Failure Modes and Effects Analysis of Magneto-Rheological Brake PDFBhau K. Kumbhar, Pranit M. Patil, Satyajit R. Patil, Suresh M. SawantIn this work, an effort has been made to study the reliability analysis of the system using the Failure Modes and Effects Analysis (FMEA) technique. FMEA is a development tool used to identify failures and effects on system, products or services. In addition to identifying failure modes and failure mode effects, FMEA provides for quantification and categorisation of failure information in order to allocate and prioritize the risk. The greatest impact of FMEA is in pre-production phases of new product or system development in order to provide failure free systems and products during implementation. FMEA is a versatile tool that has many expressions and that can be integrated with the statistical and software tools to provide for a comprehensive view of risk. Thus, the various possible causes of failure and their effects of a magneto-rheological (MR) brake along with the ways of prevention are discussed in this work.
Effect of Intermittent Power Supply on the German Power System PDFIbrahim A. NassarIn Germany due to the continuous high expansion of the intermittent power supply capabilities of wind turbines and photovoltaic systems, the operational modes of thermal generation units will be influenced essentially until 2020 and beyond. The integration of this increasing share of intermitting generation while maintaining the present security level of supply confronts the existing power system with a big challenge. The fundamental problems are that the intermitting generation does not necessarily fit the power demand and is often located far away from the load centers. This results in physical limitations for integration of intermitting generation with regard to the existing infrastructure. Therefore it is has to be lined out that the acceleration time constant is reduced if some conventional power plant generators with masses are disconnected and replaced by the intermittent generators while the total nominal power value of the whole system remains constant. On the other hand more immediate acting acceleration power produced by the turbine-generator-systems of the conventional power plants will disappear because of shut down of these plants and related loss of inertia. With the reduction of inertia not only the frequency deviation after disturbances will increase substantially but also with more oscillation occurs and causes reduction of system stability. Therefore, different methods and tools to simulate the power plant scheduling will be presented and illustrated under different scenarios of Renewable Energy Sources (RES) to check whether the system is stable or unstable.
Efficiency and Satisfaction Quality of the Health Care Delivery System PDFMuhammad AlEnzy, Jason Harris, Rebecca ManteconThe focus of our project revolved around staffing efficiency and prediction. Multiple case studies were reviewed, allowing us to develop a deeper understanding of how various industrial and systems engineering tools can be utilized to improve healthcare efficiency. The case studies used gradually build upon each other, showcasing how more sophisticated tools can allow a hospital to build to a point where the staffing needs can be modeled and predicted.
Evaluation of Static Frequency Reuse Techniques in OFDM Cellular Networks Using SINR PDFJayasankar.SThe use of orthogonal frequency division multiple access (OFDMA) in Long Term Evolution (LTE) and WiMax cellular systems mitigates downlink intra-cell interference by the use of sub-carriers that are orthogonal to each other. InterÂ cell interference, however, limits the downlink performance of cellular systems. In order to mitigate inter-cell interference, various techniques have been proposed. This paper examines one group of these techniques, static frequency reuse. We present a comprehensive comparison of Reuse-I, Reuse-3, fractional frequency reuse (FFR), and soft frequency reuse (SFR), with varying input parameters, such as inner radius and power ratios. System simulation is used to evaluate the overall system performance in terms of throughput and SINR are evaluated. In addition to the overall system performance, cell-edge user performance, whose performance is severely limited by interference from neighboring cells, for each technique is also evaluated.
Consideration of indicators maintainability design PDFAlami Ayoub, Naciri oumaima, Herrou Brahim, El Hammoumi MohammedNowadays, new products on the market are increasingly complex. This complexity stems partly from the fact that the functions that the systems need to require the integration of multiple components using different technologies. The designer must incorporate into its process all phases of the life cycle of the system and its components. Must opt for solutions that are simple to produce, inexpensive, very reliable, safe, easy to maintain and with a total cost over the entire life cycle that is attractive to the consumer. So to validate a feature or product performance, you must have indicators.
Developing Intelligent MPPT for PV Systems Based on ANN and P&O Algorithms PDFH. I. Abdelkader, A. Y. Hatata, M. S. HasanThe maximum power point tracking (MPPT) in photovoltaic (PV) systems varies depending on the fluctuation of the solar radiation and temperature; while the energy transfer from the PV to the load is controlled by specific algorithms. Conventional techniques for MPPT (Perturb and observe (P&O)) are easy to implement but they suffer from oscillations at MPP and speed is less due to fixed perturb step. To achieve better energy efficiency conversion in PV systems, it is required to develop maximum power point tracking (MPPT) control techniques. This paper presents an improved MPPT controller for PV systems using two techniques namely; Artificial Neural Network (ANN) and developed P&O techniques. The proposed ANN and the developed P&O algorithm are modeled using MATLAB/SIMULINK. The proposed ANN has two inputs which are solar radiation and ambient temperature. The optimum voltage of the PV system is the output of the proposed ANN. The proposed ANN was evaluated under different irradiation conditions and temperature. The response of the proposed ANN for MPPT controllers found to be lesser oscillation at MPP and faster tracking response compared with the developed P&O algorithm.
Why Unmanned Aircraft Systems Failed for a Century PDFMustafa ILLEEZUnmanned Aircraft Systems (UAS) will be the dominating force multiplier of the future air power. When the background of the technology and concept is researched, it can be seen historical systems complying with modern description of UAS started almost at same years with manned aircraft. UAS used in different operational functions such as intelligence reconnaissance surveillance (ISR), air to ground attack, electronic warfare, suppression of enemy air defense (SEAD) etc. in history and never followed an uninterrupted development line. UAS world today seems to be reinventing these concepts. This paper is trying to analyze the reasons of failures of many projects of the history. Determining the factors preventing the success of historical UAS, may provide a different point of view to planners, decision makers, UAS industry and scholars for current UAS development and procurement phases.
Performance Analysis for OFDM System Using Fourier Transform and Wavelet Transform with Different Modulation Techniques PDFQusay jalil, S Nagakishore BhavanamIn OFDM multiple carriers are used and it provides higher level of spectral efficiency as compared to Frequency Division Multiplexing (FDM). In OFDM because of loss of orthogonality between the subcarriers there is inter carrier interference (ICI) and inter symbol interference (ISI) and to overcome this problem use of cyclic prefixing (CP) is required, which uses 20% of available bandwidth. Comparison between the conventional FFT based OFDM systems with DWT based OFDM system have been made according to some conventional and non-conventional modulation methods over AWGN. The wavelet families have been used and compared with FFT based OFDM system and found that DWT based OFDM system is better than FFT based OFDM system with regards to the bit error rate (BER) performance.
Enhancement of Traffic Capacity at High Data using MIMO Technology PDFSwati Kumari, Dr. Rabindranath BeraMIMO technology plays a vital role in wireless communication which uses multiple antennas at both transmitter and receiver side. As the demand of data rate is increasing day by day, there is a need of high throughput, wide coverage, capacity and improved reliability. Integration of OFDM with MIMO holds the potential to drastically increase the data rate in future wireless communication system without increasing the transmit power and bandwidth. In this paper we mainly focus on the advantage of using MIMO-OFDM system and the drawback of using SISO, SIMO, MISO systems which have been verified using simulation. Performance of the systems is measured with respect to BER, capacity and finally the data rate is determined. The simulation results are obtained using MATLAB/SIMULINK software.
A Survey on Face Recognition of Identical Twins PDFKanchan Patil, Prof. Sachin BojewarRecent studies have shown that face recognition performance degrades considerably for images of identical twins. Human face matching capability is often taken into consideration as a bench-mark for assessing and improving automatic face recognition algorithms. Here, this paper will show human capability to distinguish between identical twins. If humans are able to distinguish between facial images of identical twins, it would suggest that humans are capable of identifying discriminating facial traits that can potentially be useful to develop algorithms for this very challenging problem. If humans viewing a pair of facial images can perceive if the image pairs belong to the same person or to a pair of identical twins. The paper consists of experiments results, which are conducted on 186 twin subjects, making it the largest such study in the literature to date. And observation will show that humans can perform the task significantly better if they are given enough time and tend to make more mistakes when images differ in imaging conditions. The paper analysis also suggests that humans look for facial marks like moles, scars, etc. to make their decision and do worse when presented with images lacking such marks. Experiments with automatic face recognition systems show that human observers outperform automatic matchers for this task 2b1af7f3a8