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方向盘±720°绝对角位置的测量是轮式驱动电动汽车转矩协调控制解决方案的关键之一.通过16位处理器dsPIC30F6010A与两片TLES012通信,设计了一种基于iGMR的+720°绝对角位置非接触式传感器,并可通过外部中断设置方向盘的回正零点.给出了该传感器的具体实现方案,包括2个从动齿轮的齿数设计,绝对角位置的计... 相似文献
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提出了线阵CCD微米级非接触式圆钢光电测径仪的设计方案,并以ARM微处理器和单片机为核心实现了设计;解决了传统圆钢测径方法接触式测量的局限问题,具有结构简单、小型化、非接触、精度高等特点。实验结果表明,该系统实现了CCD非接触式圆钢光电测径,测量结果准确、精度高、稳定性好,且可直接方便地显示测量结果。 相似文献
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在介绍根据布儒斯特定律测量玻璃材料折射率的方法和用磁阻式角度传感器测角原理的基础上,提出一种利用角度传感器测量材料折射率的新方法,实现了角度量和材料折射率的非电量电测。通过用此方法测量2种玻璃样品的折射率与理论值进行比较,发现在不考虑传感器温度漂移及装置的平整性等系统误差的条件下,折射率测量的相对误差小于3%。研究还表明:新型锑化铟磁阻角度传感器的线性范围约200°,为设计非接触式角度量及折射率的自动测量系统打下了基础。 相似文献
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为了增强机器人人机交互系统的自然性,提出了基于多种传感器的非接触式人机交互系统设计方案,系统通过检测操作者手部动作和手部位置姿态的变化实现机器人的遥操作。研制了肌电传感器,获取手臂上一对拮抗肌上的表面肌电信号,并以此来判断机器人操作者的部分手部动作;利用Kinect体感设备和惯性测量单元获取手臂三维位置和姿态角信息。通过网络将人手的动作及位置姿态发送至机器人控制系统,以完成对机器人的控制。系统综合多种传感器的优点,极大减小了传统接触式交互方式对操作者运动范围的限制,实现了自然交互,实验表明了其有效性。 相似文献
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对旋转机械的转轴进行在线监测,一般都采用非接触式位移传感器。非接触式位移传感器是基于电涡流原理设计制造的,整个系统是由探头、延伸电缆和前置器组成的一次仪表测量系统。最近,德国申克公司推出了一种新型传感器VIBRONECS,其设计思想是采用混合集成电路的方法,把延伸电缆和前置器的功能用一块电子线路板代替,和探头线圈封装在一起, 相似文献
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研究了一种基于应力控制的金属薄壳结构变形修复方法,通过应用该方法成功实现了飞机整体油箱金属结构变形故障的修复。该方法在能量原理研究的基础上,通过研究变形修复中的结构内应力控制,在变形部位施加反向应力,使变形的金属薄壳结构恢复至原始形貌,从而达到修复变形的目的。整体油箱作为典型的金属薄壳结构,在修复过程中还需要保证气动外形、隐身功能等飞机特有的功能特性,因此,该变形修复过程需要多结构系统协调平衡、多领域综合优化。在修复飞机整体油箱这一典型金属薄壳结构变形故障的实践过程中,研究基于应力控制的金属薄壳结构变形修复方法,实现了对整体油箱金属薄壳结构的变形修复,对金属薄壳结构变形修复的研究具有重要的指导意义,为相关领域的变形修复提供了新的思路。 相似文献
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为了实现飞机在任意飞行姿态下燃油量的测量,提出了一种新型的飞机燃油测量 系统。首先采用基于计算机视觉的非接触性液位感测技术,测得油箱中油位高度。然后采用 CAD 技术对油箱建模,实现了飞行姿态误差的修正。实现在油箱外对当前液面进行实时观测和 三维重建,无需对油箱内燃油通电,避免了传统测量方式的电磁干扰、电路磨损问题,提升了 燃油系统的安全性和可靠性。实时精确地测量剩余燃油量,对飞机的加输油控制、系统状态监 控、故障诊断隔离等功能具有重要意义。该油量测量方式与传统方式相比具有数字化、智能化 程度高、抗干扰能力强、可靠性高等优点。 相似文献
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This paper presents a method for wing aerostructural analysis and optimization, which needs much lower computational costs, while computes the wing drag and structural deformation with a level of accuracy comparable to the higher fidelity CFD and FEM tools. A quasi-three-dimensional aerodynamic solver is developed and connected to a finite beam element model for wing aerostructural optimization. In a quasi-three-dimensional approach an inviscid incompressible vortex lattice method is coupled with a viscous compressible airfoil analysis code for drag prediction of a three dimensional wing. The accuracy of the proposed method for wing drag prediction is validated by comparing its results with the results of a higher fidelity CFD analysis. The wing structural deformation as well as the stress distribution in the wingbox structure is computed using a finite beam element model. The Newton method is used to solve the coupled system. The sensitivities of the outputs, for example the wing drag, with respect to the inputs, for example the wing geometry, is computed by a combined use of the coupled adjoint method, automatic differentiation and the chain rule of differentiation. A gradient based optimization is performed using the proposed tool for minimizing the fuel weight of an A320 class aircraft. The optimization resulted in more than 10 % reduction in the aircraft fuel weight by optimizing the wing planform and airfoils shape as well as the wing internal structure. 相似文献
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飞机燃油箱惰化系统属飞机燃油系统设计中重要的分系统,为了准确评估燃油箱惰化系统的功能与性能,需要根据飞机实际使用剖面和惰化系统设计特点确定适用的飞行测试方法。提出了一种基于电化学原理的飞机燃油箱氧浓度机载测量方法,用于飞行实时测量运输类飞机油箱内无油空间或惰化管路的气体氧浓度,并对飞行中的实际影响因素进行模拟分析。经过分析飞行实际环境影响因素、关键传感器匹配性以及原理样机的试验验证等工作,将燃油箱氧浓度机载测量技术转化为专用的飞机燃油箱氧浓度机载测量系统,并通过了飞行实测考验。试飞结果表明,该项技术能够实时准确测量运输类飞机各种状态下的燃油箱氧浓度,满足飞机燃油箱惰化系统的效能评估要求。 相似文献
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Duc-Vinh Le 《Computer Methods in Applied Mechanics and Engineering》2010,199(37-40):2622-2632
This paper presents a numerical method for studying the large deformation of a liquid capsule enclosed by a thin shell in a simple shear flow. An implicit immersed boundary method is employed for calculating the hydrodynamics and fluid–structure interaction effects. A thin-shell model for computing the forces acting on the shell middle surface during the deformation is described within the framework of the Kirchhoff–Love theory of thin shells. This thin-shell model takes full account of finite-deformation kinematics which allows thickness stretching as well as large deflections and bending strains. The interpolation of the reference and deformed surfaces of the shell is accomplished through the use of Loop's subdivision surfaces. The resulting limit surface is C1-continuous which significantly improves the ability of the method in simulating capsules enclosed by hyperelastic thin shells with different physical properties. The present numerical technique has been validated by several examples including an inflation of a spherical shell and deformations of spherical, oblate spheroidal and biconcave capsules in the shear flow. In addition, different types of motion such as tank-treading, tumbling and transition from tumbling to tank-treading have been studied over a range of shear rates and viscosity ratios. 相似文献
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We consider the problem of active reduction of the structural vibrations induced by the sloshing of large masses of fuel inside a partly full tank. The proposed study focuses on an experimental device mimicking an aircraft wing made of an aluminium rectangular plate equipped with piezoelectric patches at the clamped end and with a cylindrical tip tank, more or less filled with liquid. After deriving a representative finite-dimensional model of the complete system, containing the first five structural modes of the plate and the first three liquid sloshing modes, a controller is computed. Since our main scope is to control the most energetic mode of the structure, a full state-feedback method coupled with an observer is used. Finally, the controller is also tested for different initial conditions/perturbations and the results are compared with the ones obtained with an H ∞ controller. Experimental results illustrate the relevance of the chosen strategy. 相似文献
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针对类似于飞机油箱环境中连续型机器人的路径规划问题,设计基于区域行进策略的路径规划算法,结合机器人本体结构约束规划到达油箱内任意给定目标点的路径。连续型机器人具有运动灵活性,但超冗余自由度导致了三维空间规划的多解性,增加了算法的复杂度。采用降低维度的方式,通过将三维空间转化为二维平面进行规划,降低了算法的时间复杂度。将飞机油箱的单舱划分为两个区域,根据目标点所处区域位置确定规划策略。最后,基于Matlab对所提算法进行仿真,实验结果验证了算法的可行性和有效性。 相似文献
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Deformation due to residual stress is a significant issue during the machining of thin-walled parts with low rigidity. If there are multiple processes with deformation during machining, some process suitability issues will appear. On this occasion, the actual geometric state of the deformed workpiece is needed for process adjustment. However, it is still a challenge to obtain the complete geometry information of deformed workpiece accurately and efficiently. In order to address this issue, a time-varying geometry modeling method, combining cutting simulation and in-process measurement, is proposed in this paper. The deformed workpiece model can be reconstructed via transforming the deformed workpiece with only a small amount of the measurement points by superimposing material removal and workpiece deformation simulation according to a time sequence, which takes advantage of the proposed Curved Surface Mapping based Geometric Representation Model (CSMGRM). Machining experiment of a typical structural part has shown that the deformed geometry model of the whole workpiece can be reconstructed within the error of 0.05mm, which is less than one tenth of the finish machining allowance in general cases, and it is sufficient to meet the accuracy requirements for interference or overcut/undercut analysis and process adjustment. 相似文献