Identification of Robot Joint Torsional Stiffness Based on the Amplitude of the Frequency Response of Asynchronous Data
Abstract
:1. Introduction
2. Dynamic Modeling of the Robot Joint with Single Degree of Freedom
3. Proposed Parameter Identification Method
3.1. The Excitation Signal of the Swing Movement
3.2. Calculation of the Electromagnetic Torque
- (1)
- Clarke transformation can be written as follows:
- (2)
- Park transformation can be written as follows:
3.3. Error Criterion Function of the Identification Method of the Amplitude of the FRF
3.4. Calculation of the Frequency Response Function
3.5. Levenberg-Marquardt Algorithm
- (1)
- The dynamic model of a single robot joint is established.
- (2)
- The speed command signal is set as a triangle wave so that the electromagnetic torque follows a rectangular window to excite the system.
- (3)
- The current signal and the motor encoder signal are collected to calculate the electromagnetic torque and the motor speed.
- (4)
- The ratio between the cross-power spectrum of input and output signals and the self-power spectrum of input signals is calculated to obtain the amplitude of the FRF.
- (5)
- The L-M optimization algorithm is used to fit the experimental and theoretical amplitude of the FRF to minimize the error.
- (6)
- The shaft stiffness is identified from the amplitude of the FRF.
4. Simulations
5. Experimental Identification
5.1. Experimental System
5.2. The Impact of the Acceleration Time on Excitation
5.3. Parameter Identification
6. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Data | True Value | Identification Result | Error (%) |
---|---|---|---|
FRF of the synchronous data | 891 | 866.13 | 2.79 |
FRF of the asynchronous data | 891 | 654.67 | 26.52 |
amplitude of FRF of the asynchronous data | 891 | 859.93 | 3.49 |
Parameter | Value |
---|---|
PMSM rated power | 2.3 |
PMSM torque constant | 3 |
Moment of inertia of PMSM | |
Moment of inertia of reducer | |
Reduction ratio | |
Articulated arm mass | 5 |
Articulated arm length | 75 |
Moment of inertia of articulated arm | |
Reducer stiffness | |
Elastic coupling stiffness |
Data | True Value | Identification Result | Error (%) |
---|---|---|---|
FRF of the asynchronous data | 891 | 1229 | 37.93 |
amplitude of FRF of the asynchronous data | 891 | 851.9 | 4.49 |
Parameter | True Value | Initial Value | Initial Error (%) | Identification Result | Identification Error (%) |
---|---|---|---|---|---|
() | 891 | 100 | 88.78 | 807.34 | 9.39 |
() | 0.003027 | 0.001 | 66.96 | 0.00292 | 3.53 |
() | 0.00748 | 0.005 | 33.16 | 0.00676 | 9.57 |
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Xu, K.; Wu, X.; Liu, X.; Wang, D. Identification of Robot Joint Torsional Stiffness Based on the Amplitude of the Frequency Response of Asynchronous Data. Machines 2021, 9, 204. https://doi.org/10.3390/machines9090204
Xu K, Wu X, Liu X, Wang D. Identification of Robot Joint Torsional Stiffness Based on the Amplitude of the Frequency Response of Asynchronous Data. Machines. 2021; 9(9):204. https://doi.org/10.3390/machines9090204
Chicago/Turabian StyleXu, Kai, Xing Wu, Xiaoqin Liu, and Dongxiao Wang. 2021. "Identification of Robot Joint Torsional Stiffness Based on the Amplitude of the Frequency Response of Asynchronous Data" Machines 9, no. 9: 204. https://doi.org/10.3390/machines9090204