Simplified representation method for aircraft fasteners

Abstract

The invention discloses a simplified representation method for aircraft fasteners, and relates to the field of digital design and data management for aircraft fasteners. Traditional fasteners are expressed by a three-dimensional entity module in an aircraft digital prototype, and are represented by points in two-dimensional engineering drawings. From the three-dimensional module to a two-dimensional drawing, information of the fasteners is incomplete and disconnected during transmission; it is difficult to account the data and easy to make mistakes; the fasteners are large in number; the data is redundant; and it is time-consuming to call the data repeatedly and difficult to manage the data. According to the method, the fasteners are represented by geometrical elements of line segments, circles and the like in a CATIA three-dimensional model; the line segments represent the installation directions and lengths of the fasteners; the circles represent the diameters of the fasteners; non-geometrical information, such as trademark specifications, names, weights, gravity centers, standards and the like, of the fasteners are represented in a structured format in a manner of combining a geometric figure set and parameters under a structure tree. The simplified representation method is mainly applied to digital representation and data management of the fasteners in the design process of the full-three-dimensional digital prototype of the aircraft.

Description

technical field [0001] The invention patent relates to the fields of digital design and data management of aircraft products. Background technique [0002] In the traditional aircraft body assembly design process, a large number of fasteners need to be defined and used. The 3D solid model of the fastener is drawn using the 3D CAD software CATIA. The 3D model contains the geometric information and non-geometric information of the fastener. Through parametric modeling, a 3D solid model is generated from the fastener geometry data. The entity model is called in the 3D assembly model. In the 2D engineering drawing, the fasteners are usually represented by simplified "points". The arrangement is mainly defined in the 2D plan view, and the grade and quantity of the fasteners are marked. The method is simple, easy to implement, and easy to understand. The number of large aircraft fasteners accounts for 70-80% of the number of aircraft parts, which can reach more than 1 million pi...

AI Technical Summary

Problems solved by technology

The number of large aircraft fasteners accounts for 70-80% of the number of aircraft parts, which can reach more than 1 million pieces. The three-dimensional digital model of fasteners has a huge amount of data in the PDM system, and the design changes frequently, and the number of parts reaches hundreds of thousands. Sometimes, the operation of the data management platform may be unstable and prone to immeasurable risks

The layout definition and quantity statistics of nearly one million fasteners in two-dimensional drawings rely on manual definition and calculation by designers, which involves a huge amount of repetitive labor, redundant data, time-consuming calculation and statistics, error-prone, difficult to control changes, and data Unable to carry out digital transmission, the information transmission is disconnected, which is not conducive to the digital management of data

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