scholarly journals DESIGN ASPECTS OF INSTALLATION DEVICES OF THE SUPPORT RINGS

2021 ◽  
Vol 28 (3) ◽  
pp. 51-63
Author(s):  
Alexei Botez ◽  
◽  
Elena Rusu ◽  
Keyword(s):  
Optimal Design ◽  
Manufacturing Processes ◽  
Design Calculation ◽  
Joint Orientation ◽  
Automatic Installation ◽  
Advantages And Disadvantages ◽  
Transverse Profile ◽  
Minimum Number ◽  
Fixed End ◽  
Supporting Ring

The processes of manufacturing machines and appliances show a continuous tendency to increase the degree of automation. An important role in the automation of manufacturing processes is played by the constructive technologicality of the product. It is important to use a minimum number of components, which have a construction as technological as possible in terms of automation. In this context, the use of supporting rings as fasteners is welcome. The design of the installation devices of these rings requires the knowledge of their deformation forces, information that is missing in the profile literature. The authors set their goal to develop the method for calculating the forces required to deform the supporting rings with a rectangular transverse profile and their maximum allowable deformations. The calculation relationships were obtained by formalizing the supporting ring through a bar with a fixed end and studying its deformation using Mohr's integral. The article lists some types of the supporting rings used in the construction of machines and appliances, their advantages and disadvantages, aspects of their automatic installation: deformation and installation methods, precision of joint orientation, optimal design, calculation of forces required for deformation and the maximum permissible deformation value. As a result of the research carried out, recommendations were developed regarding the calculation of some constructive parameters of the devices for installing the supporting rings.

Settings, Experimentation and Evaluation of the Simulation Models

2013 ◽  
Vol 309 ◽  
pp. 366-371 ◽  
Author(s):  
František Manlig ◽  
Radek Havlik ◽  
Alena Gottwaldova
Keyword(s):  
Simulation Model ◽  
New Technology ◽  
Simulation Models ◽  
Manufacturing Processes ◽  
Customer Requirements ◽  
Evaluation Functions ◽  
Operational Management ◽  
Minimum Number ◽  
User Friendly ◽  
Setting Parameters

This paper deals with research in computer simulation of manufacturing processes. The paper summarizes the procedures associated with developing the model, experimenting with and evaluating the model results. The key area is of experimentation with the simulation model and evaluation using indicators or multi-criteria functions. With regards to the experiment the crucial variables are the simulation model. The key ideas are to set the number of variables, depending on what a given simulation will be. For example, when introducing new technology into production, modify the type of warehouse, saving workers, thus economizing. The simulation models for the operational management uses simplified models, if possible, a minimum number of variables to obtain the result in shortest possible time. These models are more user friendly and the course will be conducted mostly in the background. An example of a criteria function is the number of parts produced or production time. Multi-criteria function has given us the opportunity to make better quality decisions. It is based on the composition of several parameters, including their weight to one end point. The type of evaluation functions, whether it is an indicator or criteria function is selected and based on customer requirements. In most cases it is recommended to use the multi-dimensional function. It gives us a more comprehensive view of the results from the model and facilitates decision-making. The result of this paper is a display of setting parameters for the experimentation on a sample model. Furthermore, the comparisons of results with a multi-criteria objective function and one-criterion indicator.

Systematic Construction of the Equations of Motion for Multibody Systems Containing Closed Kinematic Loops

1989 ◽  
Author(s):  
P. E. Nikravesh ◽  
G. Gim
Keyword(s):  
Equations Of Motion ◽  
Transformation Matrix ◽  
Velocity Transformation ◽  
Constraint Equations ◽  
Advantages And Disadvantages ◽  
Lagrange Multiplier Technique ◽  
Joint Coordinates ◽  
Minimum Number ◽  
Kinematic Loops ◽  
Equations Of Motions

Abstract This paper presents a systematic method for deriving the minimum number of equations of motion for multibody system containing closed kinematic loops. A set of joint or natural coordinates is used to describe the configuration of the system. The constraint equations associated with the closed kinematic loops are found systematically in terms of the joint coordinates. These constraints and their corresponding elements are constructed from known block matrices representing different kinematic joints. The Jacobian matrix associated with these constraints is further used to find a velocity transformation matrix. The equations of motions are initially written in terms of the dependent joint coordinates using the Lagrange multiplier technique. Then the velocity transformation matrix is used to derive a minimum number of equations of motion in terms of a set of independent joint coordinates. An illustrative example and numerical results are presented, and the advantages and disadvantages of the method are discussed.

Design and Simulation of Molded Interconnect Devices with Two Shot Molding

2011 ◽  
Vol 295-297 ◽  
pp. 1651-1655
Author(s):  
Yong Zhuo ◽  
Juan Peng ◽  
Yan Jun Wu
Keyword(s):  
Optimal Design ◽  
Three Dimensional ◽  
Manufacturing Processes ◽  
Specific Design ◽  
Product Model ◽  
Simulation Tools ◽  
Integrated Environment ◽  
Feature Technology ◽  
Effective Design ◽  
Molded Interconnect Devices

Three Dimensional Molded Interconnect Devices (3D-MID) has enormous potential for rationalization in both manufacturing process and the freedom to design of mechatronic products. Two shot molding is one of the most important and commonly used methods among the various MID manufacturing processes. Currently, there is a lack of effective design and simulation tools that can be used for MID with two shot molding. In this paper, an integrated product model using feature technology, some MID-specific design functions, and one special interface based on the API of Moldflow Plastics Insight (MPI) and the COM-Technology are presented. These developed product model, functions and interface increase the efficiency of the MID design process, and the design and simulation integrated environment also towards the rational and optimal design of MID products with two shot molding.

scholarly journals Analysis and characterization of additive manufacturing processes

2021 ◽  
Vol 13 (4) ◽  
pp. 167-180
Author(s):  
Andra TOFAN-NEGRU ◽  
Cristian BARBU ◽  
Amado STEFAN ◽  
Ioana-Carmen BOGLIS
Keyword(s):  
Additive Manufacturing ◽  
Complex Geometry ◽  
Cutting Tools ◽  
Manufacturing Processes ◽  
Layer By Layer ◽  
Advantages And Disadvantages ◽  
Finishing Processes ◽  
Short Time ◽  
Physical Phenomena ◽  
Am Processes

Recently, additive manufacturing (AM) processes have expanded rapidly in various fields of the industry because they offer design freedom, involve layer-by-layer construction from a computerized 3D model (minimizing material consumption), and allow the manufacture of parts with complex geometry (thus offering the possibility of producing custom parts). Also, they provide the advantage of a short time to make the final parts, do not involve the need for auxiliary resources (cutting tools, lighting fixtures or coolants) and have a low impact on the environment. However, the aspects that make these technologies not yet widely used in industry are poor surface quality of parts, uncertainty about the mechanical properties of products and low productivity. Research on the physical phenomena associated with additive manufacturing processes is necessary for proper control of the phenomena of melting, solidification, vaporization and heat transfer. This paper addresses the relevant additive manufacturing processes and their applications and analyzes the advantages and disadvantages of AM processes compared to conventional production processes. For the aerospace industry, these technologies offer possibilities for manufacturing lighter structures to reduce weight, but improvements in precision must be sought to eliminate the need for finishing processes.

scholarly journals Overview of the Optimal Design of the Electrically Excited Doubly Salient Variable Reluctance Machine

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 228
Author(s):  
Yao Zhao ◽  
Chuanyang Lu ◽  
Dongdong Li ◽  
Xing Zhao ◽  
Fan Yang
Keyword(s):  
Optimal Design ◽  
Optimization Design ◽  
Basic Structure ◽  
Optimization Methods ◽  
Advantages And Disadvantages ◽  
Variable Reluctance ◽  
Reluctance Machine ◽  
Doubly Salient ◽  
New Type ◽  
Salient Variable

The Electrically Excited Doubly Salient Variable Reluctance Machine (EEDSVRM) is a new type of brushless machine designed according to the principle of air gap reluctance change. There is neither permanent magnet steel nor excitation winding on the rotor. The rotor is made of silicon steel sheets, thus the structure of the variable reluctance machine is very simple. There are many optimization methods for this type of machine optimal design, such as novel machine topology optimization, finite element simulation-based optimization, mathematical analysis-based optimization, intelligent algorithm-based optimization, and multiple fusion-based optimization. Firstly, this article introduces the basic structure and working principle of the EEDSVRM and analyzes both its common regularity and individual difference. Then, the different optimization design methods of EEDSVRM are reviewed, the advantages and disadvantages of the different optimization methods are summarized, and the research interests of the optimization design of variable reluctance machines in the future are prospected.

SLS unter die Lupe genommen*/SLS under the microscope – An evaluation of the accuracy of selective laser sintering processes

2015 ◽  
Vol 105 (01-02) ◽  
pp. 72-77
Author(s):  
M. Fleßner ◽  
B. Galovskyi ◽  
T. Hausotte ◽  
A. Loderer
Keyword(s):  
Optimal Design ◽  
Measurement System ◽  
Manufacturing Process ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Manufacturing Processes ◽  
Wird Eine ◽  
Sintering Process ◽  
Batch Sizes ◽  
Sintering Processes

Generative Fertigungsverfahren erlauben die wirtschaftliche Fertigung auch kleiner Losgrößen. Um diesen Vorteil durch eine gute Qualität zu sichern, wird eine Messtechnik entwickelt, welche die Kontrolle des Werkstücks schon während des Bauprozesses ermöglicht. Für eine optimale Auslegung der Messtechnik wird ein Vorgehen zur Genauigkeitsanalyse am Beispiel eines selektiven Lasersinterprozesses durchgeführt. Darüber hinaus werden die auftretenden systematischen Abweichungen untersucht.   Generative manufacturing processes allow an economical production of small batch sizes. In order to ensure this advantage by good quality, a measurement system is in development which is able to monitor the workpiece during the manufacturing process. For an optimal design of the measurement system, an approach is presented for the evaluation of the accuracy on the example of a selective laser sintering process, followed by an analysis of the detected systematical deviations.

Concept of a Dome House for the Village

2019 ◽  
pp. 28-31
Keyword(s):  
Alternative Energy ◽  
Residential Buildings ◽  
Point Of View ◽  
Design Calculation ◽  
Advantages And Disadvantages ◽  
Alternative Energy Sources ◽  
Metal Frame ◽  
The Village ◽  
Minimum Surface Area ◽  
Almost Continuous

The article discusses dome-type houses from the point of view of the concept of energy efficiency, energy saving and multi-functionality. The review of foreign and domestic experience in the design and construction of residential buildings, which are based on the dome cover, is presented. On the basis of this review, it is concluded that there is no unified design, calculation, production and technological regulatory framework. The advantages and disadvantages of dome houses are given. It is noted that the most suitable materials for creating the dome cover is a metal frame and almost continuous glazing. It is revealed that the dome design has a minimum surface area, which makes it possible to save up to 20 % of energy costs for its maintenance. The concept of a dome house combining the function of housing and a "winter garden" has been proposed. In addition, when creating a vegetarian house, other important agricultural and ecological problems are solved, the use of alternative energy sources for example. The article outlines the prospects for the development of this concept.

Technique Employing Topology Optimisation to Determine Panel-to-Panel Support Bracket Positions in a Spacecraft Body

2019 ◽  
pp. 4-19
Author(s):  
A.A. Borovikov ◽  
A.G. Leonov ◽  
O.N. Tushev
Keyword(s):  
Real Time ◽  
Structural Design ◽  
Pilot Project ◽  
Topology Optimisation ◽  
Advantages And Disadvantages ◽  
Design Engineers ◽  
Minimum Number ◽  
Early Design Stages ◽  
Design Options ◽  
Further Development

The paper presents a real-time technique for determining the minimum number of panel-to-panel support brackets in an unpressurised spacecraft body and their installation positions employing topology optimisation in order to satisfy the dynamic compatibility requirements between the spacecraft and its launch vehicle. These support brackets connect honeycomb panels of the spacecraft body, which form the foundation of its structural design. The technique should be used at early design stages (such as pilot project and draft design) to generate structural design options in real time. We provide a general approach to using the technique as well as its detailed description based on a test problem example utilising the MSC. Patran/Nastran software package. We stated the optimisation problem mathematically and described its parameter selection. We list primary advantages and disadvantages of this technique as compared to the classical use of topology optimisation. Results obtained via the technique proposed may be used as guidelines for design engineers developing design documentation. The paper also outlines potential further development of the technique.

Identification of the Optimal Design and its Production Process for One-of-a-Kind Production

2008 ◽  
Vol 44-46 ◽  
pp. 607-617
Author(s):  
G. Hong ◽  
P. Dean ◽  
W. Yang ◽  
Y.L. Tu ◽  
D. Xue
Keyword(s):  
Optimal Design ◽  
Product Design ◽  
Process Parameters ◽  
Mass Production ◽  
Manufacturing Process ◽  
Production Efficiency ◽  
Product Family ◽  
Manufacturing Processes ◽  
Customer Requirements ◽  
Optimal Product Design

One-of-a-kind production (OKP) is a new manufacturing paradigm to produce customized products based on requirements of individual customers while maintaining the quality and efficiency of mass production. In this research, a computer-aided optimal product design and process planning approach is developed to support OKP product design and manufacture to satisfy individual customer requirements with near to mass production efficiency. In this work, a hybrid AND-OR graph is developed to model the variations of design configurations/parameters and manufacturing processes/parameters in generic product family. Since different design configurations and parameters can be created from the same customer requirements, and each design can be further achieved through alternative manufacturing processes and parameters, co-evolutionary genetic programming and numerical optimization are employed to identify the optimal product design configuration/parameters and manufacturing process/parameters. A case study to identify the optimal design configuration/parameters and manufacturing process/parameters of custom window products in an industrial company is introduced to demonstrate the effectiveness of the developed method.

DESIGN OF CONTROLLABLE LEADER–FOLLOWER NETWORKS VIA MEMETIC ALGORITHMS

2021 ◽  
pp. 2150004
Author(s):  
SHAOPING XIAO ◽  
BAIKE SHE ◽  
SIDDHARTHA MEHTA ◽  
ZHEN KAN
Keyword(s):  
Genetic Algorithms ◽  
Optimal Design ◽  
Optimization Problems ◽  
Memetic Algorithms ◽  
Networked Systems ◽  
Efficiency And Effectiveness ◽  
Minimum Number ◽  
Simulation Results ◽  
Leader Selection ◽  
Network Controllability

In many engineered and natural networked systems, there has been great interest in leader selection and/or edge assignment during the optimal design of controllable networks. In this paper, we present our pioneering work in leader–follower network design via memetic algorithms, which focuses on minimizing the number of leaders or the amount of control energy while ensuring network controllability. We consider three problems in this paper: (1) selecting the minimum number of leaders in a pre-defined network with guaranteed network controllability; (2) selecting the leaders in a pre-defined network with the minimum control energy; and (3) assigning edges (interactions) between nodes to form a controllable leader–follower network with the minimum control energy. The proposed framework can be applied in designing signed, unsigned, directed, or undirected networks. It should be noted that this work is the first to apply memetic algorithms in the design of controllable networks. We chose memetic algorithms because they have been shown to be more efficient and more effective than the standard genetic algorithms in solving some optimization problems. Our simulation results provide an additional demonstration of their efficiency and effectiveness.

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