The hottest wave technology realizes digital camer

2022-08-24
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Wave technology realizes digital camera top

I. top down design and assembly model

product design is a gradual process, which generally goes through three stages: conceptual design, parametric design and detailed design. As shown in Figure 1, this progressive design process is called top-down design

Figure 1 product top down design process

assembly model is the key to realize product top down design. As early as the late 1970s, foreign Lieberman and welsley studied the assembly model of products. Through the unremitting efforts of subsequent generations, the research on assembly models supporting product conceptual design, parametric design and detailed design has been basically completed. The mapping reasoning from product function to structure and the transformation from parametric structure model to detailed assembly model are preliminarily realized

as shown in Figure 2, the hierarchical assembly model is the overall structure of the model object, which is organized and decomposed layer by layer in the way of "coarse to fine, and gradually refined". The relationship between its components is clear at a glance, which conforms to people's natural thinking habits, and can better reflect the design intent and product structure

Figure 2 hierarchical "multi view" organization of assembly model

II. UG wave technology

wave - what if alternative value engineering is a product level parametric system engineering method. Wave is aimed at the first level of product assembly, which is the organic combination of parametric modeling technology and system engineering, and provides the top-down design environment required in the actual engineering product design

wave technology first defines the overall parameters of the product according to its professional knowledge and engineering background; Secondly, define the control structure relationship between the parts of the product (similar to the assembly structure relationship), which makes the rules and standards of product design specific; The third step is to establish the correlation between parts (subsystems, sub parts) in the product, that is, the linkage of geometric shape elements. Thus, a few overall parameters can be used to define, control, evaluate and change products to meet the requirements of rapid market changes. However, using wave technology, when a certain overall parameter is changed, the product will automatically update each component that needs to be changed in the product system according to the originally set control structure, geometric correlation and design criteria, and ensure the design intent and integrity of the product. Wave technology makes the changes of conceptual design and detailed design run through the whole design process of products from beginning to end

III. parametric design of digital camera structure

1 Establish top-down constraints

Figure 3 top-down constraints of digital camera

the structure of digital camera is complex, and the constraint relationship of its related components must be established at the beginning of design. As shown in Figure 3, the overall parameters, peripheral outline dimensions, component positions, etc. can be defined in the upper layer of the assembly structure, and are correspondingly transmitted downward to the component parts of the lower layer of the assembly. The definition data at the top level of the assembly can include datum, sketch, slice for trimming, etc. Lower level components should contain geometric connections to parent geometric objects

2. Establish a hierarchical control model

the control structure is an independent assembly structure, which is used to define and manage the product layout, subsystem design criteria, and the geometric information and parameters required by the layout. The design rules and constraints of products (i.e. total product parameters) are defined at the top level of the control structure to drive the top-down transmission of product design rules and constraints. Below the top level, according to the division of the main subsystems of the design product, the secondary control structure for the subsystems is established in turn to layout and restrict the smaller systems. When all subsystems in the control structure have been divided down into the smallest components, the final stage of the control structure is entered, that is, the establishment of "starting components". The "starting part" is the lowest level of the control structure and the connecting end of the detailed design assembly or conceptual design assembly in the control structure. Establish "connecting parts" by "closing some obsolete equipment starting parts", and "connecting parts" is the first link of product detailed design and assembly. The "connecting part" inherits the relevant geometry and other constraints and restrictions of the "starting part", and any changes in the "starting part" can be transferred to the "connecting part". Figure 4 is a hierarchical control model of digital camera components based on such rules

Figure 4. Hierarchical control model of digital camera components

(1) determination of total product parameters

structural design of digital camera. In addition to these factors, the high and low temperature experimental box is limited by modeling design, selection of outsourced components and development of digital camera circuit. Therefore, the general parameters of the digital camera control structure are established according to the digital camera modeling design, the parameters of purchased parts, circuit design and other uncertain factors, as shown in Figure 5

Figure 5 general parameters of digital camera control structure

(2) divide the main subsystems of digital camera

divide the digital camera into front panel, rear panel, lens assembly, battery box assembly, battery cover CF cover assembly, circuit board assembly, etc. according to the function relationship

(3) establish the assembly drawing of the top-level control structure

Figure 6 is the assembly drawing of the top-level control structure of the digital camera. The top-level control structure must include the overall layout of the digital camera, total parameters and other contents, so that the conceptual design and total parameters can transmit the design rules and constraints of the digital camera from top to bottom through the top-level control structure

Figure 6 assembly diagram of top control structure of digital camera

3 Assembly design

(1) detailed design

take the connecting parts as the starting point, and gradually refine the structure of parts and components according to the functional requirements of parts and components in the camera, so as to promote the detailed design of parts and components; In the design process, the detailed design is carried out while the assembly is carried out. In the assembly structure, the detailed design of parts is further improved through local modeling between parts. Especially for the model features of assembly relationship of parts, it is particularly convenient to apply local modeling between parts

(2) virtual assembly design

Figure 7 is the general assembly drawing of the digital camera. It includes the assembly of front and rear panel components, lens components, circuit board components, battery box components, etc

Figure 7 general assembly drawing of digital camera products

according to the virtual assembly relationship, through motion analysis and interference analysis and inspection, it is helpful to find problems at the beginning of product design, so that the structure of relevant parts can be easily parameterized, which improves the design efficiency of products and saves the design cost of products

IV. parameterized modification of digital camera structure

because the structural design of digital camera is a top-down parameterized design controlled by the digital camera control structure, when the digital camera control structural parameters are modified, they can be automatically transferred to the relevant components of the digital camera assembly, while ensuring that the parts have the correct geometry and position relationship, and maintaining the integrity of the design, And reduce the time and cost of design changes

when the general parameters of the digital camera control structure are modified, the lens, lens support and PCB board will be automatically modified. Figure 8 shows the relative transparency of the structural changes of the lens assembly before and after the modification, that is, the industry of high temperature, high risk and high noise. The structure comparison before and after the modification is made. The dark color is the structure after the modification, and the light color is the structure before the modification

Fig. 8 relative transparency of lens components before and after modification

v. conclusion

UG wave technology is a product level parametric system engineering method, which can well realize the top-down design of the whole product, and can realize the systematic and parametric design of the product according to the series and main parameters of the product. This technology greatly improves the product design efficiency and shortens the product development cycle. (end)

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