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Fatigue life evaluation method of diesel locomotive

A technology for fatigue life and diesel locomotives, which is applied in the direction of railway vehicle testing, etc., can solve the problem that it is difficult to calculate the damage status of diesel locomotives, and achieve the effect of high reliability

Inactive Publication Date: 2008-12-10
BEIJING JIAOTONG UNIV +1
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  • Application Information

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Problems solved by technology

It is difficult to calculate the actual damage status of diesel locomotives with different service life by using equivalent kilometers

Method used

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  • Fatigue life evaluation method of diesel locomotive
  • Fatigue life evaluation method of diesel locomotive
  • Fatigue life evaluation method of diesel locomotive

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Experimental program
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Embodiment Construction

[0029] The specific process of fatigue life estimation of Dongfeng diesel locomotive as an example is given below in conjunction with the accompanying drawings.

[0030] (1) The diesel engine, synchronous main generator, axle and bogie frame are selected as the key equipment for estimating the fatigue life of diesel locomotives.

[0031] (2) Select the variables that affect the fatigue life of key equipment:

[0032] For a diesel engine, the output torque of the crankshaft is selected as a variable to characterize its stress condition;

[0033] Synchronous main generator, select its output current as a variable representing the damage caused by electrical stress;

[0034]For the axle and bogie frame, the output torque of the traction motor is taken as a variable to characterize its stress condition;

[0035] (3) Collect data: collect the output voltage and output current of the synchronous main generator of the locomotive, the speed of the diesel engine, the speed of the tra...

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Abstract

The invention relates to a fatigue service life estimation method for a gas engine which includes the follows: firstly selecting the key devices for estimating the fatigue service life of the gas engine; then selecting a variable which affects the fatigue service life of each key device; obtaining the needed variable value by collecting relevant data; working out the injury tolerance of each key device by utilizing a Miner rule in a fatigue accumulation injury theory; when the value is equal to 1, considering the devices to reach the fatigue service life and need to be overhauled. The integral fatigue injury tolerance for the gas engine is equal to the fatigue injury tolerance of each key device multiplied by the sum of the corresponding weight coefficients; when the value is larger than 1, then the engine is considered to reach the fatigue service life and need to be heavily repaired. Finally an estimation result is led to approach the actual injury situation of the engine by correcting the weight coefficients, thus being used as a basic for confirming the heavy repair period of the engine. The invention is different from the traditional method which uses the running kilometrages and the equivalent kilometrages to confirm the period for the heavy repair of the engine and essentially reflects the injury situation of the gas engine; so the reliability of the estimation result is higher.

Description

technical field [0001] The invention relates to a method for estimating the fatigue life of locomotives, in particular to a method for estimating the fatigue life as the basis for determining the overhaul cycle of diesel locomotives. Background technique [0002] In order to meet the ever-increasing needs of national economic development, China's railways have undergone six major speed increases in recent years, during which the passenger and freight transport capacity has increased by 18%, and the requirements for locomotives are getting higher and higher. At present, there are more than 10,000 diesel locomotives in service on the whole railway, which play a decisive role in the safe and efficient operation of railway transportation. Especially, the occurrence of the snow disaster in the south in early 2008 showed the irreplaceability of diesel locomotives. Therefore, the safe and reliable operation of diesel locomotives is one of the most basic conditions to ensure the nor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M17/08
Inventor 狄威刘军刘志刚沈茂盛苏劼王磊全恒立牟富强
Owner BEIJING JIAOTONG UNIV
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