98 results about "Impact loading" patented technology

The invention relates to the technical field of bumper detection, in particular to an automobile bumper detection method and system, and the system comprises a rigid test bench, a multi-point adjustable impact loading module, a bumper surface deformation monitoring module, and a control and processing module. The to-be-tested automobile bumper is fixed on the test bench according to a preset mode, and the plurality of sensors are arranged based on a preset position; carrying out dynamic and static balance test on the to-be-tested automobile bumper according to the received control instruction, and carrying out corresponding index calculation; on the basis of static and dynamic test indexes, a quantitative report is generated, whether the balance of the bumper structure reaches the standard or not is automatically judged, complex static supporting and dynamic impact working conditions possibly encountered by the bumper on a vehicle can be effectively simulated in an integrated process, the static stability of the overall structure and the coordination under power impact of the bumper can be quantitatively evaluated, and the reliability of the bumper structure is improved. Therefore, the structural safety performance of the bumper can be reflected more truly.

The utility model provides an anti-impact connecting bolt fastening structure of a high-voltage isolating switch, and relates to the technical field of high-voltage switches, the anti-impact connecting bolt fastening structure comprises a high-voltage isolating switch base and a switch anti-impact bolt connecting assembly, through bolts penetrate through the inner sides of base bolt holes, the lower side of a bolt head rubber mat is provided with a back shore spring, and the back shore spring is connected with the switch anti-impact bolt connecting assembly. A limiting sleeve is connected to the outer side of the jacking spring in a sleeving mode, a nut rubber mat is arranged on the lower side of the limiting sleeve, a connecting nut is arranged on the lower side of the nut rubber mat, a metal locking nut is arranged on the lower side of the connecting nut, and due to the effective buffering effect of a damping rubber mat, damage of vibration to the base is remarkably reduced, and the service life of equipment is prolonged; and through rotation of the penetrating bolt, rapid mounting and dismounting can be achieved, firm and reliable connection is ensured, and through adjustment of the fastening strength of the penetrating bolt, impact loads under different working conditions can be flexibly coped with, and stable operation of equipment is ensured.

The invention provides a dynamic strength test system and method for a soft rock biaxial Hopins compression bar, and the system comprises an axial impact loading unit which is used for generating an axial impact load; the confining pressure loading unit is used for applying radial confining pressure to the sample; the high-pressure fluid injection unit is used for injecting high-pressure fluid into the sample and simulating different internal water pressure and water saturation conditions; the data acquisition unit is used for recording impact load, confining pressure, internal water pressure and sample dynamic response data in real time; the control system is used for coordinately controlling the axial impact speed, the confining pressure and the internal water pressure value; by integrating the axial impact loading unit, the hydraulic servo confining pressure loading unit and the high-pressure fluid injection unit, a test platform capable of truly simulating a complex stress-seepage coupling environment where the deep soft rock is located is formed; therefore, the synchronous, independent and accurate control of axial dynamic load, constant or dynamic confining pressure and internal pore water pressure is realized.

The invention discloses a method for predicting the dynamic response of a corrugated steel-concrete combined arch shell under the action of an impact load, relates to the field of constructional engineering, and aims to solve the problem that a model for rapidly predicting the dynamic response of the corrugated steel-concrete combined arch shell under the action of the impact load is lacked in the prior art. Comprising the steps of 1, constructing a motion equation of a combined arch equivalent single-degree-of-freedom model; step 2, constructing equivalent model quality; 3, ignoring damping in the impact loading process, introducing the influence of the damping in the unloading stage, and constructing system damping in the equation; 4, describing the dynamic response of the combined arch under the action of the impact load by adopting an ideal double-broken-line resistance function, and constructing a resistance function; 5, the deformation rigidity in the equation is constructed through deformation decomposition of the combined arch; and 6, solving the motion equation of the equivalent single-degree-of-freedom model of the combined arch by combining the steps 2-5, and predicting the deformation of the combined arch under the action of the impact load.

The invention belongs to the technical field of impact fatigue tests of metal materials, and relates to an impact fatigue test system for simulating a working condition environment of a gun firing pin, which can perform high-frequency cyclic loading of 200MPa-500MPa, microsecond (mu s) level impact pulse and more than kilohertz (kHz), and synchronously simulate the working condition environment. High-energy, high-frequency and short-pulse impact loading under the gun and gun firing pin working condition is carried out through the high-frequency impact generation subsystem, and the dynamic mechanical environment in actual service is effectively simulated; the environment simulation subsystem is used for accurately controlling the temperature, the concentration and the pH value of media such as salt mist and seawater, and is synchronously coupled with mechanical shock, so that mechanical-electrochemical synergistic damage conditions are truly represented; dynamic stress, strain, electrochemical parameters and surface topography in the impact process are synchronously monitored through a multi-parameter synchronous acquisition subsystem, and complete data support is provided for researching the damage evolution law of a material under a complex load; the repeatability and the safety of the test are ensured through the modularized sample clamp subsystem and the dynamic sealing design.

The invention relates to the technical field of hub bearings, in particular to a hub bearing. The hub bearing comprises an outer ring unit, an inner ring unit, a rolling body, a first dynamic sealing unit and a second dynamic sealing unit. The outer ring unit comprises an outer ring main body and a threaded connection part; the inner ring unit comprises a first inner ring and a second inner ring; the first inner ring comprises an inner ring main body and a flange; the flange and one axial end of the inner ring main body are integrally formed; the inner ring main body and the second inner ring are positioned in the outer ring main body; the end face, facing the flange, of the outer ring body is a first collision face. The end face, facing the outer ring body, of the flange is a second collision face. A movable gap is formed between the first collision surface and the second collision surface; when the axial acceleration of the inner ring unit is 0, the movable clearance is 0.3-0.5 mm; the movable gap is gradually reduced in the direction away from the axis of the hub bearing. Therefore, the problems that the rolling body is subjected to impact loading force for a long time, so that the raceway is subjected to dent deformation, and abnormal sound is generated are solved.

The invention relates to the technical field of shield cutter tests, and discloses a test device for simulating a damage behavior under the impact and cutting action of a shield hob, the test device comprises a shell, an impact loading assembly, a cutter mounting table, a horizontal moving assembly, a sample clamping assembly and a collecting assembly, the impact loading assembly is arranged at the top of the shell, and the cutter mounting table is arranged on the shell; the tool mounting table is arranged at the bottom of the impact loading assembly, a first tool apron is arranged on the side wall of the tool mounting table, the horizontal moving assembly is arranged in the shell, and the sample clamping assembly is arranged on the surface of the horizontal moving assembly; coherent actions of impacting and cutting are realized by laterally mounting the hob, interference is avoided by combining with an adjustable structure of a sample position, and by matching with multi-dimensional data acquisition, actual working conditions of the hob under complex geology can be accurately simulated, and stress response and damage evolution characteristics of the hob are comprehensively captured. Key support is provided for optimizing cutter design, improving tunneling reliability and reducing construction risks, and the limitation of an existing single loading or static test is effectively made up.

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.

This invention provides a multi-field coupled shear testing device, including a test host, a pressure chamber, a power distribution cabinet, and a water supply device. The test host is supported by a workbench. The confining pressure chamber, together with the vertical, horizontal, and longitudinal loading systems, applies a three-dimensional static load. Within the horizontal loading system, an impact transmission rod connects to a nitrogen high-pressure emission chamber to achieve impact loading. The sealed high-temperature chamber has a vacuum glass window on the outside, and the internal shear box chassis is raised and equipped with water channels. A membrane is used to wrap the specimen to prevent leakage. The vertical loading system has a built-in cooling device, and an acoustic emission probe is installed on the pressure rod to monitor damage in real time. This device achieves multi-field coupling of high temperature, high pressure, seepage, and impact through modular design, offering high loading accuracy and convenient operation. It solves the functional conflicts and monitoring lag problems of traditional equipment and is suitable for multi-field mechanical property testing of geotechnical materials.

The utility model provides a cradle structure for a machine gun weapon station. The cradle adopts a double-trunnion-hole groove-shaped structure, a trunnion hole is formed in the side wall of one end, and a guide rail is fixedly connected to the other end in a groove. The sliding base is installed on the guide rail and can slide along the guide rail, weapon installation structures are arranged at the first end and the second end of the sliding base respectively, the first end is closer to the trunnion hole of the cradle than the second end, and the protruding block in the middle of the guide rail is located between the first end and the second end. One end of the buffer rod is connected to the bump of the guide rail, and the other end is connected to the second end of the sliding seat. The buffer spring can buffer forward impact and recoil force generated when a weapon is shot, and the buffer rod is sleeved with the portion, between the protruding block and the second end, of the buffer spring. The buffering device is compact in structure, the buffering device can be provided for a small-caliber weapon without an external buffering device, so that the weapon rushes forwards and sits backwards in the shooting process, meanwhile, the spring buffers the impact load, and the stress of the trunnion and the bracket can be reduced to protect the trunnion and the bracket.

The invention belongs to the technical field of coal rock mechanical property testing, particularly relates to a mechanical testing device and method for coal rock loading, and solves the problems that an existing device is single in function, fragments splash, cleaning is inconvenient, and protection and cleaning are not linked. The device comprises a supporting mechanism, and a modular loading mechanism is detachably mounted on the supporting mechanism and comprises a static extrusion loading module and a dynamic impact loading module; the linkage type protection mechanism is provided with two protection half barrels, and fragments can be prevented from splashing when the two protection half barrels are closed; the sweeping mechanism is started when the protective half barrels are unfolded, a rotating ring drives a Z-shaped plate to rotate, an annular inclined panel is driven to vibrate, and fragments are swept; the device integrates a static extrusion function and a dynamic impact function, so that the equipment utilization rate and the application range are improved; protection and cleaning are linked, safety is guaranteed, cross contamination is avoided, and the experiment accuracy and efficiency are improved.

The invention discloses a power battery anti-explosion performance detection system and method and a storage medium, an impact loading module in the system is connected with a battery mounting mold, and a metal foil included in the impact loading module generates electric explosion through instantaneous pulse current output by a high-voltage pulse power supply unit to generate impact waves; the shock wave pushes the flyer to realize ultra-high-speed impact on the power battery; and the information acquisition module is used for acquiring the impact information and obtaining a detection result of the explosion-proof performance detection based on the impact information. According to the invention, the ultra-high-speed impact possibly suffered by the power battery in an actual application scene can be simulated, and an extreme and real test environment is provided for the power battery, so that the accuracy of a detection result of explosion-proof performance detection is improved.

This utility model relates to the technical field of single-end mechanical seal structures. It provides a balance-free single-end mechanical seal structure suitable for high-pressure and high-temperature environments, comprising a stationary ring, a rotating ring, and a spring-loaded seat. The stationary and rotating rings slide tightly against each other at their opposite ends. The spring-loaded seat is pressed against the top of the rotating ring. The spring-loaded seat includes a rotating ring positioning ring and a locking ring. The rotating ring positioning ring is engaged with the lower end face of the rotating ring, and the locking ring is locked onto the shaft to be sealed and rotates with it. Elastic connecting elements are provided at four positions (front, back, left, and right) between the locking ring and the rotating ring. Four damping connecting pads are also provided between the locking ring and the rotating ring. The four damping connecting pads and the four elastic connecting elements are staggered around the center of the locking ring. This mechanical seal structure, through the organic combination of elastic connecting elements and damping connecting pads, not only improves the elastic compensation and sealing performance between the rotating and stationary rings but also effectively alleviates the impact load caused by sudden pressure changes or mechanical vibrations.

The utility model relates to a silver ingot weighing buffer device. According to the silver ingot weighing buffer device, electric push rods are arranged on the two sides of a weighing instrument, a lifting table is installed on the electric push rods, a window is formed in the middle of the lifting table and located over the weighing instrument, and connecting rods are installed on the inner sides of the four edges of the window in the middle of the lifting table; the bearing table is installed on the connecting rod and can slide on the connecting rod, the height of the bearing table is larger than the thickness of the lifting table, and when the electric push rod drives the lifting table to descend, the bearing table firstly makes contact with the weighing instrument. According to the scheme provided by the invention, the bearing table can be supported through the electric push rod, the lifting table and the connecting rod, the silver ingot and the bearing table are slowly descended to the weighing instrument through the electric push rod through vibration and impact force generated when the bearing table bears the silver ingot, and the lifting table, the connecting rod and the bearing table are separated to complete weighing; vibration and impact force generated when the silver ingot is placed are effectively isolated, and the problem that impact load directly acts on the sensor is solved.

This invention discloses an impact device and method for simulating primary impact injury from an explosion. The impact device includes: a driving system comprising a driving gas chamber storing high-pressure gas; an experimental system comprising an experimental section cavity with an animal restraint device positioned at its center, the experimental section cavity receiving high-pressure gas from the driving system to apply impact loading to the animal restrained by the animal restraint device; a valve connecting the driving system and the experimental system, the valve's opening time being controlled to regulate the gas pressure within the experimental section cavity (milliseconds); and a throttling valve at the end of the experimental system, the throttling valve's opening angle being set to release the high-pressure gas within the experimental section cavity, thereby achieving the desired shock wave pulse width and waveform. This invention features a simple structure, safe operation, and minimal site requirements; the ideal shock wave pulse width and peak can be set via valve switching and the throttling valve.

The invention belongs to the technical field of pendulum bob tests, and particularly relates to a pendulum bob type lateral impact test device capable of adjusting the impact direction in multiple degrees of freedom, which comprises a base, a mechanical arm mounted on the base, a small arm fixedly mounted at the movable end of the mechanical arm, and a U-shaped frame fixedly arranged at the other end of the small arm, a U-shaped frame is arranged on the upper portion of the arc-shaped track, a chain wheel is rotationally installed in the U-shaped frame, a chain is connected to the chain wheel in a meshed mode, the lower end of the chain is fixedly connected with a pendulum bob, the other end of the chain is wound on a roller of a first winch, and the first winch is fixedly installed on the small arm. The azimuth angle and the pitch angle of the pendulum bob can be quickly and accurately adjusted, so that the pendulum bob can realize repeatable impact loading under different incident angles, different transverse offsets and different spatial orientations, and the target energy level hit rate and the test repeatability are remarkably improved.

The invention provides a biaxial impact loading test device for protrusion-impact composite dynamic disasters, and relates to the technical field of coal rock dynamic disaster tests. Comprising a sealing test cavity, multidirectional static loading devices, one-way impact loading devices, a lateral restraining device, a detachable side wall assembly, a pressure stabilizing type gas supply system and a mechanical driving mechanism, the sealing test cavity is used for loading a sample, and the multidirectional static loading devices are arranged in the X direction and the Z direction of the sealing test cavity respectively. Compared with an existing test device, the device has the advantages that coupling triggering of controllable unloading lateral constraint and impact loading is realized for the first time, so that a coal body failure mode and a gas release process are closer to actual mining conditions; and a high-fidelity and repeatable experiment platform is provided for revealing an inoculation and triggering mechanism of the outburst-impact hybrid dynamic disaster, establishing a risk evaluation index system and calibrating field monitoring and early warning parameters.

The invention provides a device for a composite material stringer skin interface out-of-plane soft body impact test, and relates to the technical field of impact tests, the device for the composite material stringer skin interface out-of-plane soft body impact test comprises an impact loading assembly, a fixed supporting assembly and a clamping assembly; the number of the clamping assemblies is two, and the two clamping assemblies are arranged on the fixed supporting assembly in the first direction in a spaced mode. The clamping assembly comprises a base, a rotating shaft, a lever, a spring and a clamping piece; the base is connected with the fixed supporting assembly. The rotating shaft is rotationally connected with the base and can rotate around the axis of the rotating shaft; one end of the lever sleeves the rotating shaft, and a spring is arranged between the other end of the lever and the base; the clamping piece is detachably connected with the rotating shaft so as to cooperatively clamp a test piece; the impact loading assembly is arranged above the clamping assembly, and the impact loading assembly can apply an out-of-plane impact load to the test piece. The out-of-plane impact loading test of a composite material stringer skin test piece can be realized, and the failure mechanism of a stringer skin interface in the process that a composite material fuselage bears an out-of-plane impact load is studied.

The invention discloses a gas-containing coal dynamic experiment system and method with controllable impact frequency and equivalent weight, and relates to the technical field of coal seam mining, and the gas-containing coal dynamic experiment system comprises an intelligent servo control driving device, a guide rail, a slide rail, a punch carrying device, a spindle-shaped punch, a steel impact gasket, an incident rod, a transmission rod, an absorption rod and a multi-field coupling experiment device, the intelligent servo control driving device intelligently controls a sliding rail installed on the guide rail through program assignment so as to drive the punch carrying device and the spindle-shaped punch in the punch carrying device to do reciprocating motion, the steel impact gasket can be impacted at different impact frequencies and equivalents, and the central axis of the steel impact gasket, the central axis of the incidence rod, the central axis of the transmission rod and the central axis of the absorption rod are collinear. Through the intelligent servo control driving device, the impact loading frequency and the impact equivalent can be automatically adjusted through program control, the preset impact parameters can be output, the accuracy and the consistency of impact loading are improved, and the experiment requirements under different impact conditions are met.

Provided is a frame member for a vehicle that, when an impact load is input, easily absorbs the desired impact load by being uniformly compressed in the axial direction. A vehicle frame member (2) extending in the front-rear direction includes: a frame body portion (20A) having a closed cross section (7a) formed by an upper wall portion (20a), a lower wall portion (20b), and a pair of side wall portions (20c, 20d) in a cross section orthogonal to the extending direction within a predetermined front-rear direction range; groove parts (25, 26) formed by the pair of side wall parts (20c, 20d) which are recessed towards the inner side of the closed cross section (7a); and flanges (20e, 20f) protruding outward from the closed cross-section (7a), the pair of side wall portions (20c, 20d) being provided with a plurality of side wall portions defining the groove portions (25, 26) and having groove upper wall portions (25a, 26a), groove lower wall portions (25b, 26b), and groove bottom wall portions (25c, 26c), and the plurality of side wall portions being formed so that the bending rigidities thereof are substantially equal.

This invention relates to the field of functionally graded materials, specifically to a multidimensional gradient composite material structure and its design method for high-speed impact loading. The composite material structure includes a main body composed of multiple material gradients, a function-controlled outer edge slope, and a bottom high-density layer. By adjusting the side pressure distribution and enhancing the central pressure through the high-density layer, the deformation of the homogeneous material under high-speed loading is effectively reduced, with a maximum deformation ≤0.06mm, and the launch velocity is increased, with a central final velocity ≥13km / s. This invention is applicable to three-stage lightweight gas gun loading technology, providing high-precision data support for protective material research in aerospace and planetary science fields.

The present invention relates to a method for constructing a rock crushing damage model under impact loading and its application, belonging to the field of rock engineering, and solving at least one of the problems of existing rock models in predicting the failure evolution law and / or strength under direct impact loading, namely, insufficient reliability and accuracy, and difficulty in revealing the change law under direct impact loading. The method comprises: S1, based on the wing crack propagation model, obtaining a tension damage model under quasi-static loading; S2, introducing a correction factor to correct the tension damage model under quasi-static loading, and obtaining an expression for the tension damage model under direct impact loading; S3, determining the dynamic fracture toughness of the rock; S4, determining the correction factor; S5, constructing a tension damage model under direct impact loading. The present invention enhances the accuracy and reliability of the model in predicting the strength and failure evolution law of rock under direct impact loading, and the obtained model can reveal the quantitative change law of the damage and destruction of rock under direct impact loading.

The application provides a warship power system reconstruction method suitable for multitask, and relates to the field of warship power system reconstruction under the state of battle damage. The specific method comprises the following steps: 1, combining the importance of loads under different task targets and the power characteristics of the loads, the loads are divided into impact loads, flexible loads and other loads; 2, according to the impact load demand of different tasks, the flexible loads are switched in and out when the impact loads are running to ensure the frequency stability of the warship power system; the constraint condition set of the warship power system under different operation tasks is obtained; 3, the warship power system reconstruction under the state of battle damage is realized by taking into account the constraint condition set. The application considers the dynamic division of the load types under different task targets, and guarantees the safe operation of important loads and the frequency stability of the warship power system under different tasks through switching the flexible loads, so that the warship power system reconstruction suitable for multitask is realized.

The utility model discloses a linear guide rail structure for industrial automatic control equipment, which comprises a linear guide rail main body and a clamping slide block, the clamping slide block is slidably arranged on the front side of the surface of the linear guide rail main body, two sides of the inner cavity of the clamping slide block are respectively provided with a slide groove, the clamping slide block comprises a material base layer, a reinforcing layer and a wear-resistant layer, and the material base layer is provided with a plurality of grooves. The reinforcing layer is arranged on the inner surface of the material base layer, the wear-resistant layer is arranged on the inner surface of the reinforcing layer, the reinforcing layer comprises a composite material layer and a steel alloy layer, and the steel alloy layer is arranged on the outer surface of the composite material layer. Through the arrangement of the reinforcing layer, the clamping sliding block has quite high hardness, abrasion resistance and contact fatigue strength, meanwhile, the core part keeps good toughness and can bear high impact load, the good effect of improving the abrasion resistance of the clamping sliding block is achieved, and the problem that due to the fact that a traditional clamping sliding block is poor in abrasion resistance, when the clamping sliding block is used for a long time, the abrasion resistance of the clamping sliding block is poor is solved. And the clamping sliding block is damaged due to abrasion of the clamping sliding block.

The invention discloses a horizontal flow sedimentation tank impact load mud level prediction method based on CFD simulation modeling, and the method comprises the steps: S1, configuring prediction basic parameters, and dividing a prediction scene; s2, collecting original data, calculating an impact load index after filtering and noise reduction, judging an impact level and generating a normalized input vector; s3, activating and matching an ANFIS grading rule base, and performing fuzzy reasoning to output initial mud position prediction distribution; s4, constructing a self-adaptive grid, executing CFD calculation in combination with an impact grade selective fluid mechanics model, and outputting high-precision mud level data; and S5, generating a dynamic correction factor, correcting the weight of the ANFIS rule and the CFD grid parameters, and outputting a mud position space-time distribution matrix according to a fusion result. The method improves the prediction precision and efficiency under the impact load, enhances the robustness, can support the operation control of the horizontal flow sedimentation tank, and reduces the operation and maintenance cost.

The application discloses a loading control device and method of a triaxial Hopkinson bar impact test, and belongs to the technical field of triaxial impact tests.The application comprises a linear motor, a limiting rod, an end cover, a bullet launching cylinder, an experimental bullet, an air compressor, an air storage tank, a control console, a triaxial Hopkinson bar, a buffer gasket and a gasket clamping plate.The device and method are used in cooperation with the triaxial Hopkinson bar, the limiting mechanism can accurately control and adjust the launching position and acceleration distance of the experimental bullet, so that the acceleration peak value is accurately controlled, and then the corresponding relationship between the driving air pressure, the acceleration distance and the acceleration peak value is obtained through the experiment;the loading control device of the application is matched with the rapid resetting of the experimental bullet, can realize continuous multiple impact loadings with different acceleration peak values, triaxial multiple impact synchronous loadings and automatic single-axis cyclic loadings, and significantly improves the automation degree, the experimental efficiency and the control precision of the triaxial impact loading experiment.

This invention discloses a design and manufacturing method for a uniform cross-section explosive load simulator based on gradient elastic metamaterials, relating to the field of impact loading. Addressing the problems of high cost per use and the susceptibility of variable cross-section elastic rods to local buckling instability under high-speed impact leading to waveform distortion in existing simulators, this invention, while maintaining the macroscopic uniform cross-section shape of the simulator, derives the ideal wave impedance gradient required to achieve the target explosive load based on the one-dimensional elastic wave propagation inverse design theory; establishes the mapping relationship between the relative density of a three-period minimal surface (TPMS) metamaterial unit cell and its equivalent mechanical parameters, and inversely solves the spatial relative density distribution function; extracts the waveform through dynamic impact finite element simulation, and introduces an impedance gradient correction factor to perform nonlinear iterative correction of the density function, obtaining a final three-dimensional metamaterial geometric model that accurately matches the waveform, and uses a flexible polymer material for additive manufacturing. This invention achieves the purely elastic, non-destructive, and reusable simulator, perfectly adapting to the stable firing of light gas cannons, and exhibiting excellent anti-instability capability and waveform fidelity under strong dynamic loads.

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.

The present application relates to bumper detection technical field, specifically to a kind of automobile bumper detection method and system, the automobile bumper detection system includes rigid test bench, multiple-point adjustable impact loading module, bumper surface deformation monitoring module and control and processing module, measured automobile bumper is fixed on test bench according to preset mode, and multiple sensors are arranged based on preset position;According to the control instruction received, the measured automobile bumper is tested for dynamic balance, and corresponding index calculation is carried out;Based on static and dynamic test index, generate quantitative report and automatically determine whether bumper structure balance meets the standard, can effectively simulate the complex static support and dynamic impact working condition that bumper may encounter on a vehicle in an integrated process, and quantitatively evaluate the static stability of its overall structure and the coordination under dynamic impact, so as to more truly reflect the structural safety performance of bumper.

The invention relates to the technical field of rotating shafts, and particularly discloses a rotating shaft structure which comprises a shaft body, a first connecting plate is mounted on the shaft body, the rotating shaft structure further comprises a second connecting plate, and an elastic positioning mechanism is arranged between the shaft body and the first connecting plate; and the shaft body is in transmission connection with the second connecting plate through a buffer guide mechanism. The elastic positioning mechanism is arranged between the first connecting plate and the shaft body, and the buffer guide mechanism is arranged between the shaft body and the second connecting plate, so that when the first connecting plate drives the shaft body to rotate, the second connecting plate can generate controllable relative movement with the shaft body through the buffer guide mechanism; therefore, extra torsion and bending moment generated by asynchronous movement of the two connecting parts due to machining errors, assembly tolerance or long-term use abrasion are effectively absorbed and counteracted, and direct abrasion and impact load of core moving parts in the rotating shaft are reduced to a great extent. And the motion smoothness of the rotating shaft in the whole life cycle is obviously improved.