As in catenary-pantograph system

the amount of wear caused by the sliding contact is affected by the contact force.When the load is smaller

there will be erosion resistance wear;at the other hands

there will be mechanism wear when the load is bigger.So some experiments using carbon sliding panel infiltrated with copper have been taken to find the relationship between the load and wear.In these experiments

there were a lot of data at the condition of different values of current and velocity.And then the data will be trained using the BP nerve-network method

whose input is the load and output is the wear data.Also black-box model should be validated using the other data.Based on this

an optimization algorithm will be used to the black-box model to find the best value of the load

which makes the wear minimal.