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- Volume 7, Issue 2, 2014
Recent Patents on Mechanical Engineering - Volume 7, Issue 2, 2014
Volume 7, Issue 2, 2014
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High-Power and High-Reliability RF MEMS Switch Review
Authors: Wenchao Tian and Jianglei HuRF MEMS switch is one of new microwave devices with MEMS technology. Development directions of RF switch are high-power and high-reliability. It has many advantages, such as low loss, low power, excellent linearity, small size and easy integration. Its research status and performances are introduced in this paper. Relevant researches and patents are studied. Some measures to improve power and reliability are proposed. The application areas and major problems are analyzed. The development trends are presented.
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Recent Advances on the Design of Batteries and Fuel Cells for Automobiles
More LessAutomobiles partly or exclusively powered by electric sources are amongst the top priorities within the automotive industry, mobilizing researchers and engineers among all stakeholders: public laboratories, vehicle and part manufacturers, electricity providers, etc. This paper deals with US, European and world patents regarding batteries and fuel cells for automobiles, mainly passenger cars and light trucks. The main purpose of the article is to provide an overview of the most significant recent advances on the design, control and application of batteries and fuel cells as well as important components of such systems.
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Recent Advance on Fused Deposition Modeling
Authors: Zhe Shi, Yonggang Peng and Wei WeiAdditive manufacturing (AM) technique is a prospective technique used in the production of complex geometries, which integrates design as well as manufacture. Fused deposition modeling (FDM), one implementation of AM, is widely used for manufacture in numerous fields. As a printing technology, FDM is very flexible and relatively inexpensive, thus becoming a leading and dominant pattern in AM field. The paper reviews various patents and their progresses on FDM in recent years, where new structures and new devices are adopted in aspects such as printer head and filament storage devices, support structures, support materials and auxiliary measures. New inventions of printer head and filament storage devices cover the storage devices of the filament, temperature control method of the printer head, protection mechanism and printer head structure for multi-filament supply. Support structures are demonstrated by the construction algorithm and removal devices, as well as support materials. Detection technology and other measures are mentioned in the part of auxiliary measures. Current and future developments are also discussed and forecasted at the end of the paper.
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A Double-Toggle Clamping Unit of Injection Molding Machine
Authors: Quan Wang, Xiao Sun and Chaohua HuangThe clamping mechanism is one of the important components of injection molding machine. The double-toggle clamping unit is applied in clamping mechanism widely. But, the existing double-toggle clamping unit is connected by cross head driven clamping mold oil cylinder. In the process of movement, especially in the open limit position or a front connecting rod close to the vertical position, the wear is very serious as it may easily cause fracture of tail platen. The paper reviews various patents of clamping unit of injection molding machine through adopting new structures in recent years. The new structure of the double-toggle clamping is presented in this paper. The new structure provided with four pull rod extending connecting lugs. Each connecting ear is provided with corresponding pull rod passes through the guide hole. The cross head can be in sliding the sleeve in the four pull rod. Compared with the traditional toggle clamping, the motion of mold platen is stable and the fracture phenomenon of tail platen can be solved. The tail platen manufacturability and reliability is improved reducing the manufacturing cost due to saving “A” frame of tail platen.
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Actuation System Design for a Morphing Wing Trailing Edge
Authors: Ignazio Dimino, Domenico Flauto, Gianluca Diodati, Antonio Concilio and Rosario PecoraShape control of adaptive wings has the potential to improve aircraft aerodynamic performance during cruise. In recent years, several patents have been issued for inventions in the field of morphing wings, using hydraulic, electromechanical or smart material-based actuation concepts and architectures. In the framework of SARISTU project (EUFP7), the joint integration of different conformal morphing concepts in a laminar wing is investigated to improve aircraft performance through a 6% drag reduction, with a positive effect on fuel consumption and required take-off fuel load. An innovative seamless morphing wing incorporating a gapless morphing leading edge, a morphing trailing edge and a wingtip active trailing edge is developed to pursue optimal wing geometry for any flight condition. This paper proposes a state of the art technology to design the actuation system of a morphing trailing edge, consisting of a flexible outer skin and an internal driving mechanism. Focus is given to the modeling and analysis of the morphing actuation, and its integration in the seamless flexible trailing edge control surface. The actuation system is driven by servo rotary actuators and it is designed and established to control the wing trailing edge in order to obtain pre-defined airfoil shapes maximizing wing aerodynamic efficiency. The actuation concept relies on a quick-return mechanism driven by load-bearing actuators controlling the morphing ribs individually. The actuation system is both analytically and numerically addressed. To validate the design, experiments are then carried out with the purpose of estimating the control movement functions suitable for single airfoil camber variations. The morphing rib kinematics including the actuation system is designed to withstand operational pressure loads and actuation forces.
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Grinding Temperature with Nanoparticle Jet Minimum Quantity Lubrication
Authors: Yali Hou, Changhe Li, Dongkun Zhang, Dongzhou Jia and Sheng WangIn recent years, a large number of patents have been devoted to developing minimum quantity lubrication (MQL) grinding techniques for environment friendly, energy saving, and cost-effective grinding fluid alternatives. One patent involves the nanoparticle jet flow in the MQL of grinding lubricant supply systems. An MQL grinding lubricant is prepared by adding nanoscale solid particles into a degradable grinding liquid. The lubricant is turned into pulse liquid drops with fixed pressure, variable pulse frequency, and invariant liquid drop diameter. The pulse liquid drops are sprayed into a grinding region in the form of jet flow by an air-isolating layer formed by high-pressure gas. The system has the advantages of MQL technology, has high cooling performance and excellent tribological characteristic, and plays an important role in effectively avoiding grinding burn, thus enhancing the surface quality of the workpiece and realizing an efficient, low consumption, environment friendly, economic, low carbon, and clean production. The temperature field model of surface grinding with a nanoparticle jet flow of MQL and the proportionality coefficient model of the energy input workpiece were established. The surface grinding temperature fields of 45 Steel and 2Cr13 were numerically simulated. Results show that the surface temperature of the workpiece is significantly higher than the subsurface temperature, thus presenting a relatively large temperature gradient along the direction of workpiece thickness. Grinding depth significantly affects grinding temperature. The values of grinding temperature increase with increasing cutting depth. The uniform distribution rules of the 2Cr13 temperature field are observed in four cooling and lubrication approaches: dry grinding, flood grinding, MQL, and nanoparticle MQL jet flow. Experiments are conducted to verify the simulation results. The results show that grinding temperature increases significantly with the increasing peripheral velocity of the grinding wheel. Furthermore, the movement speed of a workpiece is inversely proportional to the grinding temperature and a larger cutting depth contributes to higher grinding temperature. These results are consistent with theoretical analysis and show the effectiveness of the simulation method.
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A Modified Particle Swarm Optimization for Form and Position Errors of Mechanical Parts
Authors: Chen X. Luo, Zheng T. Han, Chang L. Du and Yong S. ZhuBy studying the evaluation principles of mechanical parts’ form and position errors and many kinds of error algorithms, presented in recent patents and scientific articles, a project was proposed by using a modified particle swarm optimization (PSO) with linearly decreasing inertia weights to evaluate form and position errors. With its important parameters being analyzed based on the features of form and position errors’ evaluation, the modified PSO was proved to be of high accuracy and good robustness. The experiments were carried out for evaluating the form and position errors of a group of straight lines and planes produced by harmonic technologies, and the results indicated that the evaluation project was reliable. Finally, the modified algorithm was used to evaluate the roundness error and the cylindricity error of a transmission shaft and the evaluation results show the effectiveness of the modified PSO, compared with the results of a three coordinate measuring machine (CMM).
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Analysis and Optimization of Output Parameters using Taguchi Design Analysis
Authors: K. Senthil Kumar and J.S. SenthilkumaarThis paper deals with the analysis and optimization of the surface roughness and tool flank wear when machining super duplex stainless steel with uncoated carbide inserts as cutting tool. The experiments are repeated in three different cutting conditions namely the dry, wet and gas cooled machining. Cutting speed, feed rate and depth of cut are the input turning process parameters considered. Taguchi's Full Factorial design of experiments is followed. Taguchi method is also used to analyze and optimize the output response parameters. Validation experiments are carried out to compare the experimental results with the predicted optimal values. This paper discusses the analysis and optimization of the output responses when machining super duplex stainless steel by referring the recent patents and scholarly articles on the subject of machining, cutting tool and application of such materials.
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Experimental Study of Complex Structures Machining with an Electrochemical Micromachining System
Authors: Yong Liu and Shaofu HuangElectrochemical micromachining (EMM) is proposed as an effective micro machining technology to fabricate complex micro structures on hard-to-cut materials and various recent patents have been discussed in this paper. First, an EMM system that meets the requirements of the EMM process is built. Second, sets of comparative experiments are performed on super alloy plates to study the influence of main electrochemical machining parameters, such as electrical parameters, electrode diameters and electrolyte concentrations on the side gaps. Finally, after the preliminary experiments, some 2D and 3D complex micro structures with physical dimension of several ten micrometers are successfully fabricated on the nickel base superalloy plates, thereby demonstrating that EMM is a very promising micro-fabrication technology.
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