基于现场总线的智能阀及其信号提取与二线传输模式研究
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摘要
各种电液阀作为一类重要的执行器件，保证其安全稳定的运行意义重大，因此需要对阀的运行状态信息进行有效提取和实时监控，以及在出现故障时报警并做出相应的应急处理。随着整个控制系统规模的扩大及网络结构的复杂化，监控网络还需满足系统对简化网络拓扑、提高控制智能以及系统的开放性和控制功能的分散化的要求。正是基于这样一种背景，在综合国内外公开文献的基础上，我们提出了基于电力线载波传输和CEBUS现场总线的智能二线阀系统的概念，并对其相关关键技术进行了基础研究。
所研制的智能二线阀之关键技术可分为阀信息提取、二线阀研制、二线信息双向传输等几个方面。
论文首先对液压阀卡涩、卡紧这一类重要故障现象进行了机理分析和建模，提出了基于电反射的无传感器检测新方法，并通过仿真和具体实验对其有效性进行了验证。实验结果表明该方法对卡涩、卡紧故障有较好的识别能力，有良好的工程应用前景。
随后，论文对基于MCU的智能二线阀单元模块的设计进行了深入研究，提出了MCU、CEBUS现场总线、电力线载波通讯模块相结合的智能二线阀单元模块系统构架，并对一些具体的技术难题作了实践性研究，给出了解决方案。其中，我们提出的一种无变压器方式的电力三通，给电力线耦合方式提供了一条新的思路。对该智能二线阀单元模块的实验测试表明该二线阀单元模块其性能令人满意。
在实验中我们发现电力线信道特性的变化对智能二线阀系统的性能有着比较明显的影响，从研究的系统性出发，同时，也是作为从物理实践到理论研究的一个重要步骤，我们在第四章中对电力线信道建模和电力线载波通讯进行了仿真研究。文中我们参考传输线理论和无线传输信道建模中的相关技术，建立了电力线阻抗模型和电力线多线瑞利衰落模型。并对三种主要载波技术在电力线上的传输性能进行了仿真研究，给出了仿真结果，该基础研究对国内同行有较大的参考价值。
As an important executive device, the hydraulic valve's safe and stable operation is of momentous significance. So real-time monitoring of the valve's running status and dynamically setting of its running parameters are needed. Also the valve should alarm and handle failure when error occurs. With the expanding of the whole control system, the control network structure is becoming more and more complex. The demand for simplify network topology, enhance the control intelligence and system compatibility, distribute the control function is growing. Under such background, we propose a new intelligent two-wire valve system based on power-line carrier communication and CEBUS.
The key techniques involved in the intelligent two-wire valve are valve information abstraction, valve development, application research of CEBUS, power-line modeling and research of power-line communication technique.
We first analysis and model the stick failure of hydraulic valve and propose a new non-sensor detection method. We verify its validity by simulation and practical experiments. The experiment shows that this method can well identify the stick failure and do pre-diagnose. The method also can be used to detect oil pollution degree.
Then the MCU based intelligent two-wire valve hardware design is studied. A hardware platform combining MCU, CEBUS and power-line communication module is described, and several technical issues are discussed and their practical solutions are provided. The practical experiments of the designed intelligent two-wire valve present a good preferment.
We model the power-line channel in chapter 4 as the experimental result shows that the power-line channel condition has civilizing influence upon the valve's communication performance. Here, we establish power-line resistance model base on theory of transmission line. We also establish power-line fading model refer to the wireless channel model. The simulation results and the experimental results indicate the model is well fit to the real power-line.
Based on the power-line channel model, we analysis and simulate the performance of the varies communication technique under the real power-line circumstance. We point out that the high voltage power-line carrier communication technique is not fit to the low-power carrier communication circumstance. We also derive and analysis the BER performance of FSK modulation system with different amplitude narrow band disturbance under different SNR. Analysis of // non-linear frequency modulation is provided corresponds to our practical experiment.
所研制的智能二线阀之关键技术可分为阀信息提取、二线阀研制、二线信息双向传输等几个方面。
论文首先对液压阀卡涩、卡紧这一类重要故障现象进行了机理分析和建模，提出了基于电反射的无传感器检测新方法，并通过仿真和具体实验对其有效性进行了验证。实验结果表明该方法对卡涩、卡紧故障有较好的识别能力，有良好的工程应用前景。
随后，论文对基于MCU的智能二线阀单元模块的设计进行了深入研究，提出了MCU、CEBUS现场总线、电力线载波通讯模块相结合的智能二线阀单元模块系统构架，并对一些具体的技术难题作了实践性研究，给出了解决方案。其中，我们提出的一种无变压器方式的电力三通，给电力线耦合方式提供了一条新的思路。对该智能二线阀单元模块的实验测试表明该二线阀单元模块其性能令人满意。
在实验中我们发现电力线信道特性的变化对智能二线阀系统的性能有着比较明显的影响，从研究的系统性出发，同时，也是作为从物理实践到理论研究的一个重要步骤，我们在第四章中对电力线信道建模和电力线载波通讯进行了仿真研究。文中我们参考传输线理论和无线传输信道建模中的相关技术，建立了电力线阻抗模型和电力线多线瑞利衰落模型。并对三种主要载波技术在电力线上的传输性能进行了仿真研究，给出了仿真结果，该基础研究对国内同行有较大的参考价值。
As an important executive device, the hydraulic valve's safe and stable operation is of momentous significance. So real-time monitoring of the valve's running status and dynamically setting of its running parameters are needed. Also the valve should alarm and handle failure when error occurs. With the expanding of the whole control system, the control network structure is becoming more and more complex. The demand for simplify network topology, enhance the control intelligence and system compatibility, distribute the control function is growing. Under such background, we propose a new intelligent two-wire valve system based on power-line carrier communication and CEBUS.
The key techniques involved in the intelligent two-wire valve are valve information abstraction, valve development, application research of CEBUS, power-line modeling and research of power-line communication technique.
We first analysis and model the stick failure of hydraulic valve and propose a new non-sensor detection method. We verify its validity by simulation and practical experiments. The experiment shows that this method can well identify the stick failure and do pre-diagnose. The method also can be used to detect oil pollution degree.
Then the MCU based intelligent two-wire valve hardware design is studied. A hardware platform combining MCU, CEBUS and power-line communication module is described, and several technical issues are discussed and their practical solutions are provided. The practical experiments of the designed intelligent two-wire valve present a good preferment.
We model the power-line channel in chapter 4 as the experimental result shows that the power-line channel condition has civilizing influence upon the valve's communication performance. Here, we establish power-line resistance model base on theory of transmission line. We also establish power-line fading model refer to the wireless channel model. The simulation results and the experimental results indicate the model is well fit to the real power-line.
Based on the power-line channel model, we analysis and simulate the performance of the varies communication technique under the real power-line circumstance. We point out that the high voltage power-line carrier communication technique is not fit to the low-power carrier communication circumstance. We also derive and analysis the BER performance of FSK modulation system with different amplitude narrow band disturbance under different SNR. Analysis of // non-linear frequency modulation is provided corresponds to our practical experiment.
引文
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