Digital twin modeling method based on biomimicry for machining aerospace components

High-performance aerospace component manufacturing requires stringent in-process geometrical and performance-based quality control. Real-time observation, understanding and control of machining processes are integral to optimizing the machining strategies of aerospace component manufacturing. Digital Twin can be used to model, monitor and control the machining process by fusing multi-dimensional in-context machining process data, such as changes in geometry, material properties and machining parameters. However, there is a lack of systematic and efficient Digital Twin modeling method that can adaptively develop high-fidelity multi-scale and multi-dimensional Digital Twins of machining processes. Aiming at addressing this challenge, we proposed a Digital Twin modeling method based on biomimicry principles that can adaptively construct a multi-physics digital twin of the machining process. With this approach, we developed multiple Digital Twin sub-models, e.g., geometry model, behavior model and process model. These Digital Twin sub-models can interact with each other and compose an integrated true representation of the physical machining process. To demonstrate the effectiveness of the proposed biomimicry-based Digital Twin modeling method, we tested the method in monitoring and controlling the machining process of an air rudder.     

基于MBD模型的航空发动机零件检测技术

针对当前复杂零件中异型特征位置度无法测量的问题,提出了一种基于MBD模型数字化测量技术.该方法以复杂零件的MBD模型为测量依据,通过模型理论元素与实测元素拟合计算异型特征位置度偏差,并以此为基础进行测量工艺规划、测量程序编制、测量仿真等.可大大减少在机等待时间,避免测量过程中的碰撞与测针干涉问题,解决了不规则特征位置度测量问题,实现了全程的自动测量,提高了检测效率.     

Re-engineering the Engineering Change Management process for a drawing-less environment

Currently, 3D models and 2D drawings are the main basic elements that together form and carry the product definition throughout the product lifecycle. With the advent of the Digital Product Definition trend, industries have been interested in adopting a Model-based Definition (MBD) approach that enables the integration of drawing annotations directly onto a 3D model, thereby minimizing the need to generate engineering drawings. This drawing-less environment requires a way to adequately carry the product definition throughout a product's lifecycle while supporting all of the downstream users’ specific needs. The objective of this article is to present a solution to carry the Engineering Change Management (ECM) process in a drawing-less environment. Therefore, based on ECM process requirements from two Canadian aerospace companies, we propose an MBD dataset which consists of an MBD model and a distribution file. The proposed MBD dataset is evaluated and the MBD-driven ECM process is outlined.     

An Efficient Multibody Dynamics Model for Internal Combustion Engine Systems

The equations of motion for the major components in an internalcombustion engine are developed herein using a recursive formulation.These components include the (rigid) engine block, pistons, connectingrods, (flexible) crankshaft, balance shafts, main bearings, and enginemounts. Relative coordinates are employed that automatically satisfy allconstraints and therefore lead to the minimum set of ordinarydifferential equations of motion. The derivation of the equations ofmotion is automated through the use of computer algebra as the precursorto automatically generating the computational (C or Fortran) subroutinesfor numerical integration. The entire automated procedure forms thebasis for an engine modeling template that may be used to supportthe up-front design of engines for noise and vibration targets.This procedure is demonstrated on an example engine under free(idealized) and firing conditions and the predicted engine responses arecompared with results from an ADAMS model. Results obtained by usingdifferent bearing models, including linear, nonlinear, and hydrodynamicbearing models, are discussed in detail.     

面向三维工序数模构建的特征标注方法研究

针对以三维工序数模开展工艺设计时尺寸标注工作量非常大的问题,提出了基于制造特征完成工序模型的自动标注的方法。首先,对零件MBD模型进行预处理,并对其尺寸标注信息进行提取;其次,基于零件MBD模型上特征的定位尺寸和工艺基准构建特征尺寸链,通过特征尺寸链换算求解工序尺寸,解决工艺设计中工艺基准与设计基准不重合的问题;然后,对其尺寸标注进行显示;最后,在UG平台下通过实例测试,验证了该方法的可行性和有效性。     

基于Pro/E的三维机加工工艺设计方法研究

基于三维模型机加工工艺设计是当前制造领域研究的热点。针对此问题,在分析三维机加工工艺设计特点的基础上,提出了三维机加工工艺设计方法及实施技术途径,并基于Pro/E平台分析了某零件三维机加工工艺设计过程,验证了方法的可行性和有效性。     

复合材料构件MBD模型规范化检查系统研究及应用

随着MBD技术在航空复合材料构件设计当中的应用,三维模型成为产品几何与非几何信息的唯一载体,是生产制造过程中的主要依据。由于复合材料构件结构多样性以及设计表达的复杂性,仅靠设计人员经验不能保证三维模型的质量,需要建立全面的建模规范以及面向设计/制造的检查系统来实时指导和规范复合材料构件全三维建模。为了实现对复合材料构件MBD模型的质量控制,研究了基于检查模板的构件模型规范性检查技术,对复合材料构件建模过程进行了规范性分析,并设计了构件MBD模型规范化检查系统,保障了三维模型定义的规范性、完整性和工艺性。基于B/S和C/S混合模式进行了系统开发,将其应用到某航空制造企业复合材料构件建模过程,并以某复合材料构件三维模型的检查为例验证了系统的可行性。     

军用电子产品数字化协同设计平台研究与应用

针对复杂军事电子产品研制过程中存在的物料清单（Bill of Material, BOM）准确率低、多专业协同难度大、技术状态变更频繁等问题,采用基于模型定义（Model Based Definition, MBD）技术建立全三维、一体化协同研制环境,围绕多专业在线协同设计、一体化BOM管理、三维工艺可视化、企业级基础资源库等关键技术开展研究,配合MBD标准规范、业务流程优化等保障措施,有力支撑新研型号产品全三维一体化研制模式落地,为企业研制模式数字化转型提供有益参考。     

基于三维模型的雷达结构件数字化检测技术应用

雷达产品三维设计技术的不断完善与应用,对产品制造检验提出了更高要求,传统的检验方法和手段难以满足数字化研制环境下的质量保证要求。文中概述了基于三维模型的检测技术的发展,通过具体实例说明了三维数字化检测的流程与应用方法。以数字化技术手段代替传统的手工测量,解决了数字化环境下基于三维模型的检测难题,可在保证雷达产品数字化生产质量方面起到一定的作用。     

基于UG二次开发的PMI信息快速标注研究

随着技术的快速发展,MBD(Model Based Definition)技术逐渐应用到汽车航天等制造领域。MBD技术的核心思想是用一个集成的CAD三维模型来完整的表达产品定义信息,将三维模型作为信息传递的唯一载体。而三维标注技术就是将产品信息和三维模型关联起来的关键环节。针对目前三维标注存在的问题及缺陷,本文提出一种全新的PMI信息快速标注路线。在MBD技术的基础上,制定模型要素的PMI信息明细表,并对CAD模型中的要素进行定义;以UG11.0为开发平台、利用C/C++编程语言实现了CAD三维模型PMI信息的快速标注。