Rong Mo

Study on Product Service Oriented Enterprise Servitization Methods

In order to servitize manufacturing enterprises and meet the need of product service system, approaches to servitization are studied. Design for service method, manufacturing for service mode, and product-based service are regarded as key problems and discussed in detail respectively. Concept and evaluation standards of product service relationship are also discussed. And some significant topics for future studies are put forward.

GetCM: A Vision of Cloud Manufacturing

Surviving in an increasing globalization, distribution and flexibility environment, modern manufacturing requires an extremely flexible, self-adaptive foundation capable of dynamic provisioning, coordinating and using infinite manufacturing resources available on demand over large-scale computer networks. In contrast to the conventional networked manufacturing approach, the cloud manufacturing vision (GetCM) introduced in this paper promises elasticity, flexibility and adaptability through the on-demand provisioning of manufacturing resources as a utility by reflecting the basic principles of cloud computing. The discussion is made from technological, functional, economic aspects to provide evidence of the benefits from GetCM in the context of networked manufacturing resource access, provision, sharing and coordination. A primary architecture for GetCM is introduced based on the analysis of key criteria in realizing the vision of a function for cloud manufacturing. Focuses of this paper are placed on the vision and the outline of GetCM architecture.

Design of Product Key Characteristics Management System

The product key characteristics (KCs) which are the small number of key product quality information have a significant impact on customer requirements. Firstly, the definition and classification of KCs was studied. Secondly, KCs evolvement model in the product lifecycle was proposed. The KCs evolvement consists of the KCs breakdown during design and the KCs realization during manufacturing and assembly. Thirdly, according to KCs process analysis, management mechanism of KCs based on workflow technology was presented. The workflow engine drives the KCs process and enables KCs to transfer accurately and quickly. Finally, a model of KCs management system (KCMS) based on web services was proposed.

Imposing Essential Boundary Conditions in Isogeometric Analysis with Nitsche’s Method

Isogeometric Analysis combines the NURBS technology and finite element approaches into a unified framework. Regrettably, the NURBS basis functions don’t interpolate at the control points, which lead to the difficulty for imposing the essential boundary conditions. A new approach inspired by Nitsche’s notion was proposed in order to remedy this issue. The essential boundary constraints are enforced by the consistent penalty terms. It has some notable advantages than the other methods, such as (i) the symmetric and positive definite bilinear formulation when the stiffness matrix is symmetric and the stabilization parameter is large enough; (ii) the well-conditioning coefficient matrix of the linear system. Finally, the numerical experiment was performed to verify the optimal rate of convergence of the present method.

Analysis of Service-Oriented Manufacturing Network Based on Complex Network

Aiming at the description and analysis of service-oriented manufacturing network, the paper gives its definition on the basis of analyzing the relationship between enterprises and service. Besides, it not only defines, calculates and analyzes the statistic characteristics such as node strength and clustering coefficient by the complex weighted theory, but reveals the status of enterprise and correlations in the manufacturing environment of oriented service. This study can not only provide basis for the construction and management of service-oriented manufacturing network, but for search and grouping of collaborative partners.

Study on Key Technologies of Aero-Engine AMRO Support System

In order to solve the digitalized management problem of aero-engine in the whole lifecycle, a framework of aero-engine AMRO supporting system is put forward. Management of assembly, maintenance, repair and overhaul are involved. Modeling and integration of aero-engine status data, assembly process management, on-spot operation guide, online education support, integration and synchronization of data and fault diagnosis support are regarded as key enabling technologies and studied deeply. Correspondent solutions are given respectively. The assembly digitalization sub-system and the IETM sub-system are developed to validate the proposed system. And close-loop controlling of single aero-engine information is achieved, and the study provides technology support for improving level of aero-engine status digitalized management.

Isogeometric Analysis of Heat Transfer in Fluids

This paper is devoted to the numerical simulation of heat transfer in fluids. We develop a numerical formulation based on isogeometric analysis that permits straightforward construction of higher order smooth NURBS approximation. Firstly, we introduce the partial differential equation (PDE) which servers as basis for the whole paper. Then, we introduce Lagrange multiplier method to deal with essentional boundary contions accroding to the nature of NURBS basis function. After getting the Equivalent integral equation, the isogeometric solving format is established based on the idea of isoparametric which is the necessary fundamentals of Isogeometric Analysis. We also discuss the programming algorithm of isogeometric analysis based on Matlab. Finally, a numerical example in two dimensions is presented that illustrate the effectiveness and robustness of our approach.

The Detection of Avalanche Propagation in Engineering Change

In order to avoid avalanche propagation in engineering change that is high-risk and high-cost, two methods for the detection of avalanche propagation were proposed. Firstly, analyzed the reasons for the avalanche propagation and its main features: constraint conflict and/or a great many affected elements. Then, the methods for the detection of those two features based on directed graph and complex networks respectively were proposed. Finally, the experiment of managing a type of transmission was employed to validate our method and it showed the correctness of the proposed method.

An interactive 3D Assembly Process Model

To enable interaction between part models in the 3D assembly process and real manufacturing resources, an extended assembly step model is proposed. Information about manufacturing resources is classified as static information, check item and check result, which endows assembly steps with dynamic interaction ability. The automatic match mechanism between virtual models and real manufacturing resources is put forward to make the interactive assembly step model practical. An implementation framework is also discussed to turn the interactive assembly process into reality.

A Fuzzy Set AHP-Based DFM Tool under Concurrent Engineering Environment

In the light of growing global competition, organizations around the world today are constantly under pressure to produce high-quality products at an economical price. The integration of design and manufacturing activities into one common engineering effort has been recognized as a key strategy for survival and growth. Design for manufacturability (DFM) is an approach to design that fosters the simultaneous involvement of product design and process design. The implementation of the DFM approach requires the collaboration of both the design and manufacturing functions within an organization. At present, For some reasons DFM approach is ineffectively including lack of interdisciplinary expertise of designers; inflexibility in organizational structure, which hinders interaction between design and manufacturing functions. Design for manufacture is the practice of designing products with manufacturing in mind. Early consideration of manufacturing issues can shorten product development cycle time, minimi overall development cost and ensure a smooth transition into production. In this paper, part manufacturability under Concurrent Engineering (CE) environment was analyzed in detail. An evaluation system of DFM was proposed according to CE ideas. A fuzzy set-based manufacturability evaluation algorithm is formulated to generate relative manufacturability indices to provide product designers with a better understanding of the relative ease or difficulty of machining the features in their designs. An analytic hierarchy process (AHP) method is introduced to assign weighting factors to features to reflect their functional importance. Results from the case studies show the method available and practicable.