10 Articles Published

1. PREDICTION OF BEARING REMAINING USEFUL LIFE BASED ON EUCLIDEAN DISTANCE USING AN ARTIFICIAL NEURAL NETWORK APPROACH

Authors: DALIA M. AMMAR , ELSAYED S. ELSAYED , MOHAMMAD A. YOUNES

Abstract: Accurate prediction of Remaining Useful Life (RUL) of machines and machine components is very important for reliability evaluation. This paper proposes an Artificial Neural Network (ANN) as a method for accurate prediction of RUL of bearings based on vibration measurements during an accelerated life test. The input features to the neuro-predictor are: the vibration signal in the time domain, the dominant harmonics of the bearing vibration signal expressed in a set of selected coefficients of the discrete cosine transforms (DCT), and the main harmonics of the vibration signal as expressed by Fast Fourier Transform (FFT).The Euclidean distance which is a measure of time to failure based on RMS value is used as the figure of merit for the validation of the ANN. Henceforth; the RUL of the bearing can be predicted as the output of the neuro-predictor. The results prove that the suggested methodology can successfully be applied for prediction of bearing RUL.

Keywords: Remaining Useful Life (RUL), Reliability evaluation, Artificial Neural Network (ANN), Discrete Cosine Transform (DCT), Machine Tool Dynamics.

Pages: 5 - 11 | DOI: 10.15224/978-1-63248-123-8-15

2. ADVANCED DESIGN AND MANUFACTURE OF SPIRAL BEVEL, HYPOID, AND WORM GEARS

Authors: VILMOS SIMON

Abstract: A method is presented for the optimization of design and manufacture of spiral bevel, hypoid, and worm gears. The aim of the optimization is to improve the operating characteristics of the gear pair, namely, to increase the service life of gears and to reduce the dynamic effects of gear mesh. Optimal modifications are introduced into the tooth surfaces to simultaneously reduce the maximum tooth contact pressure and transmission errors. These modifications are introduced by applying optimal machine tool settings and geometry of cutting tool in the manufacturing process. The method is demonstrated on spiral bevel, hypoid, and worm gears. The obtained results have shown that significant improvements in the operating characteristics of the gear pairs are achieved.

Keywords: gears, design, manufacture, optimization

Pages: 12 - 16 | DOI: 10.15224/978-1-63248-123-8-16

3. SIMULTANEOUS SATISFACTORY DESIGN OF STRUCTURAL AND CONTROL SYSTEMS BY SET-BASED DESIGN METHOD

Authors: AIGUO MING

Abstract: The design method capable of simultaneously considering the factors related to control system and structural system, and satisfying the multiple design objects as well is proposed. This problem has usually trade-off factors and complex design situation. One of set-based design methods, preference set-based design (PSD), is applied to the simultaneous design problem of the arm structure with stepped shape under rotational motion. In PSD method, the design variables and performance variables are represented by interval set with designer’s preference function and, solution sets are obtained considering high robustness and satisfaction of required performances. Simulation using PID controller in control engineering is performed. As a result, by using PSD method, each interval set of multiple design parameters related to the shape of the arm and the control system is obtained simultaneously satisfying multiple required performances appropriately.

Keywords: simultaneous design, set-based design, vibration control, structure/control interaction

Pages: 17 - 21 | DOI: 10.15224/978-1-63248-123-8-17

4. THE CONTROL OF BLAST FURNACE TOP GAS PRESSURE BY USING FUZZY PID

Authors: AYTAC ALTAN , OZGUR ASLAN , RIFAT HACIOGLU

Abstract: Blast furnace top gas pressure control is very important for the efficiency of the blast furnace process in iron and steel industry. In automation systems, the blast furnace top gas pressure control is performed by the PID algorithm which sends the reference signal to the proportional valve in the field. The variability of blast furnace process parameters and disturbances of the system decrease the control performance of PID algorithm. The pressure control system has higher overshoots and steady state errors. In this study, the model of the blast furnace top gas pressure control process is obtained by linear Auto-Regressive eXogenous (ARX) model structure. PID controller whose coefficients are determined by a fuzzy logic controller applied to ARX model of blast furna

Keywords: blast furnace, top gas pressure, ARX, Fuzzy PID, iron and steel industry.

Pages: 22 - 26 | DOI: 10.15224/978-1-63248-123-8-18

5. LINEAR CLOSED-LOOP CONTROL USING LUENBERGER OBSERVER APPLIED TO INSULIN ADMINISTRATION FOR TYPE 1 DIABETES

Authors: CARLOS E. CASTAÑEDA , GEMA GARCÍA-SAÉZ , AGUSTIN RODRIIGUEZ-HERRERO , MARIA ELENA HERNANDO

Abstract: In this work the design of a Luenberger observer is proposed to estimate the unmeasurable state space variables from Hovorka’s model. This model is linearized and evaluated in an operation point where Luenberger observer is designed using the Ackermann methodology. The observer is employed to estimate the unmeasurable variables of virtual patients which are generated by Bergman’s model. Once the unmeasurable state variables are obtained by the Luenberger observer using only the input-output information of the Bergman’s model, a control algorithm based on eigenvalues relocation trough Ackermann methodology for linear systems is applied. In this methodology, a constant feedback gain vector is obtained in order to compute the control signal (insulin) to be applied to virtual patient and keep on normoglycemia rank. The carbohydrates ingestion is considered as the main disturbances. In order to assess the proposed methodology, two tests are designed: the first one consists of changing the r

Keywords: Luenberger observer, Bergman model, artificial pancreas, type 1 diabetes

Pages: 27 - 32 | DOI: 10.15224/978-1-63248-123-8-19

6. FARADAY BALANCE WITH HEMISPHERIC POLE PIECES: AN APPROACH FOR IDENTIFICATION ZONE WITH A STABLE VALUE OF INDUCTION POLE GRADIENT

Authors: ALEXANDER SANDULYAK , ANNA SANDULYAK , DARYA SANDULYAK , MARIA POLISMAKOVA , NICOLE PAMME

Abstract: The paper observes matter about identification of zone with a stable value of gradient in Faraday’s balance. This matter is solved by purpose obtained coordinate characteristics of magnetic field induction between pole pieces of such balance. The paper shows that such identification may be quite effective when given characteristic (usually it is non-linear and doesn’t yield to desired linear even local approximation) is curly, i.e. has an inflection. It is possible to make a linear approximation of rather shortly characteristic’s region, i.e. establish a stable values of induction pole gradient. It is also possible to get visualized extremum view of gradient induction characteristic: in the vicinity of its extremum gradient value are relatively stable

Keywords: Faraday balance, magnetic susceptibility, specimen’s positioning area, «curly» field density (induction) characteristic, gradient extremum

Pages: 33 - 36 | DOI: 10.15224/978-1-63248-123-8-35

7. CLASSIFICATION OF THIN FILM AND ULTRA THIN FILM DEPOSITION METODS

Authors: BOEV B , D.ANGELOVA , KARTUNOV S.

Abstract: Classification of thin film deposition methods - deposition of thin films of semiconductor materials plays a major role in many areas, especially research and development.

Keywords: nanocomposite films, nano-layers, PVD metods, CVD metods, deposition.

Pages: 37 - 38 | DOI: 10.15224/978-1-63248-123-8-36

8. FINITE ELEMENT ANALYSIS OF STUFFING-BOX PACKING SUBJECTED TO THERMO-MECHANICAL LOADS

Authors: KAOUTAR BAHOUM , MOHAMMED DIANY , MUSTAPHA MABROUKI

Abstract: The principal rule for the stuffing-box packings is to ensure the stem valve sealing. The behavior of these systems is affected by the operating conditions, which are the gland axial stress, the temperature, and the fluid pressure, as well as the mechanical and geometrical characteristics of the various components. In this paper, a numerical study using finite element method is presented to analyze the stresses and the displacements in a stuffing box system under the gland stress and the temperature field.

Keywords: Stuffing box, temperature, gland stress, finite element method

Pages: 39 - 42 | DOI: 10.15224/978-1-63248-123-8-37

9. BOUNDARY LAYER FLOW OF NANOFLUID PAST AN INCLINED STRETCHING SHEET

Authors: JULIE ANDREWS

Abstract: Nanofluids, in which nano-sized particles (typically less than 100 nanometers) suspended in liquids, have emerged as a potential candidate for the design of heat transfer fluids. The main goal of nanofluids is to achieve the highest possible thermal properties at the smallest possible concentrations by uniform dispersion and stable suspension of nanoparticles in host fluids. This paper also includes diverse applications of nanofluids. Along with the cooling applications, there are tribological and medical applications for nanofluids. Nanofluids could be utilized for a wide variety of applications in day today life. The problem of laminar fluid flow which results from an inclined stretching flat surface in nanofluid has been investigated numerically in this paper. The model used here for the considers the effects of Brownian motion and thermophoresis. A similarity solution is presented which depends on the Prandtl number Pr, Lewis number Le, Brownian number Nb and thermophoresis number

Keywords: Boundary-layer, nanofluid, inclined stretching sheet, similarity solution

Pages: 43 - 47 | DOI: 10.15224/978-1-63248-123-8-38

10. MODEL PREDICTIVE CONTROL OF LOAD TRANSPORTING SYSTEM ON UNMANNED AERIAL VEHICLE (UAV)

Authors: AYTAC ALTAN , OZGUR ASLAN , RIFAT HACIOGLU

Abstract: The control system in Unmanned Aerial Vehicles (UAV), which is widely used in exploration and surveillance, target detection and tracking, remote sensing and mapping, logistics and cargo, search and rescue in dangerous areas, is very important. In this study, the model of the Load Transporting System (LTS) originally designed on UAV is obtained by linear Auto-Regressive eXogenous (ARX) model structure and the Model Predictive Control (MPC) is performed. The 4 payloads in the cubic structure can be carried by the originally designed LTS. DC servo motor is used in the LTS so that payloads can be left to the predetermined targets. When designing the MPC compared to classic PID, the limitations due to the physical properties of the LTS on the UAV are considered. The UAV autonomously flies and leaves payloads using LTS on targets.

Keywords: UAV, Load Transport Sytstem (LTS), Model Predictive Control (MPC), position control.

Pages: 1 - 4 | DOI: 10.15224/978-1-63248-123-8-14