Design And Implementation Of Digital Twin Control Monitoring System For Laser Experimental Platform

Laser experimental platform is an important scientific research equipment for various laser processing research.As the laser experimental platform is mostly designed and built by the user,mature commercial experimental system solutions are not common,resulting in the overall digitalization and intelligence of the existing experimental platform is not high;and limited by the compact and complex space structure of the experimental platform itself,it is not easy to enhance the overall performance of the platform system by adding auxiliary devices.Digital twin technology is to build a digital twin model in virtual space with real-time data interaction with physical entities,and use the model to synchronously map the whole life cycle state of physical entities.Through the digital twin model,the operation of the physical device can be monitored intuitively and effectively,and at the same time,the real-time simulation of the operation data collected in real time can be used and the results can be fed back to the physical device to improve the performance of the entity.Therefore,the use of digital twin technology to upgrade traditional equipment such as laser experimental platform is of great practical significance to improve the convenience of operation,operational safety and intuitive motion monitoring of the platform.In this paper,we choose to design a digital twin control and monitoring system based on the laser experiment platform for the platform motion actuator to complete the interactive control and visual monitoring between the experiment platform and the digital twin model.The system uses the MQTT communication protocol to build a data transit network between reality and reality,and designs a virtual control panel in the Unity 3D engine,which is used as a message publishing/subscription client together with the original experimental platform control software Kinesis in the physical space after secondary development.The two clients can realize real-time interaction of data information in the virtual and real space,so that the twin model can map the behavior state of the experimental platform and improve the convenience of monitoring the platform state;at the same time,the twin model can be analyzed for collision detection according to the real-time data of the experimental platform to improve the safety of the platform when it is used.Firstly,we need to define the objectives and processes of the design scheme of digital twin control monitoring system,then analyze the functional requirements of the system and determine the overall logic framework of the scheme.At the same time,according to each function and performance requirements of the twin system in this paper,determine the system development environment,computer hardware basis and hardware conditions of physical equipment,and improve the overall system design.Secondly,functional development is carried out for the virtual and real clients in the digital twin control monitoring system.A single optical displacement platform in the laser experiment platform is selected as the hardware basis for the preliminary experiment,and the virtual and real ends constitute the communication unit with the MQTT server after the introduction of MQTT components.The digital twin model is mapped to the experimental platform in real time according to the data information,and the user can complete the synchronous interaction control between the experimental platform and the twin model through the secondary developed control software Kinesis or the virtual control panel.In the physical device side make full use of the control software.dll file for the secondary development of the underlying code of the program,by referring to the device motion control function class to ensure that the control commands can be accurately identified by the experimental platform.At the virtual engine side and the solid device side,appropriate data types are selected to meet the high-precision data transfer requirements according to the motion base units and program value type requirements of different scales,respectively,to ensure the operation accuracy of the experimental platform.Thirdly,according to the digital twin data transmission real-time requirements and the shape geometric characteristics of various types of institutional components of the experimental platform,the twin model is selected to introduce the AABB tree collision detection algorithm and design the interference envelope visualization display function.At the virtual device end,the collision detection algorithm interferes with the mechanism behavior of the experimental platform with collision risk,and the detection result will mobilize the experimental platform motion abort command and deliver it to the experimental platform through the special message distribution channel set up in MQTT to abort the platform motion in time.Finally,the digital twin control monitoring system as a whole was functionally integrated and tested for performance.The test results show that the data transfer latency of the digital twin system is low,and the data transfer time between cross-software is less than 30 ms,and the motion data can be accurately transferred and run.Meanwhile,the collision detection function and multi-view switching function of the system can run normally,and the function of each block of the human-computer interaction interface is normal.The digital twin system has a low occupancy rate of computer performance and good stability when running.