Research on Surveying and Mapping Assembly Experiment Based on Virtual Reality Simulation
0 Preface
The combination of teaching theory and practice of engineering graphics courses is very important, especially the cultivation of students' hands-on and innovative ability. It is a theoretical and practical course, so the experimental teaching link is essential to learn this course well. Only by strengthening the practice teaching link can students truly understand and master the theoretical knowledge of the subject.
The teaching of engineering graphics courses is very specific. It pays attention to the movements and movements of institutions. Due to the lack of real feelings in theoretical teaching, students often feel dull and difficult to understand when they attend classes; most of the experimental equipment in mechanical courses Very expensive, in some cases, the corresponding experimental requirements cannot be fully met, especially for each student, the student experiment is usually grouped, for some experiments, when the experimental equipment is few, the number of grouping will be large, so the students are doing There will not be many opportunities for proficiency in the experiment; therefore, if you can carry out virtual simulation experiment teaching in teaching, not only can you make up for the lack of experimental resources to a certain extent, but also can improve students' ability to observe problems, analyze problems and solve problems, Seeking to master a professional technical skill.
1 The practical significance of applying virtual simulation experiments in teaching
At present, most domestic universities still use traditional methods, that is, the teacher explains and demonstrates, and then the students themselves do it. And foreign countries have switched from traditional experiments to the combination of physical experiments and virtual experiments, making full use of advanced computer equipment for virtual simulation experiment teaching, and achieved good results.
The traditional teaching model is teacher-centered, and the transfer of knowledge mainly depends on the indoctrination of students by the teacher. As the cognitive subject, students are in a passive state throughout the teaching process. Their initiative and enthusiasm are difficult to exert, which is not conducive to the cultivation of student divergence. Thinking, critical thinking and creative thinking are also not conducive to the cultivation of creative talents. Virtual simulation experiment breaks through the limitation of traditional teaching methods. Students do it by themselves and participate in the operation of the whole experiment process in person. By expressing the actual production process in vivid forms such as images and animations, they can enhance the students' perceptual knowledge and interest in learning, improve the teaching effect, and make their practical ability and observation Ability and inductive ability are well trained. Virtual experiment technology creates a personalized learning environment, enabling students to learn in a natural and interactive atmosphere. Based on the above thinking, try to use "virtual simulation experiment teaching" in the teaching of "Engineering Graphics" to explore the teaching reform.
2 Design goal of virtual simulation experiment
The development tools of virtual experiment are mainly network virtual reality modeling language (VRML) and 3D modeling software. VRML is a scene modeling language used to build real-world scene models or people fictional three-dimensional worlds. The basic goal of VRML is to establish interactive virtual objects, scenes, and 3D models on the Internet. The basic features include distributed, 3D, interactivity, multimedia integration, realism, etc. It is currently a 3D interactive website based on "www" on Internet The mainstream language produced.
The design of the virtual reality system should achieve the following goals:
a) To enable participants to have a "real" experience. This kind of experience is "immersion" or "investment", that is, to enter wholeheartedly, which is simply an illusion generated in the virtual world. The ideal virtual environment should be such that it is difficult for users to distinguish between true and false, or even "true" than true. The significance of this immersion is that it can make the user focus. In order to achieve this goal, it must have multi-perception capabilities. An ideal virtual reality system should have all the perceptive capabilities that humans have, including sight, hearing, touch, and even taste and smell.
b) The system should be able to provide convenient and rich human-computer interaction means mainly based on natural skills. These methods enable participants to manipulate the virtual environment in real time, get feedback information from the virtual environment, and enable the system to understand the position, state, and deformation of the key parts of the participants. Real-time is very important. If there is a large delay in the interaction and it is inconsistent with people's psychological experience, it is impossible to talk about interaction with natural skills, and it is difficult to obtain an immersion.
3 Virtual auxiliary teaching of parts and components surveying and mapping practice
The "Engineering Graphics" course is a major technical basic course for mechanical majors, and it is a course with strong theoretical and practical aspects. Therefore, the experimental teaching link is essential to learn this course well. Only by strengthening the practice teaching link can students truly understand and master the theoretical knowledge of the subject. The implementation of this project is mainly to use inventor 2008, 3D max, AutoCAD and vrml software system to design a virtual experiment system, so that it can assemble the gear oil pump (Figure 1), reducer (Figure 2), vice (Figure 3) Carrying out dynamic simulation and dynamic simulation of the assembly process through vivid forms such as images and animations can give full play to the students 'subjective initiative, help students gain a rich perceptual understanding, and stimulate students' interest in asking questions and seeking solutions to problems. It is used to broaden students' knowledge and effectively support theoretical learning.
The practice of virtual assisted teaching technology for parts surveying and mapping is to use physical models as the basic elements, take physical model surveying and mapping as the main line, and use computer virtual reality to create intuitive images mainly in the form of drawings and animations to analyze the shape of parts. Structure and mapping process. [
The process of integrating virtual auxiliary teaching into surveying and mapping practice teaching is: arranging surveying and mapping tasks; observation and analysis of physical models; teachers based on physical models through virtual auxiliary teaching courseware centralized guidance; students based on physical models, refer to virtual auxiliary teaching courseware autonomous surveying and mapping; teachers concentrated assessment .
The main component of virtual auxiliary teaching is based on virtual images, equipped with electronic documents with a small amount of text description. They are: a picture set that mainly expresses the shape and structure of parts, an image set that mainly analyzes the shape and structure of the parts and a view analysis, and a picture set that mainly focuses on the method and process of component mapping, and A collection of drawings based on size, technical requirements, drawings, and job requirements.
4 Features of virtual assisted teaching technology for parts and components surveying and mapping practice
a) Entity-based virtualization. Computer virtual reality and virtual 3D graphics are closely related to configuration thinking and vision and visual psychology. Practice has shown that without the physical model as a benchmark and without the support of configuration thinking and vision and visual psychology, computer virtual reality and virtual 3D graphics will become meaningless works; on the other hand, there is no knowledge of configuration thinking and vision and visual psychology. Instructing the creation of computer virtual reality and virtual three-dimensional images, works with good results cannot be obtained.
b) Selection of surveying and mapping objects (parts and components) based on the quality of graphics. Choosing good surveying and mapping objects is the first condition to guarantee the teaching effect of zero and component surveying and mapping. Simplification and overcomplication are both undesirable, and may cause damage to the overall teaching of the university. The first factor in selecting surveying and mapping objects (zeros and parts) is to consider the requirements for the cultivation of students' graphics quality, and secondly to consider the needs of subsequent courses. Valves, pumps, fixtures (vises), and reducers are frequently selected objects for surveying and mapping. The main reason is to facilitate teaching. According to the requirements of the cultivation of graphics quality, the surveying and mapping contents of the selected parts and components should cover as much as possible the main core content of graphics. For example, the expression method is typical and comprehensive, and the structure is representative. According to the needs of the follow-up lessons, the surveying and mapping content of the selected parts and components should contain the main elements of the follow-up lessons.
5 Conclusion
The development of virtual surveying and mapping assembly experiments of parts and components is to broaden the experimental teaching platform, improve surveying and mapping methods, improve the efficiency and quality of surveying and mapping, and reduce the teaching burden. The core of this teaching technique involves all aspects of traditional surveying and mapping, as well as the deep theoretical and technical issues of modern educational technology. Of course, the virtual simulation experiment cannot completely replace the physical experiment, but it can be explored as a supplement to the physical experiment and classroom theoretical teaching.
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