Dynamic Volume Detection System Of Cuboid Package Based On Permanent Magnet Synchronous Motor

In recent years,e-commerce and online shopping have achieved vigorous development,and the domestic logistics and express industry is also developing rapidly,which has led to the application of a large number of automation and intelligence and other high-tech technologies to logistics and transportation.In logistics,express delivery and e-commerce warehousing,the volume of cuboid parcel needs to be measured in the process of collecting,warehousing,sorting and transferring,while traditional manual measurement method using tape measure,ruler,caliper and other traditional tools to measure the volume of cuboid package is inefficient,and surveyors are easy to feel tired due to long-term simple and repeated operations,and susceptible to the damage degree of measuring tools;the measurement method of cuboid package volume based on depth image collects multiple images of packages to be measured by multiple binocular cameras to reconstruct the three-dimensional surface shape of the package and obtain the length,width and height,this method is susceptible to the influence of reflective substances attached to the surface such as adhesive tape,the need to focus the camera when using at the same time will cause the measurement rate to decline and the processing algorithm is complex,so it can not adapt to the development of domestic logistics industry;in the static volume measurement method based on 3D camera,it is necessary to place the cuboid package in the package detection area through manual interference and take the package away manually after the detection.This kind of measurement method also causes the decrease of measurement efficiency due to the participation of human.Therefore,this paper studies the dynamic measurement of cuboid package volume in logistics transportation,and designs a set of dynamic measurement system of cuboid package volume based on permanent magnet synchronous motor servo system.The main research contents are as follows:(1)It takes some time for the point cloud to be collected for Visionary-T,so the location and transport of the rectangular package in the dynamic measurement of the rectangular volume need to be completed.So that the rectangular package can be transported to the measuring area directly below Visionary-T for Visionary-T collection point cloud for subsequent processing.In this paper,the 4)= 0 vector control strategy is used to realize the permanent magnet synchronous motor servo system to complete the positioning and transmission of the cuboid package.The simulation of the permanent magnet synchronous motor servo system based on the 4)= 0 vector control strategy is carried out in Matlab/Simulink.The changes of the volume and weight of the cuboid package are simulated by changing the load of the motor.The simulation results show that the servo system has good accuracy,stability,robustness and dynamic performance.(2)The GUI interface of cuboid package volume measurement program is developed by using Swing controls in Java.The volume measurement algorithm is mainly developed by Matlab and implemented by Java language.The main processes of the algorithm include the calculation of the height of the cuboid envelope,the fitting of the convex hull of the point cloud on the surface of the cuboid envelope,the noise filtering of the outlier convex hull point cloud and the calculation of the minimum area of the outer rectangle of the convex hull.The simulation experiment of cuboid volume measurement is carried out in the laboratory,the height and orientation of the Visionary T were adjusted and a green conveyor belt was placed just below the Visionary-T to simulate the volume measurement environment for the Visionary box with strips of different colors on it.Experimental results show that the algorithm can adapt to different environmental conditions and meet the requirements of system measurement accuracy.