Dalgıç Motorun Analitik, Sayısal, Performans Sonuçlarının Karşılaştırılması

Asenkron motorlar endüstride en fazla kullanılan motorlardır. Bu motorların geometrik ve tasarımsal bazı özellikleri değiştirilerek kullanım alanları çeşitlilik göstermiştir. Bu uygulama alanlarından biri de tarımsal sulama uygulamalarıdır. Dalgıç motor olarak kullanılan asenkron motorların; küçük çap, paket boyu uzunluğu ve çalışma ortamların farklılık göstermesi temel tasarım parametrelerini (akım yoğunluğu, sıcaklık, vb.) değiştirmektedir. Bu çalışmada; ANSYS-Maxwell paket programı kullanılarak 75KW (100Hp) dalgıç asenkron motorun analitik (RMxprt), sonlu elemanlar çözümü Maxwell 2D kullanılarak gerçekleştirilmiştir. RMxprt ve Maxwell 2D’de elde edilen çözüm sonuçları deneysel veriler ile karşılaştırılmıştır

The Association between Plasma D-dimer Levels and Community-Acquired Pneumonia

BACKGROUND: Plasma D-dimer levels are directly related to the intra- and extra-vascular coagulation that occurs in acute and chronic lung damage in patients with community-acquired pneumonia (CAP). OBJECTIVES: This study examines the relationship between the severity of community-acquired pneumonia and D-dimer levels. In addition, the study examines the correlations among community-acquired pneumonia, the radiological extent of the disease and mortality. METHODS: The Pneumonia Severity Index was used to classify patients into five groups. Patients were treated at home or in the hospital according to the guidelines for community-acquired pneumonia. Blood samples were taken from the antecubital vein with an injector and placed into citrated tubes. After they were centrifuged, the samples were evaluated with the quantitative latex method. RESULTS: The study included 60 patients who had been diagnosed with community-acquired pneumonia (mean age 62.5 ± 11.7) and 24 healthy controls (mean age 59.63 ± 6.63). The average plasma D-dimer levels were 337.3 ± 195.1ng/mL in the outpatient treatment group, 691.0 ± 180.5 in the inpatient treatment group, 1363.2 ± 331.5 ng/mLin the intensive care treatment group and 161.3 ± 38.1ng/mL in the control group (p<0.001). The mean D-dimer plasma level was 776.1 ± 473.5ng/mL in patients with an accompanying disease and 494.2 ± 280.1 ng/mL in patients without an accompanying disease (p<0.05). CONCLUSIONS: Plasma D-dimer levels were increased even in community-acquired pneumonia patients who did not have an accompanying disease that would normally cause such an increase

A medium frequency transformer design for spot welding machine using sizing equation and finite element analysis

In this study, a medium frequency power transformer has been designed analytically and its sizes have been obtained. The transformer’s analyses were made numerically by 2D AnsysMaxwell Solver software package. The Solver has also helped to study suitable transformer core and winding samples. Unlike medium frequency transformer, which is generally driven by unipolar PWM method, the designed transformer is driven by bipolar PWM method in the study. The core losses were obtained for different core materials (Trafoperm N3 and Amorfous 2605SA1) by AnsysMaxwell numerical and analytical calculations. The calculated losses for no-load working conditions were compared with each other. The designed transformer has been analyzed for its noload and loaded working conditions magnetically. Finally, the radial and axial forces created in the windings have also been examined for loaded working condition

Catalyzing Transcriptomics Research in Cardiovascular Disease : The CardioRNA COST Action CA17129

Cardiovascular disease (CVD) remains the leading cause of death worldwide and, despite continuous advances, better diagnostic and prognostic tools, as well as therapy, are needed. The human transcriptome, which is the set of all RNA produced in a cell, is much more complex than previously thought and the lack of dialogue between researchers and industrials and consensus on guidelines to generate data make it harder to compare and reproduce results. This European Cooperation in Science and Technology (COST) Action aims to accelerate the understanding of transcriptomics in CVD and further the translation of experimental data into usable applications to improve personalized medicine in this field by creating an interdisciplinary network. It aims to provide opportunities for collaboration between stakeholders from complementary backgrounds, allowing the functions of different RNAs and their interactions to be more rapidly deciphered in the cardiovascular context for translation into the clinic, thus fostering personalized medicine and meeting a current public health challenge. Thus, this Action will advance studies on cardiovascular transcriptomics, generate innovative projects, and consolidate the leadership of European research groups in the field.COST (European Cooperation in Science and Technology) is a funding organization for research and innovation networks (www.cost.eu)

Desıgn And Applıcatıon Of Tubular Type Lınear Generator

Serbest piston mekanizmalarında doğrusal jeneratörler; ek mekanik bileşenlere (krank-biyel) gerek olmaksızın pistonun doğrusal kuvveti kullanılarak elektrik enerjisi üretebilme yeteneğine sahiptir. Bu uygulama alanlarında uygun güç değerlikleri için jeneratör tasarımının gerçekleştirilmesi önemlidir. Tez çalışmasında doğrusal jeneratör ile elektrik üretim prensipleri, doğrusal jeneratör çeşitleri ve topolojileri avantaj-dezavantajları bakımından incelenmiş ve kullanılan farklı sistemler hakkında genel bilgiler verilmiştir. Bu çalışma serbest piston uygulamalarında kullanılmak üzere tüp biçimli doğrusal jeneratör tasarımı, optimizasyonu ve prototip üretimini içermektedir. Tüp biçimli doğrusal jeneratör tasarımı boyutlandırma eşitlikleri verilmiştir. En uygun bağımsız tasarım değişkenlerinin belirlenmesi amacıyla Ansys-Tasarım araştırıcısı yardımıyla kolerasyon analizi yapılmıştır. Jeneratörün optimum tasarımı için verim hacim, ağırlık, maliyet, genel performans için amaç fonsiyonları tanımlanmıştır. Jeneratör temel boyutlarını analitik olarak hesaplayan Matlab Gui tabanlı arayüz geliştilmiştir. Bu arayüz Ansys/Maxwell ile haberleşebilmektedir ve dinamik yapıdadır. Analitik sonuçlar nümerik çözümleme için Ansys/Maxwell çözüm modüllerine temel tanımlama ve model çizimine ihtiyaç duymadan otomatik aktarılarak çözümler gerçekleştirebilmektedir. Matlab Gui'de geliştirilen algoritma ile belirlenen bağımsız değişkenler ve amaç fonksiyonları doğrultusunda jeneratörün en iyi geometrik boyutlarını hesaplayabilen bir program geliştirilmiştir. Farklı güç ve frekans değerleri için analitik boyutlandıma ve optimizasyon sonuçları verilmiştir. Geliştirilen program ile 3 fazlı 50 Hz, 6/4 oluk kutup oranlı, 600 VA gücünde jeneratör tasarımı analitik hesaplama sonuçları ile benzetim sonuçları kıyaslanmıştır. Ayrıca analitik ve nümerik optimizasyon sonuçları da karşılaştırılmıştır. Jeneratör boyutlandırılmasına dair elde edilen değerler ile jeneratör imalat çizimleri hazırlanmıştır. Tüp biçimli doğrusal jeneratörün prototip imalatı ve deneysel çalışmalar gerçekleştirilmiştir. İndüklenen gerilim teorik ve deneysel olarak karşılaştırılmıştır. Doğrusal hareketli sistem yaklaşık 550 d/d 10Hz ve 1100 d/d 20Hz çalışma durumlarında farklı elektriksel yükler için yük akımı ve yük gerilimi değerleri elde edilmiştir.Linear generators at free piston mechanisms have the ability to generate electrical energy using linear force of the piston without the need for additional mechanical components (crank-link). It is important to design the generator for appropriate power ratings in these application areas. In the thesis study, power generation principles with linear generators, linear generator types and topologies are examined in terms of advantages and disadvantages and general information is given about the different systems used. This study includes tubular linear generator design, optimization and prototype production for use in free piston applications. The design of tubular type generator sizing equations are given in the thesis. AnsysDesign Explorer and correlation analysis were used to determine for the most appropriate independent design variables. Target functions for efficiency, volume, weight, cost, overall performance are defined for the optimum design of the generator. A Matlab Gui based interface has been developed that analytically calculates the generator base dimensions. This interface is able to communicate with Ansys / Maxwell and is dynamic. The analytical results can be automatically transferred to Ansys / Maxwell solution modules for numerical analysis without the need for basic identification and model drawing. Matlab Guide has developed a program that can calculate the best geometric dimensions of the generator in accordance with the arguments and objective functions determined by the algorithm developed. Analytical sizing and optimization results for different power and frequency values are given. With the program developed 3-phase 50 Hz, rated 6/4 oluk pole, 600 VA power generator design simulation results were compared with analytical calculation results. Besides, analytical and numerical optimization results are compared. Generator manufacturing drawings with the values obtained on the generator dimensioning were prepared. Tubular type linear generator prototypes and experimental studies have been performed. Induced voltage is compared theoretically and experimentally. Load current and load voltage values for different electrical loads were obtained at 10 Hz and 20 Hz operating states

Dalgıç Motorun Analitik, Sayısal, Performans Sonuçlarının Karşılaştırılması

Asenkron motorlar endüstride en fazla kullanılan motorlardır. Bu motorların geometrik ve tasarımsal bazı özellikleri değiştirilerek kullanım alanları çeşitlilik göstermiştir. Bu uygulama alanlarından biri de tarımsal sulama uygulamalarıdır. Dalgıç motor olarak kullanılan asenkron motorların; küçük çap, paket boyu uzunluğu ve çalışma ortamların farklılık göstermesi temel tasarım parametrelerini (akım yoğunluğu, sıcaklık, vb.) değiştirmektedir.Bu çalışmada; ANSYS-Maxwell paket programı kullanılarak 75KW (100Hp) dalgıç asenkron motorun analitik (RMxprt), sonlu elemanlar çözümü Maxwell 2D kullanılarak gerçekleştirilmiştir. RMxprt ve Maxwell 2D’de elde edilen çözüm sonuçları deneysel veriler ile karşılaştırılmıştır

The Study of Dust Removal Using Electrostatic Cleaning System for Solar Panels

This study explores the use of electrostatic cleaning to remove dust from the surface of photovoltaic solar panels. First of all, existing systems used for dust removal from solar panels were evaluated. Then, the effects of dust on the panel were investigated for Şanlıurfa province in Turkey. In addition, the elemental content of the powder was analyzed. A new device for electrostatic cleaning has been designed and implemented. The cleaning performance of this device has been tested considering the electrode designs. The electric field value was determined by analytical and numerical methods in the conventional model (parallel electrode) model. Electric field distribution was investigated using Ansys Maxwell simulation software. The printed circuit boards of the proposed model and the conventional model were produced. The traditional model with positive and negative waveform is widely used in electrostatic cleaner studies. Dust removal efficiencies and electrical losses for different frequency and voltage values were compared for both cards. It has been shown that the proposed model can perform cleaning with high efficiency despite similar loss variation

Reduction of Dust on Solar Panels through Unipolar Electrostatic Traveling Wave

In this study, a novel electrostatic cleaning scheme has been applied to a new designed and developed electrode having high cleaning efficiency. In this method, a high voltage, four-channel, 1 Hz square wave signal is applied to a specially designed electrode array. Models of the electric field distribution of the proposed electrode array were developed and analyzed using Ansys Maxwell simulation software and printed circuits boards (PCBs) were produced. The performance of dust removal using the electrodes was evaluated. A 1 MW solar power plant was taken as a case study, and performance and cost were compared with the classical panel cleaning method (wet cleaning system). Our study has shown that the electrostatic cleaning method can be carried out with lower cost and higher efficiency than existing methods

Linear generator design for concentrating solar power technologies: Optimization and prototype development

Abstract An alternative way to generate electricity from solar energy is through the use of generators comprising Stirling engines with a parabolic collector. This study describes a parabolic collector with Stirling engine and investigates the design of a linear mobile generator for these systems. Especially for direct drive in free piston mechanisms proposed for these systems, linear generators are important due to their advantages such as compact structure, light weight, high efficiency and high power intensity. Although conventional one‐phase and three‐phase multi slot/pole models are widely available in the literature, three phase is considered for lower PM cost and to reduce the cost of power electronics and 3/2 slot/pole combination is considered for high speed and frequency. In this study, a new 3/2 slot/pole three‐phase tube‐type linear generator was designed and evaluated for performance and manufacturability. Objective functions were defined for power and efficiency increase to reduce generator power ripple, and the results of Mixed‐Integer Sequential Quadratic Programming, Multi‐Objective Genetic Algorithm (MOGA), and Screening methods were compared and examined. Performance of the two‐dimensional and optimized models was evaluated in terms of induced voltage, power density, efficiency, and output power. The best results were found with MOGA compared to other methods. When compared with the initial value, there was a 97.3% increase in power density for a 32.4% increase in moving weight. Moreover, the efficiency of the MOGA model is improved by 16.2% compared with the initial model. Additionally, significant improvements were shown in terms of thrust coefficient, voltage coefficient, power, and no‐load voltage. A prototype of the model was made and a motor‐driven crank mechanism system was used in place of the Stirling engine to undertake practical measurements