55 results about "Deformation theory" patented technology

The invention discloses a method for establishing a constitutive model for aluminum alloy thermal elastoplastic deformation simulation. The method comprises the following steps: (1) selecting the constitutive model; (2) determining model parameters; and (3) substituting the parameters into a constitutive model equation, and determining the constitutive model equation. The method has the advantages that the establishment of the constitutive model fills up the blank of simulating a relationship between the mechanical performance and temperature of a material used in machining of a 7A52 aluminum alloy heat machine with a numerical simulation method all the time, improves the accuracy of 7A52 aluminum alloy thermal elastoplastic deformation simulation, lays an important basis for confirming a 7A52 aluminum alloy hot working process and studying a metal plastic deformation theory, and has an important significance for practical application of 7A52 aluminum alloy.

The invention relates to a fillet weld welding structure for K-type grooves of a moderately-thick plate without back chipping and a welding technology of the fillet weld welding structure. The fillet weld welding structure is characterized in that symmetric grooves are formed in the two sides of a web plate, the web plate and a bottom plate are tightly attached when assembled in welding, and no gap is reserved when the web plate and the bottom plate are assembled; the grooves of the web plate are machined through a milling machine, no truncated edge is reserved, and the length parts between the two ends in the grooves are fixed at equal diversion points and polished; a welding robot is used for stably welding a welding bead at the position of ship-type welding, welding is carried out alternatively on the two sides in a multi-layer and multi-run manner, back chipping is not carried out on the back face, and slag is not removed in the bead; and the backward deformation theory is utilized in the assembling process, and double-face alternating welding is adopted in the welding process to restrain deformation. By means of the technology, full penetration of the fillet weld below the K-type grooves of the moderately-thick plate is ensured, and the welding quality is improved; and meanwhile, the welding automation degree and the production efficiency are obviously improved, and the welding construction environment is improved.

The invention discloses a flexible limit support device for a large-caliber light reflecting mirror and an installation method for the device. The device mainly comprises a floating support device, a flexible support structure, a gear transmission mechanism and a pressure sensing device. The specific support method comprises the following steps of: performing optimization analysis on the position and caliber of each flexible limit support disc and support reaction applied to each support surface on the surface of the large-caliber light reflecting mirror under the action of gravity and the pressure of a grinding disc based on a thin round plate deformation theory; putting a workpiece on a Whiffletree structural model transition support disc, and positioning the workpiece; rotating a worm wheel and worm transmission mechanism, and lifting each flexible support disc; and positioning each support disc in real time by using the pressure sensing device based on the support reaction calculated by a finite element. The error correction effect is good, the influence of external thermal gradient change is eliminated, and the requirements of the active grinding disc machining, detection and application processes of the large-caliber light reflecting mirror can be met.

The invention discloses a method for determining a power transmission line reinforcing scheme by comprehensive fault rate and economic efficiency evaluation. The method includes adopting the general extreme value theory to model historical ice coating data of an area to obtain probability of ice disasters of the area with specific ice coating thickness; establishing a circuit fault rate function based on physical stress analysis of power transmission lines according to the metal deformation theory, and establishing a fuzzy fault rate model of the lines by virtue of fuzzy offline rate; comprehensively considering the probability of the ice disasters in the area with the specific ice coating thickness and the fuzzy fault rate of the lines in the area to obtain comprehensive fault rate of the lines; calculating differential 'detraction' benefits by means of the comprehensive fault rate, establishing an economic efficiency evaluation index system of differential planning on this basis, and determining the sectional reinforcing scheme of the lines. The method for determining the power transmission line reinforcing scheme by the comprehensive fault rate plays an important role in guiding workout of the line-difference sectional reinforcing scheme in the differential planning and has great significance in improving anti-disaster ability of the power grid.

The invention discloses a cable simulation device and a cable simulation method in a ship mooring physical model test. The cable simulation device comprises a box body, wherein tracks, spring systems, as well as a fixed plate and a tension plate which are horizontally arranged in parallel up and down, are arranged inside the box body; the tension plate can slide up and down along the tracks; the spring systems comprise a plurality of springs and connection pull rods which are different in lengths; the cable simulation method comprises the following steps: according to stress deformation characteristics of a cable to be simulated, the length of each spring and the length of each pull rod are calculated and determined, so as to constitute the spring systems and to keep connection with the tension plate; graded pulling forces are exerted; corresponding elongation of the tension plate is measured; through the spring systems with various lengths, nonlinear tension-elongation relation of the cable is simulated and the tension-elongation relation curves are drawn; the tension-elongation relation curves are compared with the stress deformation theoretical curves of the simulated cable; errors of the test results are checked. The cable simulation device provided by the invention solves technical problem of nonlinear load and deformation relation simulation of the cable in a ship mooring physical model test; the operability is good; the accuracy and the efficiency are high; the experimental effects are favorable.

The invention relates to a pavement deflection measuring system and a pavement deflection measuring method. The system comprises speed sensors, angular speed sensors, an acceleration meter, a mileage encoder and a processor, wherein a plurality of speed sensors are respectively arranged on load cross beams in different distance away from a load origin and used for measuring the changed speeds of the load cross beams where the speed sensors are positioned in the longitudinal direction; the angular speed sensors are used for measuring the rotating amplitude variations of the load cross beams; the acceleration meter is used for measuring the pitch acceleration value of a measuring vehicle; and the mileage encoder is used for recording the running mileage information of the deflection measuring vehicle. The measuring method comprises the following steps of: measuring the pavement deflection speeds of multiple points of a pavement by adopting the plurality of co-beam speed sensors, and calculating the dynamic deflection value of the pavement according to the elastic deformation theory of the pavement and model inversion. The system and the method are suitable for continuous sampling and measuring under dynamic conditions, are used for quickly and efficiently measuring the deflection value, saves manpower and material resources, and are more accurate and reliable in comprehensive estimation of road sections.

The invention discloses a method for computing the bending rigidity of a disc and drum combination interface of a rotor of an aero-engine, and belongs to the field of structural mechanics for determining the rigidity of combination interfaces. The method includes particular steps of 1), performing equivalence on external bending moment; 2), analyzing stress on drums; 3), deriving an analytical expression for deflection angles of connecting rings of the drums under the effect of the bending moment by the aid of an elastic deformation theory; 4), determining values of contact parameters in the expression for the deflection angles psi1 on the basis of nonlinear finite element simulation analysis; 5), deriving a relative rotation angle of the disc and drum combination interface from the deflection angles of the connecting rings of the drums and further acquiring an analytical expression for the bending rigidity of the disc and drum combination interface. The method for computing the bending rigidity of the disc and drum combination interface of the rotor of the aero-engine has the advantages that the bending rigidity of the disc and drum combination interface is computed in an analytical manner, and accordingly influence of structural parameters of the disc and drum combination interface, pre-tightening force and the external bending moment on the disc and drum connection rigidity can be visually reflected; contact-related parameters in the analytical expressions are acquired by means of nonlinear finite element analysis, so that the computed bending rigidity of the disc and drum combination interface is close to actual conditions.

The invention discloses a method for calculating working performance of static-pressure sliding seats on the basis of a fluid-solid coupling effect. The method comprises the following steps of: (1) analyzing stress condition of a static-pressure sliding seat according to an actual working condition, and establishing a sliding seat stress analysis sketch map; (2) simplifying the sliding seat to a thin plate model and an oil pad model according to a thin plate deformation theory and a basic structure size of the static-pressure sliding seat; (3) calculating pressure distribution and oil film thickness change of the static-pressure sliding seat oil pad model, and establishing an equation; (4) calculating deformation condition of the static-pressure sliding seat thin plate model under the action of external force, and obtaining a deflection function of the static-pressure sliding seat thin plate model; (5) establishing a sliding seat-oil pad fluid-solid coupling model through a mutual coupling relationship between sliding seat deformation and the oil film thickness change, and establishing a dynamic balance equation of the sliding seat-oil pad fluid-solid coupling model; and (6) dynamically analyzing the working performance of the static-pressure sliding seat under the actual working condition by utilizing matlab software so as to finally obtain fluid-solid coupling effect-based working performance valuation of the static-pressure sliding seat under the actual working condition.

The invention relates to a method for determining the creep parameter of a material by a fixed straight bar small specimen creep test. The method comprises the following steps: (1) acquiring a fixed straight bar small specimen creep displacement time curve of the material; (2) determining critical displacements of small and large deformation of a specimen; (3) dividing deformation stages on the creep displacement time curve to determine the deformation stage of steady-state creep; (4) when the steady-state creep appears in a small deformation stage, analyzing a creep displacement curve of thesmall deformation stage according to a beam bending theory to obtain the creep deformation parameter of the material; (5) when the steady-state creep appears in a large deformation stage, analyzing acreep displacement curve in the large deformation stage according to a global deformation theory to obtain the creep deformation parameter of the material. By analyzing the fixed straight bar small specimen creep displacement time curve in stages, the true creep parameter of the material can be obtained more accurately.

The invention discloses a parameter optimization method for a hollow cylindrical roller bearing based on load distribution and the fatigue life. In the method, on the basis of the calculation formulaof the elastic approach amount of a hollow cylindrical roller, in cooperation with the related contact deformation theory, load distribution of the hollow cylindrical roller bearing is solved with thedispersion method, the fatigue-life calculation method of the hollow cylindrical roller bearing is established in cooperation with the related bearing fatigue life theory, and theoretical direction is provided for application and development of the hollow cylindrical roller bearing. Calculated parameter information such as load distribution, the fatigue life and the rolling-body quantity is compared with actual requirement values, and parameters without meeting the requirements are further optimized.

The invention discloses a cooperative topology optimization design of thin-plate piezoelectric smart structures based on precise deformation control which is used for solving the technical problem of poor deformation precision of overall structure in present topology optimization design of piezoelectric smart structures. The technical scheme comprises following steps: firstly defining a target shape of the thin-plate piezoelectric smart structure deformation, selecting observation points, taking the error sum of squares of the actual deformation displacement and the target deformation displacement as a constraint, and taking the minimum flexibility of the piezoelectric smart structure as the goal. At the same time, the finite envelope circle method is adopted to avoid the geometric interference of the piezoelectric smart components. The sensitivity of the shape error function is obtained by the adjoint method. A piezoelectric smart component position layout and substrate structure topological configuration satisfying the deformation precision requirements are obtained through topological optimization. Because the relative error sum of squares of the observation point displacement is used as a constraint, compared with the background method, it is possible to more effectively control the deformation error of observation points with smaller target displacement and realize high-precision shape control.

The invention relates to the field of performance measurement of steel stamped parts and in particular to a method for measuring the volume distribution of retained austenite in a transformation induced plasticity (TRIP) steel stamped part. The method for measuring the volume distribution of retained austenite in the TRIP steel stamped part comprises the following steps of: firstly classifying the deformations into four standard deformation modes; then deducing the law of retained austenite transformation under a complicated strain path according to the plastic deformation theory; and finally calculating the volume content of retained austenite of each point on the part after deformation according to the main and secondary strain magnitudes. The method can be used for obtaining the volume content of retained austenite only by measuring the main and secondary stresses of the stamped part; has the advantages of simplicity of implementation, accurate result and low time and economic costs; and provides a basis for improving the formability of the TRIP steel by improving the part shape and the process addendum and/or the design of draw beads, so as to take full advantage of the effect of transformation induced plasticity of the TRIP steel and increase the application range of the TRIP steel.

The present invention relates to metallurgic technology, and is especially two-in-one pass schedule technology of rolling round bar and ribbed steel bar in an Morgan '8+4' rolling machine. According to plastic deformation theory of metal and through combining with technological practice, ribbed steel bar are rolled via allocating lengthening coefficient reasonably and enlarging the roll gap of pass schedule for rolling round bar, i. e., ribbed steel bars of 6 mm, 8 mm and 10 mm diameter are produced separately in a pass schedule of 5.5 mm, 6.5 mm and 8 mm diameter for producing round bar. The present invention has the features of saving in pass schedule replacing time, reduced faults, raised production efficiency and production stability, decreased technological spares, reduced production cost, etc.

The invention discloses a parameter optimizing method of a high-speed hollow cylindrical roller bearing. On the basis of an elastic approach calculation formula of a hollow cylindrical roller, with the combination of a relevant contact deformation theory, the load distribution and the fatigue life of the high-speed hollow cylindrical roller bearing are get by using a discretization method; with the combination of a relevant bearing fatigue life theory, the parameter optimizing method of the high-speed hollow cylindrical roller bearing is built, and a theoretical guidance is provided for the application and development of the hollow cylindrical roller bearing in the high-speed aspect.

The invention relates to a pressure double closed loop control method for the roll gap position of a cold-rolling mill, relating to the field of the rolling of a cold-rolled steel strip. The method is suitable for a roll force control mode on the main pressure of a cold-rolling mill. The method comprises the following steps of: calculating an asymmetric rolling force of two sides after the cold-rolling mill is additionally titled; deducing a support roller and work roller cylinder support beam type elastic bending influence function which is suitable for the asymmetric rolling calculation according to a karnofsky energy theorem; effectively integrating a roll system deformation theory and a metal transverse flow theory; effectively improving a deformation compatibility equation in the conventional roll system deformation theory; and carrying out real-time on-line and self-adapting modification on a theoretical calculation model in consideration of the error of theoretical calculation. After the method disclosed by the invention is used, the happening of a tape-breaking accident caused by excessive tilt adjustment can be effectively restrained, and the unilateral waves can be obviously controlled.

The invention relates to a device for reducing mutual coupling of a three-dimensional force sensor in each direction, which comprises an upper pressing plate, force transmission columns and a lower pressing plate, wherein the upper pressing plate transmits the endured vector force to the lower pressing plate through four uniformly-distributed force transmission columns; four surfaces of each forcetransmission column are provided with an X-direction resistance strain gauge group, a Y-direction resistance strain gauge group and a Z-direction resistance strain gauge group; and under effects of external load, the force transmission column generates elastic deformation, and the X-direction resistance strain gauge group, the Y-direction resistance strain gauge group and the Z-direction resistance strain gauge group can sense the deformation amount in each direction. Based on a bending deformation theory, through reasonable spatial arrangement on the resistance strain gauges in each direction, mutual interference among component forces is thus eliminated, the difficult problem of inter-dimension coupling existing in the three-dimensional force sensor is solved, and the measurement accuracy of the three-dimensional force sensor is improved.

The invention discloses an interface display method. The interface display method comprises the following steps: obtaining an application program in a mobile terminal interface selected by a user; receiving operation performed by the user on the mobile terminal interface and recording deformation force applied by the user to two sides of the mobile terminal during an operation process; determiningwhether the direction of the deformation force faces a user side or not; and opening the application program selected by the user when the direction of the deformation force faces the side of the user. The embodiment of the invention further discloses a mobile terminal and a readable storage media of a computer. Through the technical scheme of the embodiment, the invention brings forward a noveldisplay method for an interface of a flexible display screen so that user experience is added.

The invention relates to a manufacturing method of a male pelvic organ group entity model. The method comprises the steps of three-dimensional reconstruction of a medical image of a male pelvic organ group, designing and manufacturing of a single organ casting mold; selection and preparation of a single organ material and casting of a single organ; assembly of the single organ; internal environment simulation of a human pelvic cavity; and completing of manufacturing of the pelvic organ group entity model and experimental verification of the mechanical property of the pelvic organ group entity model. The male pelvic organ group entity model is highly consistent with the human actual condition in the aspects of pelvic organ structure and mechanical property, and can be applied to research of the total puncture force of the pelvic cavity and the deformation theory and simulated operation training; the problems that a living tissue is constrained by ethics and law are solved; the blank of a pelvic organ group entity model development technique is filled; and the manufacturing method has very wide application prospect in clinical medicine and experiment research.

The invention discloses a method for analyzing mechanical strength of a slotted casing. The method comprises the steps of preparing a slotted casing test-piece; obtaining physical and mechanics parameters of characteristics of the slotted casing test-piece; applying different loads on the slotted casing test-piece in the axial and radial directions; controlling load size, load time and load numberof times of the loads; obtaining a change rule curve of load-time, a change rule curve of stress-strain, and a change rule curve of load-displacement of the slotted casing test-piece; according to the curves above, establishing a mechanical strength-transformation theoretical model and a mechanical strength-load theoretical model of the slotted casing test-piece; embedding the models above into auniversal finite element model, based on minimum yield strength of the slotted casing test-piece, establishing a three-dimensional numerical calculation model of the mechanical strength of the slotted casing test-piece under stress load, therefore calculating and analyzing the mechanical strength characteristics of homogeneous pipe length slotted casing under different load acting forces, and obtaining the results of the mechanical strength characteristics of homogeneous pipe length slotted casing.

The invention discloses a determining method for a deformation ratio considered two-dimensional flat spring net structure. The method comprises the following steps of building a basic unit model formed by connecting four one-dimensional flat springs and four circular rings end to end at intervals; building a flexible net structure model, which is connected with M basic unit models and (M+1) one-dimensional flat springs at intervals in the transverse direction and connected with N basic unit models in the longitudinal direction; deducting the relational expression of the deformation ratio of the one-dimensional flat springs at the transverse position and the load borne by the basic unit models; deducting the relational expression of the deformation ratio of the basic unit model and the loadborne by the basic unit models; deducting the relational expression of the deformation ratio of the flexible net structure models and the total load borne by the flexible net structure models in thetransverse and longitudinal directions, and working out the total load and the deformation ratio of the one-dimensional flat springs at the transverse position according to the numerical relationshipamong the deformation ratio of the basic unit models, the deformation ratio of the one-dimensional flat springs in the basic unit models and the included angle formed after the basic unit models deform.

The invention proposes a pressing force adjustment method for controlling an inter-drill-layer burr of a laminated plate. The method comprises the steps of determining an undetermined coefficient in a drill force empirical formula through a mathematic statistics method by utilizing the drill force empirical formula and drill force test data; obtaining a credible drill force prediction value of a to-be-optimized working condition machining process; establishing a laminated plate deformation theory model according to an existing theory; determining an extrusion region range of laminated plate mutual extrusion of the laminated plate deformation theory model in a search and debug mode; obtaining a function relationship between a maximum value of an inter-layer gap and a value of pressing force; controlling a target threshold in combination with the given inter-layer gap; and performing parameter optimization on the value of the pressing force to obtain optimal pressing force. According to the method, the optimal pressing force can be obtained through adjustment and the inter-layer gap of the laminated plate is reduced to be in an ideal range, so that the height of the inter-layer burr can be effectively controlled and side effects caused by pressing are avoided as far as possible.