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Your search keyword '"Xu, Zhezhuang"' showing total 20 results
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20 results on '"Xu, Zhezhuang"'

1. Contouring Error Bounded Control for Biaxial Switched Linear Systems

Author

Yuan, Meng, Wang, Ye, Manzie, Chris, Xu, Zhezhuang, and Chai, Tianyou

Subjects
Electrical Engineering and Systems Science - Systems and Control
Abstract

Biaxial motion control systems are used extensively in manufacturing and printing industries. To improve throughput and reduce machine cost, lightweight materials are being proposed in structural components but may result in higher flexibility in the machine links. This flexibility is often position dependent and compromises precision of the end effector of the machine. To address the need for improved contouring accuracy in industrial machines with position-dependent structural flexibility, this paper introduces a novel contouring error-bounded control algorithm for biaxial switched linear systems. The proposed algorithm utilizes model predictive control to guarantee the satisfaction of state, input, and contouring error constraints for any admissible mode switching. In this paper, the switching signal remains unknown to the controller, although information about the minimum time the system is expected to stay in a specific mode is considered to be available. The proposed algorithm has the property of recursive feasibility and ensures the stability of the closed-loop system. The effectiveness of the proposed method is demonstrated by applying it to a high-fidelity simulation of a dual-drive industrial laser machine. The results show that the contouring error is successfully bounded within the given tolerance.

Published
2024

10. Improving AOA Accuracy in BLE-Based Localization With a Hierarchical Estimation Framework and Phase Correction Mechanism

Author

Yuan, Yazhou, Liu, Cheng, Zhou, Lili, Xu, Zhezhuang, Liu, Zhixin, and Ma, Kai

Abstract

With the rapid development of the Internet of Things (IoT) technology, location-based services (LBSs) are gaining significant attention for their potential applications. Among the various LBS methods, angle of arrival (AOA) is attracting attention due to its simplicity and ease of implementation. However, in practical applications, the Bluetooth low-energy (BLE)-based 2-D antenna array encounters the problem of constant tone extension (CTE) frequency deviation (FD), which introduces phase impairments. Additionally, the support of periodical advertising (PA) event in Bluetooth poses a challenge for ensuring excellent angle estimation performance in periodic physical (PHY) channels, as the channel overlaps with the Wi-Fi frequency band. To address these challenges, we propose a hierarchical angle estimation (HAE) framework based on the phase difference of single reference antenna. The framework comprises three layers: the data acquisition layer, the phase restoration layer, and the multichannel estimation layer with angle collection solver. The HAE framework enables phase correction and accurate estimation over periodic PHY channels. We validate the proposed method on a real hardware system and demonstrate that it achieves a high level of precision and stability in the estimation of angles, which makes it suitable for practical LBSs applications in challenging environments.

Published
2024
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