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This paper presents numerical simulation results of a passive magnetic bearing (PMB) used in Flywheel Energy Storage Systems FESS. The magnetic design, the modal analysis, aimed to outline the first six eigenmodes, and a kinetic analysis for the PMB with and without radial eccentricity are presented. These methods and results are valuable in the design phase of the PMB, for sizing its main parameters.
Stress-strain state in the structure of diamond abrasive tool at dynamic power load was simulated in grain-matrix system. For diamond tool with carbide tipped matrix was calculated amplitude and frequency characteristics and dynamic coefficients of construction for displacements and tension. Shown that the frequency of forced oscillations connected with the exploitation of the instrument considerably...
The inerter, a recently discovered mechanical element, is analyzed from a broader perspective of Chua's periodical table of electric elements and electro-mechanical analogies. It is shown that the inerter can be reduced to today's generally accepted mechanical equivalent of electric capacitor or inductor only for a linear relationship between force and acceleration. The actual position of the inerter...
This paper deals with a magneto dynamic modeling approach developed for a linear switched reluctance actuator. This approach is based on the exploitation of the magnetostatic finite elements model built for the studied actuator. The static characteristics of flux and forces, determined by the finite element simulations, for different positions of the moving part and different supply current levels,...
Finite element models of a large coach and two different dual-wave barriers which utilized on highway normally were established, to study the coach-barrier collision process. Dyna solver was used to simulate the dynamic response process with speed of 60km/h and collision angle of 20°. The results show that the protective effect of the two types of barriers on coach-barrier collision is significantly...
This paper presents the design of a new haptic feedback device for transradial myoelectric upper limb prosthesis that allows the amputee person to perceive the sensation of force-gripping and object-sliding. The system designed has three mechanical-actuator units to convey the sensation of force, and one vibrotactile unit to transmit the sensation of object sliding. The device designed will be placed...
In this paper we present the designs and analysis of different shapes of microneedles. We determined which one is the most appropriate for transdermal drug delivery purposes. The 450 μm microneedles length as long as their 70 μm outer diameter and 26 μm inner diameter measures allowed us to reduce the loss factor at the moment of the insertion into the skin; also to be undetectable to the human nerve...
In order to study the thermal adaptability of piezoelectric actuated tracked mobile system, a theoretical model is developed for investigating the effect of ambient temperature on the characteristics of piezoelectric actuated tracked mobile system based on finite element method and Coulomb's friction law. In the analysis, the temperature-dependent mechanical properties of materials, thermal stress...
The vibration response characteristic caused by the change of gear meshing stiffness, friction, tooth backlash and so on is an important basis for fault diagnosis. In view of the situation that friction, tooth backlash and crack morphology are considered insufficiently, an analysis method of gear crack fault vibration response was proposed based on the mathematical model of time-varying mesh stiffness...
In order to measure the plantar pressure in real time, this paper developed an intelligent insole device using PVDF piezoelectric thin film. Eight sensors were used in the intelligent insoles and they are designed by double-layer PVDF piezoelectric films. The signals of the sensors was sampled and processed by the signal system composed of the preamplifier circuit and the power frequency filter circuit...
The paper demonstrates an analysis example of a flange-sealing structure. Taking the O-ring width and bolt pre-tightening force as tolerance-parameters, obtaining the stress response surface according to the loop analysis results by ANSYS, then extracting the stress results of randomized parameters from the stress response surface, plotting the stress response distribution and calculating the reliability...
In the present study, computational fluid dynamics (CFD) investigation of dust particle collection efficiency in a force feed venturi scrubber has been performed using ANSYS CFX. A Venturi scrubber provides an effective way to remove dust particles flowing in a contaminated gas which are captured in fine droplets formed due to disintegration of a liquid as a result of high kinetic energy of air. Eulerian-Lagrangian...
There is a lack of system-level finite element (FE) model which can directly predict the performance of a piezoelectric energy harvester connected with interface circuits and electric load. This work developed a system-level model of piezoelectric strain energy harvesting system by directly coupling the finite element and electrical circuits. The strain energy harvester (SEH) is a macro fibber composite...
The magnetic bearings are important component of magnetic suspension flywheel system. As three-pole magnetic bearings can be driven by three-phase inverter which is low power consumption, small volume and low cost, the three-pole magnetic bearings have attracted wide attention of scholars in the world. However, the force-current characteristic of the radial suspension force is nonlinear because of...
The objective of this paper is to quantitatively determine the influence of six design parameters on three performance parameters of electromagnetic repulsion mechanism. Six design parameters include mass of moving part, radius of repulsion plate, thickness of the repulsion plate, pre-charged capacitance, initial charging voltage of pre-charged capacitance, and driving coil turns. Three performance...
Gas insulated switchgear (GIS) is widely used for its good economic benefits. But mechanical faults caused by electromagnetic force occur occasionally. The conducting wire and the metal shell are exposed in the alternating electromagnetic field, which is caused by the load current and vortex. This leads to electromagnetic force because of electromagnetic induction. So it is necessary to analyze the...
In this article we present an approach to the description of Magnetohydrodynamic Auxiliary Propulsion system for docking assistance of autonomous vehicle. Preliminarily, an analytical model which includes an electromagnetic model and a thermal model is presented. Successively, in order to move beyond the analytical model, a 3-D MHD modeling tool and a Runge Kutta method based solver are presented...
Vibration of cylinder liners affects not only engine combustion performances but also tribological behaviour and noise radiations. However, it is difficult to characterize it experimentally due to multiple sources, strong background noise, and nonlinear transfer paths. Therefore, a finite element model is established in this study to predict the dynamic responses of cylinder liners under respective...
The most critical part of the induction machines which determines on their life time operation are rolling element bearings. To ensure reliable drive with an induction machine requires deep insight in electro-mechanical dynamics during its operation. The flexible multibody modeling technique enables the simulation of dynamic loads on all drive components. This paper focuses on complex dynamic modeling...
VisR ultrasound is an acoustic radiation force (ARF)-based imaging method that fits induced displacements to a 1D mass-spring-damper (MSD) model to estimate the ratio of viscous to elastic moduli, τ, in viscoelastic materials. A source of error in VisR τ estimation is complex and interrelated 3D system inertia. We hypothesize that error due to system inertia may be reduced by minimizing the volumetric...
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