This research is focused on energy harvesting from track vibration in order to provide power for the wireless sensors which monitor railroad health. Considering that has energy, a new method proposed paper harvest based piezoelectric effect. The generator called drum transducer key part harvesting. model of established and simulation results show it can generate 100 mW real situation. In addition, an experiment rig developed its also established. peak open-circuit voltage about 50–70 V at...

Two novel nonparametric identification approaches are proposed for piezoelectric mechanical systems. The novelty of the is using not only signals but also electric signals. expressions unknown and terms given based on Hilbert transform. decomposed re-assembled to obtain smooth stiffness damping curves. current mapping approach developed identify accurately a system with strongly nonlinear terms. successfully implemented simulate obtained from different systems, including Duffing...

In this paper, a braking energy recovery system based on super-capacitor was presented. The method use and the conventional resistance constitute new unit to realize regenerative recovery, when braking, will be stored in by DC/DC converter. meanwhile, still keep ensure security. order validate design do further research, paper established mathematical model simulation of whole system, which include power supply unit, traction motor driven control etc. is AC motor, parameters are set...

In this paper, the vacancy formation at interface between different grains (Ag3Sn and βSn) induced by electromigration was investigated from perspective of atom diffusion. To explain micro-mechanism void near interface, diffusion coefficient specifically studied here via molecular dynamics (MD) simulation. By comparing rates atoms in βSn Ag3Sn, a significant difference could be observed when temperature is up to 400 K. The Sn have higher (8E − 9 cm2/s) than Ag3Sn (4E cm2/s), which indicated...

The vibration energy of the track slab can be converted into electric for wireless sensors by piezoelectric harvesters. A laminated circular plate harvester (TLCP harvester) is designed in this paper based on foundation excitation. central frequency 222 Hz, which matched with 222.8 Hz slab. stiffness curve, damping, equivalent capacitance, and electromechanical coupling coefficient are obtained through experiment. harmonic balance method Runge–Kutta's voltage results consistent experimental...

Molecular dynamics simulations have been carried out for glycerol–water–sodium chloride ternary solution due to its important role in cryopreservation engineering. The radial distribution functions atom pairs potentially related C–H ··· O and O–H hydrogen bonds were calculated. the H (connected C)–O pair do not exhibit peaks between 2 3 Å, whereas C–O distinct 4 Å. reason this is because most geometries are bent deviate from linearity. ratios of acceptor donor numbers water glycerol...

In this paper, a new onboard energy storage system (ESS) is designed. addition, the experiment developed for recovery of metro vehicle braking. The proposed ESS not connected to DC bus, but brake chopper in inverter. has simple structure and high reliability due its independence from traction system, it does feedback system. mathematical model dynamics was studied. A scaled simulate conditions test characteristics ESS. whole modeled simulated Matlab/Simulink software. results show that...

To harvest acoustic energy from urban railways, a novel and practical harvester is developed. The consists of piezoelectric circular plate Helmholtz resonator. Based on the field test data resonance frequencies resonator are near 800 Hz. designed to amplify sound pressure. Thus, lumped parameter model established. used convert mechanical into electrical energy. simulation results show that output power approximately 25 μ W maximum voltage 0.149 V under excitation railway noise. experiment...

Unmanned ground vehicle control system is a "human in the loop" mode, which needs remote instead of manipulating directly. This paper mainly introduces development UGV, including configuration and function, typical systems driver assistance domestic overseas. By analyzing application background, scope related technologies, future directions trends UGV are proposed. The technical analysis research this great significance for development.

Austenitic stainless steel (ASS) exhibits considerable work-hardening upon deformation while retaining the characteristics of material. The high rate austenite hardening was utilized by cold stretching (CS) cryogenic pressure vessels. A few percent will give vessel a and homogeneous yield strength improvement, wall thickness may be greatly reduced. authors have conducted extensive experimental numerical studies on CS vessels from ASS. summary our work as well brief introduction history,...

method, the extended tanh soliton-like solution, kink plural solutions.

For the frequency difference of arrival (FDOA) estimation in passive location, this paper transforms into radial velocity estimation, which is difficult to achieve a high accuracy due mismatch between sampling period and pulse repetition interval. The proposed algorithm firstly estimates point-in-time that each arrives at two receivers accurately. Secondly time (TOA) sequences are subtracted. And finally target relative stations with least square method estimated. This only needs accurate...

We propose a scheme for realizing entanglement transfer based on the cross-Kerr nonlinear interaction between field-modes. By using this can be transferred from field-states with discrete variables to continuous variables. suitably choosing amplitude of initial coherent states，we obtain maximum entangled states.

According to the implementation of about 65% building energy efficiency standards in china, existing external wall insulation technology will face severe challenges. The traditional organic materials representative with polystyrene, due some defects，such as poor fire resistance, durability, short service and no synchronous life structure, environmental pollution, especially fires CCTV 2009 under construction at Shanghai pudong south road NO.1 2010, October 8 morning, have solicited research...