Radial clamping force distribution model and parameter sensitivity analysis of spool valve couples
In order to find a manufacturing process method for improving the resolution consistency of batch electro-hydraulic servo valves,a radial clamping force distribution model was established to describe the uncertainty of clamping force under parameter perturbation within the radial dimension tolerance range.And the distribution characteristics of the radial clamping force of spool valve couples were obtained.Furthermore,a response surface surrogate model of the mapping relationship between process parameters and radial clamping force distribution characteristic parameters was established.On this basis,global sensitivity analysis of radial clamping force distribution characteristic parameters to process parameters was carried out.The results showed that with the perturbation of radial dimension parameter,the radial clamping force was subject to Weibull distribution.Compared with the radial clearance,spool's cylindricity had less effect for radial clamping force.Compared with reducing the variation range of the radial clearance,reducing lower limit of radial clearance was more effective to improve the consistency of radial clamping force.Compared with reducing the lower limit of radial clearance,reducing the variation range of radial clearance was more significant to reduce radial clamping force as a whole.
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