39results about How to "Reduce displacement error" patented technology

A deformable mirror device capable of generating various aberrations belongs to the field of system aberration compensation of optical systems. In order to solve the problem in existing patents that the axial force, tangential moment, and Simultaneous loading of radial torque makes it difficult to control the accuracy of effective aberrations and rigid body displacement errors. The optical components of the device and the deformable mirror frame are connected into a mirror frame assembly by gluing or pressing, and multiple drivers are respectively fixed on the on the outer ring of the deformable mirror frame, and the input force acts on the driving arm of the deformable mirror frame; the deformable mirror frame is an integrated structure that connects the outer ring of the mirror frame and the inner ring of the mirror frame by a plurality of flexible blocks uniformly distributed in the circumferential direction, There is a driving arm distributed between every two adjacent flexible blocks; the driving arm is connected to the inner ring of the mirror frame, and is separated from the outer ring of the mirror frame by a wire-cut slit; the cross-section of the driving arm is in the form of a cross beam structure, and eight drivers Act respectively on the upper and lower sides of the four ends of the cross beam.

The invention provides a memory test system and a test method thereof. The memory test system includes a memory tester and a memory unit. The memory tester generates a data gating signal during testing. The memory unit detects enabling of the data gating signal during testing and outputs a test data signal having stored data to the memory tester. The memory tester judges whether the memory unit is damaged based on the test data.

The invention discloses a high-precision integrated navigation positioning method for an underwater glider. The method comprises the steps that output of an inertial measurement unit (IMU) is subjected to rough processing and fine processing; higher-precision data is obtained; data obtained by dead reckoning based on a Runge-Kutta method (RK4) is combined; adaptive Kalman filtering (AKF) and unscented Kalman filtering (UKF) are conducted; the filtered data is fed back to the IMU; an accumulative error of the IMU is corrected; and relatively accurate information such as position, speed and gesture is finally output. The autonomous navigation method for the underwater glider has the advantages of high precision, real-time performance, stability, and the like, so that a whole navigation system can stably operate at long endurance, high precision and low power consumption, the current position and gesture information of an underwater aircraft can be obtained rapidly and accurately, and navigation path and position parameters can be provided for the underwater aircraft.

The invention provides a roller-lifting proportional and synchronous hydraulic control system, relating to a perforating machine. The invention solves the problem that the traditional hydraulic control system can not control the displacement conveniently. The roller-lifting proportional and synchronous hydraulic control system comprises a proportional valve, hydraulic control one-way valves, a change valve, a pressure relay, a synchronous motor and two roller-lifting hydraulic cylinders, wherein the three hydraulic control one-way valves are respectively connected with a port p, a port a and a port b of the proportional valve, and the port a of the proportional valve is connected with the pressure relay and an oil inlet of the synchronous motor through the hydraulic control one-way valves; two oil outlets of the synchronous motor are respectively connected with piston cavities of the two roller-lifting hydraulic cylinders, and piston rod cavities of the roller-lifting hydraulic cylinders are connected in parallel and then connected with the port b of the proportional valve through the hydraulic control one-way valves; and a port b of the change valve is connected with oil control ports of the hydraulic control one-way valves, an oil return port of the change valve is connected with return oil of the system, and oil drain ports of the hydraulic control one-way valves are connected with oil return pipes of the system. The roller-lifting proportional and synchronous hydraulic control system can be used for controlling the synchronous movement of a plurality of hydraulic cylinders by using one proportional valve.

The invention belongs to the technical field of online detection of industrial tower equipment and discloses a scanning and moving device for tower fault detection. The scanning and moving device comprises a wire winding wheel, a wire distributor, a handle, a speed reducer, a pulley block, a wire winding device, a wire pressing device and a base. The scanning and moving device has the key points that the wire winding wheel is connected with the speed reducer and the handle; a steel wire rope of the wire winding wheel is positioned by a pulley block; a pulley in the pulley block, which is farthest from the wire winding wheel, is provided with a wire pressing device; a rotating shaft of the pulley is connected with a mechanical rotating counter; the wire winding wheel and the pulley block are arranged together on the base. The scanning and moving device disclosed by the invention has the advantages that the operation is simple, the distance measurement is accurate, the displacement errors are few, and the labor can be alleviated.

The invention discloses a lifting type evaporator table centering rapid testing mechanism and a testing method thereof and belongs to the field of evaporator table testing. The lifting type evaporator table centering rapid testing mechanism comprises a thickness measuring cover, a cloche, a triangular support, a fixed triangular support seat, an electron gun, a transparent offset plate and an emitting point light source adjusting device. The thickness measuring cover is arranged at the top of the cloche, and a sensor probe for testing thickness is arranged inside the thickness measuring cover; the middle of cloche is provided with the fixed triangular support seat, the outer side surface of the cloche is provided with a guide rod, the bottom of the guide rod is connected with the bottom of the cloche, and the guide rod is provided with a positioning clamp; the emitting point light source adjusting device is arranged at the crucible of the electron gun and composed of a light source device and a fixing jacket; the transparent offset plate is arranged above the triangular support or the thickness measuring cover and provided with a thickness measuring cover positioning point mark and a triangular support positioning point. The lifting type evaporator table centering rapid testing mechanism can help find errors generated during usage of equipment intuitively and avoid deviation of testing points from a central line, and accordingly, is high in accuracy, convenient and rapid.

In general, in one aspect, the invention features a method for driving a droplet ejection device having an actuator, including applying a multipulse waveform that includes two or more drive pulses to the actuator to cause the droplet ejection device to eject a single droplet of a fluid, wherein a frequency of the drive pulses is greater than a natural frequency, fj, of the droplet ejection device.

A method and a device for controlling the cantilever crossbeam of a full automatic chip mounter to perform high-precision synchronous motion along the Y axis relate to the field of chip mounter control and aim to solve the problem that in the motion process of the cantilever crossbeam of the full automatic chip mounter along the Y axis, moving speeds and displacement of two ends of the cantilever crossbeam are asynchronous. According to the method and device for controlling the cantilever crossbeam of the full automatic chip mounter to perform high-precision synchronous motion along the Y axis, signals collected by a first magnetic railing ruler and a second magnetic railing ruler are guided into a motion control module, and a pulse signal sent to a second servo driver is revised by using software in the motion control module, so the aim of compensating the pulse error of the two magnetic railing rulers to the second servo driver in a mode of amending a pulse frequency in the shortest sampling time is ensured, and the moving speeds of the two ends of the cantilever crossbeam are controlled to be same. The method and device for controlling the cantilever crossbeam of the full automatic chip mounter to perform high-precision synchronous motion along the Y axis are suitable for controlling the cantilever crossbeam of the full automatic chip mounter to move along the Y axis.

The invention provides a positioning and feeding device for solid samples, which is composed of a feeding arm and a clamping device. The feeding arm has a shaft body and a transmission shaft extending downward into the shaft body, and is respectively connected with an upper positioning clamp and a lower positioning clamp. Positioning pliers; a return spring is elastically abutted between the transmission shaft and the shaft, so that the upper end of the transmission shaft can be operated to separate the lower positioning pliers from the upper positioning pliers; the feed arm also has a The outer wall of the shaft body is non-rotatably connected to the sample injection cantilever. The shaft body can be vertically displaced relative to the sample injection cantilever, and can stay at any height position within the range of predetermined height positions; the clamping device has the ability to move horizontally and longitudinally The relative displacement of the linear guide rail and the slide block, the position of the linear guide rail is fixed, and the slide block is fixedly connected with the sample injection cantilever. The invention can accurately position and feed solid samples, has small positional errors for repeated sample feeding, can feed and take out operations in a narrow space, has small displacement errors, and is easy to install.

The invention discloses a polarizing machine, which comprises a body, a polarizer washing station, a polarizer attaching station arranged in the body, and a fan filter module arranged on the top of the body; The attached station is provided with two adsorption towers, and a polarizer placement area is formed between the two adsorption towers; one of the two adsorption towers is located at the attaching end, and the other is located at the tearing end; it is characterized in that, at the At least one auxiliary suction cup for absorbing the polarizer is provided on the inner side of the adsorption tower at the attaching end. The invention effectively prevents the displacement of the polarizer when the film is torn off, and greatly improves the production precision of the equipment. After the actual production inspection, the displacement error is reduced from the original ±0.8mm to ±0.3mm. At the same time, there are few improvements to the equipment, simple and reliable, low cost and good stability.

A method and device for accurately simulating rock core displacement under pressure in a laboratory. The main purpose is to solve the problem that the porosity of the core is easy to change during the deformation process when simulating the core displacement in the laboratory, which leads to the inaccurate data obtained. The method is summarized as follows: Calculate the reasonable displacement pressure required for displacement through empirical formulas, calculate the ring pressure and displacement pressure required to maintain porosity according to the porosity change formula, so as to keep the core porosity unchanged, And keep the ring pressure changing with the displacement pressure during the core displacement process, so that the pressure difference remains unchanged. A device with an adjustable temperature electric heating core holder is designed, and a back pressure valve is added at the outlet end of the core holder to keep a certain pressure in the holder. According to the empirical formula, a reasonable displacement pressure is obtained, and then The pressure difference between the ring pressure of the holder and the displacement pressure is kept constant through the ring pressure system to ensure that the porosity of the core remains unchanged during the deformation process.