scholarly journals Analysis of Dynamic Characteristics and Power Losses of High Speed on/off Valve with Pre-Existing Control Algorithm

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4901
Author(s):  
Qi Zhong ◽  
Xiele Wang ◽  
Geng Xie ◽  
Huayong Yang ◽  
Cheng Yu ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Dynamic Characteristics ◽  
Hydraulic System ◽  
High Speed ◽  
Control Algorithm ◽  
Energy Conversion Efficiency ◽  
Power Losses ◽  
Closing Time ◽  
Energy Characteristics ◽  
Overall Performance

A high-speed on/off valve (HSV) is generally the core component of a digital hydraulic transmission system. Therefore, its dynamic characteristics often restrict the overall performance of the digital hydraulic system. Most of the current studies focus on the optimization on the dynamic characteristics or the energy characteristics, few studies have comprehensively considered the two characteristics of the valve together. In this paper, a pre-existing control algorithm (PECA) is proposed to improve the dynamic characteristics of the HSV, and simultaneously optimize the power losses of the HSV to improve its energy conversion efficiency. The results show that, compared with the traditional single-voltage driven strategy, the opening time of the PECA decreases by 29.4%, the closing time decreases by 59.6%, and the energy conversion rate increases by 7.9%.

Investigation and Analysis on the Performance of the Oscillating Buoy Wave Power Device under the South China Sea

2013 ◽  
Vol 321-324 ◽  
pp. 1365-1372
Author(s):  
Lai Feng Mao ◽  
Jun Zhang ◽  
Quan You Qu ◽  
Hong Zhou He
Keyword(s):  
South China Sea ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
South China ◽  
Dynamic Characteristics ◽  
Wave Energy ◽  
Energy Conversion Efficiency ◽  
Power Device ◽  
Wave Power ◽  
China Sea

The oscillating buoy wave power device is more effective than other devices in energy conversion efficiency, and now it has been widely applied in development of marine wave energy. The oscillating buoy, which is an important component for the oscillating buoy wave power device, is closely related to energy conversion efficiency. In this paper, considering applying conditions in South China Sea, the dynamic characteristic for oscillating buoy is simulated using AQWA software. By analyzing and comparing dynamic characteristics of several different structure bodies, an optimal structure buoy is obtained and it has better energy conversion efficiency.

scholarly journals Neuromorphic van der Waals crystals for substantial energy generation

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Sungsoon Kim ◽  
Sangjin Choi ◽  
Hae Gon Lee ◽  
Dana Jin ◽  
Gwangmook Kim ◽  
...  
Keyword(s):  
Energy Conversion ◽  
High Speed ◽  
Rational Design ◽  
Large Scale ◽  
Ion Selectivity ◽  
Diffusion Flux ◽  
Van Der Waals ◽  
Energy Conversion Efficiency ◽  
Ion Diffusion ◽  
Nanofluidic Channels

AbstractControlling ion transport in nanofluidics is fundamental to water purification, bio-sensing, energy storage, energy conversion, and numerous other applications. For any of these, it is essential to design nanofluidic channels that are stable in the liquid phase and enable specific ions to pass. A human neuron is one such system, where electrical signals are transmitted by cation transport for high-speed communication related to neuromorphic computing. Here, we present a concept of neuro-inspired energy harvesting that uses confined van der Waals crystal and demonstrate a method to maximise the ion diffusion flux to generate an electromotive force. The confined nanochannel is robust in liquids as in neuron cells, enabling steady-state ion diffusion for hundred of hours and exhibiting ion selectivity of 95.8%, energy conversion efficiency of 41.4%, and power density of 5.26 W/m2. This fundamental understanding and rational design strategy can enable previously unrealisable applications of passive-type large-scale power generation.

scholarly journals Characterization of energy conversion of multiferroic PFN and PFN:Mn

2013 ◽  
Vol 7 (4) ◽  
pp. 167-173 ◽  
Author(s):  
Lucjan Kozielski ◽  
Dariusz Bochenek
Keyword(s):  
Energy Conversion ◽  
High Speed ◽  
Ferroelectric Properties ◽  
Pyrochlore Phase ◽  
Energy Conversion Efficiency ◽  
Modern Technology ◽  
Point Of View ◽  
Synthesis Process ◽  
Multiferroic Materials

Characterization of energy conversion of multiferroic materials is concerned with multifunctional properties of materials, a topic that is fascinating from the scientific point of view and important for the modern technology. The complex characterization of multiferroic structures suffers at present from lack of a systematic experimental approach and deficiency of multifunctional magnetoelectric properties testing capabilities. Compactness and high frequency energy conversion capacity are the main reasons of invention and improvement of sophisticated materials which are prepared for high-speed computer memories and broadband transducer devices. As a consequence, one can easily notice an intense search for new materials for generation, transformation and amplification of magnetic and electric energies. In this scenario, the combination of excellent piezoelectric and magnetic properties makes lead iron niobate Pb(Fe1/2Nb1/2)O3 (PFN) an attractive host material for application in integrated magnetoelectric energy conversion applications. PFN multiferroic materials are attractive for commercial electroceramics due to high value of dielectric permittivity and magnetoelectric coefficients as well as relatively easy synthesis process. However, synthesis of PFN ceramics is mostly connected with formation of the secondary unwanted pyrochlore phase associated with dramatic decrease of ferroelectric properties. The authors have successfully reduced this negative phenomenon by Mn doping and finally present high piezoelectric and magnetoelectric energy conversion efficiency in fabricated PMFN ceramics.

scholarly journals Effects of Pulse Voltage Duration on Open–Close Dynamic Characteristics of Solenoid Screw-In Cartridge Valves

Processes ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 1722
Author(s):  
Daling Yue ◽  
Linfei Li ◽  
Liejiang Wei ◽  
Zengguang Liu ◽  
Chao Liu ◽  
...  
Keyword(s):  
Dynamic Characteristics ◽  
High Speed ◽  
Control Method ◽  
Low Cost ◽  
Pulse Voltage ◽  
Experimental Comparison ◽  
Negative Pulse ◽  
Closing Time ◽  
Opening And Closing ◽  
Design And Manufacture

The hydraulic high-speed on/off valve (HSV)—the critical core component of digital hydraulic technology—has a special structural design and manufacture due to its fast opening and closing, which results in high prices and maintenance costs. The solenoid screw-in cartridge valve (SCV) is widely used in the hydraulic industry because of its merits, such as mature technology, reliable quality, and low cost. The contribution of this study is to replace the high-speed on/off valve with the SCV in some areas of application by introducing positive and negative pulse voltage control for the coil of the SCV, which only modifies the control circuit and needs no change in structure. Based on the analysis of the structure of the SCV, the simulation model was developed in AMESim and validated by experiments to investigate the effects of the pulse voltage duration on the open–close dynamic characteristics and find the optimal pulse voltage duration, so that the SCV can open or close in the shortest time to reduce energy loss as far as possible. The simulation results showed that the positive and negative pulse voltage could quicken the rising or declining speed of the coil current and dramatically decrease the opening and closing delay time. By the experimental comparison with the original control method, the opening time of the SCV decreased from 30 ms to 13 ms, and the closing time was reduced from 139 ms to 14 ms.

scholarly journals Investigation on Electromagnetic Models of High-Speed Solenoid Valve for Common Rail Injector

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Jianhui Zhao ◽  
Liyun Fan ◽  
Peng Liu ◽  
Leonid Grekhov ◽  
Xiuzhen Ma ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Magnetic Materials ◽  
Conversion Efficiency ◽  
High Speed ◽  
Energy Conversion Efficiency ◽  
Solenoid Valve ◽  
Electromagnetic Energy ◽  
Soft Magnetic Materials ◽  
Soft Magnetic ◽  
Drive Current

A novel formula easily applied with high precision is proposed in this paper to fit the B-H curve of soft magnetic materials, and it is validated by comparison with predicted and experimental results. It can accurately describe the nonlinear magnetization process and magnetic saturation characteristics of soft magnetic materials. Based on the electromagnetic transient coupling principle, an electromagnetic mathematical model of a high-speed solenoid valve (HSV) is developed in Fortran language that takes the saturation phenomena of the electromagnetic force into consideration. The accuracy of the model is validated by the comparison of the simulated and experimental static electromagnetic forces. Through experiment, it is concluded that the increase of the drive current is conducive to improving the electromagnetic energy conversion efficiency of the HSV at a low drive current, but it has little effect at a high drive current. Through simulation, it is discovered that the electromagnetic energy conversion characteristics of the HSV are affected by the drive current and the total reluctance, consisting of the gap reluctance and the reluctance of the iron core and armature soft magnetic materials. These two influence factors, within the scope of the different drive currents, have different contribution rates to the electromagnetic energy conversion efficiency.

Current progress and performance improvement of Pt/C catalysts for fuel cells

2020 ◽  
Vol 8 (46) ◽  
pp. 24284-24306
Author(s):  
Xuefeng Ren ◽  
Yiran Wang ◽  
Anmin Liu ◽  
Zhihong Zhang ◽  
Qianyuan Lv ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Energy Conversion ◽  
Performance Improvement ◽  
Electric Energy ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Carnot Cycle ◽  
High Energy Conversion Efficiency ◽  
And Performance

Fuel cell is an electrochemical device, which can directly convert the chemical energy of fuel into electric energy, without heat process, not limited by Carnot cycle, high energy conversion efficiency, no noise and pollution.

First-principles study on the electronic and optical properties of the orthorhombic CsPbBr3 and CsPbI3 with Cmcm space group

2021 ◽  
Author(s):  
Xianhao Zhao ◽  
Tianyu Tang ◽  
Quan Xie ◽  
like gao ◽  
Limin Lu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Solar Cells ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
First Principles ◽  
Energy Conversion Efficiency ◽  
Space Group ◽  
Absorbing Materials ◽  
Halide Perovskites ◽  
Lead Halide

The cesium lead halide perovskites are regarded as effective candidates for light-absorbing materials in solar cells, which have shown excellent performances in experiments such as promising energy conversion efficiency. In...

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