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阀体气密性智能检测与监控系统的研发
论文作者:童鞋论文网  论文来源:www.txlunwenw.com  发布时间:2019/9/26 10:26:45  

摘要:阀体气密性检测是阀体生产的重要环节,阀体气密性优劣事关人民财产和生命安全。针对现有气密性检测设备所存在的问题,研发了一种融合PLC、人机交互、图像检测和交流伺服驱动等先进技术为一体的阀体气密性智能检测与监控系统,其研究内容和成果如下:

(1)根据现有阀体气密性检测控制系统存在的问题,提出了以伺服电机全闭环控制系统代替原来交流电机变频调速系统的设计方案,并完成了系统电气和气动控制系统的设计和选型;基于STEP 7 MicroWIN SP9平台对下位机完成了编程设计,最终实现了阀体气密性检测过程的手动/自动控制及正常运行;

(2)针对交流伺服控制系统稳定控制及控制指标的要求,提出了基于PSO优化的模糊PID复合控制的方法,实现了对左右传动机构平台交流伺服系统的精确定位控制,使得定位精度达到0.5mm。仿真和模拟实验结果验证了控制算法的有效性;

(3)针对两摄像机气泡图像存在遮挡、光照变化等干扰问题提出了基于SIFT算法结合改进的SUSAN算子的图像匹配拼接算法,基于MATLAB平台仿真验证了该算法的可行性,结果表明,该算法提高了视觉气泡检测的鲁棒性与检测效率。通过实验验证了该方法在保证检测准确性的同时,可缩短检测时间,提高气泡检测效率,解决了图像遮挡、光照变化以及图像干扰信号对气泡检测的影响,可检测泄漏点的范围。

(4)基于SIMATIC Winccflexible 2008平台设计了阀体气密性检测设备友好的人机交互系统。人机交互界面主要包括:用户登录、手动和自动模式、检测过程实时动画、水箱水位变化实时画面、压力变化趋势图、阀体数据库管理、气泡图像处理系统等,实现了阀体气密性检测设备智能监控系统的设计,通过离线仿真检验证明了系统的可行性,达到了厂家阀体气密性检测与过程监控的要求。与该研究相关的课题通过了由中国机械工业联合会组织的鉴定,认定达到了“国内先进水平”。

The airtightness detection of the valvebody is an important part of the valve body production. The airtightness of thevalve body is related to the people's property and life safety. Aiming at theproblems existing in the existing airtightness testing equipment, a valve bodyairtight intelligent detection and monitoring system is developed. Itintegrates PLC, human-computer interaction, image detection and AC servodrive.  The research contents and resultsare as follows:

(1) According to the existing problems ofthe valve body air tightness detection and control system, the design scheme ofreplacing the original AC motor frequency conversion speed control system withthe servo motor full closed loop control system is proposed, design andselection of the system electrical and pneumatic control system is completed;Based on the STEP 7 MicroWIN SP9 platform, the programming of the lowercomputer is completed, and the manual/automatic control and normal operation ofthe valve body air tightness detection process are finally realized.

(2) Aiming at the requirements of thestability control and control index

of AC servo control system, a fuzzy PIDcomposite control method based on PSO optimization is proposed, which realizesprecise positioning control of the AC servo system of the left and righttransmission mechanism platform, so that the positioning accuracy reaches0.5mm. Simulation and simulation results verify the effectiveness of thecontrol algorithm.

(3) The image matching splicing algorithmbased on SIFT algorithm combined with improved SUSAN operator is proposed forthe interference of two camera bubble images, such as occlusion andillumination variation. The feasibility of the algorithm is verified bysimulation based on MATLAB platform. The results show that the proposed algorithmimproves the robustness and detection efficiency of visual bubble detection.Theexperimental results show that the method can shorten the detection time andimprove the bubble detection efficiency while ensuring the detection accuracy.It can solve the effects of image occlusion, illumination changes and imageinterference signals on bubble detection, and can detect the range of leakpoints.

(4) Based on the SIMATIC Wincc flexible2008 platform, a human-computer interaction system with friendly valve bodyairtightness testing equipment is designed. The human-computer interactioninterface mainly includes: user login, manual and automatic mode, real-timeanimation of detection process, real-time screen of water level change of watertank, pressure change trend graph, valve body database management, bubble imageprocessing system, etc., which realizes valve body air tightness detection Thedesign of the equipment intelligent monitoring system proves the feasibility ofthe system through offline simulation test, and meets the requirements ofmanufacturer's valve body air tightness detection and process monitoring. Thesubject related to the research passed the appraisal organized by the ChinaMachinery Industry Federation and was found to have reached the “Domesticadvanced level”.

关键词:阀体气密性检测;交流伺服控制系统;SIFT气泡检测;遮挡和光照变化;人机交互监控系统

valve body air tightness detection; ACservo control system; SIFT bubble detection; occlusion and illuminationchanges; human-computer interaction monitoring system

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