34results about How to "Achieve long battery life" patented technology

The invention belongs to the field of aircraft design, and in particular relates to an aircraft and a control method. The invention provides a design method in which the sub-driver drives the blades of the aircraft to provide lift, and the aerodynamic efficiency is high. The blade can rotate around the installation axis and can be folded along the hinge set in the middle of the blade. After combination, it can be folded in various postures and can take off in the folded state, which can meet the requirements of vertical take-off in a narrow space. The control method proposed by the invention can meet the control requirements on the flight attitude of the aircraft proposed by the invention.

The invention discloses an intelligent UAV automatic charging system, which includes a UAV and a charging pile. The UAV includes: a low battery alarm module, a UAV communication module, a positioning module, a flight control module, and a charging docking station module; the charging pile includes: a camera module, an FPGA development board module, an XY axis servo motor module, and a wireless charging module. The invention realizes that after the UAV lands on the UAV charging pile, the image of the lower part of the platform is collected by the image acquisition system, input into the FPGA, and the characteristic signs of the lower part of the UAV are calculated and recognized by using the corresponding algorithm, and its coordinates are calculated. Control the XY axis servo motor to move the wireless charging board under the drone to realize automatic charging. It is suitable for automatic charging of various types of drones to achieve long-term battery life of drones.

The invention discloses a visual teaching display system, which includes a projector, a projection screen, a computer, a teaching pen, a camera, an ultrasonic receiver, and a computing chip. The computer receives the light point image or the position coordinate information of the teaching pen, And process the light point image to obtain the light point coordinate information; call the built-in drawing function according to the light point coordinate information or the teaching pen position coordinate information, generate the corresponding light point coordinate image or the teaching pen position coordinate image, and convert the light point coordinate The image or the position coordinate image of the teaching pen is output to the projector. The invention realizes the fusion of the multimedia teaching mode and the traditional blackboard teaching mode, and the teaching teacher can switch as desired and on demand, effectively improving the classroom efficiency. The invention adopts solar charging mode to supply energy to the core component teaching pen, and realizes long-time battery life of environmental protection. The investment cost of the invention is not high, it is suitable for all kinds of teaching institutions in the country, and has a very good application prospect.

The invention relates to the technical field of ship power, in particular to a ship propulsion system. The ship propulsion system comprises a thermoacoustic engine, a propulsion device, a heating device and a cooling device; the thermoacoustic engine comprises an acoustic pipe and a heater, a heat regenerator and a heat exchanger, wherein the heater, the heat regenerator and the heat exchanger areconnected and arranged in the acoustic pipe in sequence; the heating device is connected with the heater; the cooling device is connected with the heat exchanger; the propulsion device comprises a branch pipe; the branch pipe comprises a horizontal pipe and a vertical pipe communicating with each other; the vertical pipe and the acoustic pipe vertically communicate with each other; the water surface in the branch pipe is positioned in the vertical pipe; one end of the horizontal pipe is a water inlet; the other end of the horizontal pipe of the branch pipe is a water outlet; the water inlet faces towards a bow of a ship; and the water outlet faces towards a stern. According to the ship propulsion system, by using a heat source to drive the thermoacoustic engine, the thermoacoustic engineconverts heat energy into mechanical energy in the form of acoustic waves; through the propulsion device, the acoustic waves suck water flow from the bow direction of the ship and spray the water flowfrom the stern direction so as to push the ship to advance; and therefore, problems of multiple power conversion links and low efficiency on the current ship are solved; and noises are reduced.