Analysis of Rotational Vibration Mechanism of Camshaft at High Engine Speed in Engines with In-Line Four-Cylinder DOHC Configuration

2018 ◽  
Author(s):  
Ryoh Hatakeyama ◽  
Tadashi Niino
Keyword(s):  
Engine Speed ◽  
Rotational Vibration ◽  
High Engine Speed ◽  
Vibration Mechanism

Effects of Design for Piston Pin and Bearing on State of Bearing Lubrication

2007 ◽  
Author(s):  
Hideyuki Iwasaki ◽  
Yuuto Higasa ◽  
Masaaki Takiguchi ◽  
Seiichi Sue ◽  
Keitaro Shishido
Keyword(s):  
Contact Pressure ◽  
Engine Speed ◽  
Gasoline Engine ◽  
The State ◽  
Bearing Contact ◽  
High Engine Speed

We measured the friction of piston pin boss bearings for a gasoline engine to make sure of the state of lubrication. In addition, we checked how the shape of the piston pin as well as that of the pin boss influenced the state of bearing lubrication, which was analyzed according to the FEM calculations of pin and bearing contact pressure. As a result, it was made clear that the state of bearing lubrication sharply deteriorated at an engine speed of 3500 rpm or higher because the deformed pin caused the pin edge to heavily come into contact with the bearing, and a side relief was able to improve the state of lubrication at a high engine speed. We also gave a check to the piston pin for thickness to see how it influenced the state of lubrication, finding that a lighter-weight pin led to the deterioration of lubrication.

scholarly journals Crank Angle Resolved HC-Detection Using LIF in the Exhausts of Small Two-Stroke Engines Running at High Engine Speed

1996 ◽  
Author(s):  
Öivind Andersson ◽  
Greger Juhlin ◽  
Martin Ekenberg ◽  
Bengt Johansson ◽  
Marcus Aldén
Keyword(s):  
Engine Speed ◽  
Crank Angle ◽  
High Engine Speed

scholarly journals Analisis Kekasaran Baja AISI 304 Akibat Variasi Parameter pada Proses Roughing CNC Turning Menggunakan Pahat Cermet

2020 ◽  
Vol 3 (1) ◽  
pp. 18
Author(s):  
Nugroho Setyo Pambudi
Keyword(s):  
Surface Roughness ◽  
Engine Speed ◽  
Descriptive Analysis ◽  
Feed Speed ◽  
Aisi 304 ◽  
Analysis Techniques ◽  
Spindle Rotation ◽  
High Engine Speed ◽  
High Feed ◽  
Data Collection Technique

Abstract: This study aims to determine the surface roughness value of AISI 304 steel due to variations in spindle speed and feed motion. The method used is pre-experimental design and data analysis techniques used are descriptive analysis techniques. The spindle rotation speed used is 1990 rpm, 2100 rpm, and 2300 rpm, while the feed motion used is 0.18 mm / rev, 0.23 mm / rev, and 0.28 mm / rev. The cutting tool used in this study is a Mitsubishi brand insert chisel with ISO standard CNMNG120404-MA, while the data collection technique using a measuring tool to measure the surface roughness of the workpiece is the Surface Roughness Test Mitutoyo Portable Surftest SJ 301 series. The results of this study indicate that high engine speed reaches 2300 Rpm and low feed motion reaches 0.18 mm / rev resulting in low surface roughness levels reaching 2.17 µm. While the highest is obtained at low engine speed and high feed motion which reaches 1900 Rpm and 0.28 mm / rev with a surface roughness value of 4.43 µm.Keywords: Spindle rotation, feed speed, turning, CNC lathe, surface roughness. 

Combustion performance investigation of aviation kerosene (RP-3) on a compression ignition diesel engine under various loads

2021 ◽  
pp. 1-22
Author(s):  
Rui Liu ◽  
Kaisheng Huang ◽  
Yuan Qiao ◽  
Zhenyu Wang ◽  
Haocheng Ji
Keyword(s):  
Engine Speed ◽  
Pilot Injection ◽  
Compression Ignition ◽  
Combustion Performance ◽  
Combustion Duration ◽  
Peak Heat Release Rate ◽  
Crank Angle ◽  
Main Injection ◽  
High Engine Speed ◽  
Heavy Loads

Abstract The combustion performance of a compression ignition (CI) four-stroke aviation engine fueled with pure No. 3 rocket propellant (RP-3) was experimentally investigated for comparison with diesel. Pilot injection and main injection for RP-3 and diesel were unified under same test conditions. The results show that when burning RP-3, the maximum power of engine is 1% lower than that of burning diesel, with lower specific fuel consumption (SFC) and effective thermal efficiency (ETE). The combustion durations of RP-3 and diesel show small differences of less than 0.4°CA under heavy loads, while the combustion duration of RP-3 is shorter than that of diesel under low loads. The crank angle at 50% mass fraction burnt (CA50) of RP-3 shows differences of 0.3-1°CA compared to that of diesel. For pilot injection at a high engine speed, the ignition delay angle (IDA) of RP-3 is basically equal to that of diesel. With decreasing engine speed, the maximum difference of 1.2°CA in IDAs exist under medium or small loads. For the main injection, the IDA of RP-3 is lager than diesel under heavy loads at various engine speeds. As the load decreases, the IDA of RP-3 is extended. The peak heat release rate (HRR) of RP-3 during main injection combustion is basically the same as diesel under heavy loads, while the intervention effect of unburnt pilot-injected RP-3 under low loads results in a higher peak HRR.

Coupled-Mode Dynamic Instability of Tainter Gates With Parallel Bending Vibration of the Skinplate

2010 ◽  
Author(s):  
Keiko Anami ◽  
Noriaki Ishii ◽  
Takuma Tsuji ◽  
Tatsuya Oku ◽  
Masaru Goto ◽  
...  
Keyword(s):  
Dynamic Instability ◽  
Laboratory Model ◽  
Dynamic Coupling ◽  
Bending Vibration ◽  
Coupled Mode ◽  
Excited Vibration ◽  
Rotational Vibration ◽  
The Usa ◽  
Vibration Mechanism ◽  
Vibration Tests

As part of the investigation of the dynamic instability of the gate closely related to the Folsom Dam Tainter-gate failure, and in order to assure the dynamic stability of the gate, the field vibration tests on three full-scale operational Tainter-gates were conducted. From these tests, the possible existence of another coupled-mode self excited vibration mechanism, which involves the dangerous dynamic coupling of the whole gate rigid-body rotational vibration with a “parallel” bending vibration of the skinplate was suggested. This paper presents the mechanism of the suggested coupled-mode self-excited vibration, theoretical analysis for the suggested dynamic instability, and 2-dimensional laboratory model tests results. Further, the need for retrofit countermeasures for Tainter gates which are currently installed in both Japan and the USA and susceptible to this dangerous coupled-mode dynamic instability is emphasized.

Analysis of Oil Consumption at High Engine Speed by Visualization of the Piston Ring Behaviors

2000 ◽  
Author(s):  
Masatoshi Basaki ◽  
Kimitaka Saito ◽  
Tatsushi Nakashima ◽  
Takao Suzuki
Keyword(s):  
Piston Ring ◽  
Engine Speed ◽  
Oil Consumption ◽  
High Engine Speed
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