Deployable wave energy harvesting device for autonomous underwater vehicles (AUVs)
A deployable wave energy harvesting device for autonomous underwater vehicles (AUVs) includes a deployable lifting platform and an energy harvesting mechanism. The deployable lifting platform includes two scissor-type lifting structures, which are supported by a double-end threaded rod. A first stepper motor is connected to a threaded rod passing through a threaded hole at a center of a slotted pin shaft, and drives the threaded rod to lift and lower the deployable lifting platform. A spindle on the energy harvesting mechanism is connected to a generator. A support frame is hung at the end of the spindle. A scissor-type single-pendulum structure is hung at the lower end of the support frame. A load is hung on the end of the scissor-type single-pendulum structure. Second and third stepper motors are installed on the support frame to lift and lower the load by rope drive.
1 . A deployable wave energy harvesting device for an autonomous underwater vehicle (AUV), comprising:
a deployable lifting platform; and
an energy harvesting mechanism fixedly provided on the deployable lifting platform;
wherein the deployable lifting platform comprises a scissor-type lifting structure; a double-end threaded rod is connected to the scissor-type lifting structure to support the scissor-type lifting structure; and upper and lower ends of the scissor-type lifting structure are each supported by a sheet metal part; a lower end of the deployable lifting platform is provided with a stepper motor seat; a first stepper motor is provided at a side of the stepper motor seat, and the first stepper motor is connected to a threaded rod via a first shaft coupling; the threaded rod passes through a threaded hole at a center of a slotted pin shaft; and the first stepper motor is configured to drive the threaded rod to twist, push and pull the scissor-type lifting structure to lift and lower the deployable lifting platform; and
a spindle on an upper end of the energy harvesting mechanism is mounted on a bearing, and is connected to a generator through a second shaft coupling; a support frame is hung at an end of the spindle; a scissor-type single-pendulum structure is hung at a lower end of the support frame to act as single pendulum, and an alignment structure is provided at the lower end of the support frame; a load is hung on an end of the scissor-type single-pendulum structure; a second stepper motor is provided on a first side of the support frame, and a third stepper motor is provided on a second side of the support frame; and the second stepper motor and the third stepper motor are configured to drive the load to move upward and downward by rope drive.
2 . The deployable wave energy harvesting device of claim 1 , further comprising:
a single-chip microcomputer;
a drive;
a rectifier circuit;
a control circuit;
a voltage detection module; and
a battery;
wherein the battery is configured to power the first stepper motor to drive the deployable lifting platform to move upward or downward according to sea state; the single-chip microcomputer is configured to control the second stepper motor and the third stepper motor to drive the load to move upward or downward to adjust a pendulum length of the scissor-type single-pendulum structure according to sea state; and the rectifier circuit is configured to convert irregular alternating current into direct current and collect the direct current.
3 . The deployable wave energy harvesting device of claim 2 , wherein the deployable wave energy harvesting device is installed in the autonomous underwater vehicle; when the autonomous underwater vehicle is about to run out of power, the autonomous underwater vehicle floats to sea surface, and the battery powers the deployable wave energy harvesting device; simultaneously, a hatch cover is opened, and the first stepper motor is driven to lift the deployable lifting platform; and the voltage detection module is configured to detect a voltage amplitude after rectification and feed back the voltage amplitude to the single-chip microcomputer; and when a voltage generated by the generator reaches the voltage amplitude, the battery stops supplying power to the deployable wave energy harvesting device.
4 . The deployable wave energy harvesting device of claim 1 , wherein a motor shaft of the second stepper motor is connected to a motor shaft of the third stepper motor via a third shaft coupling; when collecting electricity, the second stepper motor and the third stepper motor are controlled by a single-chip microcomputer to rotate in the same direction simultaneously to drive the load to move upward or downward by rope drive; and when power is off, a pendulum length is fixed according to a positioning torque of the second stepper motor and the third stepper motor to prevent the load from falling under the action of its gravity.