共查询到17条相似文献,搜索用时 171 毫秒
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针对外科手术力觉信息采集对多维力传感器提出的低量程和高分辨率的要求,对常规的十字梁六维力传感器进行结构改进,设计了一种具有滑移结构的低维间耦合的小量程六维力传感器。分析了传感器结构抑制维间耦合的机理,通过有限元方法分析了其受力变形情况。标定实验表明:该六维力传感器非线性误差与维间耦合误差均小于2%,具有高灵敏度、高分辨率和低维间耦合的特点。 相似文献
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针对多维传感器广泛存在维间耦合效应,精度难以提高的问题,设计了一种具有自解耦特性的新型六维力/力矩传感器.采用有限元法对该传感器弹性体进行静力分析,研究了结构在不同工况下的应力应变分布.基于结构变形特点,对特征点位置和布片组桥方式进行了优化.同时也对结构进行了维间耦合分析,验证了该新型传感器具有耦合效应低的优点,提高了传感器的精度,具有较好的应用前景. 相似文献
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为满足六维力传感器的高刚度要求,使用固支约束代替铰约束。通过对传感器样机单维加载获得的标定数据进行处理,发现在使用求解标定矩阵或BP神经网络训练的方法时,分别存在维间耦合较大和多维加载误差极大的问题。对此提出一种新的思路,即在标定时同时进行单维加载和多维加载。之后使用上述两种方法进行解耦,对比发现,对新的方法,在使用BP神经网络的方法解耦时,将最大误差降低到了2.27%,证明该方法能够同时解决六维力传感器的维间耦合问题和多维加载问题。 相似文献
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维间耦合一直是制约多维力传感器精度提高的重要因素,结构解耦也一直是多维力传感器追求的目标。提出了一种新型三维力传感器,可用于Fx、Fz、My3个维度广义力的测量,其敏感原理是结构解耦的,因此可具有更高的精度。介绍了这种新型三维力传感器的结构并分析其敏感原理。采用有限单元法对应变式三维力传感器进行结构静力仿真,利用ANSYS后处理器提供的路径映射技术,精确地获得了应变片的贴片区域。仿真结果表明,该新型传感器与目前的应变式多维力传感器相比,维间耦合误差有明显改善,维间干扰由传统结构的3.56%降低至0.40%。 相似文献
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多维力传感器的维间耦合问题严重影响了检测精度的提高。通过设计新型RF-GA(基于遗传算法的改进随机森林算法)解耦方法解决多维力信息的解耦问题,实现提高力传感器检测精度的目标。针对随机森林算法中含有大量子树,但每个子树的预测准度无法保证的问题,利用遗传算法对随机森林的子树进行筛选,保留优质子树,从而提高预测精度。以基于应变检测的六维力传感器为实验对象,将RF-GA算法运用到实际力信息解耦中,并通过解耦实验对RF-GA算法进行验证。与现有解耦算法相比,RF-GA解耦方法具有精度高、解耦时间短的优点,实验结果表明该算法能有效提高多维力传感器的解耦精度。 相似文献
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正中国科学院合肥智能机械研究所智能机器人传感器实验室,是国家高技术研究发展计划(863计划)先进制造与自动化领域智能机器人传感技术网点实验室,以信息获取科学、人机交互临场感、多传感器信息融合与传输、运动生物力学工程和智能机器人应用为主要研究方向,开展力信息获取和感知系统、智能机器人及其关键技术、数字运动员和运动员指导系统等方面的工作。一、传感器系统及其应用本实验室围绕多维力传感器的关键技术,以研究六维力传感器的结构和信息处理为切入点,研制机器人六维腕力/指力/脚踝力传感器、多维阵列式类皮肤传感 相似文献
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This paper proposes a simple, intuitive method of analyzing and understanding the mass matrix of a mechanical system. With very little calculation, it is possible to determine four important values that describe the inertia and inertial coupling of a mechanism: the locked effective inertia, the force coupling, the free effective inertia, and the acceleration coupling. These values can be determined for a system formulated in terms of joint coordinates, but when used with systems formulated in terms of workspace coordinates, this work provides a unified method of determining important, well-established concepts such as effective mass (particularly important in the field of human-robot interaction) and dynamic isotropy (an important consideration for robotic manipulators and haptic devices). Two examples are provided which highlight the use of this method to analyze robotic manipulators. 相似文献
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《Advanced Robotics》2013,27(14):1603-1616
This paper focusses on sensor fusion in robotic manipulation: six-dimensional (6-D) force/torque signals and 6-D acceleration signals are used to extract forces and torques caused by inertia. As result, only forces and torques established by environmental contact(s) remain. Apart from an improvement of hybrid force/pose control behavior, an additional major benefit is that regular resetting/zeroing of force/torque sensors before free space/contact transitions can be omitted. All essential equations, transformations and calculations that are required for this 6-D fusion approach are derived. To highlight the meaning for practical implementations, numerous experiments with a six-joint Staeubli RX60 industrial manipulator are presented and the achieved results are discussed. 相似文献
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Many tasks assigned to a manipulator include interactions with its operating environment or manipulating objects, which are detected as forces and moments by the force sensor. It is, however, not easy to detect when a pure external wrench occurred in interactions or manipulations since signals measured by the force sensor consist of the inertial effect of the end-effector and manipulating objects as well as the effect of interactions. In order to separate these combined effects, a self-classification method for the 6-axis force sensor is proposed in this paper by relating the wrench and the virtual point mass. With the proposed method, wrenches due to the end-effector and objects can be classified in runtime without any prior information for them, and thus a pure external wrench can also be distinguished from them. The effectiveness of the proposed self-classification method is verified through experiments. 相似文献