Case-based parametric design system for test turntable

Analyzing the history of design is helpful in creating the computer numerical control turret design. Knowledge acquired from reasonably organizing and reusing designs may contribute to establishing computer numerical control turret design tasks. This article presents the results of our study on the representation and reuse of computer numerical control turret design knowledge and highlights the application of a case-based reasoning method in the structure design of a computer numerical control turret. The primary step in case-based reasoning systems is case retrieval where the similarity measure plays a significant role. The objective of this study is to develop a new method for a hybrid similarity measure with five formats of attribute values: crisp symbols, crisp numbers, fuzzy numbers, fuzzy linguistic variables, and fuzzy intervals. First, a hybrid similarity measure for a mixture of crisp and fuzzy sets is proposed for retrieving cases. Subsequently, a synthesis weight is formed through the combination of the subjective weight and objective weight. The calculation formula of the global similarity, which can retrieve the proper historical case, can be established by combining the hybrid similarity measure and the synthesis weight measure accordingly. Finally, the hybrid similarity measure and weight assignment method were applied in a computer numerical control turret conceptual design case-based reasoning system. The results showed that the global similarity of these five attribute types and the distribution of weight coefficients could improve the accuracy of case retrieval, which would help designers achieve the goal of rapid design.

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“…These processes demand a significant amount of time. [5][6][7] Design method of CNC turret based on CBR framework…”

Section: Design Methods Of Cnc Turret Based On Cbrmentioning

confidence: 99%

Hybrid similarity measure for retrieval in case-based reasoning systems and its applications for computer numerical control turret design

Wang

Sun

Shen

2016

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…The two-axis precision non-magnetic turntable based on ultrasonic motor has high response speed and response time as short as 10ms. The control system does not have large overshoot and system oscillation, and is not sensitive to external vibration interference, which is also beneficial to ensure the accurate positioning performance of the two-axis turret [20].…”

Section: Joystick Control Modementioning

confidence: 99%

Research on Accuracy Analysis and Motion Control of Two-axis Non-magnetic Turntable Based on Ultrasonic Motor Journal

Wang

2020

mech

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In the calibration process of the positioner, in order to obtain the accurate angular position information of each axis of the turntable, it is necessary to test the rotation accuracy of the turntable higher than the accuracy of the target gyroscope, in order to achieve the test and calibration of the positioner. Therefore, this paper uses the non-magnetic technology to carry out research on the pointing accuracy and motion control of the turntable. At the same time, the influence of grating installation error on precision detection is analysed. The influence of steady-state error of turntable on the motion accuracy of turntable is analysed. Finally, the influence of servo control parameters on the dynamic performance of turntable and the influence on steady-state error are analysed. The test of the corner positioning accuracy of the turntable is carried out. The positioning accuracy and motion control parameters of the two-axis precision non-magnetic turntable are obtained, and the PID adjustment is introduced to make the accuracy index of the non-magnetic turntable meet the requirements. The turntable can realize a non-magnetic working environment and can achieve the high precision required by the index under the driving of the ultrasonic motor.

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“…The motor-drive servo turntable is widely used in the aerospace and aviation industries. The mechanical design [7,8], driving motor [9,10] and sensor [11] all developed. However, the control scheme of the motor-drive servo turntable has a great possibility for improvement.…”

Section: Introductionmentioning

confidence: 99%

“…There is non-linear disturbance such as friction, dead-zone, backlash, toque fluctuation of drive motor, etc. Among them, investigation results show that friction is one of the main reasons for performance degradation in the motor-drive servo turntable system [4][5][6][7][8]. Friction is ubiquitous in the mechanical systems, and creates much control related problems such as serious steady-state errors, oscillations [4], stick-slip motions, and limit cycles [6].…”

Section: Introductionmentioning

confidence: 99%

Identification and control of the motor‐drive servo turntable with the switched friction model

Zhang

Wang²,

Ninghao

2020

IET Electric Power Applications

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In this study, the identification and control scheme of the motor-drive servo turntable are researched to achieve accurate tracking. Firstly, the input-output identification experiments are designed and realised for the global model of motordrive servo turntable. The order of the global controlled auto-regressive model is determined by the Akaike information criterion, and the parameters are estimated by a particle swarm optimisation-cuckoo search algorithm. Secondly, the switched friction model is built combining the LuGre structure and the Stribeck curve. The switching conditions and the parameters of the switched friction model are determined though the input-output and the friction experiments. A constrained multi-objective optimisation problem is constructed for the parameter identification of the switched friction model. It is solved via a fuzzy comprehensive evaluation. Finally, the composite control strategy, in which the proportional-integral-derivative controller and model-based friction observer are combined, is proposed in the azimuth angle system of the motor-drive servo turntable. The trajectory tracking results in simulation and experiment illustrate the effectiveness of the proposed switched model, identification method, and composite control strategy.

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Case-based parametric design system for test turntable

Cited by 32 publications

References 20 publications

Hybrid similarity measure for retrieval in case-based reasoning systems and its applications for computer numerical control turret design

Hybrid similarity measure for retrieval in case-based reasoning systems and its applications for computer numerical control turret design

Research on Accuracy Analysis and Motion Control of Two-axis Non-magnetic Turntable Based on Ultrasonic Motor Journal

Identification and control of the motor‐drive servo turntable with the switched friction model

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