Ocean waves are one of the cleanest and most abundant energy sources on earth, wave has potential for future power generation. Triboelectric nanogenerator (TENG) technology recently been proposed as a promising to harvest energy. In this paper, theoretical study is performed duck-shaped TENG harvester introduced in our work. To enhance design harvester, mechanical electrical characteristics harvester's overall structure, well its inner configuration, analyzed, respectively, under different...

Abstract Vibrations generated during the operations of machine tools, especially at high-speed operation impact several issues in machined parts such as imprecision dimensions and a poor surface finish. This prompts research studies into alternative materials for tool structures to provide considerable damping performance acceptable stiffness compared traditional materials. paper deals with experimental study developed granite-epoxy composite, made from waste granite local epoxy an material...

This article presents a mathematical model for sizing optimization of undamped trusses subjected to dynamic loading leading fatigue. The combined effect static and loading, at steady state, is considered. An model, whose objective the maximization safety factor these trusses, developed. A new quantity (equivalent fatigue strain energy) combining effects stresses presented. used as global measure proximity failure. Therefore, equivalent energy minimized, this seems give good value maximal...

Abstract. Vertical-axis wind turbines are considered a proper solution for today's energy needs. To make it affordable domestic usage, this requires reduction in the turbine cost, blade weight, and an increase life. The challenge VAWT design is fatigue life prediction, besides surviving centrifugal force repeated load pattern effects. paper focuses on structure modelling optimization to assess integrity, fatigue, life, sustainability, cost. presented model can examine varied materials,...

Energy harvesting is an emerging topic recently. This harvested energy used to operate wireless sensors for different industrial monitoring and automation. To maximize the in spinning systems, harvester should vibrate at resonance frequencies which can be achieved by active fitting. In this research, a novel methodology was developed actively customizing length of vibrating element beam manipulate its natural frequency according frequency. Different models were investigated numerically...

Energy harvesting is an emerging topic recently. This harvested energy used tooperate wireless sensors for different industrial monitoring and automation. Tomaximize the in spinning systems, harvester should vibrate atresonance frequencies which can be achieved by active fitting.In this research, a novel methodology was developed actively customizing thelength of vibrating element beam to manipulate its natural frequency according thespinning frequency. Different models were investigated...

Abstract Energy harvesting is an emerging topic in the recent energy global problem. can be harvested from different resources such as sea waves, wind, solar, etc. In this research, spinning objects using vibrations will addressed addition to how conduct active fitting procedures allow vibrating elements at all time work under resonance condition. Any object has a centrifugal force that affects element and cause more stiffness its normal condition, which helps increasing natural frequency...

Due to their complexity, detecting and analysing damage modes in composite honeycomb sandwich panels can be difficult. This article describes the way which a three-point bending test (3PBT) was performed on glass fibre aluminium panel (HSP). Acoustic emission (AE) used identify signals, were then analysed determine positions characteristics of defects. To locate positions, Delta-T mapping used. The load progressively applied three phases, with specimen being inspected visually during each...

In this work, the stochastic dispersion of novel coronavirus disease 2019 (COVID-19) at borders between France and Italy has been considered using a multi-input multi-output model. The physical effects wind, temperature altitude have investigated as these factors relationships are in nature. Stochastic terms also included to take into account turbulence effect, random nature above parameters considered. Then, method is proposed identify developed model's order parameters. actual data used...

Microelectromechanical Systems (MEMS) devices suffer from reliability problems which affect its performance.Fabrication processes initiate residual stresses that cause stress stiffening and curling.It is shown the previous research reducing both curling a challenging issue.Analytical analysis for fixed-fixed beam done to determine factors affecting in rectangular cross-section beams.A new U-shaped plate proposed decrease curling.The compared with reference flat same bending stiffness,...

Abstract Microelectromechanical devices such as accelerometers, gyroscopes, pressure sensors, and radiofrequency (RF) switches are widely used in aerospace applications. Reduction of stiffening curling initiated during fabrication these is one the challenging issues MEMS design. Reducing response time also favorable some applications RF switches. This paper aims at reducing stiffening, curling, increasing natural frequency for three well-known designs micro-plates with fixed-fixed supports....

Titanium alloy (Ti6Al4V), stainless steel, and cobalt chromium (CoCr) are biomaterials used biomedical implants with limited acceptable biocompatibility because their low wear resistance.A ductile metallic low-nickel steel glass coating layer produces resist composite material.In this work, fuzzy logic control system (FLC) using for optimizing resistance amorphous content of Fe-based MG (metallic glass) composite, papered its substrate surface by silicon carbide 240 grit sandpaper, laser...

An RGGR spatial mechanism with constant input speed and arbitrary link • dimensions is considered.The coupler a thin straight rod.The masses of the moving links are distributed so that centre their total mass stationary throughout cycle to insure resultant shaking force transmitted ground due inertia effects on vanishes.This achieved by fixing two balancing weights output links.The weight attached ouput solid cylinder greatest feasible length, axis rotation coinciding one generators its...

The paper proposes the use of a cam with reciprocating or oscillating follower for elimination fluctuation torque input to planer mechanism.The is fixed shaft, which rotating at uniform speed, and • maintained in contact by means spring.The expression torque, required drive planar mechanism constant output leads inertia forces considered, derived.The profile designed such that counters fluctuating part torque.This condition employed deriving design equation, differential equation describing...