Traditional heavy and complex control equipment such as remote controllers (RCs) and ground stations (GSs) are not able to meet the fast and flexible control requirements of unmanned aerial vehicles (UAVs) in complex environments. This article thus proposes a gesture recognition method for the control of UAVs. To achieve the goal of gestural manipulation of UAVs, this method can accurately recognize a variety of gestures and convert the gestures into corresponding UAV control commands. First, the wireless data glove incorporates flex sensors, and inertial sensors are used to gather gesture datasets. The trained neural network model is then deployed on the data glove based on an STM32 microcontroller for real-time gesture recognition, in which the backpropagation (BP) network is used for static gesture recognition and the bidirectional gated recurrent unit (Bi-GRU) network is used for dynamic gesture recognition. Finally, the gesture is converted into the control command and sent to the aircraft terminal to control the UAV. Using the UAV simulation test on the simulation platform, the recognition accuracy of the basic UAV control commands corresponding to ten static gestures is found to be 100%, and the mean recognition accuracy of the UAV mode-switching commands corresponding to five dynamic gestures is 98.4% indicating that the gesture recognition effect of the system is perfect. Mission testing performed in the scene constructed in the simulation environment demonstrates that the UAV can respond rapidly to gestures, and the method proposed in this article can achieve real-time and stable control of the UAV on the end side.

漏电断路器作为低压配电系统中重要的保护装置,主要用于防止漏电火灾事故发生和保护人身触电安全.电磁式漏电断路器在受到外界磁场干扰时,会引起漏电保护工作特性的变化甚至损坏.通过分析电磁式漏电断路器工作特性,发现磁脱扣器对外界磁场最为敏感,平行于磁脱扣器磁路平面方向的外界磁场对其影响最大;进行了漏电断路器内部导体结构的最优设计,内部导体与磁脱扣器磁路在同一平面内时导体中负荷电流产生的磁场对磁脱扣器的影响最小;设计了一种用于降低磁场干扰的磁脱扣器屏蔽罩,并分析了不同导磁屏蔽材料及结构等对其屏蔽效果的影响.通过对电磁式漏电断路器内走线的优化设计和磁脱扣器的磁屏蔽设计,有效降低了外界磁场和内部负荷电流对电磁式漏电断路器的影响,提高了其抗空间磁场干扰的能力,并通过了实验验证.

The impact of tolerance on magnetic performance of magnetic release is researched in this paper. The main influencing factors of magnetic performance are analyzed by magnetic circuit method, including contact area between yoke and armature, yoke thickness and yoke notch size. And an orthogonal test is established to find optimal parameter combination. The obtained conclusions can provide guidance for the design and optimization of magnetic release.

The magnetic release is a core component of a voltage-independent residual current device (RCD). Due to the sensitivity of magnetic release, it is easy to be interfered with by an external magnetic field. A new magnetic release design with high anti-interference capability is proposed in this work. First, the impact of the interference magnetic field on the magnetic release is analyzed. Second, the proposed magnetic release is detailed illustrated, including the structure and parameter design. Finally, several main factors influencing the anti-interference ability of magnetic release are analyzed, including the right torque arm and right contact area. Both simulation and experimental tests are carried out to verify the effectiveness and superiority of the proposed magnetic release.