http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
A New Vibration Energy Harvester Using Magnetoelectric Transducer
Jin Yang,Yumei Wen,Ping Li,Xianzhi Dai,Ming Li 한국자기학회 2011 Journal of Magnetics Vol.16 No.2
Magnetoelectric (ME) transducers were originally intended for magnetic field sensors but have recently been used in vibration energy harvesting. In this paper, a new broadband vibration energy harvester has been designed and fabricated to be efficiently applicable over a range of source frequencies, which consists of two cantilever beams, two magnetoelectric (ME) transducers and a magnetic circuit. The effects of the structure parameters, such as the non-linear magnetic forces of the ME transducers and the magnetic field distribution of the magnetic circuit, are analyzed for achieving the optimal vibration energy harvesting performances. A prototype is fabricated and tested, and the experimental results on the performances show that the harvester has bandwidths of 5.6 ㎐, and a maximum power of 0.25 ㎽ under an acceleration of 0.2 g (with g = 9.8 ㎳²).
Wideband and 2D vibration energy harvester using multiple magnetoelectric transducers
Jin Yang,Qiangmo Yu,Jiangxin Zhao,Nian Zhao,Yumei Wen,Ping Li 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.16 No.4
This paper investigates a magnetoelectric (ME) vibration energy harvester that can scavenge energy in arbitrary directions in a plane as well as wide working bandwidth. In this harvester, a circular cross-section cantilever rod is adopted to extract the external vibration energy due to the capability of it\'s free end oscillating in arbitrary in-plane directions. And permanent magnets are fixed to the free end of the cantilever rod, causing it to experience a non-linear force as it moves with respect to stationary ME transducers and magnets. The magnetically coupled cantilever rod exhibits a nonlinear and two-mode motion, and responds to vibration over a much broader frequency range than a standard cantilever. The effects of the magnetic field distribution and the magnetic force on the harvester\'s voltage response are investigated with the aim to obtain the optimal vibration energy harvesting performances. A prototype harvester was fabricated and experimentally tested, and the experimental results verified that the harvester can extract energy from arbitrary in-plane directions, and had maximum bandwidth of 5.5 Hz, and output power of 0.13 mW at an acceleration of 0.6 g (with g=9.8 ms-2).
Jin Yang,Lei Cai,Sen Zhang,Xiangjia Zhu,Peng Zhou,Yi Lu 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.3
This study aimed to investigate whether silicacerium(III) chloride (CeCl3) nanoparticles could inhibitthe formation of advanced glycation end-products (AGEs)and reduce oxidative stress. Silica-CeCl3 nanoparticleswere synthesised by adsorption and embedment withmicro-silica materials, forming uniform nanoparticles witha diameter of approximately 130 nm. Chaperone activityassays and AGEs formation assays, and intracellular reactiveassays were adopted in this study to evaluate CeCl3nanoparticles effect. UV–visible spectrometry showed thatsilica-CeCl3 nanoparticles at low concentrations rapidlyformed tentatively stable conjugations with a-crystallin,greatly enhancing the chaperone activity of a-crystallin. Moreover, silica-CeCl3 nanoparticles markedly inhibitedthe fructose-induced glycation of a-crystallin, showing anadvantage over the control drugs aminoguanidine andcarnosine. Silica-CeCl3 nanoparticles also reduced intracellularreactive oxygen species production and restoredglutathione levels in H2O2-treated human lens epithelialcells. These findings suggest that silica-CeCl3 may be usedas a novel agent for the prevention of cataractogenesis.
Adaptive Control with a Fuzzy Tuner for Cable-based Rehabilitation Robot
Jin Yang,Hang Su,Zhijun Li,Di Ao,Rong Song 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.3
Since there are external uncertainties in the environment and the dynamic properties of human arm aretime-varying during movement, it is difficult to achieve good tracking performance during robot-aided rehabilitation. The purpose of this study is to develop an adaptive controller with a fuzzy tuner for a cable-based rehabilitationrobot. The fuzzy tuner can adjust the control parameters according to position error and the change of error, thus thetime-varying control parameters can be optimized by this tuner. To verify the proposed controller, simulation andexperiment studies using the cable-based rehabilitation robot are carried out. The rehabilitation robot is employedto complete two facilitation movements in the experiment. Results show that the adaptive controller can attain bettercontrol performance after tuning the control parameters.
Jinyang Xu,Mohamed El Mansori 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.1
Stacked composite CFRP/Ti is identified as an innovative structural configuration for manufacturing the key aircraft components favoring energy saving in the modern aerospace industry. Machining of this composite-to-metal alliance exhibits the most challenging task in manufacturing community due to the disparate natures of each phase involved and their respective poor machinability. Since the experimental studies are highly cost and time consuming, the numerical approach should be a capable alternative to overcoming the several technical limitations involved. In this research, an original FE model was developed to simulate the complete chip formation process when orthogonal cutting (OC) of hybrid CFRP/Ti stacks. Different constitutive models and failure criteria were implemented into the Abaqus/Explicit code to construct the entire machining behavior of the stacked composite material. The stack model was built to replicate accurately the key physical phenomena activated in the hybrid cutting operation. Special concentration was made on the comparative studies of the effects of different cutting-sequence strategies on the machining responses induced by CFRP/Ti cutting. The numerical results highlighted the significant role of cutting-sequence strategy in affecting the final machined surface morphology and subsurface damage extent, and hence emphasized the importance of selecting reasonable cutting-sequence strategy for hybrid CFRP/Ti machining.
Cutting Modeling Using Cohesive Zone Concept of Titanium/CFRP Composite Stacks
Jinyang Xu,Mohamed El Mansori 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
In modern aerospace industry, hybrid CFRP/Ti stacks have taken a prominent position in manufacturing aircraft and spacecraft structural components due to their combined resistance and enhanced characteristics favoring the energy saving. Compared to the great interest of experimental studies, nearly rare scientific literature deals with the numerical modeling of hybrid CFRP/Ti cutting. This is the key incentive that motivates the current research to propose an original FE model to address the mentioned issues. The FE model was developed into Abaqus/Explicit commercial code. The CFRP phase was modeled as an equivalent homogeneous material (EHM) by implementing Hashin damage criteria to simulate the rupture and separation of the fiber/matrix system. The Ti phase was assumed isotropic with elastoplastic behavior, and Johnson-Cook criteria were utilized to replicate the local failure of the metallic phase. The CFRP/Ti interface physically described as an intermediate constituent was modeled through the concept of cohesive zone (CZ). The multiple aspects of machining responses induced in hybrid CFRP/Ti cutting were precisely investigated with a special focus on the interface damage formation. The numerical results highlighted the significant effects of feed rate on the force generation and the pivotal role of bi-material interface consumption (BIC) in affecting the interface delamination.
Drilling Machinability Evaluation on New Developed High-strength T800S/250F CFRP Laminates
Jinyang Xu,Ming Chen,Qinglong An,Xiaojiang Cai 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
The new developed high-strength CFRP laminates are widely employed in varieties of applications and are mainly used in main loadbearing structural components of large commercial aircrafts. Drilling is one of the important operations in manufacturing composite structure, often a final operation during assembly. Defects such as burrs and delamination in drilling of CFRP are always serious problems and lead to rejection and impose heavy loss. In the present research, the machinability of a new developed high-strength T800S/250F CFRP laminate is evaluated by using CVD coated twist drill and CVD coated dagger drill. The machinability was investigated in terms of drilling forces, burr defect, hole wall surface morphology and delamination damage. The results indicate that feed rate is the most significant factor affecting the machined surface finish followed by the spindle speed. The dagger drill showed excellent drilling performance than the twist drill and was more suitable for drilling of T800S/250F CFRP laminate. The results also highlight the importance of employing the high speed drilling to minimize the drilling-induced defects.