32results about How to "Reduce the difficulty of correction" patented technology

The invention discloses an automatic parallel parking path planning method based on two sections of second-order Bezier curves. The method comprises the steps of obtaining target parking space information to determine a parking target position and establishing a global coordinate system by taking the parking target position as an original point; constructing a parking trajectory segmentation judgment model to determine the number of planned trajectory segments, planning the end position range of the first section of trajectory, determining the start point, the end point and the control point of each section of planned trajectory, performing path planning by using a second-order Bezier curve, performing monitoring at set intervals, and adjusting the planned trajectory by using a dynamic adjustment planning trajectory method. According to the method, the requirement for the initial pose of the to-be-parked vehicle is lowered, and the environmental adaptability of the path planning methodis improved; the vehicle can be driven into the planned area manually through simple adjustment, so that the cost is reduced, and the method can be applied to medium and low-grade vehicles; control points of parking trajectory planning are easy to determine, a trajectory generation algorithm is simple, and the path curvature is continuous. The correction difficulty of the track error is reduced,and the obstacle avoidance performance and parking efficiency of the vehicle are improved.

The invention relates to a rock mass pile foundation pore-forming preboring construction method, including: five hole sites are arranged at a drilled pile site, a center hole sit is arranged in the center of the drilled pile site, four surrounding hole sites are evenly distributed outside the center hole site, the distance between the center of each surrounding hole and the margin of the drilled hole site is equal, and an in-the-hole drill with a drill model number of Phi 140mm is used for drilling on the center hole site and the surrounding hole site. Another hole distribution mode includes: three hole sites are arranged at the drilled pile site, the distance between the center of each hole site and the center of the drilled hole pile site is equal and the connection lines of two adjacent hole site and the center form a 120 degrees angle, the distance between the center of the hole site and the margin of the drilled hole pile site is equal, and an in-the-hole drill with the model number of Phi 220mm is used for punching on the hole site. The method of the invention realizes that pore-forming efficiency of a punching drill is high, slant rock correction difficulty is reduced, construction quality is high, construction period is short and construction cost is low when rock bearing capacity at the foundation pile site of a bridge pile is more than 1000kPa or a slant rock is existed.

The invention discloses a bar code inclination correction method based on multi-task target detection, and the method comprises the steps: building a single-stage target detector which comprises a feature extraction basic network and a detection head network which are connected in sequence; inputting the bar code image into the feature extraction basic network, and extracting to obtain a feature map; and inputting the feature map into a detection head network, and carrying out classification and position regression on the feature map to obtain a correction result. According to the method, theinclination degree of the bar code is firstly classified, then angle regression is carried out, the bar code correction difficulty is effectively reduced, the bar code is fused with a single-stage target detector to form a multi-task target detection model, the detection and correction efficiency is improved in parallel, and the decoding accuracy and speed are well improved.

The invention discloses a double-sound-track ultrasonic heat meter. The ultrasonic heat meter comprises a tube body, four installing ports are formed in the wall of the tube body, an ultrasonic transducer is installed on each installing port, the four ultrasonic transducers are arranged opposite in pairs, each two opposite ultrasonic transducers form a sound track, the two sound tracks with axes mutually parallel and lengths equal are symmetrically distributed on the two sides of the axis of the tube body, and the distances between the axes of the two sound tracks and the axis of the tube body are equal. In this way, the ultrasonic transducers are basically arranged in the positions where a flow field velocity is very close to mean flow velocity of the water velocity on the cross section in a tube, correction difficulty of measurement errors by a computer matched with a flowmeter can be greatly reduced, and therefore a final measurement result is accurate.

The invention discloses a manual l jacking pipe control method and control system. Two laser detection pipes are symmetrically arranged in the wall of each cement concrete pipe, a PSD sensor is arranged at the position, on the front end of a jacking pipe, in each laser detection pipe of each cement concrete pipe, a computer connected with the PSD sensors are arranged outside each cement concrete pipe, and laser emitters are arranged at the position, on the outer end of the jacking pipe, in the laser detection pipes of one cement concrete pipe, laser emitted by the laser emitters is irradiatedon the PSD sensors to form light spots, the PSD sensors collect and record information of light spot position changes, and the computer analyzes collected data, the straightness error of the cement concrete pipes can be evaluated. Through manual adjusting of a jack, the jacking direction of the cement concrete pipes can be adjusted; in the manual jacking pipe construction process, the extension deviation of a pipeline underground can be corrected, the jacking direction is effectively controlled, a deviation correcting control system and a jacking device are integrated, safety is improved, thedifficulty of pipeline deviation correcting in the pipeline jacking process can be effectively reduced, and the comprehensive cost is reduced.

The invention relates to a shield large-gradient launching construction method. The shield large-gradient launching construction method comprises the following steps that a portal steel ring is provided, and the portal steel ring is pre-buried in the side wall of a working well according to the design axis of a shield tunnel; a launching frame is provided, the provided launching frame is providedwith an inclined receiving plate, and the launching frame is annularly arranged above the bottom of the working well corresponding to the portal steel ring; a reaction frame is provided, the side, close to the launching frame and away from the portal steel ring, of the reaction frame is arranged above the bottom of the working well, and the reaction frame is perpendicular to the launching frame; and a shield tunneling machine is provided, the shield tunneling machine is hoisted to the receiving plate, and the shield tunneling machine is moved into the portal steel ring and tunneled into the soil body. When the shield tunneling machine enters the soil body, the center line of the shield tunneling machine can be closer to the inclined design axis, so that the center line of the shield tunneling machine is close to the design axis of a shield tunnel, and the deviation rectifying difficulty of the shield tunneling machine is greatly reduced.

The invention provides a phase-controllable double-channel direction finding device. The device comprises a first radio frequency control unit, a first variable-frequency amplification unit, a first variable gain amplifier, a first sampling unit, a digital control and data storage unit, a second radio frequency control unit, a second variable-frequency amplification unit, a second variable gain amplifier and a second sampling unit. According to the method for eliminating the channel phase error through the phase-controllable dual-channel direction finding device, the phase change between channels can be corrected in dual-channel direction finding, and extra errors brought to a direction finding system due to the difference of channel responses are eliminated. The invention also provides a phase-controllable dual-channel direction finding method. Compared with the prior art, the phase-controllable dual-channel direction finding device and the phase-controllable dual-channel direction finding method are high in direction finding accuracy.

The invention discloses a gynecological nursing device with a pelvic floor correction function. The device comprises a trunk plate and a lower limb plate, wherein supports are connected to the bottom of the trunk plate and the bottom of the lower limb plate; a hip pad is movably connected between the trunk plate and the lower limb plate; armrests are connected to the left side and the right side of the trunk plate; a headrest is connected to the upper surface of the trunk plate; a protective cover is connected to the surface of the lower limb plate; a lower limb support is elastically connected inside the protective cover; two traction rope through grooves are formed in the surface of the protective cover; a traction rope is connected to the lower limb support; and a pull ring is connected to the bottom of the traction rope. The lower limb support which can be controlled by the traction rope is additionally arranged, so that the body of a user can be assisted to turn on one side, and the correction difficulty is reduced.

The invention provides a rolling type low-temperature correction device of F-shaped steel. The correction device comprises an upper correction portion, a lower correction portion and a tail flange correction portion. The upper correction portion is used for correcting a web and a second leg flange of the F-shaped door frame channel steel. The lower correction portion is located below the upper correction portion and is used for correcting the web and a first leg flange of the F-shaped door frame channel steel. The lower correction portion comprises a lower frame, a sleeve and lower correctionrollers. The tail flange correction portion is connected to the lower correction portion and is used for correcting a tail flange of the F-shaped door frame channel steel. According to the rolling type low-temperature correction device of the F-shaped steel, space matched with the F-shaped door frame channel steel is formed by upper correction rollers, upper flange rollers, lower flange rollers, side correction rollers and the lower correction rollers, the F-shaped channel steel is driven by the lower correction roller to smoothly slide forwards, and meanwhile the web, the tail flange, the first leg flange and the second leg flange are corrected.

The invention provides a B-type gantry steel channel rolling type low-temperature correcting device. The correcting device comprises an upper correcting portion for correcting a flange and a supporting flange of a B-type gantry steel channel, a lower correcting portion located below the upper correcting portion and used for correcting the flange and the supporting flange of the B-type gantry steelchannel and a side correcting portion connected to the lower correcting portion and used for correcting a web plate and the supporting flange of the B-type gantry steel channel. The upper correctingportion includes an upper frame, an upper correcting roller and a flange upper roller; the upper correcting roller and the flange upper roller are both disposed on the upper frame; the flange upper roller is located on the lower side of the upper correcting roller; and the side correction portion includes a base and a side correcting roller, the base is disposed on a lower frame, and the side correcting roller is disposed on the base. The B-type gantry steel channel rolling type low-temperature correcting device can correct the web plate, the flange and the supporting flange of the B-type steel channel while the B-type steel channel is driven by a lower correcting roller to slide smoothly forward.

A preparation method of an irregular gear with an annular groove comprises the following steps that S1, a certain amount of powder metallurgy raw materials for preparing the gear are loaded into a mold; s2, after the powder metallurgy raw materials in the mold are pressed into the needed shape and compactness, demolding is conducted, and a green body is obtained; s3, the annular gasket is clamped in the annular groove of the green body, then the green body and the gasket are sent into a sintering furnace together to be sintered, and after the sintering process is finished, the gear with the gasket is taken out; and S4, the gasket is taken out of the annular groove, whether the sawtooth part, close to the annular groove, of the gear is warped or not is observed, if the sawtooth part, close to the annular groove, of the gear is warped, a correction mold is used for correction till the warped part disappears, the gear is taken out of the correction mold, and a final product is obtained. The problem that the sawtooth part close to the annular groove inclines inwards in the preparation process of the gear can be effectively solved, and the method is simple, convenient to operate and low in cost.