Printing is a professional and highly skilled field. It requires the operator of the printing press to master the operating rules of the printing press, and to understand the internal structure and transmission principle of the machine. However, due to the limitations of funds, venues and other conditions, the relevant educational institutions currently have problems with the small number and outdated models of machines that provide practical training and demonstrations, which have affected the teaching quality of the printing profession to a certain extent. The author proposes the necessity of bringing virtual simulation technology into the teaching of printing majors, and puts forward an application plan on how to adopt virtual simulation technology.
As the country attaches great importance to the development of vocational education, the scale of vocational education continues to expand, and it has played an active role in improving China's vocational education structure and serving the economy and society. At the same time, however, the current conditions for running technical schools and the supply of teaching equipment in China's technical schools are not so satisfactory. Restricted the development of vocational education.
Strengthening the equipment construction of the training center and ensuring practical teaching time are the prerequisites and important guarantees to meet the students' training goals. Therefore, all schools have increased capital and personnel investment in training equipment and training management, and have established training rooms and training bases to provide basic guarantee for the development of training. Even so, due to funding, equipment replacement, site restrictions and expansion of enrollment, many schools still have problems with the shortage of practical training resources and inadequate practice skills of students. This will greatly reduce the students ’practical ability and employment competitiveness. Therefore, in addition to the investment of traditional equipment, schools need to make full use of modern information technology to develop virtual factories and virtual workshops, and consider using virtual technology to solve some problems in the current training.
The main problems in the printing training course
1. There are few types, outdated and outdated models of internship equipment. At present, a prominent problem in printing professional schools is poor hardware conditions, and the general school education funds are seriously insufficient, and a domestic four-color printing machine also requires hundreds of thousands or even millions, which is impossible for most schools to purchase, per student. The amount of instruments and equipment occupied is small and the grade is low. As a result, the practical training of related courses is basically unable to be provided. Some of the reluctantly provided practical training cannot meet the needs of students due to the serious shortage of equipment, and all of them have purchased a batch of equipment to use until the end of life of the equipment. The equipment of the actual production enterprise is updated very quickly, so that the students trained from the school cannot adapt to the needs of the job in a short time. It is difficult to meet the requirements of the Ministry of Education that “the base equipment maintains the production and use level of the enterprise during the same period and has a certain degree of advancementâ€.
2. The internship cost is too high, so that the practical training is formal. Although the country's current investment in vocational education is increasing, and some educational institutions are equipped with imported multicolor offset presses, due to the large cost of ink and paper consumables in practical training, practical training is often formalized.
3. The training environment in the school is inconsistent with the production environment of the enterprise. Due to the large number of specifications and models of printing equipment, general schools can only choose to be equipped with a certain model, generally the lower grade of similar equipment, the speed of equipment replacement is far less than the speed of replacement of actual work site equipment, Therefore, the aging of equipment and the single type of model are common in the school training teaching. This phenomenon leads to the fact that although the students have done the training, the training environment in the school is inconsistent with the production environment of the enterprise, and the training in the school is inconsistent with the job position, and the training effect Poor, students adapt slowly to corporate jobs.
Understanding virtual reality technology
Virtual reality technology is a technology that uses computers to fully simulate the real world. Because it can create an environment similar to the real society, it can solve the requirements of contextualization and natural interactivity of learning media, which is extremely huge in the field of education. Application prospects, it can be predicted that virtual reality will be the most promising "star" technology in the field of education after multimedia and computer networks.
Virtual reality technology uses three-dimensional modeling technology to construct a virtual three-dimensional scene that is the same as or similar to real-world objects and environments, and can respond to user input and respond accordingly to different user actions. The key technologies of virtual reality mainly include dynamic environment modeling technology, real-time 3D graphics generation technology, stereo display and sensor technology. Virtual reality technology mainly focuses on the simulation of physical characteristics of real objects, also known as visual simulation.
Virtual training bases built using virtual reality technology are mostly virtual in terms of "equipment" and "components", and new equipment can be generated at any time as needed. The teaching content can be continuously updated, so that practical training can keep up with the development of technology. At the same time, the immersion and interactivity of virtual reality enable students to play a role in the virtual learning environment and devote themselves wholeheartedly to the learning environment, which is very conducive to student skills training. Because the virtual training system has no danger, students can practice repeatedly until they master the operation skills. For example: In the virtual aircraft driving training system, students can repeatedly operate the control equipment, learn to fly the aircraft to take off and land in various weather conditions, through repeated training, to achieve the purpose of mastering driving skills.
Virtual reality in the ordinary sense requires large-scale computers, helmet-mounted displays, data gloves, cave projections, sealed warehouses and other expensive equipment. It is impossible for general education units to withstand. The lack of funds seriously restricts the research and virtual reality in the field of education application. However, with the rapid development of science and technology, there has been a diversified development trend of virtual reality technology. According to the degree of "immersion", four types of virtualization can be divided. Among them, desktop virtual reality technology is very simple and requires investment. The cost is not high, and the range of applications in the field of education is very wide. Desktop virtual reality uses personal computers and low-level workstations for simulation, using the computer screen as a window for users to observe the virtual realm. Through various input devices to achieve full interaction with the virtual reality world, these external devices include a mouse, trackball, torque ball and so on. It requires participants to use an input device to observe the virtual realm in a 360-degree range through a computer screen and manipulate objects in it, but at this time the participant lacks complete immersion because it will still be disturbed by the surrounding real environment. The biggest feature of desktop virtual reality is the lack of real reality experience, but the cost is relatively low, so it can be widely used in the field of education. In terms of software, there are many mature software platforms that can develop desktop virtual reality systems, such as MultigenVegaPrime, EONStudio, Virtools, VRML, etc.
The Effect of Using Virtual Technology on Printing Teaching
In the teaching of printing machinery, a large amount of display of the appearance, composition, and structure of the machinery is required. Traditional teaching mostly uses the method of physical (production prototype) display. The display method using virtual reality technology is widely used due to its advantages of low cost, no space limitation and good effect.
It can alleviate the pressure caused by the shortage of school equipment and backwardness to a certain extent. The virtual printing training workshop can provide a full range of training equipment that will not be damaged, and can be continuously expanded and developed. The function of the virtual training room can be continuously improved as the software maintenance is carried out. Using the virtual reality system, students can do a variety of practical training without leaving the house, and gain the same experience as the real training, so as to enrich the perceptual knowledge and deepen the understanding of the teaching content can save money for the school. Using the training in the virtual training workshop as an important supplement to actual training can enable students to obtain theoretical learning and operation training regardless of cost, number of times, and time, which can greatly reduce the consumption of paper, ink, and machine wear, and reduce the actual The cost of training.
Can avoid all kinds of dangers caused by real training or operation. Due to the high complexity and precision of the printing press, students will inevitably produce certain personal injuries and machine damage due to misuse during actual training and operation. In the virtual training environment, students can do all kinds of training with confidence. The operation safety is high, which can minimize personal injury and machine damage.
Application Scheme of Virtual Reality Technology in Printing Teaching
1. Establish a simulation model. First, modeling the printing workshop, printing machinery (external structure), etc. Use 3dsmax, Maya, MultigenCreator and other three-dimensional production software. Among them, 3dsmax and Maya have powerful modeling functions, and the detailed description of objects is very vivid, which is suitable for fine modeling of objects, but the amount of modeling data is very large; The modeling tool of the real-time roaming design of the virtual scene, and the 3D modeling software developed by Vega for a company, can be directly imported into Vega for editing, it has a good user interaction interface, the modeling speed is fast, and the model it builds is small , Will not affect the real-time nature of the virtual environment, but can not be compared with the software mentioned above in terms of fine modeling.
Second, model the main transmission mechanism inside the printing machinery. Use Pro / E, Solidworks and other mechanical 3D production software to make gears, cams, levers and other mechanical parts, and assemble them.
2. Create a virtual printing workshop scene. Use VegaPrime, EONStudio and other visual simulation software to import the model and build a virtual printing workshop.
3. Establish interaction with the virtual printing workshop. The content includes the roaming of the printing workshop, the display and disassembly of the internal parts of the printing press, the dynamic demonstration of the transmission process of some mechanisms of the printing press, and the links of related videos and animations, and the virtual basic operation of the printing press through the virtual operation panel.
The display of the appearance and structure of the device can be edited and driven by EON; the VegaPrime driver can be used to realize the virtual operation simulation of more complex interactive operation machines; the programming software such as VC should be used for the logic control of the virtual operation panel.
4. System integration. System integration is to organically integrate the above-mentioned models and scenes in the form required by the teaching software, making it a complete and standardized teaching software. System integration can use currently commonly used software development platforms such as VB, VC ++, etc. Because the above-mentioned virtual reality driver software such as EON, VegaPrime, etc. all provide running plug-ins that can be used in common software development platforms in the form of ActiveX controls, system integration becomes very convenient. When writing a program, you only need to consider the arrangement of software functions and pay attention to the compatibility between the programs.
The teaching of today's printing majors should no longer rely solely on books and teachers. We should use virtual reality technology, an advanced platform, to develop a virtual simulation teaching system suitable for teaching actual printing machinery to make up for the shortcomings of traditional teaching methods, in order to improve the current embarrassing dilemma faced by some printing professional schools and make it A qualitative leap in teaching has contributed to the cultivation of talent in the printing industry.
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