Comparative Study of Identification Using Nonlinear Least Squares Errors and Particle Swarm Optimization Algorithms for a Nonlinear DC Motor Model

Abedinifar, Masoud; Ertuğrul, Şeniz

doi:10.1007/978-3-030-85626-7_65

Cited by 2 publications

(1 citation statement)

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“…Liu et al applied the PSO algorithm to estimate the time-varying parameters of the permanent magnet synchronous motor model [26]. In related research by the authors, the PSO algorithm is applied to identify the unknown parameters of nonlinear models of a direct current (DC) motor [27,28]. It is demonstrated that the PSO algorithm successfully identifies the model parameters with different nonlinear friction terms.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear model identification and statistical verification using experimental data with a case study of the UR5 manipulator joint parameters

2022

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The identification of nonlinear terms existing in the dynamic model of real-world mechanical systems such as robotic manipulators is a challenging modeling problem. The main aim of this research is not only to identify the unknown parameters of the nonlinear terms but also to verify their existence in the model. Generally, if the structure of the model is provided, the parameters of the nonlinear terms can be identified using different numerical approaches or evolutionary algorithms. However, finding a non-zero coefficient does not guarantee the existence of the nonlinear term or vice versa. Therefore, in this study, a meticulous investigation and statistical verification are carried out to ensure the reliability of the identification process. First, the simulation data are generated using the white-box model of a direct current motor that includes some of the nonlinear terms. Second, the particle swarm optimization (PSO) algorithm is applied to identify the unknown parameters of the model among many possible configurations. Then, to evaluate the results of the algorithm, statistical hypothesis and confidence interval tests are implemented. Finally, the reliability of the PSO algorithm is investigated using experimental data acquired from the UR5 manipulator. To compare the results of the PSO algorithm, the nonlinear least squares errors (NLSE) estimation algorithm is applied to identify the unknown parameters of the nonlinear models. The result shows that the PSO algorithm has higher identification accuracy than the NLSE estimation algorithm, and the model with identified parameters using the PSO algorithm accurately calculates the output torques of the joints of the manipulator.

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Section: Introductionmentioning

confidence: 99%