scholarly journals Camshaft Loosening Diagnosis on the Basis of Generalised Force Recognition at the Centre of Gravity of an Engine

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Chuanyan Xu ◽  
Lixue Meng ◽  
Ruyan Gong ◽  
Xun Gong ◽  
Aijuan Li
Keyword(s):  
Cylinder Head ◽  
Combustion Engine ◽  
Working Process ◽  
Valve Mechanism ◽  
Novel Technique ◽  
Centre Of Gravity ◽  
Engine Cylinder ◽  
Discrete Spectra ◽  
Acceleration Signals

A valve mechanism supports the working process of an engine cylinder, and a camshaft is a key component required to open and close a valve. When a camshaft loosens, the balance of the engine disrupts. In the meanwhile, the generalised force at its centre of gravity (CG) alters. This study proposed a novel technique to detect camshaft loosening based on recognising the generalised force at the CG of the engine. We conducted Hanning windowed interpolation of discrete spectra to extract the precise phase and amplitude by utilising the acceleration signals at the engine cylinder and mounts and cylinder head. We then accurately computed the generalised force at the CG. Finally, we accurately extracted the camshaft loosening features by analysing the main harmonic orders for the generalised force. As indicated by simulations, our method can be used to effectively detect combustion engine faults involving camshaft loosening.

Metal Transfer from Piston Rings to Cylinders during “Run-in”

1949 ◽  
Vol 3 (1) ◽  
pp. 169-175
Author(s):  
C. D. Strang ◽  
J. T. Burwell
Keyword(s):  
Internal Combustion Engine ◽  
Cylinder Head ◽  
Piston Ring ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Cylinder Wall ◽  
Piston Rings ◽  
Engine Operation ◽  
Small Water ◽  
Engine Cylinder

Piston rings with radio-active wearing-surfaces were used to study the micro-welding between rings and cylinder wall during “run-in” in a small, water-cooled, internal combustion engine. The results indicated that micro-welding and the accompanying transfer of metal were present under the mildest conditions of engine operation, including motoring with the engine cylinder-head removed. The distribution of micro-welding along the ring-travel was found to correspond to the wear profile observed in engine cylinders by other workers. Such transferred material may play a part in the formation of the “glazed” layer which is said to be present on “run-in” cylinder walls and rings. The presence of transferred metal at all points along the ring-travel indicates that the piston ring was not fully supported by a hydrodynamic oil film of sufficient thickness to separate completely the surfaces of the ring and the cylinder wall.

Temperature Field Analysis of High-Speed Gasoline Engine Cylinder Head Based on Fluid-Solid Coupling

2013 ◽  
Vol 680 ◽  
pp. 327-332
Author(s):  
Yong Shuai Wang ◽  
Jing Yang ◽  
Xiang Jun Yu ◽  
Ke Li
Keyword(s):  
Cylinder Head ◽  
High Speed ◽  
Gasoline Engine ◽  
Cooling System ◽  
Combustion Engine ◽  
Cooling Water ◽  
Field Analysis ◽  
Temperature Fields ◽  
Water Jacket ◽  
Engine Cylinder

As the important part of the internal-combustion engine, cylinder head bears high thermal loads and mechanical loads. In order to analyse the merits or defects of cylinder head cooling system , built the 3-D model of cylinder head, and analysed the heat transfer processes between cylinder head and cooling water by fluid-solid coupled simulation in STAR-CCM+. The pressure nephograms and velocity vector of cooling water in the water jacket, and the whole temperature distributions of cylinder head were acquired. And analysed separately the temperature fields of fire power faces and exhaust passages which were under high heat loads .According to the analysis results , the structrue of cylinder head water jacket was evaluated and corresponding suggestions was put forward.

Flow in the coolant passages of an internal combustion engine cylinder head

1990 ◽  
Vol 10 (1) ◽  
pp. 50-54 ◽  
Author(s):  
C. H. Liu ◽  
C. Vafidis ◽  
J. H. Whitelaw ◽  
R. Margary
Keyword(s):  
Internal Combustion Engine ◽  
Cylinder Head ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Engine Cylinder

scholarly journals Non-Standard T6 Heat Treatment of the Casting of the Combustion Engine Cylinder Head

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4114
Author(s):  
Jacek Pezda ◽  
Jan Jezierski
Keyword(s):  
Heat Treatment ◽  
Cylinder Head ◽  
Combustion Engine ◽  
Eutectic Silicon ◽  
Production Capacity ◽  
Optimal Process ◽  
Passenger Cars ◽  
T6 Heat Treatment ◽  
Engine Cylinder ◽  
Material Hardness

The introduction of new design solutions of cast components to the powertrain systems of passenger cars has resulted in an increased demand for optimization of mechanical properties obtained during heat treatment, assuring—at the same time—a suitable level of production capacity and limitation of manufacturing costs. In this paper, research results concerning non-standard T6 heat treatment of a combustion engine cylinder head made of AlSi7Cu3Mg alloy are presented. It has been confirmed that the optimal process of heat treatment of this component, taking into consideration the criterion of material hardness, involves solutioning at a temperature of 500 °C for 1 h, and then aging for 2 h at 175 °C. As a result, HBS10/1000/30 hardness in the range of 105–130 was obtained, which means an increase from 35% to 60% in comparison to the as-cast, depending on the position of the measurement and spheroidization of precipitations of eutectic silicon.

Numerical study of fluid dynamic flow within an internal combustion engine cylinder

2017 ◽  
Author(s):  
Ana Marta Souza ◽  
Antônio César Valadares de Oliveira ◽  
Enrico Temporim Ribeiro ◽  
Francisco Souza ◽  
Marcelo Colombo Chiari
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Numerical Study ◽  
Fluid Dynamic ◽  
Internal Combustion ◽  
Dynamic Flow ◽  
Engine Cylinder

Development of Surface Welding Method for Surface Temperature Measurement of an IC Engine's Combustion Chamber

2006 ◽  
Vol 306-308 ◽  
pp. 453-458
Author(s):  
Hyung Man Kim ◽  
Kap Seung Choi ◽  
Chang Ho Kim ◽  
Dong Jae Lee
Keyword(s):  
Temperature Measurement ◽  
Combustion Engine ◽  
Marine Engine ◽  
Combustion Gas ◽  
Welding Method ◽  
Pull Out ◽  
Engine Cylinder ◽  
Temperature Combustion ◽  
Surface Welding ◽  
High Temperature Combustion

In the recent development of internal combustion engine, considerable increase in speed and power has been accomplished. This achievement, however, brought up various problems due to the excessive temperature of engine parts, which becomes a crucial factor in engine durability. In the present paper, temperature measurement of a marine engine was investigated experimentally. The adapter is made to pull out a thermocouple through the safety valve hole of the engine. The thermocouple is welded on the surface of the cylinder cover to measure the average temperatures of the engine cylinder cover. Ceramic adhesive was used for preventing the affect of high temperature combustion gas. The cylinder cover temperatures of the engine were measured by means of surface welding method. As a result, average temperatures of the engine cylinder cover were successfully in the range of 85~335oC. In the present study, the surface welding method was confirmed from the temperature measurement of cylinder cover in an experimental engine, and can be applied to large-sized marine engine without damage.

Measurement Scheme Synthesis in Multi-Station Machining Systems

Manufacturing ◽  
2002 ◽  
Author(s):  
Dragan Djurdjanovic ◽  
Jun Ni
Keyword(s):  
Genetic Algorithm ◽  
Formal Methods ◽  
Cylinder Head ◽  
Human Intervention ◽  
Quantitative Characterization ◽  
Measurement Scheme ◽  
Engine Cylinder ◽  
Synthesis Procedure ◽  
Selection Of

The selection of measurements in multi-station machining systems is currently not a systematic process and it involves expert human intervention. In this paper, the recently introduced formal methods for quantitative characterization of measurement schemes in multi-station machining systems are employed in devising systematic measurement scheme synthesis procedures. The newly proposed synthesis procedures were applied in devising measurement schemes in the process used to machine a car engine cylinder head. It was observed that the measurement scheme synthesis procedure based on a genetic algorithm robustly outperformed the synthesis procedures based on the heuristics of successive measurement removal.

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