Assembly research of aero-engine casing involving bolted connection based on rigid-compliant coupling assembly deviation modeling

2020 ◽  
Vol 234 (14) ◽  
pp. 2803-2820
Author(s):  
Hehe Kang ◽  
Zhi-Min Li
Keyword(s):  
Effective Means ◽  
Design Stage ◽  
Assembly Quality ◽  
Bolted Connection ◽  
Manufacturing Tolerance ◽  
Compliant Assembly ◽  
Aero Engine ◽  
Key Factor ◽  
Geometric Deviation ◽  
Assembly Deviation

Assembly analysis is necessary for mechanical product to optimize design and improve the product quality since assembly deviation is the key factor affecting the assembly quality. In this paper, the rigid-compliant assembly of thin-walled aero-engine casing is studied to evaluate the assembly quality at the design stage. First, the Jacobian–Torsor model is proposed to construct multistage casing assembly owing to its effectiveness to express assembly deviation. The torsor expression is modified and expanded to present the rigid-compliant coupling tolerance. Then, the partial parallel chain is addressed via combination operation. By using extremum and statistical method, the tolerance zone and the distribution of the objective deviation are obtained. Furthermore, to study the effect of specified compliant deviation on statistical distribution, the bolt looseness and positional deformation are investigated to provide an effective means for geometric deviation and connecting joints of aero-engine casing components of precision assembly. The presented method can address compliant deformation tolerance and geometrical manufacturing tolerance together, and is reliable for casing assembly to predict assembly quality at the design stage. In addition, it also has a great significance to guide tolerance design and product optimization.

Improvement of Variation Propagation Control in Mechanical Assembly Using Adjustment Assembly Technique

2017 ◽  
Vol 870 ◽  
pp. 459-464 ◽  
Author(s):  
Chuan Zhi Sun ◽  
Lei Wang ◽  
Jiu Bin Tan ◽  
Bo Zhao ◽  
Guo Liang Jin ◽  
...  
Keyword(s):  
Assembly Model ◽  
Mechanical Assembly ◽  
Assembly Quality ◽  
Cumulative Error ◽  
Assembly Method ◽  
Variation Propagation ◽  
Rotationally Symmetric ◽  
Aero Engine ◽  
Assembly Technique ◽  
Engine Components

This paper aims to provide an assembly method to improve mechanical assembly quality. In order to improve the variation propagation control in rotationally symmetric cylindrical components assembly, the eccentric and tilt errors of a single rotor stage were taken into account using a connective assembly model and the eccentric deviation in a mechanical assembly was minimized by properly selecting component orientations. Compared to the minimum cumulative error, the maximum cumulative error was reduced by 71 percent, and the average cumulative error was reduced by 57 percent in the assembly of three components. This article provides an assembly method through variation propagation control in rotationally symmetric cylindrical components assembly. The method could be extended to rotationally symmetric cylindrical components assembly, for example in the assembly of aero-engine components.

Deformation Analysis for Welding Assembly Processes of Automobile Panels

2010 ◽  
Vol 118-120 ◽  
pp. 70-74
Author(s):  
Yu Liu ◽  
Jian Xin Liu ◽  
Shu Yi Yan ◽  
Zhi Min Wang ◽  
Bing Zhang
Keyword(s):  
Numerical Simulation ◽  
Welding Process ◽  
Coupling Method ◽  
Welding Distortion ◽  
Deformation Analysis ◽  
Assembly Quality ◽  
Automobile Body ◽  
Dimensional Deviation ◽  
Assembly Deviation

Welding process of automobile panels is a key process in the manufacturing of automobile body and its quality directly impact on the appearance and quality of automobile. The causes of dimensional deviation of welded assembly could be workpieces variation, assembly tooling variation, and welding distortion. As a major source of assembly deviation, dimensional variations of workpieces have important effects on the assembly quality of automobile body. In this paper, pre-stressing was used to reflect the workpieces’ variation and the node coupling method was used in the numerical simulation to predict the deformation of assembly caused by the welding process of automobile panels. And further the computation results were listed and compared with the measured ones.

Anti-Interference Optimal Design of Grain Combine Harvester Multiple Target Working Speed Control Model

2013 ◽  
Vol 753-755 ◽  
pp. 1382-1385
Author(s):  
Xin Wang ◽  
Han Fu ◽  
Du Chen ◽  
Shu Mao Wang
Keyword(s):  
Effective Means ◽  
Optimization Theory ◽  
Multiple Control ◽  
Power Cost ◽  
High Productivity ◽  
Key Factor ◽  
Objective Control ◽  
Combine Harvester ◽  
And Control ◽  
Measurement And Control

Harvesting speed is a key factor that influences working quality, utilization and harvest efficiency of the working process of grain combine harvester. In order to solve multi-objective control and poor anti-interference ability of measurement system in combine harvester, this paper uses optimization theory and error analysis theory to integrate analyze multi-source disturbance of data which is acquired in measurement and control system. The optimum working state control algorithm which proposes by this paper has better robust and anti-interference features, and what is more, it can be targeted by low yield loss, high productivity and low power cost. It provides theoretical basis and data support for the domestic agricultural harvesting machine, which also is an effective means to heighten the automatic level of the agricultural information technology. Keywords: Grain Combine harvester; Multiple control strategy; Anti-interference ability

An Integrative Methodology for Product and Supply Chain Design Decisions at the Product Design Stage

2011 ◽  
Vol 133 (2) ◽  
Author(s):  
Ming-Chuan Chiu ◽  
Gül Okudan
Keyword(s):  
Supply Chain ◽  
Product Design ◽  
Supplier Selection ◽  
Supply Chain Design ◽  
Simultaneous Optimization ◽  
Design Stage ◽  
Supply Chain Performance ◽  
Bicycle Industry ◽  
Key Factor ◽  
Optimization Methodology

Supplier selection is one of the key decisions in supply chain management. Companies need not only to make the “make” or “buy” decisions but also differentiate across potential suppliers in order to improve operational performance. Product design is an engineering based activity that realizes the customer requirements into functions of a new product. Many studies have pointed out that the integration of product and supply chain is a key factor for profitability and efficiency. However, most studies address supply chain performance after freezing the design of the product; only a few studies discuss when and how to incorporate supply chain decisions during product design. This paper presents a graph theory based optimization methodology to tackle this problem. The supplier selection issue is considered by evaluating its impact on both internal (e.g., ease of assembly) and external (e.g., transportation time) enterprise performances, which are aggregated as supply chain performance at the conceptual design stage. A case study in the bicycle industry demonstrates the advantages of this methodology. The presented mathematical programming formulation enables simultaneous optimization of both product design and supply chain design during the early design stages.

Simplified Model for the Weight Estimation of Floating Offshore Plant Using the Statistical Method

2014 ◽  
Author(s):  
Myung-Il Roh ◽  
Seong-Ho Seo ◽  
Hyun-Kyoung Shin ◽  
Nam-Kug Ku ◽  
Sol Ha ◽  
...  
Keyword(s):  
Statistical Method ◽  
Production Method ◽  
Simplified Model ◽  
Design Stage ◽  
Production Data ◽  
Weight Estimation ◽  
Important Data ◽  
Early Design Stage ◽  
Key Factor ◽  
Production Period

The weight information of a floating offshore plant, such as an FPSO, is one of the important data to estimate the amount of production material and to determine the production method for its construction. In addition, the weight information is a key factor which affects in the building cost and production period of the offshore plant. Although the importance of the weight has long been recognized, the weight has been roughly estimated by using the existing design and production data, and designer’s experience. To improve this task, a simplified model for the weight estimation of the offshore plant using the statistical method was developed in this study. To do this, various past records to estimate the weight of the offshore plant were collected through the literature survey, and then the correlation analysis and the multiple regression analysis were performed to develop the simplified model for the weight estimation. Finally, to evaluate the applicability of the developed model, it was applied to some examples of the weight estimation of topsides of the offshore plant. The results showed that the developed model can be applied the weight estimation process of the offshore plant at the early design stage.

VARIOUS ASPECTS OF INTELLIGENT COLLABORATIVE EDUCATIONAL SYSTEMS

2017 ◽  
Vol 2 ◽  
pp. 67
Author(s):  
Sabina Katalnikova ◽  
Leonids Novickis
Keyword(s):  
Intelligent Systems ◽  
Intelligent System ◽  
System Development ◽  
Effective Means ◽  
Educational Systems ◽  
Knowledge Based ◽  
Knowledge Based Economy ◽  
Wide Range ◽  
Key Factor ◽  
System Knowledge

In connection with the transition to a knowledge-based economy, at a time when a key factor in the development of society is the accumulated human knowledge and skills, as well as the availability of a wide range of users, intelligent systems are becoming very popular. Accordingly, the demand of the ergonomic and effective means of designing this class system is growing as well. The most time-consuming and most important stage of intelligent system development is the formation of the system knowledge base which ultimately determines the efficiency and quality of the entire intelligent system. Knowledge representation and processing models and methods as well as the intelligent system development techniques operating on the basis of these methods and models have a crucial role in relation to this. The article explores the different aspects of intelligent collaborative educational systems, describes the overall structure of an intelligent collaborative educational system and reflects the different steps of development the system.

Multidisciplinary Design Optimization on Conceptual Design of Aero-engine

2016 ◽  
Vol 33 (2) ◽  
Author(s):  
Xiao-bo Zhang ◽  
Zhan-xue Wang ◽  
Li Zhou ◽  
Zeng-wen Liu
Keyword(s):  
Design Optimization ◽  
Conceptual Design ◽  
Multidisciplinary Design Optimization ◽  
System Level ◽  
Multidisciplinary Design ◽  
Design Stage ◽  
Surface Model ◽  
Coupled Problem ◽  
Aero Engine ◽  
Integrated Performance

AbstractIn order to obtain better integrated performance of aero-engine during the conceptual design stage, multiple disciplines such as aerodynamics, structure, weight, and aircraft mission are required. Unfortunately, the couplings between these disciplines make it difficult to model or solve by conventional method. MDO (Multidisciplinary Design Optimization) methodology which can well deal with couplings of disciplines is considered to solve this coupled problem. Approximation method, optimization method, coordination method, and modeling method for MDO framework are deeply analyzed. For obtaining the more efficient MDO framework, an improved CSSO (Concurrent Subspace Optimization) strategy which is based on DOE (Design Of Experiment) and RSM (Response Surface Model) methods is proposed in this paper; and an improved DE (Differential Evolution) algorithm is recommended to solve the system-level and discipline-level optimization problems in MDO framework. The improved CSSO strategy and DE algorithm are evaluated by utilizing the numerical test problem. The result shows that the efficiency of improved methods proposed by this paper is significantly increased. The coupled problem of VCE (Variable Cycle Engine) conceptual design is solved by utilizing improved CSSO strategy, and the design parameter given by improved CSSO strategy is better than the original one. The integrated performance of VCE is significantly improved.

scholarly journals Using InSAR settlement data in a levee strengthening project for building settlement risk assessment

2020 ◽  
Vol 382 ◽  
pp. 697-702
Author(s):  
Rob R. van Buuren ◽  
Jacco K. Haasnoot ◽  
Michel de Koning ◽  
Marco Weijland ◽  
Hans J. W. van Zanten
Keyword(s):  
Risk Assessment ◽  
Design Stage ◽  
Data Set ◽  
Data Density ◽  
Key Factor ◽  
Consistent Assessment ◽  
Foundation Type ◽  
The City

Abstract. For the levee strengthening project Krachtige IJsseldijken Krimpenerwaard (KIJK) a study has been done to examine all buildings along 10 km of levee. These buildings are an important factor in the design stage, because of its sensitivity to deformations due to the natural compaction of the soft deposits (creep) and the potential effects of the levee strengthening. This paper covers the quantification of building settlement due to natural subsidence using InSAR. Research is performed in the city archives to establish the characteristics of the buildings, such as the foundation type. Although the city archive is well organised, it is not complete. The building data density is substantially improved using InSAR information. This enhanced data set is a key factor in establishing an consistent assessment of the risk of damage for the different levee strengthening alternatives.

scholarly journals LEGISLATIVE GUARANTEES FOR CORRUPTION WHISTLEBLOWER`S PROTECTION

2020 ◽  
Vol 2020 (1) ◽  
pp. 83-93
Author(s):  
Samofalov О. L. ◽  
◽  
Rusevich K. О. ◽  
Keyword(s):  
Information Disclosure ◽  
Effective Means ◽  
Criminal Code ◽  
International Standards ◽  
Public Interests ◽  
The Public ◽  
State Apparatus ◽  
Effective System ◽  
Key Factor ◽  
Corruption Prevention

The article is devoted to the coverage of legislative guarantees for the whistleblowers`s protection in order to improve and develop national legislation regarding corruption prevention. Combatting corruption is an urgent issue for Ukraine today, as one of the reasons for the ineffective work of the state apparatus is corruption, the essence of which is that civil servants performancing their duties are endowed with public authority, which in combination with the unscrupulous performance of their official duties, leads to the fact that they have personal interests, which differ in content and direction from the primary tasks of the civil service as a whole. Corruption whistleblowers are a key factor in detecting corruption, and therefore they must be protected by guarantees at the legislative level. A legislative guarantees research of the whistleblowers` protection proves that such real protection can only be guaranteed by a separate special law that will create an effective mechanism for disseminating socially necessary information and will clearly prescribe legislative guarantees. The information disclosure of harm or threat to public interests is one of the most effective means of detecting and combating corruption and also serious economic offenses. In order to make the most of the benefits of disclosing information to the harm or threat to the public interest, there must be laws in the country that will provide whistleblowers with legislative guarantees not only for themselves, but also for their relatives. The main way to improve the legislative guarantees for the whistleblowers` protection is a promising draft act “On the protection of whistleblowers”. The adoption of the Law “On the protection of whistleblowers” will ensure the creation of a new effective system for preventing corruption on the basis of international standards, which will help in reducing the corruption level in the country, and thus – economic development and welfare. At the same time, it is promising to expand and clarify the regulations of the Criminal Code of Ukraine, which guarantee the protection of whistleblowers. Key words: corruption, anti-corruption, evidence, corruption whistleblowers, protection of whistleblowers.

scholarly journals Conceptualisation as Key Factor in Seizing Design Project in Studio Learning Environment

2018 ◽  
Vol 3 (12) ◽  
pp. 43
Author(s):  
Fatimah Mohamad Adi ◽  
Khairul Anwar Mohamed Khaidzir ◽  
Ismail Said
Keyword(s):  
Learning Environment ◽  
Conceptual Design ◽  
Publishing House ◽  
Design Stage ◽  
Physical Form ◽  
Key Factor ◽  
Final Design ◽  
International Publishing ◽  
Open Access Article

This study provides insight into the role of experience in facilitating conceptualisation process to enable students to harness relevant problems-solving skills. One of the key strategies of the current study is to analyse how students transform their ideas from abstract to physical form through the conceptualisation process within the studio learning environment. Two aspects were considered (1) the factors that influence the student's actions in designing, and (2) the role of critique in stimulating the student's conceptual design towards final design stage. Evidences were gathered from students' dynamic cognitive interactions with knowledge and experience as transpired through the studio environment.Keywords: Conceptualisation, conceptual design process, reflective knowledgeeISSN 2398-4295 © 2018. The Authors. Published for AMER ABRA cE-Bs by e-International Publishing House, Ltd., UK. This is an open-access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer–review under responsibility of AMER (Association of Malaysian Environment-Behaviour Researchers), ABRA (Association of Behavioural Researchers on Asians) and cE-Bs (Centre for Environment-Behaviour Studies), Faculty of Architecture, Planning & Surveying, Universiti Teknologi MARA, Malaysia.

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