Experimental Study on Anti-Fatigue Damage Structural Design of Diesel Engine Bearings

2012 ◽  
Vol 214 ◽  
pp. 97-101
Author(s):  
Zhen Jie Guo
Keyword(s):  
Experimental Study ◽  
Fatigue Life ◽  
Diesel Engine ◽  
Service Life ◽  
Fatigue Damage ◽  
Working Conditions ◽  
Structural Design ◽  
Connecting Rod ◽  
Main Bearing ◽  
Modern Times

With higher requirements on energy-saving and environmental protection of diesel engine in the modern times, the loads on main bearing and connecting rod bearing of diesel engine are continuously increased, and also working conditions are even more critical. Bearings are the key moving parts of diesel engine, and play an important influence on reliability, service life and other performances of diesel engine. Therefore, the reasons for fatigue damages to its bearings greatly affect fatigue life. In traditional designs, effects of the problem are studied few. In this paper, therefore, this problem is studied for discussing the formation reasons and solutions for it theoretically.

3D Finite Element Analysis of High-Pressure Common Rail Diesel Engine Connecting Rod

2011 ◽  
Vol 354-355 ◽  
pp. 531-534
Author(s):  
Bin Zheng ◽  
Yong Qi Liu ◽  
Rui Xiang Liu ◽  
Jian Meng
Keyword(s):  
Finite Element ◽  
High Pressure ◽  
Life Cycle ◽  
Fatigue Life ◽  
Diesel Engine ◽  
Principal Stress ◽  
Safety Factor ◽  
Maximum Principal Stress ◽  
Connecting Rod ◽  
3D Finite Element

In this paper, with the ANSYS, stress distribution, safety factor and fatigue life cycle of high-pressure common rail diesel engine connecting rod were analyzed by using 3D finite element method. The results show that the position of maximum principal stress is transition location of small end and connecting rod shank at maximum compression condition. The value of stress is 253.98 MPa in dangerous position. Safety factor is 2.67. The position of maximum principal stress is medial surface of small end at maximum stretch condition. The value of stress is 87.199 MPa in dangerous position. The fatigue life cycle of connecting rod is 2.6812×108. Fatigue safety factor is 1.5264.

scholarly journals Methods for estimating the durability of the needle bearing of the piston head of the connecting rod of a transportation diesel

2021 ◽  
pp. 55-60
Author(s):  
Vadym Mychaylovich Petuhov ◽  
Alexandr Vasilyevich Orobinsky ◽  
Natalya Anatolyevna Aksenova
Keyword(s):  
Diesel Engine ◽  
Service Life ◽  
Test Procedure ◽  
Operating Conditions ◽  
Accelerated Tests ◽  
Connecting Rod ◽  
Design Work ◽  
Engine Operation ◽  
Piston Head ◽  
Rolling Elements

The article presents the results of an experimental study and analytical evaluation calculations to check service life and increase durability of the needle bearing of piston head of connecting rod of a transport diesel engine. The primary reasons for the violation of the nominal operation of the main units of this mechanism have been established. Corresponding recommendations are proposed for carrying out accelerated tests for durability, reducing the thermal loads of the bearing operation and, as a consequence, improving the quality and service life of its entire piston group. Theoretical and experimental methods for determining the nominal life of the needle bearing of the piston head of the connecting rod (PHCR) of a transport diesel engine are proposed. The theoretical methodology allows obtaining reliable values of durability, taking into account the distribution of the working load over the rolling elements, as well as the mobility of the piston pin and sleeve. The performed calculations make it possible to correct and clarify the standard mathematical model for determining the nominal life of the PHCR needle bearing, depending on the distribution of loads on the rolling elements (rollers) under different operating conditions. This experimental technique with an acceleration factor of 10 is based on a twofold increase in the force effect on the elements of the PHCR needle bearing. This was achieved by assembling the bearing using a special technology, which is described in detail in the work. A significant decrease in the thermal effect and a decrease in radial loads on working rollers have been established. For ensure the regular oil supply into bearing during engine operation, a technique was developed to increase the load on the roller in contact zone, which significantly influenced durability and made it possible to conduct accelerated tests with a reliable yield. Its results of operational research and experience in design work correlate and are sufficiently explained by the developed methods, which allows them to be used for the improvement and modernization of connecting rods with needle bearings in PHCR. That is a permission to use these methodic for doing perfect and modern the needle bearing of the connecting-rod piston. Keywords: diesel, test procedure, needle bearing, rollers, piston head of the connecting rod, durability.

Using a Dovetail Fixture to Study Fretting Fatigue and Fretting Palliatives

2003 ◽  
Vol 128 (2) ◽  
pp. 133-141 ◽  
Author(s):  
B. P. Conner ◽  
T. Nicholas
Keyword(s):  
Fatigue Life ◽  
Service Life ◽  
Fatigue Damage ◽  
Fretting Fatigue ◽  
Fatigue Tests ◽  
Turbine Engines ◽  
Aluminum Bronze ◽  
Gas Turbine Engines ◽  
Contact Loads ◽  
Low Plasticity Burnishing

Fretting fatigue damage can reduce the service life of engineering components in contact. The attachment between blades and disks in the fan and compressor stages of gas turbine engines is often a dovetail geometry. As a result, normal and tangential cyclic contact loads are present. Results of fretting fatigue tests using a new dovetail fixture are detailed here. Dovetail specimens and three types of contact pads were all machined out of Ti−6A1−4V. Two types of palliatives are also examined: aluminum bronze coatings and low-plasticity burnishing. While the palliatives were effective in increasing the fatigue life, the three pad geometries produced essentially the same fatigue life.

Structural Fatigue Analysis of a Container Crane

2012 ◽  
Vol 159 ◽  
pp. 272-276
Author(s):  
Shi Qing Lu ◽  
Han Bin Xiao ◽  
Ping Deng
Keyword(s):  
Fatigue Life ◽  
Service Life ◽  
Data Processing ◽  
Structural Design ◽  
Time History ◽  
Structural Fatigue ◽  
Container Crane ◽  
Collection Data ◽  
Damage Law

This paper presents an approach to evaluate the structural fatigue life of port cranes. Based on a testing of 40t/45m container crane in a port of China, the stress time-history collection, data processing, the determination of S-N curve and the distribution of the load amplitude is analyzed in detail. Finally, the modified linear cumulative damage law is employed to evaluate the remaining safety service life of the container crane. The result of this study can be a reference for the anti-fatigue structural design of cranes, and it also provides a guideline for ports’ management and maintenance departments to make maintenance plans for port cranes.

Experimental Study on the Parameters of Service Life of Rolling-Bearings

2013 ◽  
Vol 454 ◽  
pp. 110-113
Author(s):  
Wen Si Hao
Keyword(s):  
Experimental Study ◽  
Service Life ◽  
Frequency Domain ◽  
Working Conditions ◽  
Wavelet Packets ◽  
Regular Pattern ◽  
Rolling Bearings ◽  
Outer Circle ◽  
Wear And Tear

In this paper, vibration information of rolling bearings under 5 working conditions, including normal bearings, bearings with wear and tear on the outer circle or running pulley and so on, are collected. Obtained the relationships between parameters of service life of bearings and changes of time, such as the amplitude range, the frequency domain, and the energy around wavelet packets. Summarized a more detailed regular pattern for bearings wear and tear.

scholarly journals Experimental Study of the Influence on the Residual Fatigue Life of 45 # Steel Fatigue Damage Specimens

2013 ◽  
Vol 275-277 ◽  
pp. 220-224
Author(s):  
Ping Wang ◽  
Rong Yang ◽  
Ji Feng Tian
Keyword(s):  
Experimental Study ◽  
Fatigue Life ◽  
Fatigue Damage ◽  
High Voltage ◽  
Voltage Pulse ◽  
Pulse Discharge ◽  
High Voltage Pulse ◽  
Residual Fatigue Life ◽  
Residual Fatigue

Abstract. In this paper, the fatigue life of the 45 # steel specimens is tested. Two groups of fatigue damage specimens are prepared for the experimental study. Their fatigue cycles respectively reached 80% and 90% of the fatigue life tested. The repairing experiments to the two groups’ specimens by the high voltage pulse discharge are finished. After these repairing experiments, the residual fatigue lives of the two group specimens repaired are tested. The results show that the residual fatigue lives of the specimens are improved greatly. The total fatigue lives of the specimens have been increased at least 160% of the fatigue life tested.

Analysis of Fatigue Reliability and Fatigue Life for a High Voltage Valve

2012 ◽  
Vol 479-481 ◽  
pp. 2072-2075
Author(s):  
Ji Kang Bo
Keyword(s):  
Fatigue Life ◽  
Service Life ◽  
Failure Mode ◽  
Fatigue Damage ◽  
Fatigue Failure ◽  
High Voltage ◽  
Failure Probability ◽  
Fatigue Reliability ◽  
Actual Application ◽  
Working Principle

The high voltage valve bears repeated loads and impact in its working state. Fatigue failure or fatigue damage is the most common failure mode of high voltage valves. This work analyzes the working principle and working characteristics of a high voltage valve under a static rated load, and proposes the necessity of the fatigue analysis. The failure probability of the high voltage valve is presented and the service life of the entire valve obtained. To find the part prone to fail, the evaluation of the fatigue life of the high voltage valve is carried out. The fatigue life and safety factor of the high voltage valve is obtained. It is found that the edge joints are easy to fatigue failure, which provides a reference for the actual application and of maintenance the high voltage valve.

Experimental Study on Improving Abrasion Resistance of Sizing Crusher Tooth

2010 ◽  
Vol 150-151 ◽  
pp. 1311-1314
Author(s):  
Yong Tai Pan ◽  
Yong Zhi Li
Keyword(s):  
Experimental Study ◽  
Wear Resistance ◽  
Service Life ◽  
Working Conditions ◽  
Abrasion Resistance ◽  
System Analysis ◽  
Average Life ◽  
Wear Resistant ◽  
Coal Classification ◽  
The Subject

The shorter service life of sizing crusher tooth is a difficult technology problem. At present the coal classification used in crushing machine, due to poor working conditions, despite the use of wear resistant surfacing electrode to improve the wear resistance of broken teeth, broken teeth, but not to the average life of six months, the subject of study was significantly improve the life of the crusher tooth. To improve the service life of sizing crusher tooth, some research has been done, through system analysis and test some result can be concluded.

scholarly journals A Study on Anti-Shock Performance of Marine Diesel Engine Based on Multi-Body Dynamics and Elastohydrodynamic Lubrication

2021 ◽  
Vol 11 (23) ◽  
pp. 11259
Author(s):  
Liang Chen ◽  
Dongxin Xue ◽  
Xigeng Song ◽  
Zhaoqi He ◽  
Dongjie Huang
Keyword(s):  
Diesel Engine ◽  
Working Conditions ◽  
Diesel Engines ◽  
Underwater Explosion ◽  
Elastohydrodynamic Lubrication ◽  
Step Size ◽  
Main Bearing ◽  
Calculation Step ◽  
Body Dynamics ◽  
Multi Body

Diesel engine anti-shock performance is important for navy ships. The calculation method is a fast and economic way compared to underwater explosion trial in this field. Researchers of diesel engine anti-shock performance mainly use the spring damping model to simulate the main bearings of a diesel engine. The elastohydrodynamic lubrication method has been continuously used in the main bearings of diesel engines in normal working conditions. This research aims at using the elastohydrodynamic lubrication method in the main bearings of the diesel engine in external shock conditions. The main bearing elastohydrodynamic lubrication and diesel engine multi-body dynamics analysis is based on AVL EXCITE Power Unite software. The external shock is equivalent to the interference on the elastohydrodynamic lubrication calculation. Whether the elastohydrodynamic lubrication algorithm can complete the calculation under interference is the key to the study. By adopting a very small calculation step size, a high number of iterations, and increasing the stiffness of the thrust bearing, the elastohydrodynamic lubrication algorithm can be successfully completed under the external impact environment. The calculation results of the accelerations on engine block feet have a similar trend as the experiment results. Diesel engines with and without shock absorbers in external shock conditions are calculated. This calculation model can also be used for diesel engine dynamics calculations and main bearing lubrication calculations under normal working conditions.

Sign in / Sign up

Export Citation Format

Share Document