Wheel-rail steel equivalent fatigue damage simulation method

1 . A method for simulating a wheel-rail steel equivalent fatigue damage, comprising:

acquiring a train load spectrum of a target train serving for a preset mileage;

assigning a wheel-rail systematic three-dimensional model corresponding to the target train according to the train load spectrum, to perform load application simulation to obtain a stress spectrum of a dangerous part of a rim of the target train that is prone to crack, which matches the preset mileage;

determining a target stress and a stress application frequency corresponding to expected simulation mileage to be acted on a wheel-rail steel fatigue sample of the target train according to the stress spectrum of the dangerous part of the rim, which comprises:

sorting respective stress occurrence frequencies of all stresses in the stress spectrum of the dangerous part of the rim in a descending order, to obtain a corresponding stress-frequency sorting result;

performing division operation upon the stress occurrence frequency and the preset mileage of the rim danger stress for each kind of stresses in the stress spectrum of the dangerous part of the rim, to obtain the occurrence frequency in the unit mileage for each stress during the service process of the target train;

selecting at least one wheel rim danger stress with the highest ranking among the stress spectrum of the dangerous part of the rim as the target stress; and

performing multiplication operation upon the occurrence frequency in the unit mileage and the expected simulation mileage for each target stress, to obtain the stress application frequency of the target stress; and

driving a fatigue test machine to initiate a fatigue test on the wheel-rail steel fatigue sample according to the determined target stress and stress application frequency, to obtain wheel-rail steel equivalent fatigue damage data of the target train serving for the expected simulation mileage.

2 . The method according to claim 1 , wherein the step of acquiring the train load spectrum of the target train serving for the preset mileage comprises:

calculating a load value of the load in first level among loads in different levels corresponding to the target train in the train load spectrum according to a wheelset weight and train axle load of the target train;

calculating the occurrence frequency of the load in first level during a service process of the preset mileage according to the possibility the load in first level occurs during the service process of the preset mileage and the possibility the loads in different levels occur during the service process of the target train;

calculating respective load values of the loads in different levels based on the load value of the load in first level according to a preset load ratio among the loads in different levels; and

calculating frequencies of the respective loads in different levels based on the loads in first level, according to a preset frequency ratio among the loads in different levels.

3 . The method according to claim 2 , wherein the step of assigning the wheel-rail systematic three-dimensional model corresponding to the target train according to the train load spectrum to perform load application simulation to obtain the stress spectrum of the dangerous part of the rim of the target train matching the preset mileage comprises:

applying each of loads in different levels corresponding to the train load spectrum on the wheel-rail systematic three-dimensional model according to respective load occurrence frequencies, to perform static contact mechanical behavioral simulation on the wheel-rail system, in order to obtain a rim danger stress and stress occurrence frequency of the dangerous part of rim of the target train based on each of the loads in different levels; and

performing data arrangement upon rim danger stresses and stress occurrence frequencies respectively corresponding to the loads in different levels corresponding to the train load spectrum, to obtain the stress spectrum of the dangerous part of the rim.

4 . A device for simulating wheel-rail steel equivalent fatigue damage comprising:

a processor; and

a memory storing instructions that, when executed by the processor, cause the processor to:

acquire a train load spectrum of a target train serving for a preset mileage;

a assign a wheel-rail systematic three-dimensional model corresponding to the target train according to the train load spectrum, to perform load application simulation to obtain a stress spectrum of a dangerous part of a rim of the target train that is prone to crack, which matches the preset mileage;

a determine a target stress and a stress application frequency corresponding to expected simulation mileage to be acted on a wheel-rail steel fatigue sample of the target train according to the stress spectrum of the dangerous part of the rim, by: sorting respective stress occurrence frequencies of all stresses in the stress spectrum in a descending order, to obtain a corresponding stress-frequency sorting result; performing a division operation upon the stress occurrence frequency and the preset mileage for each stress in the stress spectrum, to obtain an occurrence frequency in a unit mileage of the stress during a service process of the target train; selecting at least one stress ranked highest among the stress-frequency sorting result from the stress spectrum as the target stress; and performing, for the target stress, a multiplication operation upon the occurrence frequency in the unit mileage and the expected simulation mileage, to obtain the stress application frequency of the target stress; and

drive a fatigue test machine to initiate a fatigue test on the wheel-rail steel fatigue sample according to the determined target stress and stress application frequency, to obtain wheel-rail steel equivalent fatigue damage data of the target train serving for the expected simulation mileage.

5 . The device according to claim 4 , wherein the instructions cause the processor to acquire the train load spectrum by:

calculating a load value of the load in first level among loads in different levels corresponding to the target train in the train load spectrum according to a wheelset weight and train axle load of the target train; and

calculating an occurrence frequency of the load in first level during a service process of the preset mileage according to the possibility the load in first level occurs during the service process of the preset mileage and the possibility the loads in different levels occur during the service process of the target train;

wherein calculating the load value further comprises calculating respective load values of the loads in different levels based on the load value of a load in first level, according to a preset load ratio among the loads in different levels; and

wherein calculating the occurrence frequency further comprises calculating frequencies of the respective loads in different levels based on the loads in first level, according to a preset frequency ratio among the loads in different levels.

6 . The device according to claim 5 , wherein the instructions cause the processor to obtain the stress spectrum by:

applying, respectively according to a corresponding load occurrence frequency, the loads in different levels corresponding to the train load spectrum on the wheel-rail systematic three-dimensional model to perform wheel-rail system static contact mechanical behavioral simulation, in order to obtain a danger stress and stress occurrence frequency of the dangerous part of the rim based on loads in different levels; and

performing data arrangement upon respective corresponding danger stresses and stress occurrence frequencies of the loads in different levels corresponding to the train load spectrum, to obtain the stress spectrum of the dangerous part of the rim.

7 . A calculation equipment comprising a processor and a memory, wherein the memory stores a calculation process executable by the processor, and the processor executes the calculation process to perform the wheel-rail steel equivalent fatigue damage simulation method according to claim 1 .

8 . A calculation equipment comprising a processor and a memory, wherein the memory stores a calculation process executable by the processor, and the processor executes the calculation process to perform the wheel-rail steel equivalent fatigue damage simulation method according to claim 2 .

9 . A calculation equipment comprising a processor and a memory, wherein the memory stores a calculation process executable by the processor, and the processor executes the calculation process to perform the wheel-rail steel equivalent fatigue damage simulation method according to claim 3 .

10 . A non-transitory readable storage medium storing a calculation process, wherein the calculation process is executed by a processor to perform the wheel-rail steel equivalent fatigue damage simulation method according to claim 1 .

11 . A non-transitory readable storage medium storing a calculation process, wherein the calculation process is executed by a processor to perform the wheel-rail steel equivalent fatigue damage simulation method according to claim 2 .

12 . A non-transitory readable storage medium storing a calculation process, wherein the calculation process is executed by a processor to perform the wheel-rail steel equivalent fatigue damage simulation method according to claim 3 .