International Journal of Systems Applications, Engineering & Development

ISSN: 2074-1308
Volume 13, 2019

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Volume 13, 2019


Title of the Paper: Studies Regarding Finishing and Work Hardening the Internal Surfaces by Radial Vibratory Rolling Method

 

Authors: Badea Lepadatescu

Pages: 46-50

Abstract: The paper presents a series of studies regarding the influence of the main constructive and cinematic parameters of the finishing-work hardening tools, on the durability of these tools and on the productivity of the manufacturing process. Thus, is studying the influence of the diameter of the rolling elements (balls) and the angle of the pressure cones "α" on the productivity of the machining, as well as the influence of the ratio between the pulsation of the rolling elements and the rolling speed, on the distribution of the unitary efforts, respectively on the durability of the tools used.


Title of the Paper: The Acceleration or Deceleration Curve of the Kinematical Linkage of the Numerical Control Machine

 

Authors: Ioan Enescu

Pages: 42-45

Abstract: The transient duty has a very important role within the kinematical linkages of the numerical control machine tools and industrial robots. The acceleration and deceleration of the movable element of the kinematical linkage participates directly to achieving the positioning accuracy and to the path error. This work presents the main shapes of the acceleration- deceleration curve of the kinematical linkage, as well as their performances. Shapes of the acceleration-deceleration curve are presented for positioning linkages as well as for contouring linkages. The extent of influence upon the contour error in case of the linear and exponential acceleration-deceleration of kinematical linkage is also presented. The works is also giving recommendations on the way of choosing the type of curve being used in case of various transient processes, by the machine tool builders, with a view to obtaining high dynamical performances. In general, the recommendations are considering the inertia of the mobile element and the imposed path error. By knowing the acceleration shape, the machine tool designer and builder can know, even from the design stage, the area of the transient duty where the acceleration is maximal. The maximum acceleration imposes the rate of the impulsion torque of the drive servomotor based on which the kinematical linkage is sized, in terms of its components.


Title of the Paper: Model of Servo Drive System to Increase Performance of Machine Tools

 

Authors: Ioan Ghimbaseanu

Pages: 32-41

Abstract: In the application of mechatronic positioning systems (also known as CNC axes) it is desirable to predict the servo performance. By using computer simulation techniques it is possible to construct a very accurate model of the servo drive. It is possible to observe the effect on performance by changing the drive parameters such as load inertia, backlash, stick-slip, viscous friction, load thrust, servo loop gains, velocity and acceleration. This paper deals with a model of a numerically controlled mechatronic system which consists of a motion control system driven by a D.C. motor. Both position and velocity feedback loops are present in the structure of the system. By means of MATLAB & Simulink software, simulation diagrams were built in order to test the behavior of the system in positioning regime. An analytic tuning of the position controller was performed prior to the simulation. Two velocity profile were used for testing the position behavior of the system: the trapezoidal profile and the parabolic one. The results in the case of the parabolic velocity profile were satisfactory: even if the positioning error has quite a high value it was constant and easy to compensate by introducing it as an offset value in the memory of the NC equipment. The analytic tuning, however, fails in the case of the trapezoidal profile. The system oscillates a lot and the positioning error was inconstant and subsequently cannot be compensated. In order to compensate the behavior of the system two solutions were adopted: re-tuning of the position controller using the “continuous emulation tuning method” and using a 16 bit DAC instead of a 14 bit one. The compensated system performed well during the simulation in both cases, the trapezoidal profile being usable in this case with satisfactory results.


Title of the Paper: Researches on Cutting Tools Which Have the Cutting Surface Made of Polycrystalline Diamond

 

Authors: Mihaela Popescu

Pages: 28-31

Abstract: The multitude of cutting materials already in existence increased further with the appearance of polycrystalline diamond (PCD) some 25 years ago. Ceramic show no chemical affinity to most machining materials, but are very brittle. Natural diamond, the hardest known material, is very wear resistant, but also sensitive to impacts and difficult to shape. The main advantage brought about by the development of polycrystalline diamond is the partial combination of the exceptional hardness of diamond with the toughness of tungsten carbide. This paper is presenting a series of the general considerations on cutting tools which have the cutting surface made of polycrystalline diamond. There are also presented some original results concluded by the author, based on experiments made with the tools mentioned before, which have different design values.


Title of the Paper: Hidden Human Detecting Behind a Concrete Wall by using Microwave Imaging

 

Authors: Lotfi Merad, Laarej Merad, Sidi Mohammed Chouiti, Sidi Mohammed Meriah

Pages: 25-27

Abstract: In microwave imaging systems, high resolution and good penetration of the electromagnetic (EM) waves inside materials are required. The work presented in this article is based on the use of image processing methods in order to reduce the noise that occurs in reconstructed images from a microwave imaging systems. The goal is to apply processing operations such as dilation and erosion on the reconstructed image. The focus has been on the detection of a human being hidden behind a wall. Simulation results show an improvement in image quality compared to the original image and a significant reduction in noise.


Title of the Paper: Applying Cell Transmission Model for Solving Urban Traffic Jams

 

Authors: Y. S. Huang, C. C. Ho, B. Y. Xie

Pages: 20-24

Abstract: Cell transmission model (CTM) is useful for evaluating the performance of urban traffic networks due to its mathematical formalism. This work explores an extend traffic control policy for dispersing the problem of the incident-based traffic jams. For this purpose, the authors employ CTM to analyse of an urban traffic jam problem. CTM is useful for evaluating the performance of urban traffic networks due to its mathematical formalism. In this paper, the MATLAB platform is used to design a traffic simulation tool based on CTM, which successfully simulates the propagation and dispersion of traffic congestion caused by an accident. This work explores the application of CTM to develop control strategies for dispersion accident-induced traffic jams and evaluates the efficiency of these strategies.


Title of the Paper: Prevention of Work Accidents and Occupational Risk

 

Authors: Dumitrascu A. E.

Pages: 15-19

Abstract: In the present paper are detailed the processes for identifying the risk factors, assessing and prioritizing the specific professional risks in order to identify and establish measures meant to protect the health and ensure the safety of the workers. The case study refers to the identification of the professional risk factors specific to the analyzed process, their quantification, monitoring and control in order to prevent occupational accidents and diseases. The results of the assessment indicate that the estimated level of risk for the three components of the analyzed system of work generates risks of occupational and professional health that exceed the acceptable level.


Title of the Paper: Access of Visually Impaired People to Cultural and Historical Heritage using Braille Visualization

 

Authors: D. Karastoyanov, N. Stoimenov

Pages: 10-14

Abstract: The paper presents a new technology for access of visually impaired people to graphical information using Braille display. In the state of the art are shown different existing devices, realized ideas and conceptual models. The technology for graphical Braille display on the base of linear electromagnetic micro drives is shortly described. Previous experience of the team is shown, including tactile tiles representing tapestries of “Pavia Battle 1525”. Future steps for development of the described above Braille display technology are considered.


Title of the Paper: Measurements of Particle Emissions and Size Distributions from a Modern Residential Pellet Stove under Laboratory Conditions

 

Authors: M. Obaidullah, S. Bram, J. De Ruyck

Pages: 1-9

Abstract: This paper presents experimental results of particle emissions obtained from a modern bottom feed pellet stove of 5 kW output in nominal heat and 2.5 kW in part load output using a state of the art instrument Electrical Low Pressure Impactor Plus (ELPI+) with the fourteen stages from 6 nm to 10 µm. The combustion experiments were conducted in a stove manufacturing plant in the southern part of Belgium. Two experiments (A and B) in part load and four experiments (C, D, E and F) in nominal load output were conducted for the emissions measurements. The stove was operated in different fan speeds, which regulate air flow into the combustion chamber. The particle emission results include of mass concentrations of two size fractions PM1 and PM2.5, number concentrations and their particle size distributions evaluated in this paper. The experimental results show that the PM1, PM2.5 and particle number concentrations vary from one experiments to another due to the difference of fuel consumption, different fan speed settings of the screw, which regulate air flow into the combustion chamber. Particle mass size distributions analysis show that all the experiments have maximum particle concentrations in the fine mode mainly at the particle size about 320 nm for the startup and combustion phase and 300 nm for the burnout phase. Particle number size distributions analysis show that the peak particle concentration was observed for all the experiments between 25 nm to 70 nm for startup phase, 70 nm to 100 nm for the combustion phase and 20 nm to 80 nm for the burnout phase.