Rajasthan Technical University

About: Rajasthan Technical University is a education organization based out in Kota, Rajasthan, India. It is known for research contribution in the topics: Photovoltaic system & PID controller. The organization has 716 authors who have published 1084 publications receiving 4530 citations. The organization is also known as: RTU.

Band configurable multi-band BPF using step impedance resonator structure

Abstract: Now a days multi-band and multi-service applications are increased so need of reconfigurable components is increased. Proposed single design can play role of single-band, dual-band, tri-band or quad-band BPF as the configurations of switching devices are changed. This work is based on switching between different filters (having different numbers of passbands). Designed filters have passband frequencies of mobile communication and aeronautical radio navigation applications and can be changed by changing designing parameters. Designing and simulation of proposed microstrip filter structure is performed on commercial software CST microwave studio. Alumina (Epsilon e r = 9.9) sheet of height 0.5mm is used as substrate material.

Enhancing the Engineering Properties of Black Cotton Soil by Using Magnesium Chloride

Abstract: Black cotton soils are fundamentally helpless to hinder the volumetric changes as the moisture content changes. These soils are forming vital issues to the engineering structures. Such soils show excessive volume changes after combining with water. The black cotton soil has a poor encouraging limit and huge change in volume on varieties of moisture content. Such black cotton soils ought to be improved to make them appropriate for construction exercises. This paper introduces the impact of magnesium chloride (MgCl2) on compaction qualities, Atterberg’s limit, California bearing proportion, standard proctor compaction test, unconfined compressive quality parameters and swelling pressure characteristics. Plastic limit decreases with decrease in the amount of magnesium chloride. The dry density and CBR values of soil stabilized with 8% MgCl2 increased approximately 22 and 223% correspondingly. Coming from the inspection of test outcomes it was discovered that fluid utmost, versatility list, ideal dampness content diminished and most extreme dry thickness, California bearing proportion and edge of inward grating expanded with an expansion in MgCl2.

Experimental Investigation Using Laser Vibrometer and Finite Element Modeling for Modal Analysis of Camshaft

Abstract: Vibration analysis of the internal combustion (IC) engine components is extremely helpful in optimizing the design of these components and has direct bearing on the engine life. This paper presents an experimental and numerical modal analysis of IC engine camshaft. The experimental modal analysis of camshaft excited using impact hammer is performed with the help of a laser vibrometer. The signals from the experiments are obtained in the time domain and are later converted into the frequency domain using fast Fourier transformation (FFT) with the help of MATLAB program. The numerical modal analysis is performed using finite element modeling (FEM) software ANSYS Workbench 14.5. The purpose of this experiment is to validate the finite element model of camshaft using the experimental data, so that the same FEM model of camshaft can be used with confidence for more complex boundary conditions or real operating conditions. To achieve this aim, the natural frequencies and mode shapes of camshaft obtained through experiment and FEM are compared. The methodology presented and the results are useful in optimizing the design of camshaft to be used in IC engine.

A Miniature Tri-Band BPF Using Modified Stepped Impedance Resonator for Wireless Communication

Abstract: A novel miniaturized planar tri-band bandpass filter (BPF) is proposed which consists of a stepped impedance resonator (SIR) with loading stubs, parallel resonating stubs and Broad-defected ground structure (BDGS). Loading stubs are used to provide additional features to vary resonant frequency of filter. SIR with parallel feed structure generates strong cross coupling between input and output which enhances stopband performance. Two parallel resonating stubs provide two addition frequency bands to make filter as Tri-band. Stopband attenuation performance is improved by broad-defected ground structure (BDGS). Proposed Filter can be used for three frequency bands 5.15-5.25 GHz (Wi-Fi/WLAN), 7.75-7.90 GHz (military Line of sight (LOS) communication) and 6.425-6.525 GHz (mobile and satellite communication). All three bands are covered in C band (4-8 GHz). Alumina (Epsilon = 9.9) utilize as substrate with substrate thickness 0.5mm. The proposed filter has miniaturized size (12) x (15) mm2, good tri-band characteristics and also has best performance in desired bands.

A new approach for bearing fault analysis in Squirrel Cage Induction Motor

Abstract: The purpose of energy conversion can be fulfilled by many means but Squirrel Cage Induction Motor is applied to majority of such places. Despite of being robust in nature, it is subjected to various faults categorized as mechanical and electrical faults. A large extant of mechanical faults is due to the bearings which makes identification of malfunctions in nascent condition, a research area of higher importance. Motor Current Signature Analysis emerges as a valuable tool for the purpose. Further, for the purpose of signature extraction, Wavelet Transform also gained importance as a signal processing technique due to its well known property of Multi Resolution Analysis (MRA). It prevails over the major snag of frequency domain technique that is resolution problem. In this paper, stator current signal at no load condition is used for the purpose of fault diagnosis. Wavelet Packet Transform (WPT) is used as signal processing tool and artificially created signals are used to test formula while a set of damaged bearings is used to get the required data of fault conditions for testing the proposed methodology practically. Proposed analysis helps to identify the frequency band along with the axis of operation which can be under focus for the purpose of bearing fault detection. It also consolidate the fact WPT can serve as excellent tool for signal processing when equal band length is required for analysis.