Article Solution of the Generalized Nonlinear Boussinesq Equation Using Homotopy Perturbation and Variational Iteration Methods was published on September 1, 2007 in journal International Journal Sciences Numerical Simulation (volume 8, issue 3).

The free piston engine (FPE), as an alternative of the conventional internal combustion engine, could significantly impact energy consumption and emissions both on-highway off-highway vehicles. In FPE, motion is dependent on chamber gas dynamics loading in real time. One technical barriers that prevents wide spread this technology lack precise control. paper, we present modeling control a hydraulic FPE with opposed-piston opposed-cylinder design. Specifically, comprehensive system model...

Since analytical perturbation methods depend on a small parameter and finding this is difficult, two powerful are introduced to be applied solve nonlinear heat transfer problems in article. One He's variational iteration method ( VIM ) the other homotopy-perturbation HPM ). The used construct correction functionals using general Lagrange multipliers identified optimally via theory. converts difficult problem into simple which can easily solved. In article, some equations with variable...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> Development of a novel low-power linear magnetostrictive actuator is presented in this paper. The material used here Terfenol-D, which an alloy the formula <formula formulatype="inline"><tex Notation="TeX"> $\hbox{Tb}_{0.3}\hbox{Dy}_{0.7}\hbox{Fe}_{1.92}$</tex> </formula>. In response to traveling magnetic field inside Terfenol-D element, it moves opposite direction with peristaltic motion....

In this paper, adaptive-neuro-fuzzy-based sensorless control of a smart-material actuator is presented. The smart material that we used to develop novel type linear Terfenol-D. peristaltic motion in the generated by inducing traveling magnetic field inside Terfenol-D element. based on an observation illustrating direct relationship between active element's position and coils’ inductances. To detect inductance change, coil's current response pulse voltage input monitored. Then, fundamental...

In this study, the variational iteration method (VIM) is used to solve heat-like models with variable coefficients. These initial boundary value problems (IBVP) have significant importance in applied science and many fields of engineering. The exact solutions obtained by VIM are compared those Adomian's decomposition (ADM). results show that although excellent agreement, more convenient easy-to-use than ADM. paper, powerful introduced overcome difficulties arising calculating polynomials.

Nowadays, manufacturing companies are faced with many issues due to the growing demand for high-quality and reasonable price products. As maintenance expenses of industrial machines around 60% 70% production costs [1], an efficient real-time method fault detection is essential reducing cost machine prolonging equipment's life, thereby decreasing expenses. In this article, a novel high-performance precise anomaly framework based on edge computing technology developed enable health monitoring...

Free-piston engine (FPE), as an alternative of the conventional internal combustion engine, has a high potential in terms energy saving given its wide range applications and efficiency. One technical barriers that prevents spread this technology is lack precise piston motion control. This paper presents novel strategy on control hydraulic FPE. A robust repetitive controller designed implemented to form virtual crankshaft would provide stable operation. Based controller, hardware-in-the-loop...

This paper presents a comparative study of two possible power-generating units for the free-piston engine (FPE): Permanent-magnet linear alternator (PMLA) and hydraulic pump. The FPE discussed in this is linear, opposed-piston, opposed-cylinder (OPOC) that operates with homogenous charge compression ignition (HCCI) combustion. Lack crankshaft allows lower friction loss, variable ratio, higher modularity compared to conventional engine. Also OPOC configuration enables high-frequency operation...

Development of an autoencoder-based algorithm for fault detection in rotary machines is presented this paper. As the cornerstone any machine learning model, feature engineering thoroughly studied to select best set features application. Then, autoencoder architecture employed detect anomalous behavior machine. A laboratory setup designed and built provide training test data validate proposed algorithm. It also shown that method well suited online real-time applications.

Design and relay-based control of a novel linear magnetostrictive motor is presented in this paper. The material used here Terfenol-D, an alloy the formula Tb <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.3</inf> Dy xmlns:xlink="http://www.w3.org/1999/xlink">0.7</inf> Fe xmlns:xlink="http://www.w3.org/1999/xlink">1.9</inf> . In response to traveling magnetic field inside Terfenol-D element, it moves opposite direction with peristaltic...

In this paper, the sensorless control of a novel linear magnetostrictive motor is presented. We developed low-power with local three-phase excitation. response to traveling magnetic field inside Terfenol-D active element, it moves in opposite direction peristaltic motion. It observed that there direct relationship between element's position and coils' inductances. To detect inductance change, coil's current pulse voltage input monitored. Then, fundamental current-response pulsewidths...

Centrifugal pumps are the most commonly used type of in industry. Condition monitoring (CM) such machine can significantly reduce repair costs and unexpected break downs. In this paper, electrical signature analysis (ESA) approach is to carry out condition a centrifugal pump driven by single phase induction motor. A multi-fault classification method based on support vector machines developed parameters optimized for fault diagnosis classification. An experimental test rig constructed collect...

Voice coil actuators are extensively employed in precision motion applications with benefits including compact form factor, linear force behavior, and smooth operation. Adopting an optimal approach the design of this actuator can reduce size, manufacturing assembly costs, increase its bandwidth. Besides, having a model that captures nonlinear aspects could play significant role The development high-performance controllers. In paper, optimally-designed voice is developed characterized. Main...

Due to widespread use of motor-driven centrifugal pumps in various industries, deployment cost-effective and reliable means monitoring their performance is crucial importance. There broad spectrum condition (CM) methods ranging from basic periodic inspections fully-automated online systems. Electrical signature analysis (ESA) a promising approach which detects the faults using only electrical signals. This paper studies electromechanical coupling an induction-motor-driven pump. serves as...