Assembly error propagation modeling and coordination error chain construction for aircraft

2019 ◽  
Vol 39 (2) ◽  
pp. 308-322 ◽  
Author(s):  
Feiyan Guo ◽  
Fang Zou ◽  
Jian Hua Liu ◽  
Qingdong Xiao ◽  
Zhongqi Wang
Keyword(s):  
Error Propagation ◽  
Engineering Application ◽  
Leading Edge ◽  
Transformation Process ◽  
Assembly Process ◽  
Content Type ◽  
Influence Matrix ◽  
Complex Products ◽  
Assembly Work ◽  
Assembly Error

Purpose Manufacturing errors, which will propagate along the assembly process, are inevitable and difficult to analyze for complex products, such as aircraft. To realize the goal of precise assembly for an aircraft, with revealing the nonlinear transfer mechanism of assembly error, a set of analytical methods with response to the assembly error propagation process are developed. The purpose of this study is to solve the error problems by modeling and constructing the coordination dimension chain to control the consistency of accumulated assembly errors for different assemblies. Design/methodology/approach First, with the modeling of basic error sources, mutual interaction relationship of matting error and deformation error is analyzed, and influence matrix is formed. Second, by defining coordination datum transformation process, practical establishing error of assembly coordinate system is studied, and the position of assembly features is modified with actual relocation error considering datum changing. Third, considering the progressive assembly process, error propagation for a single assembly station and multi assembly stations is precisely modeled to gain coordination error chain for different assemblies, and the final coordination error is optimized by controlling the direction and value of accumulated error range. Findings Based on the proposed methodology, coordination error chain, which has a direct influence on the property of stealthy and reliability for modern aircrafts, is successfully constructed for the assembly work of the jointing between leading edge flap component and wing component at different assembly stations. Originality/value Precise assembly work at different assembly stations is completed to verify methodology’s feasibility. With analyzing the main comprised error items and some optimized solutions, benefit results for the practical engineering application showing that the maximum value of the practical flush of the profiles between the two components is only 0.681 mm, the minimum value is only 0.021 mm, and the average flush of the entire wing component is 0.358 mm, which are in accordance with theoretical calculation results and can successfully fit the assembly requirement. The potential user can be the engineers for manufacturing the complex products.

Comprehensive identification of aircraft coordination feature based on complete importance modeling and its engineering application

2018 ◽  
Vol 38 (4) ◽  
pp. 398-411 ◽  
Author(s):  
Feiyan Guo ◽  
Fang Zou ◽  
Jian Hua Liu ◽  
Bo Zhao ◽  
Zhongqi Wang
Keyword(s):  
Engineering Application ◽  
Laboratory Method ◽  
Correction Coefficient ◽  
Assembly Process ◽  
Quality Loss ◽  
Content Type ◽  
Aircraft Manufacturing ◽  
Close Relationship ◽  
Geometric Size ◽  
Assembly Precision

Purpose Coordination feature (CF) is the information carrier in dimension and shape transfer process in aircraft manufacturing. The change of its geometric size, shape, position or other attributes would affect the consistency of accumulated errors between two or more assemblies. To identify these “key characteristics” that have a close relationship with the assembly precision, a comprehensive method was developed under digital manufacturing environment, which was based on importance calculation. The multi-hierarchy and multi-station assembly process of aircraft products were also taken into consideration. Design/methodology/approach First, the interaction and evaluation relationship between components at different manufacturing stages was decomposed with a hierarchical net. Second, to meet coordination accuracy requirements, with the integrated application of Taguchi quality loss function, accuracy principal and error correction coefficient H, the quality loss between target features and candidate features at adjacent assembly hierarchies were calculated, which was based on their precision variation. Third, the influence degree and affected degree of the features were calculated with DEMATEL (decision-making trial and evaluation laboratory) method, and the concepts of centrality degree index and cause degree index were proposed for calculating the complete importance degree to eventually identify the CFs. Findings Based on the proposed methodology, CFs, affecting the skin profile and the flush coordination accuracy, were successfully identified at different assembly hierarchies to a certain type of wing flap component. Originality/value Benefit results for the engineering application showed that the deviation of skin profile was more accurate than before, and the tolerance was also closer to the centerline of required assembly precision range. Moreover, the stability in the assembly process was increased by 26.9 per cent, which could bring a higher assembly quality and an enhancement on aircraft’s flight performance.

An on-line compensation method of a metrology-integrated robot system for high-precision assembly

2016 ◽  
Vol 43 (6) ◽  
pp. 647-656 ◽  
Author(s):  
Yifan Jiang ◽  
Xiang Huang ◽  
Shuanggao Li
Keyword(s):  
High Precision ◽  
Degrees Of Freedom ◽  
Compensation Method ◽  
Assembly Process ◽  
Robot System ◽  
Feed Forward ◽  
Content Type ◽  
Assembly Accuracy ◽  
On Line ◽  
Assembly Error

Purpose The purpose of this paper is to propose an on-line iterative compensation method combining with a feed-forward compensation method to enhance the assembly accuracy of a metrology-integrated robot system (MIRS). Design/methodology/approach By the integration of a six degrees of freedom (6DoF) measurement system (T-Mac), the robot’ movement can be tracked with real-time measurement. With the on-line measured data, the proposed iterative compensation for absolute positioning and the feed-forward compensation for relative linear motion are integrated into the assembly process to improve the assembly accuracy. Findings It is found that the MIRS exhibits good performance in both accuracy and efficiency with the application of the proposed compensation method. With the proposed assembly process, a component can be automatically aligned to the target in seconds, and the assembly error can be decreased to 0.021 mm for position and 0.008° for orientation on average. Originality/value This paper presents a 6DoF MIRS for high-precision assembly. Based on the system, a novel on-line compensation method is proposed to enhance the assembly accuracy. In this paper, the assembly accuracy and the corresponding distance parameter are given by a series of experiments as reference for assembly applications.

TOE drivers for cloud transformation: direct or trust-mediated?

2015 ◽  
Vol 27 (2) ◽  
pp. 226-248 ◽  
Author(s):  
Min LI ◽  
Dingtao Zhao ◽  
Yan Yu
Keyword(s):  
Strategic Alliances ◽  
Small And Medium Enterprises ◽  
Leading Edge ◽  
Cloud Service ◽  
Transformation Process ◽  
Market Mechanism ◽  
Environmental Drivers ◽  
Mediating Effects ◽  
Service Market ◽  
Content Type

Purpose – The purpose of this paper is to explain cloud service transformation in small and medium enterprises (SMEs) based on technology-environment-organization paradigm and understand the role of cloud service trust in transformation process. Design/methodology/approach – A survey involving 107 SMEs was conducted to examine the research model and hypotheses. Findings – First, cloud service trust is found to have a significant positive effect on the SMEs’ cloud service transformation intention. The second finding is about significant influences of technological drivers (reliability and information security), environmental drivers (institutional pressure, structure assurance, and vendor scarcity) and entrepreneurship on SMEs’ cloud service trust. Further, the authors found mediating effects of trust on relationships between external drivers and cloud service transformation. Practical implications – For vendors, it suggests building cloud service trust by distinguishing advantages of their cloud service and by establishing strategic alliances with existing users in marketing to attract potential clients. Vendors should target entrepreneurial organizations as initial customers and then expand to other types of organizations. For users, the study implies the need of cultivating entrepreneurship, if they have innovative IT initiatives and need to speed up the IT innovation absorption. Market regulators can provide adequate structural assurances and survival-of-the-fittest market mechanism to stimulate cloud service market. Originality/value – This study is on the leading edge of systematically investigating drivers for SMEs’ cloud service transformation and further reveals a mediating process, in which technological and environmental aspects have primary effects on cloud service trust that sequentially influences cloud service transformation. These mediating effects imply an essential trust building process of cloud service transformation.

Detection and estimation of mental fatigue in manual assembly process of complex products

2018 ◽  
Vol 38 (2) ◽  
pp. 239-247 ◽  
Author(s):  
Hong Xiao ◽  
Yugang Duan ◽  
Zhongbo Zhang ◽  
Ming Li
Keyword(s):  
Dimension Reduction ◽  
Mental State ◽  
Mental Fatigue ◽  
Experimental Result ◽  
Eeg Signal ◽  
Assembly Process ◽  
Manual Assembly ◽  
Content Type ◽  
Complex Products ◽  
Detection And Estimation

Purpose This paper aims to investigate an approach for mental fatigue detection and estimation of assembly operators in the manual assembly process of complex products, with the purpose of founding the basis for adaptive transfer and demonstration of assembly process information (API), and eventually making the manual assembly process smarter and more human-friendly. Design/methodology/approach The proposed approach detects and estimates the mental state of assembly operators by electroencephalography (EEG) signal recording and analysis in an engine assembly experiment. When the subjects perform assembly tasks, their EEG signal is recorded by a portable EEG recording system called Emotiv EPOC+ headset. The feature set of the EEG signal is then extracted by calculating its power spectrum density (PSD), followed by data dimension reduction based on principal component analysis (PCA). The dimension-reduced data are classified by using support vector machines (SVMs), and hence, the mental state of assembly operators can be estimated during the assembly process. Findings The experimental result shows that the proposed approach is able to estimate the mental state of assembly operators within an acceptable accuracy range, and the PCA-based dimension reduction method performs very well by representing the high-dimensional EEG feature set with just a few principal components. Originality/value This paper provides theoretical and experimental basis for the API transfer and demonstration based on human cognition. It provides a new idea to seek balance between the improvement of production efficiency and the sustainable utilization of human resources.

An Assembly Process Model Involved Resource for Complex Products

2012 ◽  
Vol 268-270 ◽  
pp. 845-850
Author(s):  
Gang Sun ◽  
Yuan Li ◽  
Jian Feng Yu ◽  
Jie Zhang ◽  
Liang Dong
Keyword(s):  
Graph Theory ◽  
Process Planning ◽  
Process Model ◽  
Modeling Method ◽  
Assembly Process ◽  
Product Model ◽  
Typical Structure ◽  
Complex Products ◽  
3D Environment ◽  
Interactive Relationship

Fixtures, tools, and other assembly resources have an important role in the assembly of complex products, so it is very necessary to consider the interactive relationship between the resources model and the product model for assembly order planning in 3D environment. Firstly, the features of assembly process planning involved resources are analyzed. Secondly, the concept of the assembly process intention（AsmPI） is introduced，and an assembly process can be divided into an AsmPI sequence. Thirdly, based on the graph theory, a resource-involved assembly process model is built up. At last, setting a typical structure as an example, the validity of this modeling method is verified.

Innovation-orientation, dynamic capabilities and evolution of the informal Shanzhai firms in China

2016 ◽  
Vol 8 (1) ◽  
pp. 45-59 ◽  
Author(s):  
Rongwei Ren ◽  
Lei Yu ◽  
Yunxia Zhu
Keyword(s):  
Emerging Economies ◽  
Dynamic Capabilities ◽  
Theoretical Perspective ◽  
Leading Edge ◽  
Industrial Cluster ◽  
Innovation Development ◽  
Content Type ◽  
Damage Degree ◽  
Enhance Property ◽  
Communication Equipment

Purpose – This paper aims to study the evolution of innovation-based dynamic capabilities in informal copycat-style firms. As a kind of informal economical organizations, copycat-style firms in many emerging economies play an important role in their development of the economics. The development of Shanzhai firms, Chinese-style copycat firms, from imitation to innovation has become an important micro-foundation of China’s economic growth and the manufacturing development. With the cluster development of the Chinese mobile phone industry as the macro and industrial environment background, this paper chose Beijing Tianyu Communication Equipment Co. Ltd as the typical example of innovation in Shanzhai firms and studied the evolution of innovation-based dynamic capabilities in this company. Design/methodology/approach – This paper chose Beijing Tianyu Communication Equipment Co. Ltd as the typical example of innovation in Shanzhai firms and studied the evolution of innovation-based dynamic capabilities in this company by adopting the leading-edge dynamic capability theory, innovation theory and industrial cluster theory. The authors further discussed how to improve the dynamic capabilities in Shanzhai firms in China. Findings – It is finally suggested that Shanzhai firms should reduce innovation failures and lower damage degree of dynamic capabilities through consistent innovation and paying attention to their innovation improvement. Originality/value – It will be very significant to research the survival or diminishing of Shanzhai firms from a theoretical perspective, which will eventually enhance property right protection and innovation development in China.

The new retail model: global reach demands omni-channels

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Guillaume Do Vale ◽  
Isabelle Collin-Lachaud ◽  
Xavier Lecocq
Keyword(s):  
Business Model ◽  
Business Strategy ◽  
Academic Research ◽  
Transformation Process ◽  
Content Type ◽  
New Business ◽  
Business Cases ◽  
Established Firms ◽  
New Consumer ◽  
Global Reach

Purpose To cope with online competitors and new consumer behaviors, retailers need to hybrid digital and physical offerings to implement an omni-channel business model. This constitutes a digital transformation of the traditional business model. However, business cases on how traditional retailers are shifting from multi-channel to omni-channel retailing are lacking. This paper aims to explore the different issues and organizational paths during the transformation of a business model. Design/methodology/approach This study is based on a qualitative multiple case study of five retailers with a global reach currently implementing an omni-channel business model. Findings This research sheds light on three main issues encountered by retailers and the different underlying decisions when moving toward an omni-channel business model. The first relates to revenue attribution across channels, which involves rethinking traditional key performance indicators to give incentives to stores when promoting digital offers. The second issue concerns the supply chain decisions associated with cross-channel operations. The third issue relates to the delicate balance between global reach (digital channel) and local reach (specific store) for communication on social media and marketing decisions on pricing. This study provides empirical evidence about the variety of choices that retailers make to cope with the issues during the implementation of an omni-channel business model. Originality/value This work explores the issues faced by established firms when moving toward a new business model that is the hybridization of two existing business model managed separately. It provides comprehensive and clear illustration of how to manage such a business model transformation process that can be used by both business strategy practice and academic research.

Numerical investigation of an anti-icing method on airfoil based on the NSDBD plasma actuator

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Junjie Niu ◽  
Weimin Sang ◽  
Feng Zhou ◽  
Dong Li
Keyword(s):  
Phenomenological Model ◽  
Stokes Equations ◽  
Pulse Repetition Frequency ◽  
Leading Edge ◽  
Pulse Frequency ◽  
Plasma Actuator ◽  
Navier Stokes ◽  
Peak Voltage ◽  
Content Type ◽  
Naca0012 Airfoil

Purpose This paper aims to investigate the anti-icing performance of the nanosecond dielectric barrier discharge (NSDBD) plasma actuator. Design/methodology/approach With the Lagrangian approach and the Messinger model, two different ice shapes known as rime and glaze icing are predicted. The air heating in the boundary layer over a flat plate has been simulated using a phenomenological model of the NSDBD plasma. The NSDBD plasma actuators are planted in the leading edge anti-icing area of NACA0012 airfoil. Combining the unsteady Reynolds-averaged Navier–Stokes equations and the phenomenological model, the flow field around the airfoil is simulated and the effects of the peak voltage, the pulse repetition frequency and the direction arrangement of the NSDBD on anti-icing performance are numerically investigated, respectively. Findings The agreement between the numerical results and the experimental data indicates that the present method is accurate. The results show that there is hot air covering the anti-icing area. The increase of the peak voltage and pulse frequency improves the anti-icing performance, and the direction arrangement of NSDBD also influences the anti-icing performance. Originality/value A numerical strategy is developed combining the icing algorithm with the phenomenological model. The effects of three parameters of NSDBD on anti-icing performance are discussed. The predicted results show that the anti-icing method is effective and may be helpful for the design of the anti-icing system of the unmanned aerial vehicle.

A grey STA-GERT quality evaluation model for complex products based on manufacture-service dual-network

2014 ◽  
Vol 4 (2) ◽  
pp. 195-206 ◽  
Author(s):  
Ruiting Xu ◽  
Zhigeng Fang ◽  
Jinyu Sun
Keyword(s):  
Evaluation Model ◽  
Estimation Method ◽  
Analytic Hierarchy ◽  
Content Type ◽  
Complex Products ◽  
Reasonable Approach ◽  
Estimate Quality ◽  
Grey Number ◽  
Hierarchy Process

Purpose – The purpose of this paper is to find out a scientific method to evaluate quality of complex products, whose quality is different from general products. Design/methodology/approach – Based on interval grey number theory, reliability analysis method and stochastic network theory, authors have established grey success tree analysis-graph evaluation and review technique (GSTA-GERT) model in this paper. Findings – Comparing complex products and general products, authors have found that complex products have two characters, i.e. quality of manufacture and quality of service. Furthermore, this paper has proved the GSTA-GERT model is a scientific and reasonable approach to estimate quality of complex products from the sight of manufacture-service network. Originality/value – This paper has established GSTA-GERT model, which surmounts the defect of traditional estimation method, such as lacking logic analysis in the method of analytic hierarchy process.

Recent advances in reliability analysis of aeroengine rotor system: a review

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Xue-Qin Li ◽  
Lu-Kai Song ◽  
Guang-Chen Bai
Keyword(s):  
Reliability Analysis ◽  
Surrogate Model ◽  
Engineering Application ◽  
Rotor System ◽  
Engineering Structures ◽  
Content Type ◽  
Reliability Design ◽  
Rotor Systems ◽  
Practical Engineering ◽  
Complex Engineering

PurposeTo provide valuable information for scholars to grasp the current situations, hotspots and future development trends of reliability analysis area.Design/methodology/approachIn this paper, recent researches on efficient reliability analysis and applications in complex engineering structures like aeroengine rotor systems are reviewd.FindingsThe recent reliability analysis advances of engineering application in aeroengine rotor system are highlighted, it is worth pointing out that the surrogate model methods hold great efficiency and accuracy advantages in the complex reliability analysis of aeroengine rotor system, since its strong computing power can effectively reduce the analysis time consumption and accelerate the development procedures of aeroengine. Moreover, considering the multi-objective, multi-disciplinary, high-dimensionality and time-varying problems are the common problems in various complex engineering fields, the surrogate model methods and its developed methods also have broad application prospects in the future.Originality/valueFor the strong demand for efficient reliability design technique, this review paper may help to highlights the benefits of reliability analysis methods not only in academia but also in practical engineering application like aeroengine rotor system.

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