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Pang Z.-H.,Qingdao Technological University | Pang Z.-H.,CAS Institute of Automation | Zheng G.,CAS Institute of Automation | Luo C.-X.,Henan Institute of Metallurgy Co.
Proceedings of the 2011 6th IEEE Conference on Industrial Electronics and Applications, ICIEA 2011

Based on the strong tracking filter (STF), a STF-LQR control approach is presented for the control of a ball and beam system (BBS). The simple linearized mathematical model of the BBS is first obtained according to physics laws. In order to model the BBS accurately, an additional control action is introduced as an augmented state variable to compensate for the unmodeled dynamics, such as friction, nonlinearity, disturbance and time-varying characteristics. All the states are adaptively estimated by using the STF, and the controller is designed by employing the discrete-time LQR technique. A BBS control test rig is built based on the NetCon system. Practical experiments have been carried out to demonstrate the feasibility and effectiveness of the proposed approach. © 2011 IEEE. Source

Pang Z.-H.,Qingdao Technological University | Pang Z.-H.,CAS Institute of Automation | Zheng G.,CAS Institute of Automation | Liu G.-P.,University of South Wales | Luo C.-X.,Henan Institute of Metallurgy Co.
2011 IEEE International Conference on Cyber Technology in Automation, Control, and Intelligent Systems, CYBER 2011

With the rapid developments in computer, communication and control technologies, the networked control systems (NCSs) have been a growing trend in industrial automation systems for the purposes of distributed management and control. This paper addresses the security issues of data transmitted in NCSs under deception attacks, especially confidentiality, integrity and authenticity. Deception attacks can deteriorate the system performance or even destabilize the system. To protect NCSs from them, a secure transmission mechanism is presented in this paper, which integrates the Data Encryption Standard (DES) algorithm, Message Digest (MD5) algorithm, and timestamp strategy. DES is used to encrypt and decrypt the data exchanged between the controller side and the plant side. The MD5 algorithm and the timestamp are applied to check the data integrity and authenticity. Practical experiments to control the speed of a DC motor through the Internet have been carried out to demonstrate the feasibility and effectiveness of the proposed approaches. © 2011 IEEE. Source

Wang B.,North China University of Water Conservancy and Electric Power | Wang B.,Huazhong University of Science and Technology | Song X.,North China University of Water Conservancy and Electric Power | Wang Z.,Henan Institute of Metallurgy Co. | Zheng C.,Huazhong University of Science and Technology
Chinese Journal of Chemical Engineering

Calcium looping method has been considered as one of the efficient options to capture CO2 in the combustion flue gas. CaO-based sorbent is the basis for application of calcium looping and should be subjected to the severe calcination condition so as to obtain the concentrated CO2 stream. In this research, CaO/CaZrO3 sorbents were synthesized using the sol-gel combustion synthesis (SGCS) method with urea as fuel. The cyclic reaction performance of the synthesized sorbents was evaluated on a lab-scaled reactor system through calcination at 950 °C in a pure CO2 atmosphere and carbonation at 650 °C in the 15% (by volume) CO2. The mass ratio of CaO to CaZrO3 as 8:2 (designated as Ca8Zr2) was screened as the best option among all the synthesized CaO sorbents for its high CO2 capture capacity and carbonation conversion at the initial cycle. And then a gradual decay in the CO2 capture capacity was observed at the following 10 successive cycles, but hereafter stabilized throughout the later cycles. Furthermore, structural evolution of the carbonated Ca8Zr2 over the looping cycles was investigated. With increasing looping cycles, the pore peak and mean grain size of the carbonated Ca8Zr2 sorbent shifted to the bigger direction but both the surface area (SA) ratio Φ and surface fractal dimension Ds decreased. Finally, morphological transformation of the carbonated Ca8Zr2 was observed. Agglomeration and edge rounding of the newly formed CaCO3 grains were found as aggravated at the cyclic carbonation stage. As a result, carbonation of Ca8Zr2 with CO2 was observed only confined to the external active CaO by the fast formation of the CaCO3 shell outside, which occluded the further carbonation of the unreacted CaO inside. Therefore, enough attention should be paid to the carbonation stage and more effective activation measures should be explored to ensure the unreacted active CaO fully carbonated over the extended looping cycles. © 2014 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved. Source

Qiao Y.,CAS Institute of Automation | Liu G.-P.,University of South Wales | Zheng G.,CAS Institute of Automation | Luo J.,Henan Institute of Metallurgy Co.
IET Seminar Digest

This paper introduces a novel Web-based laboratory for the design and real-time implementation of networked control experiments. By adopting a three-tier architecture, i.e. Web-browsers, server clusters and test rigs, the laboratory connects experiment device located globally and provides control experiment options such as local control structure, Intranet-based control and Internet-based control structure. Users can design networked control algorithms in a diagram-based way and validate their algorithms using test rigs easily on the laboratory with a simple Web browser. Networked control blockset is developed to facilitate the configuration of network and the design of controller in the lab. Web-based simulation and practical experiments of networked predictive control scheme are performed to illustrate the functionality of the Web-based lab and the effectiveness of networked predictive control method. Source

Li J.,Jiangxi University of Science and Technology | Li Y.,Jiangxi University of Science and Technology | Gao Y.,Henan Institute of Metallurgy Co. | Zhang Y.,Jiangxi University of Science and Technology | Chen Z.,Jiangxi University of Science and Technology
International Journal of Mineral Processing

This paper introduces an application of chlorination roasting process followed by hot-acidulous water leaching that could cause a high extraction selectivity of Ni, Co and Mn over Fe and Mg which can concentrate Ni and Co in laterite ores. Thermodynamic analysis of possible chlorination reactions in roasting process was calculated and the Predominance Area Diagram of Ni-Co-Cl-H-O was shown to indicate the effect of partial pressure of HCl and H2O on the stability of NiCl2 and CoCl2. The mixture of NaCl and MgCl2·6H2O was selected as chloride agent and the chlorination mechanism was discussed comprehensively. The results show that the leaching rates of Ni, Co, Mn, Fe and Mg are 87%, 58%, 53%, 3.2% and 5.4% respectively at the optimal conditions, which showed that Ni, Co and Mn could be extracted effectively and the extraction of Fe and Mg was suppressed simultaneously. The Ni/Fe ratio and Ni/Mg ratio can reach 0.97% and 0.25% in leaching solution which can increase 15 times and 8 times respectively in comparison with the Ni/Fe and Ni/Mg ratio in raw ore. © 2015 Elsevier B.V. All rights reserved. Source

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