42results about How to "High deformation accuracy" patented technology

The invention discloses a martensite steel 3D free-bending forming device and method and belongs to the technical field of advanced manufacturing and plastic forming. Firstly, based on relative parameters of the forming performance of a pipe material, a corresponding correction factor of the material is obtained through repeated iterative calculation, and an initial model is corrected; after the using situations of parts are tested and calibrated, a three-stage type induction heating device and sensors are matched to achieve precise temperature-control heating; the three-dimensional space of abending mould rotates to extrude the front end of the pipe material to enable the front end of the pipe material to be in a bent shape with the complicated space; and the quenching process is conducted through an annular water-cooling spraying head and accordingly is rapid and uniform. The martensite steel 3D free-bending forming technical problem is solved, and high-temperature free-bending forming under the three-dimensional space is achieved; by means of a rapid quenching system, the strength of 1400 MPa or above is obtained, formation coordinated control of an ultrahigh-strength steel 3Dfree-bending member is achieved; and thus the martensite steel 3D free-bending forming device and method have important engineering application value in the fields of aerospace, rail transportation, automobiles and nuclear power.

A multi-point-contact flexible bearing for a harmonic reducer comprises a three-point-contact flexible ball bearing, a four-point-contact flexible ball bearing and a line-contact flexible roller bearing; a single rolling body and an outer ring raceway, namely, an outer ring-flexible gear interference-fit piece have two or more contact points; compared with the prior art that only one contact point exists, the multi-point-contact flexible bearing has the quality and technological advantages that the given deformation precision of the outer ring-flexible gear interference-fit piece and the meshing precision of flexible gear teeth with rigid gear teeth are improved, unnecessary additional deformation is reduced and even avoided, the contact stress of the rolling body with the raceway is reduced, sliding of the rolling body is controlled, assembling conditions and lubricating conditions of the bearing during operation are improved, and the like; and finally, the running precision and the service life of the flexible bearing, a flexible gear and even the whole harmonic reducer are improved and prolonged, and the bearing has very important actual engineering significance.

The invention belongs to a forming technology for a resin matrix composite material preform, and specifically relates to a forming device and method for a twisted variable-thickness composite materialstructure. Due to insufficient machining accuracy for a preform and a limit of a weaving process, a difference exists between the thickness of the weaved preform of a blade and a theoretical thickness of the blade, and the phenomena of secondary bonding and compaction with a molded surface, of the preform, exist in a die assembly process. The forming device for the twisted variable-thickness composite material structure comprises a base, a transversal press block and a longitudinal block, wherein the upper surface of the base is the same as the lower surface of the twisted preform, the combined lower surface of the transversal press block and the longitudinal block is the same as the upper surface of the twisted preform, and accurate deformation control over the variable-thickness preformof the blade from a planar state to a twisted state is realized, so that the deformation accuracy is remarkably increased, and the deformation process is controllable; and the problem of local extrusion or slide deformation which is brought by simultaneous compression of preforms in areas with different thicknesses, is avoided.

The invention discloses a concrete temperature stress testing machine achieving mold separable vibrating. The testing machine comprises a main testing machine body, a concrete sample mold detachably connected with the main testing machine body, and a deformation measurement device. According to the concrete temperature stress testing machine achieving mold separable vibrating, mounting and demounting of the concrete sample mold and the main testing machine body are convenient, the concrete sample mold can be independently poured and vibrated after being demounted, the concrete sample mold is mounted on the main testing machine body for relevant temperature stress testing after the vibrating quality requirement is met, the pouring quality of concrete is greatly improved, and the credibility and comparability of the test result are better.

A multiple contact-point flexible bearing applicable to harmonic drive has three contact-point flexible ball bearing, four contact-point flexible ball bearing and line contact flexible roller bearing. Single rolling element has two or two more contact points with the outer ring raceway, i.e. outer ring—flexspline interference fit component. Deformation accuracy of outer ring—flexspline interference fit component and teeth meshing accuracy of flexible and rigid wheels are improved so unnecessary additional deformation is reduced and even avoided. Contact stress between rolling element and raceway is reduced. Slip of rolling element is controlled. Quality and technical advantages such as bearing assembly conditions and lubrication conditions in operation are enhanced. Eventually, operating accuracy and service life of the flexible bearing, flexspline even the whole harmonic drive are improved, which means a lot in practical engineering.

The invention provides a flexible leading edge structure. The structure comprises a flexible structure which is used for forming an aerodynamic configuration of a wing leading edge, and driving structures which are arranged in the flexible structure in a distributed mode and can generate driving force under excitation of excitation signals, wherein the driving force acts on the flexible structureto change the aerodynamic configuration of the flexible structure. Compared with an existing variable camber wing leading edge device, the flexible leading edge structure is advantaged in that on onehand, true integration of the structure and functions can be achieved, the driving structure can serve as a driver and can further serve as a bearing structure, structural complexity can be effectively reduced, the weight can be reduced, and comprehensive performance of an airplane can be improved; on the other hand, deformation precision can be improved through the multiple driving mechanisms arranged in a distributed mode, deformation control over the multiple target configurations can be further achieved, and real-time optimization of the front edge configuration is truly achieved.

The invention discloses a K-band radar-based track non-contact deformation high-precision measurement method. The method comprises the following steps of: fully utilizing a means of combining K-band radar absolute distance measurement and phase detection to respectively determine the distance from a K-band radar to a steel rail and the displacement deformation of the steel rail, measuring the distance s from the radar to the steel rail according to the delay between electromagnetic wave emission and electromagnetic wave reception of the radar, then monitoring the phase change of the received electromagnetic wave to obtain the real-time change of the monitored steel rail and the micro-deformation from the steel rail to the center point of the radar, and then obtaining the micro-deformationof a track by calculating the horizontal and vertical components of the micro-deformation of the steel rail and the center point of the radar. According to the method, all-weather track deformation monitoring is achieved, steel rails of different tracks can be automatically distinguished for a plurality of railway track concentration areas, the high-precision measurement characteristic and the portability characteristic of the K-band radar are fully utilized, and the measurement precision of track deformation monitoring is improved.

The invention relates to a passive bending and axial rotating mechanism based on cross reeds with variable cross sections. The whole multistage passive bending and axial rotating mechanism consists ofa plurality of cross reed units of different sizes and types, cambered free ends are adopted for units bearing passive bending, and the cross points of the cross reeds are overlapped with the cross reed units relative to the circle center of the free end on the outer side of the whole bending mechanism, so that the offset of the cross point of each cross reed unit is reduced when each cross reedunit is subjected to passive bending deformation, and the deformation precision of each cross reed unit is higher. The cross reeds adopt the cross reed units with the variable cross sections, and thecross section of each reed is thinnest at the corresponding cross point and thickest at the portion connected with the free end, so that the large passive deformation is realized under the condition of ensuring the deformation precision. The mechanism has the advantages of high precision, no friction, no lag, no wear, no stiction, no lubrication and the like.

The invention discloses a method and a system for training a heart motion field estimation model and a method and a system for heart motion field estimation. According to the method and the system fortraining a heart motion field estimation model, a semi-auto-encoder network is used to extract multi-scale features of the left ventricle in a Cine MR images at the end of diastole and the end of systole, different scale features are fused through an encoding network so as to decide distribution parameters of deformation parameters of control points, a deformation model of a radial basis functionis introduced into an auto-encoder, and a decoding process is not needed in an auto-encoder network structure, so that the network is lightened. The non-uniformly distributed control points are adopted, so that the deformation field of the area where the left ventricle is located is easier to control, and the deformation precision is higher; and meanwhile, invisible variable parameters have definite physical significance, the smoothness of a deformation field is easier to control, and a more stable and reasonable heart movement field is obtained to be used for quantitative analysis of cardiovascular diseases.

The invention discloses an abraded bearing position repairing device, relates to the bearing abrasion repairing technology field, and especially relates to the abraded bearing position repairing device. The device comprises a bearing installation position, an upper abrasion bearing position, a lower abrasion bearing position, an upper injection hole, a lower injection hole, a grinding tool shell,a repairing layer for an abrasion position, a bolt hole, a positioning hole and a filling portion. The bearing installation position is located in the grinding tool shell, the upper abrasion bearing position is arranged on an upper side of the bearing installation position, the lower abrasion bearing position is arranged on the lower side of the bearing installation position, and the repairing layer for the abrasion position is arranged above the upper abrasion bearing position. After the technical scheme is adopted, the device has advantages that equipment does not need to be disassembled, repair welding is not needed, and disassembling, hoisting and transportation of the equipment can be avoided; machining cost is reduced, and time is shortened; a grinding tool is adopted for forming, heat is not generated, there is no deformation, precision is high, and abrasion resistance is good; and a new shaft does not need to be replaced and cost is low.

The invention relates to a passive bending axial rotation mechanism based on cambered surface free ends and three-reed crossed reeds. The whole multi-stage passive bending and axial rotation mechanismconsists of a plurality of crossed reed units with different sizes and varieties; and the structure of single crossed reed consists of two cambered surface free ends and the crossed reeds connected with the cambered surface free ends. Three reeds, the angle between two of which is 120 degrees, are crossed to form each crossed reed in charge of axial rotation deformation; the two ends of the reedare connected with the free ends; and when forming the passive bending and axial rotation mechanism, the reed units are connected by the corresponding free ends to form the multi-stage crossed reed structure. The passive bending axial rotation mechanism has the advantages of high precision, no friction, no hysteresis, no abrasion, no stiction, free of lubrication and the like, and can replace manysimilar passive deformation structures in the practical engineering application aspect.

The invention relates to a multi-stage passive bending mechanism based on variable cross-section cross reeds. The two equal-length variable cross-section reeds are symmetrically connected with two adjacent curved face free ends in a staggered manner in the length direction to form the first stage, and the cross section of each reed is thinnest at the crossed point and is thickest at the position connected with the corresponding free end. According to the curved face free ends in the scheme, the crossed points of the cross reeds and cross reed units are overlapped with respect to the circle center of the free end of the outer side of an entire bending mechanism, so that when each cross reed unit is passively bent and deformed, the offset of each intersection is reduced, and the deformationaccuracy is higher. The variable cross-section cross reed units are adopted, that is, the cross section of each reed is thinnest at the intersection and is thickest at the portion connected to the corresponding free end, so that greater passive deformation is achieved under the condition that deformation accuracy is ensured, and the deformation accuracy of the cross reed units in the scheme is higher under the same deformation degree.