42 results about "Straight line trajectory" patented technology

The invention provides a piezoelectric actuator and a piezoelectric motor. The piezoelectric actuator comprises a piezoelectric body which is of a square platy structure and is polarized in the thickness direction. A first electrode layer is arranged on a main plane of a first end of the piezoelectric body in the thickness direction, a second electrode layer is arranged on a main plane of a second end of the piezoelectric body in the thickness direction, the first electrode layer comprises a plurality of electrode areas, and the second electrode layer comprises at least one electrode area. The piezoelectric actuator can work in a simple first-order bending vibration mode, generates reciprocating straight-line trajectory movement or elliptical orbit movement, is simple in structure and convenient to manufacture, and can solve problems which exist in a traditional piezoelectric actuator.

A method for recording and predicting position data for a self-propelled wheeled vehicle (1) carrying a load (14) is provided whereby the vehicle (1) is caused to move along a ground surface (5) along a predominantly straight line trajectory (17) by rotating at least one load carrying wheel (3) in frictional engagement with the surface (5), angular rotation data of at least one wheel (3) is obtained, absolute position data are obtained at different predetermined fixed positions P_n of the vehicle (1) with respect to the surface (5) along the straight line trajectory (17), whereby the distance travels is measured independently and used to calibrate motion sensors on board the vehicle. The invention also comprises a delivery or pick up system, a program for an on-board computing device and an on-board computing device.

The present invention relates to an AUV inversion docking control method, belonging to the technical field of underwater vehicle recovery and docking. The method is characterized in that the head of an AUV is equipped with a USBL transceiver, two sides of a recovery station is equipped with two USBL transponders B1 and B2; in the process that the AUV approaches a docking station, the AUV obtains the positions of the transponders in a body coordinate system through a USBL positioning system, time derivation is carried out by an AUV transponder position measurement equation, and a docking error is defined in the AUV body coordinate system. In the docking process, the AUV is in a full driving navigation mode, for a docking error, a nonlinear inversion controller is designed, thus the AUV navigates along an expected straight line trajectory until reaching the docking station. According to the method, the inversion adapted speed tracking has good speed tracking performance in a condition of parameter uncertainty, and the docking effect is good.

The invention discloses a method for implementing straight-line trajectory tracking of an unmanned inspection cruiser under ocean current influence, and particularly relates to the technical field ofmariculture monitoring. According to the method for implementing the straight-line trajectory tracking of the unmanned inspection cruiser under ocean current influence, an LOS (line of sight) navigation algorithm and PID (proportion integration differentiation) control are combined for meeting factory and ecological development demands of mariculture under the ocean current influence, and the problem about the straight-line trajectory tracking of the unmanned inspection cruiser is solved. The LOS navigation algorithm is applied to course control of the unmanned inspection cruiser and finishestrajectory tracking with a PID control algorithm, so that the unmanned inspection cruiser sails to a collection point to finish water quality data collection, simulation study is performed on the method with a MATLAB, and a simulation result indicates that the method has a good control effect.

A system for detecting and classifying small amounts of explosives and other controlled substances while rejecting confounders, including a source/detector array formed of a plurality of sources and a plurality of detectors, a signal processor coupled to the source/detector array for processing data received from the detectors, a classifier coupled to the signal processor for classifying data received from the signal processor according to a plurality of algorithms, a maximal rejection classifier coupled to the classifier; and a declarative decision module coupled to the maximal rejection classifier for rendering an accurate decision regarding the contents of the object is provided. The apparatus includes an enclosure, a shield layer disposed within the enclosure, a cavity disposed within the shield layer, a plurality of neutron sources and a detection array disposed within the cavity, and a transport mechanism for moving objects through the cavity past the sources and detection array. The cavity has one or more turns which preclude a straight line trajectory through the cavity. The shield layer is water-filled to prevent stray radiation from exiting the enclosure. The use of multiple lower power neutron sources and the particular geometry of the enclosure provide a compact, relatively lightweight explosive detection system which is practical for use in airports and other public locations.

The invention discloses a method of air coarse alignment based on a straight-line trajectory. The method of the air coarse alignment based on the straight-line trajectory comprises the steps that an air coarse alignment triggering condition is established; after real-time speed of an unmanned aerial vehicle meets the air coarse alignment triggering condition, the unmanned aerial vehicle is required to navigate in a straight line, real-time trajectory angle information is obtained; and an effective sampling point is judged to calculate a level attitude angle by using a reliability assessment index of the straight-line trajectory, and coarse alignment is completed. According to the method of the air coarse alignment based on the straight-line trajectory, the problem that initial alignment ofa ship-borne unmanned aerial vehicle inertial navigation system is affected by sea wave fluctuating is solved, and the lifting, takeoff and straight-line operation process of the unmanned aerial vehicle are distinguished through speed threshold isolation; rest time before takeoff required for the alignment of the ship-borne unmanned aerial vehicle inertial navigation system is reduced, the alignment of initial attitude is completed by using an aircraft accelerated straight-line flight process, and the flight efficiency is well improved.

The invention discloses a method for improving the thickness uniformity of an automatic spraying coating, and belongs to the technical field of robot spraying. The method is characterized by comprising the following steps that a, the spraying width of a spraying gun of a spraying robot is set to be L, and one spraying width is overlapped for N times; b, spraying program writing is performed for a part; c, a first 1/4 arc is inserted, and meanwhile, a gun opening instruction is set at the end point of the arc; then a second 1/4 arc is inserted; a straight line track is inserted again, the straight line track is parallel to the previous straight line track, and the starting point of the straight line is not provided with a gun opening and closing instruction; the operation is performed until the rest program tracks are written; and d, the program tracks are guided into the spraying robot, the part is located in a spraying area, paint is added, the spraying robot starts a program, and spraying is completed. For the concave or narrow complex part, all curved surfaces can be continuously sprayed at a time, the thickness uniformity of the coatings of the left overlapping area and the right overlapping area of the part is effectively guaranteed, and the spraying efficiency is improved.

Described herein is a method and apparatus for driving a drop ejection device to produce drops having straight trajectories. In one embodiment, a method for driving a drop ejection device having an actuator includes building a drop of a fluid with at least one drive pulse by applying a multi- pulse waveform having the at least one drive pulse and a straightening pulse to the actuator. Next, the method includes causing the drop ejection device to eject the drop with a straight trajectory in response to the pulses of the multi-pulse waveform. The straightening pulse is designed to ensure that the drop is ejected without a drop trajectory error.

The invention relates to a distance measurement trolley with a linear track monitoring function. A left early-warning lamp and a right early-warning lamp are arranged at two ends of a front wheel bracket respectively, a guide block is horizontally arranged on a distance measurement wheel connection member, a left projection and a right projection are horizontally arranged in the middle of a block, the guide block abuts to the middle of the block and is located between the left projection and the right projection, a left electric contact piece is arranged on the left projection, a right electric contact piece is arranged on the right projection, an electric contact block is disposed in the middle of the guide block, the left electric contact piece is connected with the right early-warning lamp through a wire, the right electric contact piece is connected with the left early-warning lamp through a wire, and the electric contact block is connected with a battery through a wire to be respectively connected with the left early-warning lamp and the right early-warning lamp. Compared with distance measurement trolleys in the prior art, the distance measurement trolley has the advantages that the defect that pushing distance measurement of the distance measurement trolleys cannot guarantee linear tracks is overcome; linear pushing of the distance measurement trolley in the process of pushing distance measurement can be real-timely monitored, and accuracy of distance measurement is improved.

The invention relates to an accurate design method for a space envelope forming envelope die under a linear track. The accurate design method comprises the following steps: S1, establishing a rectangular coordinate system; S2, determining an envelope axis; in the xoy plane, selecting a straight line passing through a point O as an envelope axis, wherein the envelope axis cannot penetrate through the upper surface of the component, and the included angle between the envelope axis and the x axis is theta; S3, enabling the envelope axis determined in the step S2 to serve as a boundary, dividing the upper surface of the component into a left area and a right area, wherein the coordinate of any point on the upper surface of the component is (x, y, z); and S4, selecting any point M (Mx, My, Mz)of the right area, mapping the point M upwards and anticlockwise around the envelope axis, to ensure that the distances from the point M and the mapping point to the envelope axis are equal, so that the mapping point M '(M'x, M'y, M'z) is any point on the right area of an envelope mold. the enveloping mold needed in the linear track enveloping forming process of the workpiece can be obtained, andthe design precision of the enveloping die is improved.