Application of the hottest virtual prototype techn

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A preliminary study on the application of Virtual Prototype Technology in engineering vehicles

I. Introduction

virtual prototype technology is a digital design method based on the computer model of products. This technology is supported by computer simulation and modeling technology, and integrates many advanced manufacturing technologies such as intelligent design technology, concurrent engineering, simulation engineering and network technology. Its ultimate goal is to realize the performance of products before product processing Manufacturability, etc., so as to evaluate and optimize the design scheme. The lmex index representing the overseas metal market closed at 3137.20 to achieve the optimization of products. Compared with the traditional design method of developing physical prototype, using the virtual prototype technology in February 2013 to develop virtual products has great advantages. Virtual prototype can replace physical prototype to carry out innovative design, testing and evaluation of products, which can shorten the development cycle, reduce costs and improve product design quality. As a national large-scale enterprise, Anhui Forklift Group Company has made some useful explorations in this regard. Based on the forklift production and manufacturing of Anhui Forklift Group, this paper expounds the frame structure, workflow and related technologies of the virtual prototype design of engineering vehicles

second, the basic connotation of virtual prototype technology of engineering vehicles

the development of new engineering vehicles should be restricted by many aspects, such as safety, reliability, comfort, aesthetics, manufacturability and maintainability. In the virtual design environment, the advantages of visualization are used to integrate technical design, component assembly, structural analysis and performance optimization in the computer virtual reality environment. The overall layout of the vehicle appearance and some characteristics such as motion constraints and accessibility are comprehensively considered to carry out interactive and rapid modeling and analysis of product geometric dimensions, technical performance, production and manufacturing, The generated model can be manipulated and modified directly, and the data can be reused

III. architecture of engineering vehicle virtual prototype engineering

forklift truck is a typical engineering vehicle with mechanical, electrical and hydraulic integration. The architecture of its virtual prototype engineering system is shown in Figure 1: it is composed of four parts: collaborative design support platform, product model, virtual prototype (VP) engine and virtual reality (VR) visual environment. The collaborative design support platform provides a collaborative design environment, including integration platform/framework, project management and other tools. The product model includes forklift system product main model, mechanical subsystem model, electronic subsystem model, hydraulic subsystem model, control subsystem model and software subsystem model. The product master model is responsible for the design of the product at the system level and the modeling of the appearance, function and performance of the prototype, such as the modeling and Simulation of the dynamics and kinematics of the prototype. The VP engine includes cax/dfx tool sets in various fields, simulates the appearance, function, performance and environment of the prototype, and sends the generated data into the VR visualization environment to display the virtual prototype from the appearance, function and various behaviors in the virtual prototype environment

Figure 1 the architecture of forklift virtual prototype

IV. the development process of engineering vehicle virtual prototype

the development process of virtual prototype is shown in Figure 2. From product demand analysis to evaluation and testing, the virtual prototype of the product is constructed in the virtual environment by using relevant product development tools. This is a cyclic and progressive process. Based on the development requirements of the product, the corresponding simulation analysis tools are used to simulate and analyze the function and performance of the virtual prototype, and the behavior of the virtual prototype. Based on the results of the simulation analysis, the virtual prototype that meets the expected design goals of the product is developed through repeated modeling/simulation analysis and model improvement throughout the life cycle of the product

Figure 2 general process of virtual design

v. key technology of engineering vehicle virtual prototype

1. The overall technology of virtual prototype engineering

virtual prototype manufacturing technology has developed very rapidly. At present, although it is difficult to realize the development system of digital products that can support the whole process of product design, virtual prototype engineering, as a huge system engineering, has some commonalities on the whole. The overall technology of virtual prototype engineering starts from the inevitable overall situation, solves the problems related to the overall situation of the system, considers the relationship between the various parts of the virtual prototype engineering, stipulates and coordinates the operation of each part of the system, and forms them into an organic whole to realize the sharing of information and resources, so as to achieve the overall goal. The design of virtual prototype mainly includes the following parts: Determination of preliminary design scheme, conceptual design, detailed design, simulation analysis and structural optimization design. Each part is designed in parallel by different designers, and the functional activities of each part have a lot of interdependent relationships. In order to ensure the collaborative work of product development teams and realize the information exchange and sharing of group activities in a distributed environment, the design process must be dynamically adjusted and monitored, and a suitable working environment for concurrent design must be constructed to ensure the smooth progress of concurrent design, This is the key to shorten the development cycle of virtual prototype. The overall structure of the virtual prototype of engineering vehicles (taking forklift as an example) is shown in Figure 3

Figure 3 overall structure of virtual design

2. Vehicle Conceptual Design and scheme evaluation in virtual environment

conceptual design and scheme evaluation of vehicles in virtual prototype environment is the preliminary work to realize virtual prototype. Under the conditions of good virtual reality roaming characteristics and real-time interaction provided by computer virtual reality environment, relevant personnel can evaluate and modify the models established by the virtual system, including visual effects. At this stage, the assembly process of the vehicle can be simulated to solve the accessibility and assemblability between various components. Through the direct assembly operation of parts, the operability of parts, the difficulty of assembly and the assembly order can be tested; Virtual testing can be carried out without consuming actual processing time and raw materials. Through the design, processing and assembly of virtual prototype, we can quickly calculate the cost of various schemes of products and formulate a reasonable production management scheme

3. concurrent engineering of virtual prototype technology

virtual prototype technology supports concurrent design, which enables the work of all links to be carried out at the same time, greatly shortens the product development cycle, speeds up the pace of product design, avoids unnecessary mistakes and risks, and can effectively reduce production costs. Engineers can combine new materials, new structures and new processes to try to carry out virtual prototype design, so as to enhance the flexibility of vehicle design and improve the quality of vehicles. The core of concurrent engineering is concurrent integrated design, which emphasizes that product design and its related processes are carried out at the same time, that is, in the design stage, the links involved in later stages such as manufacturing and assembly should be considered. Enterprises implement the parallel operation mechanism, which requires multiple tasks of design, manufacturing and other processes to be carried out alternately, so as to reduce the repetition of design. The synergy of concurrent engineering makes all departments coordinate their work, and can evaluate many schemes timely and accurately, so as to achieve the optimal scheme. The concurrent process of virtual design of engineering vehicles is shown in Figure 4

Figure 4 parallel design of virtual design

4. Optimization design of virtual prototype engineering

the ultimate purpose of design is to obtain an optimal scheme that meets various requirements, which is the engineering optimization problem. Practice has proved that optimization design is an effective design method to ensure the excellent performance of products, reduce the weight or volume of structures, and reduce costs

5. Integrated simulation and data coordination of virtual prototype engineering

system integration and simulation is a difficulty for enterprises to realize virtual manufacturing, and it is also an important factor for enterprises to speed up the realization of virtual manufacturing. 6. Looking forward to manufacturing in 2018. System integration and simulation require a lot of technical support. It is necessary to consider the relationship between subsystems from the overall situation and study the interface relationship between subsystems. It is a process of multi domain simulation software collaboration. However, it is difficult for general enterprises to purchase complete software systems for system simulation analysis

Anhui Forklift Group Company has also encountered similar problems. However, the company has made some useful attempts on the basis of existing conditions. The key to realize this link is the data coordination and data integration between subsystems. If you do this, you can make a difference. The interface implementation and data integration communication in different systems are introduced by taking the combination of the three-dimensional design Software Solidworks now used by the company and the self-developed parameter design software as an example. We use parameter design software to obtain accurate parameters of forklift parts. The purpose of combining parameter design software with three-dimensional design software SolidWorks is to reflect the parameters calculated by parameter design software in three-dimensional design, so that performance analysis and improvement can be carried out. This requires data communication between parametric design software and 3D design software. Although there is no direct communication interface between parametric design software and 3D Design Software Solidworks, they have an interface with Microsoft Excel software. We use Microsoft E6. Before starting, we must ensure that the grounding wire is properly connected. The form of Xcel software is used as the media for data storage, and Microsoft Excel software is used as a bridge to realize data sharing. The specific method is that the parameter design software calculates the parameters of a certain part, automatically stores them in the form of Microsoft Excel software, and then directly embeds this form into SolidWorks. The data in the form corresponds to the size that needs to be changed in the entity model, and the entity model is automatically changed through the change of the data in the form (as shown in Figure 5), so as to realize the communication between different data modules

Figure 5 Schematic diagram of data communication between systems

VI. conclusion

this paper introduces several frameworks for the application of virtual manufacturing technology in engineering vehicles. Virtual prototype is an emerging technology based on product process development. It is a comprehensive technology integrating intelligent design technology, concurrent engineering, simulation engineering, network technology and other advanced manufacturing technologies. It runs through the design, development, production Throughout the life cycle of the assessment. The introduction of virtual prototype can not only quickly improve the competitiveness of enterprises, but also stimulate the development of technology. The emergence of virtual technology provides an opportunity for the progress of traditional industry, but it is also a long exploration process. There is still a lot of work to be done to realize comprehensive virtual manufacturing

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