63 results about "Impact velocity" patented technology

The invention relates to a dynamic characteristic modeling method and system for an alternating impact disassembling operation robot, and relates to the technical field of robot control, and the method comprises the steps: firstly, comprehensively considering the dynamic characteristics of a robot joint side and a motor side, building a torque-driven flexible joint dynamic model, and determining the influence of joint flexibility on impact response; secondly, estimating normal impact force and tangential friction force by adopting an exponential inelastic continuous contact model, constructing an alternating impact dynamic model, and quantifying momentum change and a nonlinear dynamic effect in the impact process; and finally, a multi-space dynamic characteristic coupling model is established, the interaction mechanism of the joint space, the impact contact space and the task space is systematically analyzed, the accurate speed after impact is output, an impact force control strategy is generated, the dynamic response precision of the robot under the alternating impact operation is improved, the active utilization of the robot on the impact effect is achieved, and the reliability of the robot is improved. And the stability, the accuracy and the high efficiency of the disassembling operation are ensured.

The invention relates to the technical field of numerical simulation of rock dynamics, in particular to a numerical simulation method and system for the whole process of ore rock fracture based on FDEM impact loads.The method comprises the steps that a continuous medium structure is discretized into a finite element network composed of triangular units through FDEM, and an ore rock impact test model is constructed; setting material parameters and impact speed boundary conditions according to the ore rock impact test model; a normal contact force calculation model and a tangential contact force calculation model are established according to material parameters and impact speed boundary conditions, and coordinates and speed updating results of triangular unit nodes are obtained in combination with the Newton second law and the calculation models; and performing visual analysis based on the coordinate and speed updating result, and outputting crack propagation, stress field and energy evolution results under the impact load. The method can accurately simulate the crack propagation, the fracture mode and the energy evolution law of the ore rock under the impact load, quantitatively researches the crushing characteristics and the energy evolution law of the ore rock, and provides a calculation method for the research of the crushing mechanism of the ore rock.

The invention provides a coal body strain synchronous in-situ monitoring device and method based on true triaxial impact, and relates to the field of coal body dynamic testing and structural damage monitoring. Comprising a sample bearing module, an impact loading module, an internal fiber bragg grating dynamic strain monitoring module, a surface strain gauge monitoring module, a synchronous data acquisition module, a microscopic crack detection module and a macroscopic failure analysis module, the impact loading module is used for applying a transient impact load with a set impact speed to the gas-solid coupling coal sample, and the internal fiber bragg grating dynamic strain monitoring module is embedded with at least one fiber bragg grating sensing grating point along three mutually orthogonal directions of the gas-solid coupling coal sample respectively. The damage evolution mechanism of the gas-solid coupling coal body under the high strain rate condition is disclosed, and a means is provided for risk analysis of the rock burst-coal and gas outburst hybrid power disaster.

The invention discloses a hydrogen fuel automobile hydrogen reactor anti-impact force detection device, which comprises a sliding rail, and is characterized in that the sliding rail has a driving function and is fixedly arranged on the ground; a rotating frame is arranged on the collision support, the collision assembly is detachably connected with the rotating frame, and the collision assembly rotates along the edge of the rotating frame in the horizontal plane; the hydrogen heap and the chuck slide along the arc-shaped track, and the angle of the hydrogen heap and the chuck is changed; the sliding rail drives the sliding vehicle to slide; the balancing weight is arranged on the sliding vehicle, and the chuck is located between the balancing weight and the collision support. The hydrogen reactor has the beneficial effects that the hydrogen reactor has certain impact inertia through the multiple counter weights, the hydrogen reactor has certain impact speed through the driving effect of the sliding rail, and the impact angle of the hydrogen reactor can be changed through the guiding effect of the arc-shaped rail; the impact condition of the hydrogen reactor in the vehicle driving process can be simulated, and the difference between the impact data and the reality is reduced.

Exemplary embodiments of apparatus and methods for remotely and explosively cutting the casing of a UXO and separating the fuzing components from the main charge in the UXO. A remote explosive separation tool creates a Linear Explosively Formed Projectile (LEFP) charge to separate fuzing components from live explosive threats in UXO, for example only, a 155 mm artillery round. The tool functions by explosively deforming a copper liner into a linear projectile or penetrator which then impacts the UXO casing. The speed of impact enables the fuzing elements of the UXO to be removed from the main charge of the UXO either by directly cutting the fuze elements off or by imparting the fuze elements with enough momentum such that they break off. The process of dismembering the fuze elements occurs without detonating the main charge of the UXO. The tool may be remotely placed by an unmanned vehicle.

The invention relates to the technical field of finite element biomechanical simulation, and discloses a multi-dimensional parameterized human body model simulation verification method based on a K file. An impact hammer finite element model is established, an impact speed parameter is defined in a K file, and the impact speed of the impact hammer finite element model is determined through an impact part and the impact speed parameter according to a specific impact working condition; adjusting the unit system of the finite element model of the impact hammer based on the unit system corresponding to the human body model; positioning a human body model based on the impact part parameters; defining a contact set based on the collision part, calling the contact set corresponding to the collision part in the K file according to a specific collision working condition, and establishing a contact relationship between the finite element model of the impact hammer and the human body model; simulation collision is carried out based on the impact speed, the adjusted unit system of the impact hammer finite element model, the positioned human body model and the contact relation, rapid construction of a human body model verification simulation model is achieved, and the working efficiency is improved.

A method for assessing damage to concrete bridge piers after vehicle impact, comprising: (1) calculating the impact kinetic energy under different impact speed and impact mass combinations; E , strain rate #imgabs0# and section damage factor d k ; (2) Establishing cross-sectional damage factor d k and impact kinetic energy E , the mathematical model between strain rate #imgabs1#; (3) obtain the strain rate #imgabs2#-impact kinetic energy E Damage state evaluation threshold expression; (4) Establish strain rate #imgabs3#-impact kinetic energy E The damage status assessment cloud map determines the damage status of concrete piers. This method not only considers the contribution of vehicle impact kinetic energy to concrete pier damage, but also takes into account the influence of strain rate effects on concrete pier impact damage. This method establishes a method for assessing the degree of damage to concrete piers after vehicle impact. This method truly reflects the degree of damage to concrete piers after vehicle impact, providing a reference for the crash-resistant design of concrete piers and the rapid and accurate assessment of pier structures after vehicle impact.

The invention relates to the technical field of equipment testing, in particular to shock test equipment and method for a buffer. Comprising a supporting body, a first spring and a telescopic piece are installed at the top of the supporting body, and a pressure sensor is installed at the joint of the top of the supporting body and the first spring; a positioning mechanism is fixedly mounted at the telescopic end of the telescopic piece; a lifting mechanism is installed at the top of the supporting body, the free end of the lifting mechanism is connected with an impact part, and the lifting mechanism is used for pulling the impact part to the designated height. The positioning mechanism is used for positioning and adjusting the initial position of the impact part, and the first spring is located over the impact part; buffers are placed at the bottom of the supporting body. The shock test equipment for the buffer can adjust the impact speed and the impact acceleration of the impact part by changing the external force applied to the impact part and the mass of the impact part, so that extreme working conditions such as high-speed impact and multiple impacts are simulated, and the performance redundancy of the buffer in a limit state is verified.

Shock struts are provided that include a first energy absorbing stage or first load limiter and a second energy absorbing stage or second load limiter. The second energy absorbing stage or second load limiter can include one or more disc springs (205). The shock struts can be used in both fixed and retractable landing gear while providing design tunability for obtaining a load-deflection curve that accommodates a range of descent or impact velocities.

The application discloses a kind of surface nanocrystalline powder metalling device, including infiltration tank, transmission mechanism and clamping mechanism, it is characterized in that, the transmission mechanism is by fixed frame, input shaft, first bevel gear, second bevel gear and third bevel gear are formed, the infiltration tank is by left end cover, tank body and right end cover are formed, tank body inner surface is evenly provided with baffle, heating plate is arranged between tank body and heat preservation box, rotating shaft in tank body is provided with left sealing plate, right sealing plate and clamping mechanism, workpiece is installed on clamping mechanism, projectile and infiltrant are arranged between left sealing plate and right sealing plate, the linear velocity of projectile is 2.5~10m / s, the radius r of tank body and projectile linear velocity satisfy formula, beneficial to transmission mechanism so that tank body and rotating shaft produce reverse rotation, increase the relative impact velocity of projectile and workpiece, make plastic deformation on the surface of workpiece and form nanometer layer, effectively solve the problem that material after nanocrystallization pretreatment faces in heat expansion infiltration process.

The application discloses a kind of one-dimensional force electric characteristics of concrete test piece and system, it is related to the cross field of detection and intelligent sensing technology of civil engineering material dynamic mechanical property.Testing method includes the following steps: S1: using one-dimensional Hopkinson pressure rod experimental device to the concrete test piece pre-embedded piezoelectric sensor is axially impacted loading, obtains incident wave signal, reflection wave signal and transmission wave signal;The current and voltage corresponding to the resistance obtained in parallel to the two ends of piezoelectric sensor;S2: obtaining the one-dimensional stress-strain curve of concrete test piece;S3: based on current and voltage, the charge amount generated by piezoelectric sensor is obtained;S4: the impact velocity of impact rod is changed and the stress-charge amount variation curve is obtained by repeating steps S1-S3.Getting the axial stress of concrete test piece and the charge amount output by piezoelectric sensor simultaneously, constructs stress-charge amount relationship curve, realizes the quantitative calibration of dynamic sensitivity.

This invention discloses a quantitative analysis method for the impact characteristics of a forging hammer based on a pulse function. The invention includes: obtaining the formula for the average impact force, as follows: ; obtaining the integral formula for the average impact force based on the unit pulse function and the formula for the average impact force; obtaining the expression for the peak impact force based on the pulse peak factor, rebound coefficient, and influence coefficient, as follows: , where is the peak impact force, is the influence coefficient, is the pulse peak factor, is the hammer mass, is the hammer impact velocity, is the mass ratio, is the reciprocal of the mass ratio, and is the base mass, which includes the mass of the equipment and the foundation. This invention solves the problem of large calculation errors in the impact force of forging hammers in related technologies.

The invention discloses a method for determining the weakest bird strike part of a fan rotor blade of an aero-engine. The method comprises the following steps: acquiring blade parameters, setting the axial relative speed of a bird body and the radial rotation radius of a strike position, establishing a fan blade bird strike mathematical model, and outputting the relative strike speed between the bird body and the blade; setting bird body parameters, constructing a cylindrical bird body model, and calculating the maximum bird body impact mass; calculating impact kinetic energy in combination with the relative impact speed; constructing bird strike equivalent stress, obtaining standard bird strike equivalent stress, and drawing a standard equivalent stress C-R distribution curve; and in the C-R distribution curve, the position of the radial rotation radius corresponding to the maximum equivalent stress on the blade is determined as the weakest bird impact part. According to the method, quick and quantitative identification of the weak bird impact area of the fan blade under various flight conditions is realized, the design of a bird impact resistant structure and the formulation of a whole machine bird swallowing test scheme can be effectively guided, and the method is high in engineering practicability, high in analysis efficiency and wide in adaptability.

This invention discloses an electromagnetic pulse welding coil for welding tubular metals. The electromagnetic pulse welding coil is arranged circumferentially along a driving tube. The driving tube can obtain Lorentz force through electromagnetic induction of the electromagnetic pulse welding coil, providing the impact velocity for welding. The electromagnetic pulse welding coil is composed of several circumferentially connected "convex"-shaped structures. The "convex"-shaped structures are arranged with an inward rotation of 90°, and the wide end at the outer end has a notch. One side of the notch is connected to the other side of the notch of the adjacent "convex"-shaped structure through a connecting block, thereby connecting all the "convex"-shaped structures into a whole, forming a ring structure around the driving tube. This invention has the advantages of significantly improving the electromagnetic energy utilization efficiency, increasing electromagnetic energy, and being applicable to electromagnetic pulse welding of difficult-to-deform metals.

The invention relates to the absorption mechanism that most reduces the back impact speed of the mechanism after firing in firearms to the extent that it does not prevent the healthy operation of the weapon.

The invention relates to an impact speed mechanical sensor applied to a severe environment, and relates to the field of sensors, the impact speed mechanical sensor comprises a shell, an upper cover plate, an inner core and a force sensor, the force sensor is placed at the bottom of the shell, and a plurality of groups of square strips which are different in length and made of super-viscoelastic and super-elastic materials are arranged in the inner core at intervals; the inner core is placed on the force sensor, the upper cover plate is placed on the inner core and is in sliding connection with the shell, and the device has the advantages that impact signals can be converted into visual information or force signals only through a mechanical structure, and the device can be widely applied to impact monitoring scenes with high requirements for reliability and environmental adaptability.

The invention relates to the technical field of welding, and provides a method for eliminating welding stress of high-strength steel and a removing device and system. The method comprises the steps that S1, welded high-strength steel is fixed, so that the flatness error of a plane corresponding to a welding seam of the welded high-strength steel meets a set threshold value; the strength of the high-strength steel is greater than or equal to 1500MPa; s2, based on the strength of the high-strength steel, impact parameters of the stress removing device are configured, and the impact parameters at least comprise the amplitude of an impact head, the impact frequency of the impact head, the impact speed and the diameter of an impact needle; and S3, a stress removing device is adopted for impacting the thermal response area of the weld joint according to a preset strategy so as to eliminate residual stress generated after high-strength steel welding. The technical defect that the fatigue life of a high-strength welding part is poor due to the fact that the welding stress is too large after the high-strength steel is welded is overcome.

A method for constructing a mathematical model of critical impact energy of a reinforced concrete pier column, comprising: (1) establishing a two-degree-of-freedom mass-spring-damper motion equation of the reinforced concrete pier column under drop hammer impact; (2) obtaining equivalent resistance stiffness and failure displacement of the reinforced concrete pier column by applying a nonlinear cross-section fiber finite element model, and taking into account impact strain rate effect; (3) solving the two-degree-of-freedom mass-spring-damper motion equation under different impact velocities to obtain a velocity-displacement curve and critical impact energy of the pier column under impact; (4) calculating the critical impact energy under different axial compression ratios and longitudinal reinforcement ratios; and (5) establishing a mathematical model of critical impact energy of the reinforced concrete pier column. The mathematical model of critical impact energy of the reinforced concrete pier column constructed by the method truly reflects the limit capacity of the reinforced concrete pier column under impact load, and can provide a reference for rapid evaluation of the limit impact resistance bearing capacity of reinforced concrete.

The invention discloses a runner wear-resistant method and system by controlling the particle impact speed, and the method can effectively reduce the impact speed of solid particles on runner blades to be below a material critical value, obviously alleviate the abrasion damage, prolong the service life of a runner, and improve the wear resistance of the runner. And the lubricating oil has good working condition adaptability and synergistic application potential with the existing anti-wear technology.

The present invention relates to the field of equipment testing technology, and specifically to a buffer shock test device and method. It comprises a support body, a spring 1 and a telescopic member are installed on the top of the support body, a pressure sensor is installed at the connection between the top of the support body and the spring 1; a positioning mechanism is fixedly installed on the telescopic end of the telescopic member; a lifting mechanism is installed on the top of the support body, an impact member is connected to the free end of the lifting mechanism, and the lifting mechanism is used to pull the impact member to a specified height; the positioning mechanism is used to position and adjust the initial position of the impact member, and the spring 1 is located directly above the impact member; the bottom of the support body is used to place the buffer. The buffer shock test device can adjust the impact speed and impact acceleration of the impact member by changing the external force applied to the impact member and the mass of the impact member, thereby simulating extreme working conditions such as high-speed impact and multiple impacts, and verifying the performance redundancy of the buffer under extreme conditions.

The present application provides a portable device and a method for relieving the impact force of a pump station flap, which comprises: an inertia disc for containing fluid sheared with a brake vane, the inertia disc being interference fitted with a fixed shaft of the pump station flap; a surface of the inertia disc facing the pump station flap is concave to form a containing cavity I for containing fluid; a fluid filler receiving box for providing fluid, which is provided with a containing cavity II in communication with the containing cavity I, the volume of the containing cavity II being adjustable; a transmission turntable for driving the brake vane to do centrifugal motion, the transmission turntable being arranged in the containing cavity I of the inertia disc; one end of the brake vane is hinged to a surface of the transmission turntable, and the other end is a free end; a resistance reset unit for prolonging the action time of the brake vane with the fluid and resetting the brake vane in the radial direction; and a sealing plate for sealing the surface of the inertia disc facing the pump station flap. The present application can slow down the impact speed of the pump station flap and reduce the impact force of the pump station flap on the door seat when the pump station flap is closed.

The present invention provides a method for evaluating the impact safety of explosive charges based on equivalent model tests, including: S10, obtaining the dynamic mechanical parameters of the explosive charge and selecting a constitutive model, then determining its undetermined parameters, obtaining the curve of the shock wave pressure varying with the measurement position, and determining the parameters of the three-term ignition growth model in combination with finite element software; S20, obtaining the remaining velocity of the bullet after penetrating the shell and the deformation and damage morphology of the bullet head; S30, conducting equivalent model tests according to S20 to obtain the velocity intervals corresponding to different safety response levels; establishing a geometric model of the equivalent model test, substituting the model determined in S10 into the geometric model of the equivalent model test to obtain the maximum equivalent stress, maximum shear stress, and reactivity of the explosive charge at different impact velocities; combining the results of the equivalent model test and numerical simulation to obtain the intervals of the maximum equivalent stress, maximum shear stress, and reactivity corresponding to different response levels of the explosive charge.

The invention relates to the field of ocean engineering and hydrodynamics, and discloses a method and device for evaluating the impact load of a deep sea density flow on a structure, and the method comprises the steps: constructing a computational fluid dynamics two-phase flow model, simulating the transient impact of the deep sea density flow on the structure under the conditions of different initial impact heights, impact speeds and Reynolds numbers based on the two-phase model, and calculating the impact load of the deep sea density flow on the structure. Obtaining a resistance time travel curve of the structure; the peak resistance coefficient of the offshore structure is determined after the limit peak resistance and the maximum acting height of the density flow are extracted from the resistance time history curve; determining a load analysis model based on the peak resistance coefficient, the limit peak resistance, the maximum acting height of the density flow, the speed and the density; and determining an impact load result of the deep sea density flow on the offshore structure based on the load analysis model. According to the scheme, actual measurement does not need to be carried out every time in actual engineering application, the load result can be obtained based on impact load model analysis, and the evaluation efficiency of the impact effect of the deep sea landslide on the fan pile foundation is improved.

The invention discloses a device for testing icing adhesive force of liquid drops at different impact speeds. The device comprises a water dripping system, a telescopic guide pipe, a guide rail bottom plate assembly and a bottom plate angle adjusting mechanism. The dripping system is located at the top of the device and provided with a dripping device, and single or continuous liquid drops can be generated. And the telescopic guide pipe can adjust the drop height of the liquid drop, so that the impact speed of the liquid drop is controlled, and the icing experiment requirements under various working conditions are met. A slidable guide rail is arranged in the guide rail bottom plate assembly, samples made of various materials such as copper, aluminum and steel can be installed and taken out, a detachable ice mold device is arranged on a sample plate, the bottom plate angle adjusting mechanism is composed of two precise elevators at the bottom and a lateral rotating shaft, and the inclination angle of a bottom plate can be adjusted by controlling different heights of the elevators. Therefore, the icing process that liquid drops impact the surface of a material at different angles can be simulated.

The invention discloses an aero-engine fan blade foreign matter impact detection device, and relates to the technical field of aero-engine performance detection.The technical scheme includes that the aero-engine fan blade foreign matter impact detection device comprises a detection unit, a foreign matter emission unit and a linkage unit, and the detection unit comprises an electricity guiding device connecting socket, a camera connecting socket, a high-speed detection camera and a controller connecting plug; the foreign object launching unit comprises a feeding mechanism, a low-speed launching mechanism, a high-speed launching mechanism and an air cylinder, the linkage unit can switch any launching mechanism to be connected with the air cylinder, the air cylinder can store energy for the connected launching mechanism, and the low-speed launching mechanism and the high-speed launching mechanism can launch materials in the feeding mechanism after storing energy. According to the fan blade impact detection device, through the arrangement of the overall structure, the influence of different impact speeds on fan blades can be detected, and the detection result is more accurate.

The application discloses a kind of instrumented impact testing machine dynamic force sensor calibration method based on double-pulse method, standard cuboid sample is generated by using pendulum impact standard, and standard double-pulse force can be traced to sample attribute (sample size, mass and Young's modulus) and pendulum impact velocity (or pendulum effective length) above, and then the calibration method of instrumented impact testing machine dynamic force sensor is traced to source;Propose a kind of design method for the sample required for the sweep frequency calibration of instrumented impact testing machine dynamic force sensor, to achieve the purpose of sweep frequency calibration of instrumented impact testing machine dynamic force sensor.This method can stably, reliably and quickly realize the high-frequency calibration of instrumented impact testing machine dynamic force sensor under the premise of effectively ensuring calibration accuracy, and fills the blank of existing instrumented impact testing machine dynamic force sensor calibration method.

The invention belongs to the technical field of geological disaster protection engineering, and discloses a reinforced concrete slab damage evaluation method based on an M-V curve, and the method comprises the steps: determining related design parameters of a reinforced concrete slab; defining the threshold values of the four damage degrees of mild damage, moderate damage, severe damage and complete failure; calculating critical values M0 and V0 of four damage degrees in the M-V curve; drawing an M-V curve; scanning side slope characteristics, simulating a side slope rockfall movement track, and obtaining a plurality of groups of rockfall mass and impact speed combinations; determining the damage grade of the reinforced concrete slab according to the actual rockfall quality and impact speed; counting the number of falling rocks in different damage areas, and calculating the damage probability. The damage evaluation method provided by the invention can rapidly quantify and predict the impact damage degree of the composite cushion layer concrete slab, can be used for evaluating the impact resistance of the reinforced concrete slab with any section covered by any composite cushion layer with any thickness, and provides a reference for the prevention and treatment of rockfall disaster resistance of the reinforced concrete slab.

The application discloses a VRU collision working condition test method of an automobile event data recording system, and comprises the following steps: S1, adjusting a to-be-tested vehicle to a preset working state, so that the vehicle is located in an environment with a preset temperature; S2, installing an impact module on a launching system, and launching the impact module at a preset impact speed to a preset impact position of the vehicle through the launching system; the preset impact speed is equal to a VRU event trigger minimum speed value set by an automobile event data recording system (EDR); S3, collecting a real-time impact speed of the impact module and the vehicle during the impact of the impact module and the vehicle, and reading record data on the EDR when the reading is equal to the preset impact speed and an actual impact position of the vehicle is the preset impact position on the vehicle. The application can uniformly test VRU collision working conditions of various automobile models with EDRs, and more comprehensively and reliably masters technical performances of the automobiles.

The bullet throwing type load spraying deceleration type non-lethal kinetic energy bullet comprises a bullet assembly, a load assembly, a bullet body assembly and a launching assembly, the bullet assembly is integrally formed by adopting a high-ductility polyurethane material through a vacuum coating process, micron-sized grooves are engraved in the surface of the bullet assembly through laser, and a stepped cylinder and a directional blasting circular truncated cone structure are combined; non-lethal kinetic energy transmission and accurate bullet throwing are achieved; on the basis of a delayed ignition mechanism, the load assembly drives the push disc through sequential combustion of double-layer explosion expanding powder (solid-state composite explosion expanding powder and bulk explosion expanding powder), OC stimulation powder is synchronously released for directional dispersion, and dynamic speed reduction is achieved through the reverse action of explosion impact force and powder spraying; the method has the advantages of high-precision soft strike, stimulation and dispersion, end deceleration and the like, the dual requirements of reliable launching for high initial speed and end non-fatal strike for low impact speed are effectively met, the probability of accidental injury is remarkably reduced, and the method is suitable for various complex task scenes.

This invention belongs to the field of aero-engine technology, specifically a method for assessing erosion damage to aero-engine compressor blades that integrates multiple operating parameters. The method includes: determining the fluctuation range of operating influencing parameters through on-site sampling and flight parameters; constructing a multi-parameter sample set using Latin hypercube sampling; deriving an erosion wear theoretical model; identifying key parameters related to target material characteristics and impact velocity by combining sand particle velocity measurement and titanium alloy erosion experiments; establishing a gas-solid two-phase flow finite element model; substituting the sample set into the model to solve for the wear rate concentration value; using a polynomial chaotic expansion method to obtain the relationship between operating influencing parameters and the wear rate concentration value; and deriving the statistical characteristics of the wear rate concentration value; finally, calculating the statistical characteristics of damage depth by combining erosion time and blade surface area. This invention achieves high-precision assessment under dynamic coupling of multiple parameters, solving the problems of single parameters and poor model adaptability in traditional methods, and significantly improving its engineering practical value.