Abstract Nanophotonic engineering of light–matter interaction at subwavelength scale allows thermal radiation that is fundamentally different from traditional emitters and provides exciting opportunities for various thermal-photonic applications. We propose a new kind integrated electrically controlled emitter exploits layered metamaterials with lithography-free dielectric/metallic nanolayers. demonstrate both theoretically experimentally the proposed concept can create strong photonic...

Abstract A new organic synthetic anion exchange resin (LSC‐436) containing cyclohexylamine group was prepared for the sorption of rhenium. The traditional batch tests were applied to investigate mechanism rhenium on LSC‐436 with respect contact time, initial concentration, value pH and amount resin. experimental data obtained from modeled using Langmuir/Freundlich isotherms pseudo‐first‐kinetic pseudo‐second‐kinetic models obtain key dynamic parameters investigating characterized scanning...

In this paper, a new method for measuring the cage speed based on ultrasonic reflection principle is proposed. By emitting high-frequency ultrasound signal penetrating bearing outer ring and detecting its echo continuously, time of each rollers passing under probe can be recorded accurately by change in signal. Then, rotation roller obtained counting frequency rollers. For cages working conditions, share same speed, where an indication operation. Compared to optical measurement cage, does...

A numerical dynamic analysis of ball bearing is presented. The normal contact forces between balls and races are calculated, respectively, based on Hertz theory elastohydrodynamic lubrication theory, the results compared to study effect simulation. model developed with assumptions that outer race fixed in space other elements have six degrees freedoms. lubricant film equivalent as spring–damper system when considered. equations motion solved by fourth-order Runge-Kutta integration method...

Purpose The purpose of this study is to present a numerical model for scratched tilting-pad bearings (STPBs) with nonuniform grids. In addition, the used reveal effects structural parameters on dynamic characteristics STPBs under impact loading. Design/methodology/approach By combining Reynolds equation, flow balance equation and assumption adiabatic shafts, thermo-hydrodynamic grids journal was built. Describing motion shaft using Euler method introducing pad-tilting-angle modification...

This paper describes a measurement of lubricant-film thickness in roller bearing using new ultrasonic pulser-receiver, which has maximum pulse repetition rate (PRR) 100 kHz. The experimental results show that higher PRR can help to get more points and details the oil-film distribution. Furthermore, influence rotor vibration response for is discussed, keeping with simulation result. Finally, limits are discussed detail effect transducer focal zone size also observed.

Purpose The purpose of this paper is to investigate the effect cage-pocket wear on dynamic behavior ball bearing. Design/methodology/approach Through analyzing complicated relationship and interactions among bearing elements, modeling was established considering gravity, drag force from oil, hydrodynamic cage simulations with different amounts loss (BPWL) were obtained by solving equations using Runge–Kutta method. Findings results show that trajectory cage’s centroid presents two vibration...

Inductive particle sensors have been widely used in wear monitoring for mechanical equipment, which magnetostatic inductive sensor is the preferred choice to detect ferro-particles. However, existing contain iron core components, and most of them are driven by external power supply, makes it difficult achieve lightweight vulnerable electromagnetic noise. Accordingly, this paper proposes a passive ferro-particle lube-oil based on single permanent magnetic ring. The corresponding mathematical...

High-speed precision machining is one of the important development directions modern technology, high-speed spindle system widely used in machining, and motorized main choice machine tool spindle. The electromagnetic force caused by rotor unbalance vibration sources Firstly, research on frequency spectrum characteristic under different eccentricities very necessary to suppress vibration. An finite element model was built for a based Ansoft Maxwell this paper. variation static dynamic...

Abstract The present study deals with the dynamic responses of an infinite plate resting on a poroelastic layered half‐space soil medium imperfect interfaces to moving load. Kirchhoff thin theory is employed analyze plate, while Biot's fully used characterize half‐space. Applying Fourier transform and vector functions, completely coupled system equations motion for are reduced decoupled ordinary differential which could be solved semi‐analytically. propagation relationships structure derived...

The paper investigates the role of radial load and rotating speed on high frequency vibration a deep groove ball bearing. Firstly, bearing dynamic model with 6-DOF balls was established, considering interactions between balls, races cage. solved by fourth order varying steps Runge-Kutta integration. spectrums response were analyzed yule-walker FFT. Secondly, verification experiment done different loads speeds. Finally, compared numerical experimental results, similar trend emerged. Higher...

The quality of grouting in pre-stressed pipelines plays a critical role ensuring the safety and durability concrete bridges. In this study, transmission wave method was proposed as means to assess pipelines. ABAQUS finite element simulation (FE simulation) used study propagation hammer stress waves pipes. A full-scale test conducted verify numerical using AGI-BWG instrument system developed detect grouting. results show that speed transmitted increases frequency shifts towards higher...

Purpose The purpose of this paper is to demonstrate the theoretical relationship between layout four‐sensor dynamic acoustic array tracking system and systematic observation accuracy, provide an algorithm determine optimal arrangement indicator evaluate measurement accuracy. Design/methodology/approach In present paper, principle analyzed, model conversion models are established. Subsequently, optimization for deduced, obtained based on position dilution precision function (PDOPF) 2D target,...

Purpose In the context of fixed-wing aircraft wing assembly, there is a need for rapid and precise measurement technique to determine center distance between two double-hole components. This paper aims propose an optical-based spatial point using triangulation method. The purpose this design specialized system, specifically spherically mounted retroreflector nest (SMR nest), equipped with laser displacement sensors rotary encoder as core achieve accurate measurements double holes....