Methods for the Control of Uncertainty in Multilevel Process Chains Using the Example of Drilling/Reaming

2011 ◽  
Vol 104 ◽  
pp. 103-113 ◽  
Author(s):  
Michael Haydn ◽  
Thomas Hauer ◽  
Eberhard Abele
Keyword(s):  
Systematic Approach ◽  
Simulation Models ◽  
Production Costs ◽  
Material Strength ◽  
Process Chain ◽  
Production Processes ◽  
Process Chains ◽  
Key Aspects ◽  
And Control ◽  
Previous Step

Uncertainty during production processes has an important influence on the product quality as well as production costs. For multilevel process chains with serially connected processes, additional uncertainty can be caused by the previous step. The manufacturing of precision holes by drilling and reaming is an important multilevel process chain. The interactions between machine, tool and pre-drilled hole cause process errors during the quality determinant final reaming process. In this paper, a systematic approach for the identification and control of uncertainty during the reaming process is presented. Thus, the influence of key aspects like skewness of pre-drilled hole or the influences of material strength gradients are analyzed. Further, simulation models for the consideration of these uncertainties are presented.

Systematic Process Chain Creation for CFRP Structures in Early Product Development Stages

2016 ◽  
Vol 1140 ◽  
pp. 328-334
Author(s):  
Matthias Behr ◽  
Carsten Schmidt
Keyword(s):  
Composite Structures ◽  
Production Costs ◽  
Preliminary Design ◽  
Process Chain ◽  
Whole Process ◽  
Reinforced Plastic ◽  
Building Process ◽  
Process Chains ◽  
Carbon Fibre Reinforced Plastic ◽  
Specific Sequences

A planning method is presented which allows to systematically building process chains based on a preliminary design of composite structures. The method utilises the specific sequences of procedural steps that occur in the production of carbon fibre reinforced plastic (CFRP) structures, to build sub process chains for each component of the structure. Process restrictions are considered to evaluate the suitability of different production processes. To obtain the whole process chain of the structure, different joining methods are applied in addition to combine the components and its sub process chains. The results of the presented method are used in an overarching development procedure to investigate resulting impacts on the solution. Possible impacts could be the production costs or the material characteristics.

scholarly journals ACCOUNTING AND CONTROL WITHIN THE FRAMEWORK OF AGILE METHODOLOGY

2020 ◽  
pp. 173-181
Author(s):  
Оksana Balaziuk ◽  
Inna Sysoieva
Keyword(s):  
Systematic Approach ◽  
Synthesis Method ◽  
Production Costs ◽  
Financial Accounting ◽  
Agile Methodology ◽  
Analysis And Synthesis ◽  
Agile Approach ◽  
Methodological Approaches ◽  
And Control ◽  
Method Of Abstraction

Introduction. The article considers the Agile methodology, its conceptual principless and studies the main accounting aspects of its implementation in realizing the projects of software development. Purpose. The aim of the research consists in studying accounting and control within the framework of Agile-methodology. Method (methodology). The methodological basis of the study is a set of general and specific methods of knowledge of economic phenomena on the basis of systematic approach. In order to ground theoretical and methodological approaches to accounting and analysis of processes which are associated with the formation of production costs we have used method of induction and deduction, method of analysis and synthesis, method of abstraction and analogy. Results. The article analyzes the popularity of practical use of Agile approach and determines the advantages from its use as well as defines the accounting related problems. The ways of eliminating the complications of using the flexible approach in project management in financial accounting are defined.

scholarly journals Proposal and Application of a Methodology to Improve the Control and Monitoring of Complex Hydroelectric Power Station Construction Projects

2020 ◽  
Vol 10 (21) ◽  
pp. 7913
Author(s):  
Paul Urgiles ◽  
Miguel A. Sebastian ◽  
Juan Claver
Keyword(s):  
Construction Projects ◽  
Critical Factor ◽  
Simulation Models ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
Monitoring And Control ◽  
Power Station ◽  
Cost Overruns ◽  
Key Aspects ◽  
And Control

All complex projects take place in environments of great uncertainty. Maintaining a monitoring and control system from the early stages of execution is a critical factor in the success of this type of project. Large hydroelectric power station construction projects are regarded as highly complex because they are affected by factors such as the risks inherent in a variety of fields of engineering, geology and the environment, the long execution times, and the large number of multidisciplinary activities to be carried out in parallel, among others. These types of projects are commonly affected by cost overruns and delays. This work develops a methodology for the monitoring and control of complex construction projects in the hydroelectric sector that enables a periodical calculation of metrics for physical progress, financial progress, and predictions for costs and durations on completion of the project. The verification of the efficiency of this methodology was based on stochastic simulation models applied to real projects in the hydropower sector. The results showed that the proposed methodology improved efficiency compared with existing traditional methodologies. The proposed methodology allows the simultaneous consideration of costs, deadlines, criticality, and risks of the activities of the analyzed projects and also incorporates multicriteria decision techniques to manage the influence of key aspects during the development of the project.

Design and Simulation of Pedal Simulator in Brake by Wire System

2014 ◽  
Vol 556-562 ◽  
pp. 1358-1361 ◽  
Author(s):  
Wen Bo Zhu ◽  
Fen Zhu Ji ◽  
Xiao Xu Zhou
Keyword(s):  
Simulation Models ◽  
Control Algorithms ◽  
Brake Pedal ◽  
Braking System ◽  
Pedal Force ◽  
Performance Requirements ◽  
System A ◽  
Pedal Feel ◽  
And Control ◽  
Wire System

Wire of the brake pedal is not directly connected to the hydraulic environment in the braking By-wire system so the driver has no direct pedal feel. Then pedal simulator is an important part in the brake-by-wire system. A pedal force simulator was designed based on the traditional brake pedal curve of pedal force and pedal travel, AMESim and Matlab / Simulink were used as a platform to build simulation models and control algorithms. The simulation results show that the pedal stroke simulator and the control strategy meet the performance requirements of traditional braking system. It can be used in brake by wire system.

Rotorcraft Lateral-Directional Oscillations: The Anatomy of a Nuisance Mode

2021 ◽  
Author(s):  
Dheeraj Agarwal ◽  
Linghai Lu ◽  
Gareth D. Padfield ◽  
Mark D. White ◽  
Neil Cameron
Keyword(s):  
Simulation Model ◽  
Simulation Models ◽  
Flight Test ◽  
Flight Simulation ◽  
Stability And Control ◽  
Systems Research ◽  
Control Derivatives ◽  
Research Aircraft ◽  
Level Of Understanding ◽  
And Control

High-fidelity rotorcraft flight simulation relies on the availability of a quality flight model that further demands a good level of understanding of the complexities arising from aerodynamic couplings and interference effects. One such example is the difficulty in the prediction of the characteristics of the rotorcraft lateral-directional oscillation (LDO) mode in simulation. Achieving an acceptable level of the damping of this mode is a design challenge requiring simulation models with sufficient fidelity that reveal sources of destabilizing effects. This paper is focused on using System Identification to highlight such fidelity issues using Liverpool's FLIGHTLAB Bell 412 simulation model and in-flight LDO measurements from the bare airframe National Research Council's (Canada) Advanced Systems Research Aircraft. The simulation model was renovated to improve the fidelity of the model. The results show a close match between the identified models and flight test for the LDO mode frequency and damping. Comparison of identified stability and control derivatives with those predicted by the simulation model highlight areas of good and poor fidelity.

scholarly journals Engineering working operations based on parameters of product manufacturability using a computer-aided design algorithm

2022 ◽  
Vol 25 (6) ◽  
pp. 708-719
Author(s):  
D. A. Ishenin ◽  
A. S. Govorkov
Keyword(s):  
Computer Aided Design ◽  
Production Costs ◽  
Machining Process ◽  
Processing Route ◽  
Mechanical Processing ◽  
Design Algorithm ◽  
Industrial Data ◽  
Production Processes ◽  
Computer Aided ◽  
Aided Design

The study aimed to develop an algorithm for computer-aided design (CAD) of working operations. A processing route for machining components was developed based on the criteria of production manufacturability, industrial data and a digital model of the product. The process of machining a workpiece was analysed using a method of theoretical separation. The machining process of a frame workpiece was used as a model. The identified formal parameters formed a basis for developing a CAD algorithm and a model of manufacturing route associated with the mechanical processing of a work-piece applying a condition-action rule, as well as mathematical logic. The research afforded a scheme for selecting process operations, given the manufacturability parameters of a product design. The concept of CAD algorithm was developed to design a production process of engineering products with given manufacturability parameters, including industrial data. The principle of forming a route and selecting a machining process was proposed. Several criteria of production manufacturability (labour intensity, consumption of materials, production costs) were selected to evaluate mechanical processing. A CAD algorithm for designing technological operations considering the parameters of manufacturability was developed. The algorithm was tested by manufacturing a frame workpiece. The developed algorithm can be used for reducing labour costs and development time, at the same time as improving the quality of production processes. The formalisation of process design is a crucial stage in digitalisation and automation of all production processes.

scholarly journals About Systems of Telecontrol – Biotechnology Control

2018 ◽  
pp. 65-67
Author(s):  
Margarita Postnova ◽  
Aleksey Sklyar
Keyword(s):  
Real Time ◽  
Personal Computer ◽  
Central Office ◽  
The Internet ◽  
Production Processes ◽  
Poultry Houses ◽  
Poultry Farms ◽  
Control And Management ◽  
And Control ◽  
Positive Results

Currently, powerful modern poultry farms require built-in logistics with an optimized structure of control and management. Such a system requires formalization and ranking, responding to the tasks of specific divisions of enterprises and poultry farms in general. The analysis of the robots on the Russko-Vysotskaya site shows positive results when the Big Dutchman company introduced the BigFarmNet Manager and AMAKS systems for 11 years of operation of this complex allowing to regulate and control the production processes of egg processing, feeding, drinking, to manage the microclimate of poultry houses in real time from the central office or from a portable personal computer using the Internet.

scholarly journals IMPLEMENTATION OF MANAGERIAL INNOVATIONS IN RUSSIA: DECISIONS’ BACKGROUND, MAJOR AREAS AND FREQUENCY

2020 ◽  
Author(s):  
Natalia Guseva ◽  
◽  
Yaroslav Sovetkin ◽  
Keyword(s):  
Empirical Study ◽  
Systematic Approach ◽  
Effective Communication ◽  
Research Area ◽  
Multinational Companies ◽  
Moscow Region ◽  
Russian Market ◽  
Managerial Practices ◽  
Business Environments ◽  
Key Aspects

Unpredictable, complex and ambiguous business environments compel local and multinational companies to be more flexible and innovative in managerial practices. Nowadays managerial innovations (MI) are becoming a prevailing research area in management worldwide. This study investigates the key aspects of MI implementation in Russia from theoretical and empirical perspectives. The empirical study involved 1 025 employees from 791 companies operating in Moscow and the Moscow region as the major business centers of Russia. The results showed that companies operating in the Russian market base their decision to implement MI mostly on “proprietary investigation” (29% respondents). It was revealed that the major areas of MI implementation for such companies are “motivation” and “effective communication”, which are part of the “soft managerial practices”. Finally, the results of the study showed that in the majority of companies operating in the Russian market, the implementations of MI are made occasionally, without a systematic approach (39% respondents).

scholarly journals Complex Approach to Conceptual Design of Machine Mechanically Extracting Oil fromJatropha curcasL. Seeds for Biomass-Based Fuel Production

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Ivan Mašín ◽  
Michal Petrů
Keyword(s):  
Jatropha Curcas ◽  
Systematic Approach ◽  
Labour Productivity ◽  
Oil Extraction ◽  
Production Costs ◽  
Small Scale ◽  
Efficient Manner ◽  
Technical Problems ◽  
Complex Approach ◽  
Small Scale Farmers

One of important sources of biomass-based fuel isJatropha curcasL. Great attention is paid to the biofuel produced from the oil extracted from theJatropha curcasL. seeds. A mechanised extraction is the most efficient and feasible method for oil extraction for small-scale farmers but there is a need to extract oil in more efficient manner which would increase the labour productivity, decrease production costs, and increase benefits of small-scale farmers. On the other hand innovators should be aware that further machines development is possible only when applying the systematic approach and design methodology in all stages of engineering design. Systematic approach in this case means that designers and development engineers rigorously apply scientific knowledge, integrate different constraints and user priorities, carefully plan product and activities, and systematically solve technical problems. This paper therefore deals with the complex approach to design specification determining that can bring new innovative concepts to design of mechanical machines for oil extraction. The presented case study as the main part of the paper is focused on new concept of screw of machine mechanically extracting oil fromJatropha curcasL. seeds.

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