and Noise of Internal Combustion Engine : 2nd Report, Noise Analysis of Cylinder Block

1984 ◽  
Vol 27 (230) ◽  
pp. 1723-1727
Author(s):  
Masaru NAGAIKE ◽  
Akio NAGAMATSU ◽  
Shohei KUMANO
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Noise Analysis ◽  
Basic Research ◽  
Internal Combustion ◽  
Cylinder Block

DEFECTIVE CYLINDER BLOCK OF INTERNAL COMBUSTION ENGINES

2021 ◽  
Vol 1 (27) ◽  
pp. 37-43
Author(s):  
A. V. Summanen ◽  
Keyword(s):  
Internal Combustion Engine ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Technical Condition ◽  
Cylinder Block ◽  
Combustion Engines ◽  
Measurement Scheme ◽  
Inner Diameter

This article discusses the issues of assessing the technical condition of the cylinder block. The necessary parameters for assessing the technical condition of the cylinder block have been determined. How and how to measure and calculate this or that parameter is presented in detail. Methods for calculating the parameters are presented. A measurement scheme and a technique for constructing a wear diagram of the inner diameter of a cylinder are proposed in order to visually assess the wear and its appearance. The method for calculating the repair size is presented. The questions of the influence of these parameters on the operability of the cylinder block and the internal combustion engine as a whole are considered.

Research on the Effect of Whole Cylinder Block on EHL Performance of Main Bearings Considering Crankshaft Deformation for Internal Combustion Engine

2010 ◽  
Vol 132 (4) ◽  
Author(s):  
Jun Sun ◽  
Xiaoxia Cai ◽  
Liping Liu
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Frictional Coefficient ◽  
Elastohydrodynamic Lubrication ◽  
Internal Combustion ◽  
Cylinder Block ◽  
Bearing Surface ◽  
Main Bearing ◽  
Compliance Matrix ◽  
Working Cycle

In this paper, the analyses of elastohydrodynamic lubrication (EHL) of crankshaft bearings considering the deformation of the whole cylinder block and crankshaft under load were carried out for the crankshaft bearing system of a four-stroke four-cylinder internal combustion engine. The lubrication of crankshaft bearing was analyzed by dynamic method. The deformation of bearing surface under pressure of oil film was calculated by compliance matrix method. The results show that when the crankshaft deformation under load is considered, compared with the results of not considering the deformation of cylinder block, the maximum film pressure decreases, the minimum film thickness increases, and the end leakage flow-rate and frictional coefficient of journal surface change little in an engine working cycle when considering the deformation of cylinder block. The models of the whole cylinder block and the single main bearing housing were used, respectively, to calculate the deformation of main bearing surface in the analyses. The results show that the calculation accuracy of the elastohydrodynamic lubrication analyses of crankshaft main bearings can be met basically by applying the simple model based on the single main bearing housing to calculate the elastic deformation of main bearing surface.

scholarly journals Operando measurement of lattice strain in internal combustion engine components by neutron diffraction

2020 ◽  
Vol 117 (52) ◽  
pp. 33061-33071
Author(s):  
Martin L. Wissink ◽  
Yan Chen ◽  
Matthew J. Frost ◽  
Scott J. Curran ◽  
Orlando Rios ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Internal Combustion Engine ◽  
Internal Combustion Engines ◽  
Lattice Strain ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Material Behavior ◽  
Cylinder Block ◽  
Transient Operation ◽  
Engine Components

Engineering neutron diffraction can nondestructively and noninvasively probe stress, strain, temperature, and phase evolutions deep within bulk materials. In this work, we demonstrate operando lattice strain measurement of internal combustion engine components by neutron diffraction. A modified commercial generator engine was mounted in the VULCAN diffractometer at the Spallation Neutron Source, and the lattice strains in both the cylinder block and head were measured under static nonfiring conditions as well as steady state and cyclic transient operation. The dynamic temporal response of the lattice strain change during transient operation was resolved in two locations by asynchronous stroboscopic neutron diffraction. We demonstrated that operando neutron measurements can allow for understanding of how materials behave throughout operational engineering devices. This study opens a pathway for the industrial and academic communities to better understand the complexities of material behavior during the operation of internal combustion engines and other real-scale devices and systems and to leverage techniques developed here for future investigations of numerous new platforms and alloys.

АКУСТИЧНА ПОМІТНІСТЬ БЕЗПІЛОТНИХ ЛІТАЛЬНИХ АПАРАТІВ З СИЛОВИМИ УСТАНОВКАМИ НА БАЗІ ПОРШНЕВИХ ДВИГУНІВ

2020 ◽  
pp. 62-80
Author(s):  
В. В. Руденко ◽  
И. В. Калужинов ◽  
Н. А. Андрущенко
Keyword(s):  
Control System ◽  
Internal Combustion Engine ◽  
Power Plants ◽  
Combustion Engine ◽  
Spectral Characteristics ◽  
Experimental Studies ◽  
Internal Combustion ◽  
Detection Range ◽  
Acoustic Signature ◽  
Static Conditions

The presence in operation of many prototypes of UAVs with propeller propellers, the use of such devices at relatively low altitudes and flight speeds makes the problem of noise reduction from UAVs urgent both from the point of view of acoustic imperceptibility and ecology.The aim of the work is to determine a set of methods that help to reduce the visibility of UAVs in the acoustic range. It is shown that the main source of noise from the UAV on the ground is the power plant, which includes the engine and the propeller. The parameters of the power plants influencing the processes that determine the acoustic signature of the UAV were investigated. A comprehensive analysis of the factors affecting visibility was carried out. The power plants include two-stroke and four-stroke engines, internal combustion and two-blade propellers. The use of silencers on the exhaust of the internal combustion engine was considered. The spectral characteristics of the acoustic fields of the propeller-driven power plants for the operating sample of the UAV "Eco" were obtained. The measurements were carried out in one-third octave and 1/48 octave frequency bands under static conditions. The venue is the KhAI airfield. Note that the propellers that were part of the power plants operated at Reynolds numbers (Re0,75<2*105), which can significantly affect its aerodynamic and acoustic characteristics. It is shown that when choosing a UAV control system, one should take into account the fact that two-stroke piston engines are the dominant source in the noise of propeller-driven control systems in the absence of a hood and mufflers in the intake and exhaust tracts. The use of a four-stroke internal combustion engine significantly reduces the noise of the control system. In the general case, the position of the boundaries of the zone of acoustic visibility of a UAV at the location of the observer is determined by the ratio between the intensity of acoustic radiation perceived by the observer from the UAV and the intensity of sound corresponding to the natural acoustic background and depends on the degree of manifestation of acoustic effects accompanying the propagation of sound in a turbulent atmosphere - the refraction of sound waves. Absorption and dissipation of acoustic energy. The calculation and comparison of the UAV detection range was carried out taking into account the existing natural maskers.The results of experimental studies are presented that allow assessing the degree of acoustic signature of the UAV. A set of measures aimed at reducing the intensity of the acoustic signature of the UAV in various regions of the radiation spectrum has been determined.

Sign in / Sign up

Export Citation Format

Share Document