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108 articles for “oscillation”
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Effects of Sub-Zero Temperatures on the Viscoelastic Properties of Magnetorheological Elastomer
Abstract: Magnetorheological elastomers (MREs) are smart materials capable of tuneable stiffness and damping under applied magnetic fields. This renders the material as a promising candidate for adaptive vibration control and semi-active engineering applications. While their behaviour at elevated temperatures has been widely explored, limited attention has been given to their performance under sub-zero conditions, which are critical for cold-environment applications. As this has become an important concern, the study investigates the …
Published in Journal of Polymer & Composites · Vol. 14, Issue 4, 2026 · pp. 326–340 Read article
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Simulation of Pole Placement Controller for an Active Bus Suspension System
Abstract: Designing a suspension system for a bus is an interesting and challenging control problem. When the suspension system is designed, a one quarter bus model (one of the four wheels) is used to reduce the complexity of the problem. The active suspension system is the one which has a force actuator in parallel to passive suspension. The open loop time response of the suspension system is damped oscillatory and has …
Published in Journal of Automobile Engineering and Applications · Vol. 2, Issue 2, 2015 · pp. 13–18 Read article
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Design and Construction of a Thermosiphonic Solar Photovoltaic – Thermal Water Heating System for Sustainable Development in Temperate Regions of Africa
Abstract: AbstractThe atmospheric temperature of some temperate regions of Africa is mostly about 30–45°C, it incites 30–80°C heat over the panel since black body of the PV panel observes more heat, and this temperature affects the electrical efficiency of the panel. The importance of energy availability in the economic growth, social and political development for every nation cannot be overemphasized. Affordable and reliable energy availability is the precondition for sustainable development. …
Published in Journal of Alternate Energy Sources & Technologies · Vol. 8, Issue 3, 2017 · pp. 1–8 Read article
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State Space Modeling and Robust Wind Power Generation System
Abstract: AbstractAs producing power from renewable energy is increasing, facing new problems emerging from this phenomenon is becoming a good challenge for power system engineers. One of these problems is the dynamic and transient stability of such systems when they are connected to a power network. In this paper, a variable speed cage machine wind generation system is considered as the case study. The concept of power system stabilizer, which has …
Published in Journal of Alternate Energy Sources & Technologies · Vol. 8, Issue 2, 2017 · pp. 24–39 Read article
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Multilevel Inverter Based PV System with MPPT Application
Abstract: Abstract: An improved MPPT converter with voltage and current (perturb & observe) method for photo voltaic (PV) and 5-level H-bridge multilevel inverter is connected to solar panel, applications is presented in this study. The proposed method used to implement maximum power point tracking (MPPT) and convert DC power into AC power by variable reference of voltage and current which is continuously changed during some time (up to 5 sec). In …
Published in Journal of Alternate Energy Sources & Technologies · Vol. 10, Issue 1, 2019 · pp. 42–52 Read article
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Maximum Power Point Tracking Using PSO with Boost Converter
Abstract: Maximum power point tracking methods are used for extraction of maximum power from solar PV panels. The characteristics of non-line panel hinder the power output from the solar panel. Earlier proposed methods like hill climbing, incremental conductance suffer from steady state and lower efficiency. This proposed evolutionary computation technique assures nearly zero steady state oscillation and faster convergence of tracking maximum power. The PSO algorithm is tested on a DC-DC …
Published in Journal of Alternate Energy Sources & Technologies · Vol. 7, Issue 2, 2016 · pp. 17–27 Read article
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The Rheological Effect of SiO2 Nanoparticles Additives for NBR/CR Blends
Abstract: The rheological alteration of NBR/CR after adding various nano-quantities of silicon oxide (0–50) wt.% was studied. The rheological properties that were tested are viscosity, scorch time, cure time and max torque. Oscillating disk rheometer was used for measuring the above properties. The experimental results have shown that the silicon oxide additives have a good effect on viscosity and max torque during vulcanization, but at the same time the scorch and …
Published in Journal of Catalyst & Catalysis · Vol. 4, Issue 3, 2017 · pp. 1–4 Read article
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Model Based PID Controller for SISO and MIMO System Control
Abstract: In this paper, model based PID controller design method is presented for single variable and multivariable processes with enhanced performance. Adequate responses can be anticipated for processes with various dynamics like high-order, large dead times, and oscillatory response. The design method is used first order plus dead time (FOPDT) modelling technique. For controller design higher order process models are approximated in the form of FOPDT and obtained controller is applied …
Published in Journal of Control & Instrumentation · Vol. 10, Issue 3, 2019 · pp. 9–16 Read article
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Micro-Doppler Signatures for Human with Orbbec Sensor
Abstract: Micro-movements, such as oscillations, rotations or revolution of an object or structures persuade additional frequency modulations on reinstate radar signal, which generates sidebands about the object’s Doppler frequency, called micro-Doppler effect. Human body mechanics consist of various moving body parts, which generate unique micro-Doppler signatures. Using TFT (time frequency transforms and pattern recognition techniques; we can classify individuals based on their movements using micro-Doppler signatures. Preliminary results from a laboratory …
Published in Journal of Electronic Design Technology · Vol. 12, Issue 1, 2021 · pp. 1–9 Read article
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True Random Number Generators Using A Postprocessor, Jitter Metastability, Tree-based Interleaver & Low-power CMOS inverter Circuit prototype technology: An Efficient Analysis
Abstract: TRNGs (True Random Number Generators) are cryptographic primitives that generate random numbers for critical operations. The goal of this study is to create a TRNG using a ring oscillator, analyse different calibration generating ways using VHDL spice simulation, and investigate the TRNG's essential design features, such as area, entropy, and power/energy consumption, using suggested and published methods. Random ones and zeros are produced using RO jitter and DCM frequency fluctuations. …
Published in Journal of Microcontroller Engineering and Applications · Vol. 10, Issue 1, 2023 · pp. 66–76 Read article
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Experimental Setup to Determine Stress Wave Propagation in a Compound Bar
Abstract: Deformation undergone by a body due to impact results in development of dynamic stresses. This deformation depends on the material properties and geometry. Advancements made in stress wave propagation are focused at the necessity to understand dynamic history of structures subjected to applied loads. Stress travels with different velocities in different bodies depending upon material characteristics, crystal structure etc. Forces applied on bodies at short intervals of time result in …
Published in Journal of Materials & Metallurgical Engineering · Vol. 8, Issue 2, 2018 · pp. 1–6 Read article
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Study of Dual Modulus Prescaler for Frequency Synthesizer
Abstract: In recent mobile communication systems high frequency synthesizers are the main building block. Voltage controlled oscillator (VCO) and prescalers are the high frequency parts of a frequency synthesizer. The prescaler reduce high frequencies into low frequencies by a small integer division. For prescaler power consumption, speed and no. of division ratios are the major concerns. The dual modulus prescalers are the frequency dividers which can selectively divide the frequency with …
Published in Journal of Microelectronics and Solid State Devices · Vol. 3, Issue 2, 2016 · pp. 16–22 Read article
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3D PRINTER USING ARDUINO
Abstract: The most innovative technology in the current world of science is 3D printer. 3D printing or additive manufacturing (AM) is a technology that converts 3D designs into real objects by use of liquid plastic which is controlled by programming the Arduino Mega 2560 and using CAD software like Slic3r, Pronterface. Arduino is an open-source physical computing platform. The Arduino Mega microcontroller board is based on the ATmega2560. It consists of …
Published in Journal of Semiconductor Devices and Circuits · Vol. 7, Issue 3, 2020 · pp. 1–4 Read article
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Study Effect of Position of Fixed Magnet on Performance of VEH Device Working on Electromagnetic Principal
Abstract: Vibration energy harvesting (VEH) is one of key source of power for remote locations. VEH device gives maximum output at its natural frequency matching with excitation frequency. So, it is suitable for standalone frequency, gives rise to increase band widening efforts. To achieve resonance, stiffness or moving mass is to be changed. Changing of mass during operation is difficult to achieve. Repulsive and attractive force between magnets can be varied …
Published in Journal of Telecommunication, Switching Systems and Networks · Vol. 4, Issue 1, 2017 · pp. 6–11 Read article
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Designing of GaAs Based Resonant Tunneling Diode and Nano Scale Applications with Considering NEGF
Abstract: Present situation of eletronic area in the world required small devices as well as low power dissipation and ultra high speed application. At this moment the presence of resonant tunneling diode can over come this type of problem and take a big role in nanoscale digital and analog applications.In this researh article is to demonestrated effect of asymmetric barrier with respect to symmetric barrier and digital inverter and THz analog …
Published in Journal of VLSI Design Tools and Technology · Vol. 5, Issue 1, 2015 · pp. 1–18 Read article
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Analysis of Six-Pulse Bridge Circuits Including Zener and Semiconductor Diodes Part One
Abstract: This paper addresses the analysis of electronic bridge circuits including Zener and/or semiconductor diodes. The analysis is based on recently suggested models for these diodes. A compact Mathematica code written in the Versions 7.0, 11.3 and 12.2 simulating a six-pulse rectifier bridge circuit is then derived and mathematically implemented. It investigates the time-domain transient and steady-state analysis of several representative case studies. In principle, the computer simulation can yield the …
Published in Journal of VLSI Design Tools and Technology · Vol. 12, Issue 1, 2022 · pp. 14–22 Read article
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Delta Sigma Fractional N Frequency Synthesis
Abstract: Frequency synthesizers are fast becoming essential for several broadcast bands and circuits as communication technology hasimproved. To meet this need, the fractional N frequency synthesizer was created. This synthesizer has proven its supremacy as a noteworthyinnovation by permitting various improvements over comparable concepts. Only when it is combined with delta-sigma modulation is thispossible. This combi- national circuit enhances frequency resolution and noise performance. PLL-based frequency synthesis is often used toproduce …
Published in Journal of VLSI Design Tools and Technology · Vol. 13, Issue 2, 2023 · pp. 12–20 Read article
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Groundwater Darcy Velocity from underground Temperature: A Focus on the City of Turin (NW Italy)
Abstract: We report on an application of a methodology for inferring water transfer in a shallow aquifer by using analytical models of interpretation of heat transport by advection and conduction in permeable horizons. In this research, we highlight as the statistical interpretation of thermal data is a tool to obtain a quantitative estimation of the horizontal component of the Darcy velocity in a shallow aquifer. This study is based on the …
Published in Journal of Water Resource Engineering and Management · Vol. 8, Issue 3, 2021 · pp. 19–29 Read article
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ANALYSIS OF G+15 NORMAL RCC FRAME AND ZIPPER BRACED FRAME BY PUSH OVER METHOD IN SAP2000
Abstract: This paper describes the comparative analysed results of R.C.C zipper braced frame with standard RCC regular frame for residential building of G+15 storey. The modelling of zipper braced frame were done by using pushover analysis method in SAP2000 software. Pushover analysis were performed for estimating the hinges in both frames, displacement, base shear and modal time period. The analysis indicates that there is almost insignificant hinges in zipper braced frame …
Published in Recent Trends in Civil Engineering & Technology · Vol. 8, Issue 3, 2018 · pp. 21–34 Read article
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Effect MFD Viscosity on Bénard–Marangoni Ferroconvection in a Rotating Ferrofluid Layer with Convective Surface Boundary Condition
Abstract: AbstractThe combined effect of Coriolis force due to rotation and magnetic field dependent (MFD) viscosity on the onset of Bénard–Marangoni convection in a horizontal layer of ferrofluid is investigated theoretically. The lower boundary is taken to be rigid–isothermal, while the upper free boundary open to the atmosphere is flat and subject to a convective surface boundary condition. The Galerkin technique is employed to extract the critical stability parameters numerically. It …
Published in Recent Trends in Fluid Mechanics · Vol. 7, Issue 2, 2020 · pp. 12–32 Read article