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Eight points analysis on the design of electric vehicle's modeling

Eight points analysis on the design of electric vehicle's modeling

2017-06-16 14:36

The automobile modelling design is promotes the automobile market the important competition method, the big company will use the frequent replacement vehicle method to obtain the consumer's favor, wins in the competitor. The automobile modelling design is the first link in the automobile development, and occupies the more and more important position in the whole automobile design process.

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New product development is a series of decision-making processes from the research selection to the product design and process manufacturing design to the production of the product. According to the depth of development of different, new product development is also divided into four levels, S1 level development is the simplest, S4-level involved in the development of the most complete content.
 
Classification of the depth of new product development in automobiles
 
According to the different development methods, product development can be divided into two main approaches: reverse development and forward development. Reverse development starts with prototype vehicle alignment, which is derived from passive imitation of prototype vehicle products. Forward development began in the early stage of product planning, from the initiative to develop a of what kind of products.
 
The reverse development has less input, lower cost and short development cycle, and is suitable for the initial development stage to solve the problem of product and No. At present, most of the low-speed electric vehicle enterprises are imitating the road, and then on the basis of the reverse development of the platform model of S1-level depth of product development. For example, the most common types of Mercedes-Benz models in the market, are on the basis of the Ben-Ben platform on the front and rear bumper, headlights, or interior modification of the variant products.
 
Forward development is the inevitable trend of the future development of Low-speed electric vehicle, and it is impossible to rely on the individual's power, to a great extent, to rely on the scientific Organization procedure and standardization of the development of sculpt design. The current weekly report will provide an overview of the modeling process and related links of the positive development models.
 
Market Analysis and positioning
 
New car development first of all to carry out product feasibility analysis and product target market research, the main tasks are as follows:
 
(1) Consumer research: including the lifestyle, hobbies, values, consumption, outlook on life, and the use of cars.
 
(2) Competitive analysis and positioning: to identify the design direction and positioning by analyzing the existing similar vehicles and the future products of other enterprises that may form a competitive relationship.
 
(3) Product positioning: Through the design of the previous survey, to determine the target audience's use and aesthetic needs, as well as functional positioning.
 
(4) Style determination: Product design leader to convene relevant designers to discuss and determine the product style, image and shape design direction.
 
(5) To develop a preliminary technical plan: by calculating the technical specifications and expected performance parameters of the selected vehicle, and to analyze whether the technical process means can be adapted to the technological level and technological capability of the enterprise.
 
(6) Financial Analysis: Analysis of factors such as cost control to predict whether the product can bring profits for the enterprise.
 
2. General Layout Design
 
The general layout design is the foundation of the design, the general layout of the vehicle to determine the main size and basic shape, for the design designer's ideas and play a set of hard points, so that the shape of creative design can be targeted.
 
General layout design through the overall planning of the vehicle design to determine the body, chassis, powertrain and other systems between the configuration of the relationship, weight, regulation and vehicle performance indicators. At present, most of the general layout design adopts the digitized three-dimensional design. Low-speed electric vehicle enterprises can make appropriate changes and local improvements on the basis of the existing mature overall arrangement, which can simplify the workload and shorten the development cycle.
 
3. Originality and sketch Design
 
Stylist According to the general layout of the design of the size and basic shape, into their own models of understanding and view, sketch out the specific image of the car. At this stage, designers can throw away many constraints in reality, develop ideas and give full play to their own imagination, which helps to create new ideas and good ideas, and is conducive to innovative design of products.
 
The most direct and quick way to express creativity is to sketch. At this stage, designers should use divergent thinking to open their own vision of design, from different points of view different design styles to find inspiration. Early sketches tend to have designers ' uncertain ideas, lack of scrutiny, more casual and relaxed, and need to be screened.
 
4. Effect chart
 
After the creative phase gets the general design direction, the design of the effect diagram is selected from many design sketches, including various modeling details and structure. The effect chart is used to guide the clay model, the digital model and the scheme presentation, which requires precise results. This time can not be completely unrestrained, to consider the market aesthetic, price, process and other factors. For a newly developed model, the effect of 6-9 options is generally provided for design review, from which 2-3 schemes are selected to enter the next step in the design of the proportional sludge model.
 
5. Initial number model
 
After the production stage of the effect graph is completed, a three-dimensional model is needed to refine and display the modeling. Digital Designer According to the effect diagram, with the help of three-dimensional modeling software to build a digital model, this digital model through the chassis data, to ensure the accuracy of the size. Then using CNC machining technology to make a small scale clay model, and then the designer of the milling model for fine processing, from various angles to examine, repeated each line and every a. Finally, after the review, the sludge model is scanned into a point cloud data input computer, and the digital model is rebuilt to form the initial number mode.
 
6. Sludge model
 
Typically, 3-4 small-appearance clay models are produced at a ratio of 1:4, and then a suitable scheme is selected from several modelling schemes to be used as a basis for technical design. Selection seminar mainly discusses the aesthetic issues, but also involves the structure, process and other aspects of the content, it is usually the project leader to convene the stylist, structural designers and responsible for the process, supporting, marketing, sales related links to participate in the meeting.
 
After the first step selection based on the small model, the model of the car must be optimized by the equal proportional models. Until now, the proportional sludge model is still an indispensable link in the process of automobile design and development, because the model of physical and so on is more intuitive and convincing, and the real sense of reducing the scale pattern and full-size drawing is completely different. For example, some rounded corners or curves on a scale model look small and elegant, and a 5 times-fold magnification may seem unwieldy.
 
In the past, traditional methods have been used to manually build 1:1 clay models, and now have the initial number model, can use CNC machining technology, direct milling 1:1 sludge model, for accessories and some sludge more difficult to handle the components (such as bumper, tail, etc.) directly using rapid prototyping technology, installed in the sludge model, which greatly saves time and manpower input. After the review is passed, the solid model is transformed into a point cloud input into the computer through three-dimensional scanning, and the next stage of marching surface smoothing is processed.
 
7. Color design and Parts modelling detail design
 
The appearance of the car is basically 2-3 kinds of color collocation, in which the large area color is the body surface paint painting, the small area black Gray uses in the air inlet grille as well as the color separation design bumper and the protection strip, chooses the chrome-plated bright silver to carry on the local embellishment, like the door handle, the In the automobile interior modelling design in the instrument platform, the middle control desk, the seat, the door interior board, the roof and so on all need to carry on the color and the material design collocation, thus creates the comfortable warm or the movement speed and so on the indoor atmosphere, the automobile color and the material design must match with the automobile overall shape design style, satisfies the consumer individuality, the esthetic appeal and so on
 
8. A-stage surface production
 
The next step is to enter the cloud point data after the sludge model is scanned into the computer, usually by building a-level mathematical surface based on the clay model. Generally, a-level surface must meet the gap between adjacent surfaces at 0. Below 005mm (some even require 0.001mm), the cut rate changes (tangency change) below 0.16 degrees, curvature changes (curvature change) below 0.005 degrees, meet such criteria to ensure the quality of the sheet metal environment reflected.
 
After completing the above 8 steps, the design scheme of a new car enters the final approval link of the enterprise decision-making, which is frozen after the plan is adopted. After the automobile modelling scheme is approved and frozen, the design of automobile structure can be proceeded.
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