Rational Design Automation by Dichromatic Graphs

2001 ◽  
Author(s):  
Jose Martinez Escanaverino ◽  
Jose A. Llamos Soriz ◽  
Alejandra Garcia Toll ◽  
Tania Ortiz Cardenas
Keyword(s):  
Design Automation ◽  
Rational Design ◽  
Mechanical Design ◽  
Real Life ◽  
Planetary Gear ◽  
Digit Number ◽  
Design Procedures ◽  
Plant Maintenance ◽  
Computational Problem Solving ◽  
The Mathematical Model

Abstract As the complexity of mechanical design increases, due to larger size mathematical models, the need for rational design procedures also goes up. As shown elsewhere, dichromatic graphs have proven their value as tools for the algorithmic education of mechanical engineers. This paper analyzes the worth of such graphs as a means to achieve rational design solutions in complex industrial problems. The paper covers plant maintenance and research & development professional case studies. A real-life problem in electromechanical system reengineering is the first application example. Attention is also given in the paper on the partitioning of large problems, involving many variables and relations. The design of a planetary gear unit, with a three-digit number of elements in the mathematical model, is an example problem in this area. In addition, changes and extensions to the computational problem solving theory are included.

scholarly journals Research on feeder network design: a case study of feeder service for the port of Kotka

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Yisong Lin ◽  
Xuefeng Wang ◽  
Hao Hu ◽  
Hui Zhao
Keyword(s):  
Control System ◽  
Numerical Experiment ◽  
Network Design ◽  
Evaluation System ◽  
Real Life ◽  
Objective Evaluation ◽  
Multi Objective Optimization ◽  
Real Life Data ◽  
The Mathematical Model

Abstract By exemplifying the feeder service for the port of Kotka, this study proposed a multi-objective optimization model for feeder network design. Innovative for difference from the single-objective evaluation system, the objective of feeder network design was proposed to include single allocation cost, intra-Europe cargo revenue, equipment balance, sailing cycle, allocation utilization, service route competitiveness, and stability. A three-stage control system was presented, and numerical experiment based on container liner’s real life data was conducted to verify the mathematical model and the control system. The numerical experiment revealed that the three-stage control system is effective and practical, and the research ideas had been applicable with satisfactory effect.

scholarly journals A Pot-Like Vibrational Microfluidic Rotational Motor

Micromachines ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 177
Author(s):  
Suzana Uran ◽  
Matjaž Malok ◽  
Božidar Bratina ◽  
Riko Šafarič
Keyword(s):  
Mathematical Model ◽  
Rotational Speed ◽  
Mechanical Energy ◽  
Real Life ◽  
Frequency Region ◽  
Theoretical Research ◽  
Practical Challenge ◽  
The Mathematical Model ◽  
Motor Structure ◽  
Proper Balance

Constructing a micro-sized microfluidic motor always involves the problem of how to transfer the mechanical energy out of the motor. The paper presents several experiments with pot-like microfluidic rotational motor structures driven by two perpendicular sine and cosine vibrations with amplitudes around 10 μm in the frequency region from 200 Hz to 500 Hz. The extensive theoretical research based on the mathematical model of the liquid streaming in a pot-like structure was the base for the successful real-life laboratory application of a microfluidic rotational motor. The final microfluidic motor structure allowed transferring the rotational mechanical energy out of the motor with a central axis. The main practical challenge of the research was to find the proper balance between the torque, due to friction in the bearings and the motor’s maximal torque. The presented motor, with sizes 1 mm by 0.6 mm, reached the maximal rotational speed in both directions between −15 rad/s to +14 rad/s, with the estimated maximal torque of 0.1 pNm. The measured frequency characteristics of vibration amplitudes and phase angle between the directions of both vibrational amplitudes and rotational speed of the motor rotor against frequency of vibrations, allowed us to understand how to build the pot-like microfluidic rotational motor.

scholarly journals SIMULATION AND SENSITIVITY ANALYSIS ON THE PARAMETER OF NON-TARGETED IRRADIATION EFFECTS MODEL

2018 ◽  
Vol 81 (1) ◽  
Author(s):  
Muhamad Hanis Nasir ◽  
Fuaada Mohd Siam
Keyword(s):  
Mathematical Model ◽  
Sensitivity Analysis ◽  
Real Life ◽  
Double Strand Breaks ◽  
Signal Molecules ◽  
Danger Signal ◽  
Survival Fraction ◽  
Strand Breaks ◽  
Radiation Induced ◽  
The Mathematical Model

Real-life situations showed damage effects on non-targeted cells located in the vicinity of an irradiation region, due to danger signal molecules released by the targeted cells. This effect is widely known as radiation-induced bystander effects (RIBE). The purpose of this paper is to model the interaction of non-targeted cells towards bystander factors released by the irradiated cells by using a system of structured ordinary differential equations. The mathematical model and its simulations are presented in this paper. In the model, the cells are grouped based on the number of double-strand breaks (DSBs) and mis-repair DSBs because the DSBs are formed in non-targeted cells. After performing the model's simulations, the analysis continued with sensitivity analysis. Sensitivity analysis will determine which parameter in the model is the most sensitive to the survival fraction of non-targeted cells. The proposed mathematical model can explain the survival fraction of non-targeted cells affected by the bystander factors.

The IFBMDA: A Model for Mechanical Design Automation

1992 ◽  
Author(s):  
Dongming Lu ◽  
Shouqian Sun ◽  
Zhijun He
Keyword(s):  
Design Process ◽  
Information Flow ◽  
Design Automation ◽  
Flow Model ◽  
Mechanical Design ◽  
Cognitive Model ◽  
Knowledge Processing ◽  
Constraint Generation ◽  
Process Stage ◽  
Information Flow Model

Abstract The IFBMDA is an Information-Flow-Based model for Mechanical Design Automation. This paper first analyzes the mechanical design process from the views of design methodology and cognitive model. Then, two essential assumptions about mechanical design behavior are provided. Based on the analysis and fundamental assumptions, this paper thoroughly describes five submodels which constitute the automation model IFBMDA. They are Information Flow model, Knowledge Processing model, Non-monotonic Expansion Search model, Iterative Constraint Generation and Solution model and Design Process Stage model. Then, this paper also evaluates the model in both practical and theoretical aspects and shows that it is well-developed in both aspects. Finally, the perspective of further mechanical design automation research is outlined.

Optimal H∞ Control of Structural Vibrations Using Shape Memory Alloy Actuators

1999 ◽  
Author(s):  
Jian Sun ◽  
Ali R. Shahin
Keyword(s):  
Mathematical Model ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Model Uncertainty ◽  
High Frequency ◽  
Structural Vibrations ◽  
Design Procedures ◽  
Sma Actuators ◽  
Temperature Dynamics ◽  
The Mathematical Model

Abstract This paper investigates robust control problem of structural vibrations using shape memory alloy (SMA) wires as actuators. The mathematical model for these SMA actuators is derived with emphasis in model uncertainty. The linearization of the relation between stress and temperature dynamics of SMA actuators is analyzed for active control. To handle the uncertainties caused by the linearization and the neglected high frequency dynamics, optimal H∞ control was employed to design a controller. An example is used to demonstrate the design procedures and the control system is tested in a nonlinear environment.

Business Students as End-User Developers

2011 ◽  
pp. 2886-2894
Author(s):  
Sandra Barker
Keyword(s):  
Incomplete Information ◽  
Case Studies ◽  
Business Students ◽  
Good Practice ◽  
Real Life ◽  
End User ◽  
Design Procedures ◽  
Design Issue ◽  
Undergraduate Business Students ◽  
Insight Into

In this chapter, the introduction of “real-life” scenarios to undergraduate business students to enhance their understanding of end-user development of databases is investigated. The problems experienced with end-user development due to incomplete information, incorrect design procedures, and inadequate software knowledge are identified. It is the hope of the author that by identifying the design issue relevant to good database production and using “real-life” case studies as insight into how businesses use and store data, the students will be more aware of good practice for their future employment.

Business Students as End-User Developers

2003 ◽  
pp. 304-312 ◽  
Author(s):  
Sandra Barker
Keyword(s):  
Incomplete Information ◽  
Case Studies ◽  
Business Students ◽  
Good Practice ◽  
Real Life ◽  
End User ◽  
Design Procedures ◽  
Design Issue ◽  
Undergraduate Business Students ◽  
Insight Into

In this chapter, the introduction of “real-life” scenarios to undergraduate business students to enhance their understanding of end-user development of databases is investigated. The problems experienced with end-user development due to incomplete information, incorrect design procedures, and inadequate software knowledge are identified. It is the hope of the author that by identifying the design issue relevant to good database production and using “real-life” case studies as insight into how businesses use and store data, the students will be more aware of good practice for their future employment.

Dynamic response of bridges under travelling loads

1993 ◽  
Vol 20 (2) ◽  
pp. 287-298 ◽  
Author(s):  
J. L. Humar ◽  
A. M. Kashif
Keyword(s):  
Dynamic Response ◽  
Rational Design ◽  
Weight Ratio ◽  
Experimental Investigations ◽  
Speed Ratio ◽  
Force Model ◽  
Beam Model ◽  
Dynamic Amplification Factor ◽  
Design Procedures ◽  
Dynamic Amplification

In spite of a number of analytical and experimental investigations on the dynamic response of bridges to moving vehicle loads, the controlling parameters that govern the response have not been clearly identified. This has, in turn, inhibited the development of rational design procedures. Based on an analytical investigation of the response of a simplified beam model traversed by a moving mass, the present study identifies the governing parameters. The results clearly show why attempts to correlate the response to a single parameter, either the span length or the fundamental frequency, are unsuccessful. Simple design procedures are developed based on relationships between the speed ratio, the weight ratio, and the dynamic amplification factors; and a set of design curves are provided. Key words: dynamic response of bridges, vehicle–bridge interaction, moving force model, moving sprung mass model, dynamic amplification factor.

Particle Swarm Optimization Based Algorithm for Ship Vertical Passage Layout Optimization

2012 ◽  
Vol 479-481 ◽  
pp. 1885-1888
Author(s):  
Wen Quan Wang ◽  
Sheng Huang ◽  
Yu Long Hu ◽  
Yuan Hang Hou
Keyword(s):  
Particle Swarm Optimization ◽  
Rational Design ◽  
Particle Swarm Optimization Algorithm ◽  
Particle Swarm ◽  
Vital Role ◽  
Layout Problem ◽  
Swarm Optimization ◽  
Operation And Maintenance ◽  
Simulation Results ◽  
The Mathematical Model

The passage plays a vital role in operation and maintenance of naval ships. The rational design of the passage could increase the efficiency of combat logistics, life-cycle logistics and personnel movement under combat and emergency conditions. Borrowing ideas from facility layout, the model of optimal vertical passage layout was established to formulation the vertical passage layout problem. The Floyd’s algorithm was used to calculate the distance between two compartments and the particle swarm optimization algorithm was proposed to solve the mathematical model. From simulation results, the model and methods are feasible for the vertical passage layout problem.

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