The need to devise a low-speed balancing method for high-speed rotors was recognized and addressed. In this paper, scheme that combines both the influence coefficients modal techniques is presented. developed of rotors, relies on knowledge characteristics rotor. conditions applicability were stated in light experientially estimated rotor deflection mode shapes. An experimental test rig flexible constructed verify reliability scheme.

Wall-thinning due to chemical reactions, heat, erosion, or a combination of such influences is the most dominant type internal surface damage in piping systems. In order examine effect wall-thinning on natural frequencies, elastodynamic model fiber-reinforced polymer pipe formulated using wavelet-based finite element method. this context, new set Hermite shape functions developed. The generalized eigen value problem solved and frequencies are obtained for an with different depths locations...

Pipes conveying fluids are primary components in almost all industries. Internal surface attack is inevitable pipes and can be crucial to their structural integrity dynamic response characteristics. In this study, the analysis of composite with internal discontinuity investigated presence fluid flow. The equations motion obtained using extended Hamilton’s principle discretized wavelet-based finite-element method (WBFEM). defect allowed occupy any length along pipe span, while its cross...

An unbalance in a rotating flexible rotor causes excessive vibration and elastic deformations with subsequent malfunction failure. In spite of different techniques deployed to reduce or eliminate unbalance, it is impossible remove the completely. The will only be reduced residual level. Hence, any other method that can this level further considered as an alternative. article, Differential Evolution (DE) Genetic Algorithm (GA) were successfully applied optimization balance rotors. unbalancing...

Spinel ferrites are magnetic oxide materials with potentials to promote green technology in refrigeration which is known be economically clean, energy saving and efficient. Maximum entropy change of spinel decides controls the applicability as well strength ferrite since it measures hugeness magnetocaloric effect. However, experimental determination maximum requires intensive procedures, costly equipment consumes appreciable time. Intelligent models presented this work using...

The vibration analysis of composite pipes with internal wall defects due to erosion-induced surface degradation is investigated. are treated as discontinuities. geometry the discontinuity permitted vary within cross-section both in angular and radial directions, occupy any length pipe span. A B-spline wavelet-based finite element method (BWFEM) that takes advantage localization properties wavelets invoked; thus utilizing its effectiveness modeling crack problems local damages. was beam...

Structures dynamic characteristics and their responses can change due to variations in system parameters. With modal of the structures, be identified. Mode shape remains vital analysis structures. It utilized failure analysis, interaction between structures supports circumvent abrupt failure. Conversely, unlike empty pipes, mode shapes for pipes conveying fluid are tough obtain intricacy eigenvectors. Unfortunately, found practice various engineering applications. Thus, global functions,...

Tin (II) sulfide (SnS) is a metal chalcogenide semiconducting material with fascinating and admirable physical features for practical applications in solid‐state batteries, photodetectors, gas sensors, optoelectronic devices, emission transistors, photocatalysis among others. The energy gap of SnS semiconductor nanomaterial that facilitates its usefulness many can be adjusted through dopant incorporation which results crystal lattice distortion at various crystallite sizes the semiconductor....

The energy sector is considered one of the most sensitive sectors to climate change. Climate change has a considerable impact on environmental weather parameters such as temperature, humidity, radiation from sun, precipitation, sunshine hours, wind direction, etc. These meteorological considerations have an electricity consumption rate. As result, knowing influence conditions demand and critical for adapting, planning, forecasting changing organization's needs. Several factors influencing...

Zinc selenide (ZnSe) nanomaterial is a binary semiconducting material with unique features, such as high chemical stability, photosensitivity, low cost, great excitation binding energy, non-toxicity, and tunable direct wide band gap. These characteristics contribute significantly to its usage sensors, optical filters, photo-catalysts, recording materials, photovoltaics, among others. The light energy harvesting capacity of this can be enhanced tailored meet the required application demand...

An electro‐mechanical analysis of a microcantilever beam considering the effect size dependence and flexible supports is presented. Both static dynamic analyses are performed to show coupled support electrical voltage on performance beam. The wavelet‐based finite element method (FEM) used derive elastodynamic model energy expressions derived using couple stress theory, while additional terms introduced represent boundaries fringing fields. Numerical simulations comparisons with experimental...

Abstract Communication systems are greatly hampered by many disruptive noises in powerline communication (PLC), which come with strong interference, resulting the malfunction of PLC systems. Hence, there is a need to model noise and its effect on This paper presents modelling mitigation techniques for indoor broadband To noise, frequency domain measurements employing GSP‐930 spectrum analyser were carried out determine response range 1–30 MHz. The results obtained plotted. While analytical...