【作者】 王伟涛；

【导师】 任中全；

【作者基本信息】 西安科技大学 ， 机械电子工程， 2008， 硕士

【摘要】 本文采用LABVIEW技术,并严格按照矿用通风机系统安全检验规范,在实验和理论分析的基础上,对原系统不断进行改进和扩充,完善了基于虚拟仪器的矿用通风机性能检测系统。在对系统特性进行研究的过程中,由于整个系统比较复杂,直接从整体上研究比较困难,因此将系统分为硬件和软件两部分分别进行研究,然后从串联系统的角度出发,利用控制理论的相关知识对整个系统的特性进行了研究和评价。最后通过实验,完成了风机静压的测试和风机性能曲线的绘制。实验结果表明,该系统能达到风机测试技术手册的相关要求,简化测试工作的同时提高了测试效率和测试的可靠性。因此,该系统具有一定的实用价值。在硬件的研究过程中,首先面临硬件的选择问题,通过在西安煤检所的调研并结合我们的实际情况,对测试系统的硬件部分(测试各种参量的传感器和数据采集卡)进行了选型,并搭建了实验平台;其次在实验的基础上,利用最小二乘法对压力传感器进行了静态标定,并通过计算得出它的静态特性参数,最后利用标准信号发生器对其动态特性进行研究,得到压力传感器的动态特性方程,并计算了传感器动态响应参数。在软件系统的研究过程中,以LABVIEW语言为基础,采用模块化、层次化的设计思想和面向对象的编程方法,进一步完善了通风机性能测试系统的软件;完善后的测试系统具备了风机单项性能测试、测试数据的处理和管理、通风机性能曲线的绘制及Word报表的生成等功能。另外,采用单位阶跃响应的方法对静压测试子程序进行试验,获得静压测试子程序的响应数据,依此建立系统的数学模型,利用Laplace变换的极限定理算法,估算出假设模型的参数,得出测试系统的模型;采用自相关函数检验法对假设模型进行检验,得到无论α= 0.01还是α= 0.05,两种情况计算值均小于χ2 m,α,所以ε( k)被认为是白噪声。该检验结果表明,对系统模型的阶次估计和参数估计是合理的。综合以上结果,将传感器的动态模型与静压子程序的动态模型进行相乘,得到整个系统的数学模型:为一个比例环节与振荡环节的乘积,并利用控制理论对系统的稳定性、响应时间、工作频带、抗干扰性进行了研究。最后,在实验室对通风机虚拟测试系统进行了实验,通过改变节流挡板的角度来改变通风机运行工况,并记录风机实验数据,绘制出通风机的性能曲线。将测试结果和常规仪器的测试结果进行对比,得出该系统的各项指标能够满足风机测试的要求。更多还原

【Abstract】 The LABVIEW technology is adopted in this text, and strictly according to the standard of safety checking of mine fan system, Improve and expand the plain system unceasingly on the basic of experiment and theory-analysis, it is perfected with the function-check system of mine fan based on VI. In the research of system performance, it is very difficulty to research the system directly on the whole, because the entire system is very complicate, therefore in the process of research, The system is divided to two parts with the hardware and the software, then,from the angle of in-line system, making use of basic knowledge of control theory research and evaluate the performance of entire-system. Finally through the experiment, static-pressure testing and drawing of function-curve about fan are finished. The system is able to realize comprehensive testing of fan-performance, simplifying the job of testing, improving the safety of testing, therefore, This system has some utility value.In the process of the hardware research, it is confronted with the problem of hardware chosen first, by our reality surveying in Xi’an coal institute and being tied our reality, it is selected to the hardware part (the sensor and data-collector of testing the various parameter of testing system experiment platform is built; secondly at the basic of experiment, Static state-curve of pressure sensor is drew with the way of minimum two multiplication. and calculate its parameters on static state. Finally, Its dynamic character is researched making use of the standard signal generator and get the dynamic state-equation of pressure sensor, calculating its dynamic response parameter.With the programming language of LABVIEW, and adopting the design conception of modular、layering and the method of component oriented design, the software of fan performance inspecting-testing system was developed. The online monitoring of single performance parameter, the processing of acquired data and the management of data,, the protracting of the fan performance curve, the creating of Word-report and other functions, Besides, This paper experimented with unit-step response to static pressure testing program, obtained the response data of static pressure testing program, established the mathematic model of the system. Using the limits-theorem of the Laplace transformation, the parameters of the hypothesis model were imputed and getting the math-model of the system; the hypothesis model was tested by testing plan of the self-relation function, getting that: no matter whatαis 0.01 or 0.05,both of the result are less than theχ²_{m ,α},soε（ k） is viewed as white-noise. This result of testing indicating, the order-estimating and the parameter-estimating of the system model are rational.According to above results, multiplying the sensor dynamic model and static pressure program model, it is the mathematic model of entire system, it is the product of proportional link and oscillating link ,and make use of control-theory to analyze its stability, response time, working band and anti-interference.The experimental verification of the VI base fan test system was accomplished in the laboratory,Running condition of the fan is changed by changing the angle of baffle plate, and record the data of fan experiment. The performance curve of fan was also obtained. By comparing the testing result of VI and the testing result of common instrument, it is got that every kind of performance index of this system can satisfy the request of fan test.更多还原