A Fuzzy Modified Elastoplastic Friction Model for Parameter Estimation with MHE
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摘要
Friction modeling plays a very important role in control and simulation systems. A lot of dynamic models are proposed to capture most of the friction behavior observed experimentally. Most dynamic models are typically considered to be dependent only on relative speed and relative displacement of contacting surfaces. However, it is known that dynamic characteristics of friction are affected by other factors besides speed and displacement. In this paper, a modified Elastoplastic model is presented in order to closely approximate the Elastoplastic model. In contrast to the Elastoplastic model, the modified model consists of an infinitely differentiable transition function. Such a model is well suited for gradient-based state and parameter estimation methods such as moving horizon estimation. To consider the friction changes caused by many other factors(e.g. load, temperature, lubrication, etc., but without speed and displacement), a fuzzy system is designed to establish a mapping between the other factors and the modified Elastoplastic model parameters. The complex effects of other factors on friction are fitted through the fuzzy system, while the dynamic characteristics of friction are not lost. Simulation results verify the effectiveness of the proposed model.
Friction modeling plays a very important role in control and simulation systems. A lot of dynamic models are proposed to capture most of the friction behavior observed experimentally. Most dynamic models are typically considered to be dependent only on relative speed and relative displacement of contacting surfaces. However, it is known that dynamic characteristics of friction are affected by other factors besides speed and displacement. In this paper, a modified Elastoplastic model is presented in order to closely approximate the Elastoplastic model. In contrast to the Elastoplastic model, the modified model consists of an infinitely differentiable transition function. Such a model is well suited for gradient-based state and parameter estimation methods such as moving horizon estimation. To consider the friction changes caused by many other factors(e.g. load, temperature, lubrication, etc., but without speed and displacement), a fuzzy system is designed to establish a mapping between the other factors and the modified Elastoplastic model parameters. The complex effects of other factors on friction are fitted through the fuzzy system, while the dynamic characteristics of friction are not lost. Simulation results verify the effectiveness of the proposed model.
引文
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