2944 results about "Impact energy" patented technology

The invention discloses an actuator sealing performance test method and system, particularly relates to the technical field of industrial equipment sealing performance detection, and is used for solving the problem of positioning failure caused by signal aliasing in a multi-leakage scene in an existing method. Pressure attenuation frequency spectrum characteristics and leakage impact frequency spectrum peaks are extracted respectively by pressurizing a sealed cavity and synchronously collecting dynamic pressure and vibration signals; calculating a path loss value based on the amplitude gradient and the propagation time difference, and screening candidate leakage nodes; constructing a space grid model to solve three-dimensional coordinates of the leakage source; after the coordinates are projected to the surface of the structure model, pressure modal coherence and vibration impact energy are coupled and analyzed to generate a detection map; and finally, outputting a multi-leakage-point identification graph through spatial clustering and intensity grading. Accurate separation and spatial positioning of multiple leakage signals are achieved, and the reliability of complex sealing structure detection is remarkably improved.

The invention discloses a 500MPa-grade supercritical CO2 corrosion-resistant pipeline coil plate and a manufacturing method thereof, and the 500MPa-grade supercritical CO2 corrosion-resistant pipeline coil plate comprises the following chemical components: 0.05 to 0.10 percent of C, 0.6 to 0.9 percent of Si, 1.50 to 1.70 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.002 percent of S, 0.10 to 0.30 percent of Cr, 0.35 to 0.45 percent of Mo, 0.03 to 0.05 percent of Nb, 0.01 to 0.03 percent of Ti, 0.02 to 0.05 percent of Al, 0.20 to 0.30 percent of Co, less than or equal to 0.008 percent of N, 1.2 to 4.3 percent of Mo / Cr, 0.75 to 0.92 percent of Mo + Cr + Co, 2.8 to 3.9 percent of Si / Co and the balance of Fe and inevitable elements. The manufacturing method comprises the steps of smelting, slab continuous casting, continuous casting slab heating, rolling, cooling and coiling. In the transverse direction of the rolled plate, Rt0.5 is larger than or equal to 540 MPa, Rm is larger than or equal to 640 MPa, Rt0.5 / Rm is smaller than or equal to 0.87, A50 mm is larger than or equal to 36%,-40 DEG C impact energy KV8 is larger than or equal to 220 J, and-20 DEG C drop weight DWTT is larger than or equal to 95%; in the longitudinal direction, Rt0.5 is larger than or equal to 520 MPa, Rm is larger than or equal to 630 MPa, Rt0.5 / Rm is smaller than or equal to 0.86, and A50mm is larger than or equal to 38%; the average corrosion rate in a 14.5 MPa supercritical CO2 environment is 1t; and 0.05 mm / a. The low-carbon medium-manganese molybdenum-chromium-cobalt-containing alloy design is adopted, the low-temperature toughness of a weld joint is guaranteed, the CO2 corrosion resistance and the oxidation resistance are improved, and higher safety is achieved in pipeline engineering.

The high-steel-grade low-cost hot-rolled coil plate comprises the following chemical components: 0.040 to 0.065 percent of C, 0.20 to 0.35 percent of Si, 1.48 to 1.75 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.003 percent of S, 0.012 to 0.025 percent of Ti, 0.035 to 0.055 percent of Nb, 0.005 to 0.008 percent of RE, 0.15 to 0.20 percent of Cr, 0.0005 to 0.0020 percent of B, 0.002 to 0.004 percent of Mg, 0.025 to 0.050 percent of Als, less than or equal to 0.003 percent of Ca, less than or equal to 0.008 percent of N and the balance of Fe and inevitable impurities. The technological process comprises the steps of smelting, slab continuous casting, slab heating, rolling, cooling and coiling. Rt0.5 of the steel is 580-660 MPa, Rm is 650-750 MPa, A50 mm is larger than or equal to 28%, Rt0.5 / Rm is smaller than or equal to 0.90, the impact energy mean value Akv at the temperature of-40 DEG C is larger than or equal to 200 J, the drop weight DWTT mean value at the temperature of-20 DEG C is larger than or equal to 90%, the hardness value HV10 is smaller than or equal to 220, and the cold bending performance is qualified. The product provided by the invention has high strength and toughness and good welding performance, so that the product is more suitable for various complex and extreme service environments, and has higher safety in pipeline engineering.

The invention discloses a low-cost 450MPa-grade hot-rolled coil plate for a welded pipe and a manufacturing method thereof, and the low-cost 450MPa-grade hot-rolled coil plate comprises the following chemical components: 0.08 to 0.10 percent of C, 0.2 to 0.4 percent of Si, 1.4 to 1.6 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.003 percent of S, 0.01 to 0.03 percent of Ti, 0.020 to 0.040 percent of Nb, 0.003 to 0.005 percent of RE, 0.15 to 0.25 percent of Cr, 0.002 to 0.004 percent of Mg, 0.01 to 0.04 percent of Als, less than or equal to 0.003 percent of Ca, less than or equal to 0.008 percent of N, less than or equal to 0.15 percent of (Nb + Ti + C + N) and the balance of Fe and inevitable elements. The manufacturing method comprises the steps of smelting, slab continuous casting, casting blank heating, rolling, cooling and coiling. The Rt < 0.5 > of the steel is 450-550 MPa, the Rm is 550-650 MPa, the A50mm is larger than or equal to 30%, the ratio of the Rt < 0.5 > to the Rm is smaller than or equal to 0.90, and the impact energy average value Akv at the temperature of-30 DEG C is larger than or equal to 200 J.

The invention provides a method for obtaining the optimal low-temperature impact toughness and a welded body, and the method comprises the following steps: S1, obtaining chemical components of sample steel, and calculating the cooling rate corresponding to the bainite phase change curve nose tip temperature of the sample steel; s2, the cooling rate serves as the key cooling rate of the welding heat cycle process, and the corresponding welding heat input amount is calculated; s3, cutting a plurality of cuboid thermal simulation initial samples of which the length directions are parallel to the rolling direction of the steel plate from the sample steel; s4, two-pass welding thermal simulation cycle experiments at different temperatures are set; s5, two thermocouples are welded to the center of the cuboid thermal simulation initial sample for temperature measurement, and a welding simulation experiment is completed; and S6, size machining is conducted on the welding sample, a low-temperature impact experiment is conducted, impact energy under different technologies is measured, and the optimal impact toughness of CGHAZ and ICCGHAZ is determined. The method can be used for developing and optimizing the welding process with insufficient low-temperature impact toughness of the submerged-arc welding heat affected zone of the low alloy steel.

The invention belongs to the technical field of vibration analysis and testing of bearings, and particularly relates to a cam driven bearing wear degree monitoring method and system, and the method comprises the steps: carrying out the equal-angle resampling processing of a vibration signal through a rotating speed signal, decomposing an obtained angular domain vibration signal into a plurality of mode components through a variational mode decomposition algorithm, and carrying out the measurement of the vibration signal; according to the kurtosis value of each modal component and the correlation coefficient of each modal component and the original vibration signal, evaluating the impact saliency weight of each modal component, and performing weighted summation on the energy of each modal component to obtain comprehensive impact energy; calculating to obtain a speed decoupling wear index without the influence of the rotating speed by utilizing the comprehensive impact energy and the vibration energy calculated by the physical mapping model; and the speed decoupling wear index is compared with a preset self-adaptive alarm threshold value, and the wear state of the cam driven bearing is judged according to a comparison result. According to the invention, the problems of false alarm and missing alarm under the variable-speed working condition are solved.

The invention discloses a novel concrete pavement hardness detection device, and belongs to the technical field of detection. The invention discloses a novel concrete pavement hardness detection device, and belongs to the technical field of road engineering detection. The device comprises a springback tester, an ultrasonic tester and an analysis system, and equipment credibility parameters are generated through a springback confidence model (quantitative impact energy / angular deviation) and an ultrasonic confidence model (quantitative frequency / probe centering error); combining a pavement characteristic model (analyzing water content / temperature / steel bar density) to output an environment adaptation coefficient; further dynamically calculating a springback risk coefficient and an ultrasonic risk coefficient based on a risk model (fused vibration / carbonization depth); and finally, outputting a calibration intensity value through the intensity correction model. The method solves the defects of weak anti-interference capability and insufficient precision of a traditional method, effectively improves the detection efficiency, and is suitable for high-precision scenes such as expressways and airport runways.

The invention relates to the technical field of steel for agricultural machinery, in particular to low-yield-strength impact-resistant steel for a rotary blade of agricultural machinery and a manufacturing method of the low-yield-strength impact-resistant steel. Cr, Nb, B and Re are used for alloying, meanwhile, the technological parameters such as casting blank heating, rough and finish rolling descaling pressure, the rolling temperature, the reduction rate, the coiling temperature and the cooling speed are controlled, and the prepared steel for the agricultural machine rotary blade is low in yield strength and good in punch forming performance; the yield strength of the agricultural machine rotary blade part produced by using the composite material is 300-400MPa, the tensile strength is 700-800MPa, and the ductility is greater than or equal to 18%; after heat treatment, the yield strength is 1400 MPa or above, the tensile strength is 1900 MPa or above, the ductility is larger than or equal to 10%, the impact energy AKv at the temperature of 20 DEG C is larger than or equal to 25 J, the hardness is 53 HRC or above, the wear-resisting life is prolonged by two times or above, and the service life is obviously prolonged.

The invention relates to an impact-resistant chlorinated polyvinyl chloride composite material and a preparation method thereof, and belongs to the technical field of polymer composite materials. The composite material comprises the following components: 100 parts of CPVC resin, 6.5 to 9.5 parts of a modified impact modifier, 2.6 to 3.2 parts of a heat stabilizer, 1.5 to 2 parts of a lubricant, 1.2 to 1.6 parts of a processing aid, 0.2 to 0.25 part of a light stabilizer and 8 to 11 parts of a filler, the modified impact modifier takes a POSS cage structure as a core, a branch chain sequentially contains thioamide-secondary amine-tertiary amine structures, a polarity gradient is formed and fully extends into a macromolecular chain of CPVC to transmit and dissipate impact energy, meanwhile, the amine structure interacts with chlorine groups in a molecular chain of CPVC to form molecular anchoring, expansion of crazes is inhibited, and the impact strength of the CPVC is improved. The continuity and the stability of a bonding interface are maintained, so that the composite material keeps relatively high mechanical strength and thermal stability.

The invention relates to a P690QL2 steel plate with ultrahigh die welding and low-temperature performance and a manufacturing method of the P690QL2 steel plate. The P690QL2 steel plate comprises the following chemical components in percentage by weight: 0.04%-0.12% of C, 0.02%-0.08% of Si, 1.0%-1.2% of Mn, 1.5%-2.5% of Ni, 0.3%-0.7% of Cr, 0.7%-0.9% of Mo, 0.07%-0.12% of V, 0.02%-0.04% of Ti, less than or equal to 0.002% of S, less than or equal to 0.002% of P, 0.03%-0.06% of Als and the balance of Fe and inevitable impurity elements. The steel plate is applied to the liquid cargo tank of the LCO2 transport ship, has high strength and low-temperature toughness requirements, is easy to weld and has ultrahigh die welding performance, the V-type impact energy of the steel plate at-60 DEG C is larger than or equal to 150 J, the CTOD at-55 DEG C is larger than 0.2 mm, and the machining and welding use requirements of pressure-bearing equipment are met.

A lightweight play or training device includes an inflatable bladder and a two-piece molded polymer cover formed by first and second closed-cell foam half-shells fused together (e.g., by ultrasonic welding) along a continuous peripheral seam. The bladder, when unconstrained, is significantly larger than the internal volume of the molded cover so that upon inflation it bunches against the inner surface of the cover, thereby absorbing impact energy and slowing aerodynamic flight. Preferred foams have densities of 20 kg m−3 to 60 kg m−3 and Shore A hardness of 30-60. The device may include an integral inflation tube acting as a one-way valve and an optional elastic tether for solo skills practice. Variants include spherical balls and flying discs, as well as alternative seam geometries and joining techniques.

The invention discloses a 1000MPa-grade steel plate with high toughness, strain aging embrittlement resistance and excellent weldability and a manufacturing method thereof. The 1000MPa-grade steel plate comprises the following components in percentage by weight: 0.09 to 0.13 percent of C, less than or equal to 0.20 percent of Si, 0.70 to 1.00 percent of Mn, less than or equal to 0.013 percent of P, less than or equal to 0.0030 percent of S, 0.15 to 0.40 percent of Cu, 1.50 to 3.00 percent of Ni, 0.45 to 0.70 percent of Cr, 0.40 to 0.65 percent of Mo, 0.040 to 0.070 percent of V, 0.010 to 0.030 percent of Nb, 0.004 to 0.012 percent of Ti, 0.040 to 0.070 percent of Als, 0.0009 to 0.0017 percent of B, less than or equal to 0.0050 percent of N, less than or equal to 0.0030 percent The tensile strength of the steel plate is larger than or equal to 950 MPa, the yield strength is larger than or equal to 890 MPa, the Charpy longitudinal / transverse impact energy (single value) at the temperature of-60 DEG C is larger than or equal to 100 J, the strain aging transverse impact energy (single value) at the temperature of-40 DEG C is larger than or equal to 47 J, the elongation at break delta 5 is larger than or equal to 15%, and the weldability is good (the preheating temperature is smaller than or equal to 150 DEG C, and the steel plate can bear welding heat input of 30 kJ / cm-50 kJ / cm). And the method is particularly suitable for hydropower engineering, ocean platform structures and major equipment manufacturing.

The invention relates to the technical field of intelligent manufacturing, in particular to a chain production data monitoring and optimizing system based on industrial internet of things, which comprises a stress load monitoring module, a shock wave propagation analysis module, a vibration feature extraction module, a load optimization control module and a fracture risk early warning module. According to the method, through combination of stress data acquisition and coordinate index and gradient calculation, a transient stress overload area of chain plate stamping and pin shaft heat treatment is positioned, local extreme points are dynamically screened to improve anomaly detection precision, an energy accumulation coefficient is quantified by shock wave propagation speed and attenuation rate, and a vibration anomaly source of a chain pin shaft and a chain plate is associated. The vibration signals are subjected to short-time Fourier transform to analyze riveting and assembling characteristic frequencies, high-resolution stress mode characteristic values are generated to support parameter optimization, operation data are simulated to construct a stress accumulation curve, test parameters are dynamically adjusted in combination with a short-term stress limit to optimize load uniformity, and an impact energy accumulation value is matched with a safety threshold to calibrate load distribution; the fracture risk is reduced.

The invention discloses an industrial robot motion planning system and method based on artificial intelligence, and belongs to the field of industrial robot intelligent obstacle avoidance. Based on a visual sensor, a depth sensor and a material priori library, feature extraction and attribute judgment are performed on an obstacle, and the risk is preliminarily evaluated; based on a force control sensor at the tail end of the robot and low-speed contact motion, contact force and displacement curve changes are obtained, the deformable characteristic of an obstacle is evaluated, and based on a deformation potential value, contact force and displacement curve analysis, contact stress calculation and obstacle energy absorption calculation, the damage risk of the obstacle is evaluated. The contact impact energy and the damage coefficient of the robot are evaluated based on the quality, the running speed and the anti-seismic coefficient of the industrial robot, the danger of the robot facing the obstacle is comprehensively evaluated based on the obstacle initial judgment risk, the damage probability and the robot damage coefficient, and the working efficiency and safety of the industrial robot are improved.

The invention discloses a ship equipment vibration test method and system based on frequency domain kurtosis mapping and non-Gaussian signal generation. The ship equipment vibration test method comprises the following steps: collecting an actual ship impact vibration signal and extracting a target power spectral density curve; the method comprises the following steps: identifying an impact energy concentration frequency band based on spectrum energy distribution, carrying out frequency band division by adopting an elliptical filter bank with a second-order section structure, and calculating an envelope kurtosis value of each frequency band to establish a kurtosis-frequency mapping model; after the initial Gaussian driving signal is generated, a non-Gaussian driving signal is generated through a phase randomization and amplitude dynamic scaling algorithm based on a mapping model; a multi-target optimization controller based on Pareto leading edge search is adopted, a power spectral density error and a kurtosis error are taken as optimization targets, synchronous optimization is carried out through fast non-dominated sorting and an adaptive hybrid variation strategy, and a driving signal is output. According to the invention, the broadband and non-Gaussian impact vibration environment of the ship equipment in the actual severe sea condition can be reproduced in a high-fidelity manner, and the authenticity of the test and the fault mode coverage capability are remarkably improved.

The invention discloses multi-scale toughened concrete and a preparation method thereof, and belongs to the technical field of high leakage, and the multi-scale toughened concrete comprises aluminoferrite cement, a low-shrinkage auxiliary cementing material, a water reducing agent, multi-scale composite fibers, a shrinkage compensation agent, fine aggregate, coarse aggregate and water. A traditional toughening mode is broken through, a physical-chemical composite connection interface is established through a magnetron sputtering metal gradient coating of crude fibers and a laser-induced dendritic crystal structure, a strain hysteresis effect is triggered under an impact load, impact energy is converted into interface phase change energy, and a high-efficiency energy dissipation channel is formed; an amino functional group and free radical cross-linked network is introduced into the fine fibers, and the fibers are endowed with microcosmic dynamic enhancement capability in combination with directional arrangement of the carbon nanotubes, so that the concrete forms cooperative interaction between macroscopic crack bridging and microcosmic crack inhibition, the crack resistance under complex stress is remarkably improved, and microcrack propagation is effectively inhibited.

The present invention relates to a fatigue-resistant and corrosion-resistant 500 MPa-grade steel plate for marine wind power, the chemical composition of which is as follows, by mass percentage: C: 0.10%-0.12%, Si: 0.20%-0.30%, Mn: 1.20%-1.40%, P≤0.010%, S≤0.005%, Nb: 0.030%-0.040%, Ti: 0.018%-0.030%, Ni: 0.28%-0.38%, Cu: 0.35%-0.55%, Al: 0.020%-0.050%, Pcm being controlled to be ≤0.25%, and the remainder being Fe and unavoidable impurity elements. The 500 MPa-grade steel plate for marine wind power of the present invention is produced using a TMCP+tempering process, and has a thickness of 30 mm-60 mm, a yield strength of ≥500 MPa, a tensile strength of 600-760 MPa, an elongation after fracture of ≥17%, and a core impact energy of ≥120 J at -30℃. Corrosion resistance is improved by 50% or more compared with conventional 355 MPa-grade steel plate for marine wind power. After the steel plate is welded by submerged arc welding with a heat input of ≥35 kJ / cm, the tensile strength of the welded joint is ≥600 MPa, and the impact energy at -30℃ is ≥80 J; under conditions of a stress ratio of 0.5, the fatigue limit of a welded joint after 107 cycles of axial loading is ≥450 MPa. The steel has the characteristics of high strength, fatigue resistance, corrosion resistance and easy welding, and can meet the development requirements of safe service, high strength and light weight for marine wind power facilities.

The invention relates to the technical field of elevator buffers, in particular to a spring damping device for an elevator buffer, which comprises a vertically arranged damping shock absorber, the top of the damping shock absorber is connected with a movable plate, a main buffer spring is connected between the movable plate and the damping shock absorber, and the movable plate is movably connected with a driving plate. The lower portion of the driving plate is connected with a movable pin assembly extruding towards one side of the movable plate, the lower surface of the movable pin assembly is connected with an impact transmission assembly, and the lower portion of the damping shock absorber is connected with a standby buffering unit. A main buffer spring and a standby buffer unit are arranged, under the normal condition, the main buffer spring absorbs impact energy, and the elevator falling speed is reduced; when the main buffer spring is broken, the movable pin assembly drives the impact transmission assembly to be connected with the standby buffer unit in a clamped mode, the standby buffer unit is started to work, a lift car or a counterweight is prevented from directly impacting the bottom of a hoistway, and double guarantees are provided for safety of passengers and equipment.

The invention provides a vehicle control method and a vehicle, the method is applied to the technical field of vehicle safety, and the method comprises the following steps: obtaining a planned driving track of a target vehicle; on the basis of the planned driving track and the planned driving track of the current vehicle, under the condition that it is determined that the target vehicle will collide with the current vehicle, the collision time of the target vehicle and the current vehicle is calculated, and the minimum lateral collision avoidance distance for collision avoidance is calculated; and matching a protection action of the current vehicle according to the collision time and the minimum lateral collision avoidance distance, and executing the protection action before collision with the target vehicle. The method solves the problems that an existing collision early warning system cannot dynamically adjust the vehicle posture in a short time, a traditional chassis system cannot cooperate with a steering and suspension system to disperse impact energy before collision, the height of a vehicle is fixed, the living space of a passenger compartment is compressed, collision avoidance is difficult to achieve, and the safety is high. And the living space of the passengers cannot be optimized during unavoidable collision.

The invention relates to the technical field of low-temperature studs and bolts, and discloses a low-temperature stud steel hardenability optimization treatment method which comprises the steps of S1, a pretreatment method, S2, quenching method optimization, S3, tempering method optimization, S4, a post-treatment method and S5, a performance verification method. According to the method, the low-temperature impact stability is remarkably improved, the low-temperature impact energy of the material at about-100 DEG C can stably reach 35 J or above by accurately controlling the proportion of alloy elements and optimizing the heat treatment process (for example, the tempering temperature is increased to 640 DEG C or above and the heat preservation time is prolonged), the low-temperature impact energy is improved by about 20%-30% compared with a traditional process, and the problem that the low-temperature impact performance of the wire rod fluctuates is thoroughly solved; and the service safety in a low-temperature environment is ensured.

The invention discloses an ultralight high-impact-resistance photovoltaic module based on a 3D reticular reinforced structure and a preparation method thereof. The problem of contradiction between light weight and impact resistance of a traditional module is solved through a three-layer collaborative innovative design. According to the gradient enhanced front plate of the photovoltaic module, the PC layers and the ETFE layers are alternately laminated, and the 3D spiral gradient glass fiber net is embedded in the gradient enhanced front plate, so that the gradient dispersion of impact stress is realized, and the impact resistance of the edge is improved; the aramid fiber reinforced adhesive film layer wraps the battery piece, absorbs impact energy and inhibits crack propagation; the bionic honeycomb backboard is composed of a Nomex honeycomb core and a carbon fiber surface layer, and unloading is achieved through a honeycomb structure. Compared with an existing photovoltaic module, the ultralight high-impact-resistance photovoltaic module has higher light transmittance and more excellent impact resistance, the hygrothermal aging light transmittance is only reduced by 0.23%, and the ultralight high-impact-resistance photovoltaic module has ultrahigh impact resistance under the ultralight condition that the surface density is smaller than or equal to 4 kg / m.

The utility model discloses an automobile interior trim injection molding part with a buffer structure, which relates to the technical field of automobile accessories and particularly comprises a thick-sheet interior trim part, a corresponding part is arranged on one side of the upper surface of the thick-sheet interior trim part, a corresponding groove is formed in the bottom of the thick-sheet interior trim part of the corresponding part, an arched part is arranged on one side, close to the corresponding part, of the thick-sheet interior trim part, and the arched part is connected with the thick-sheet interior trim part. The upper surface of the arched part is provided with a through hole, one side of the arched part is provided with a connecting hole, the inner arc surface of the arched part is fixedly provided with a supporting piece, the top of the upper surface of the supporting piece is provided with a protruding end, and impact energy is absorbed through deformation of a spring on an elastic piece; according to the anti-collision beam, the elastic part is arranged on the anti-collision beam structure, so that the shape of the anti-collision beam is easily changed in the whole anti-collision beam structure, impact energy can be absorbed by the elastic part firstly, the energy is prevented from being transmitted to other parts, damage to the other parts is prevented, the driving safety is improved, and the maintenance cost after collision is reduced.

The invention belongs to the technical field of connectors, and particularly relates to an electric tricycle wire harness connecting structure. Comprising a butt joint piece which is divided into a connector A and a connector B which are oppositely arranged in a butt joint mode. A positioning damping device is arranged on the joint A; the two positioning square blocks are respectively mounted at the top and the bottom of the joint B; the positioning damping device comprises two positioning square boxes, and the positions of the positioning square boxes correspond to those of the positioning square blocks; openings of the two U-shaped pipelines are oppositely arranged and located on the two sides of the connector A correspondingly. The two ends of the U-shaped pipeline face the two positioning square boxes correspondingly, and auxiliary square columns are slidably connected into the U-shaped pipeline. Therefore, the service life of the connector, namely the butt joint piece, is prolonged, the stability of electrical connection is improved, the phenomena of heavy butt joint and light protection during use of the wire harness connecting structure are avoided, the butt joint piece is effectively protected, impact energy such as vibration and shaking during use can be absorbed by the buffer performance, and the service life of the connector is prolonged. Therefore, the limitation of the structure in use is reduced.

The invention discloses a reinforcing device before dangerous rock removal and treatment, which comprises at least two pairs of fixed anchor rods, the two pairs of fixed anchor rods are arranged in a matrix, the two pairs of fixed anchor rods are embedded in dangerous rock, the two pairs of fixed anchor rods are externally connected with a protective net, and the reinforcing device further comprises a pair of traction anchor rods arranged between the two pairs of fixed anchor rods. The invention relates to the technical field of dangerous rock reinforcement, the drilling, cooling and grouting functions are integrated through the hollow anchor rod, and the rock mass damage risk is reduced through single-point construction; the flexible connection system can effectively resolve the rock mass displacement stress; a gapless interception system is formed by the double-layer structure of the protective net and the blocking net, and falling stone impact energy is dissipated by the hydraulic buffer device in a grading manner; according to the design of the split type positioning hanging rings and the quick-release pins, modularized quick replacement of the protective net is achieved, the construction complexity is reduced through the standardized anchor rod assembly, the requirement for the number of anchoring points is reduced through cooperative bearing of the traction anchor rods and the fixed anchor rods, and the dangerous rock reinforcing safety and the construction efficiency are remarkably improved.

The invention relates to the technical field of computer hard disk fixing, in particular to a computer hard disk physical protection device based on impact absorption and a notebook computer, the computer hard disk physical protection device is used for installing a hard disk in a computer hard disk installation bin and is composed of a fixed frame connected with the installation bin and a movable frame connected with the hard disk, and the movable frame comprises an elastic connecting plate and a fixed connecting plate; the elastic connecting plate is elastically connected with the fixing frame, the fixed connecting plate is rigidly connected with the hard disk, an overload protection mechanism is arranged between the elastic connecting plate and the fixed connecting plate, when normal, the elastic connection of the elastic connecting plate and the fixing frame can effectively damp the hard disk under conventional impact, and damping structural components are reduced through matching of the positioning pin and the notch; when the movable frame bears a load hyperelastic threshold value, the overload protection mechanism is triggered, a force transmission path between the elastic connecting plate and the fixed connecting plate is cut off, unattenuated impact energy is prevented from being transmitted to the hard disk through a rigid component, mechanical damage or data loss caused by overload impact of the hard disk is effectively avoided, and the safety and stability of the hard disk are improved.

The invention discloses a cofferdam device for hydraulic engineering construction and an operation method thereof.The device comprises a cofferdam, buffering mechanisms arranged on the periphery of the exterior of the cofferdam, reinforcing mechanisms arranged on the periphery of the exterior of the cofferdam and driving control mechanisms arranged at the four corners of the cofferdam, and the cofferdam is composed of supporting columns and steel plates and forms a rectangular frame structure; the reinforcing mechanism is connected with a first fixing block and a second fixing block through a reinforcing rod to enhance the stability of the cofferdam, the driving control mechanism is composed of a forward and reverse motor, a sliding groove, a threaded rod and a sliding block and can automatically adjust the position of the buffering mechanism according to the change of the water level, and the buffering mechanism comprises a supporting rod, an arc-shaped first elastic plate, an arc-shaped second elastic plate and a first damper. Impact energy is absorbed through elastic deformation and damping force, and the cofferdam is protected against impact of water flow and floating objects. The position of the buffer mechanism can be automatically adjusted according to the water level condition, and it is ensured that the buffer mechanism is located at the optimal working position all the time so as to meet the buffer requirements under different water level conditions.

The invention relates to 500MPa-grade preheating-free welding structural steel and a preparation method thereof, belongs to the technical field of structural steel, and solves the problems that in the prior art, traditional structural steel is poor in welding performance, high in carbon equivalent, high in cold crack sensitivity and difficult to consider both high strength and good plasticity. The structural steel comprises the following chemical components in percentage by weight: less than 0.002% of C, less than 0.02% of Si, less than 0.03% of Mn, 1.5-2.0% of Ni, 1.5-2.0% of Cu, less than 0.0008% of S, less than 0.006% of P and the balance of Fe and inevitable impurities, wherein the carbon equivalent Ceq is less than or equal to 0.27. The combination of high strength (the yield strength is larger than or equal to 550 MPa, and the tensile strength is larger than or equal to 650 MPa), excellent welding performance (Pcm is smaller than or equal to 0.14), good plasticity (the percentage elongation after fracture is larger than or equal to 25%, and excellent low-temperature toughness (the impact energy at the temperature of-20 DEG C is larger than or equal to 200 J) is achieved, and the steel is suitable for the structural fields of ships, bridges, buildings and the like with strict requirements for welding performance and mechanical performance.

The present application relates to a kind of large thickness submarine pipeline steel plate and its production method, by the optimization design steel plate component of low-carbon low-alloy component, production method is with the special controlled rolling process of five-stage heating+recrystallization zone low temperature large reduction rolling+intermediate billet instant cooling+non-recrystallization zone high temperature large reduction rolling, and the multi-stage controlled cooling process of high temperature zone air cooling redistribution+ferrite zone cooling+waiting temperature+bainite zone cooling+air cooling self tempering cooling.The product steel plate of the present application has higher acicular ferrite proportion, and the average grain size of ferrite is finer, 3~6 μm, so that the steel plate has good strength and toughness match, the steel plate has higher strength, yield strength ≥500MPa, tensile strength ≥630MPa, and impact energy KV2 At-60 ℃, ≥250J.

The invention discloses a sandwich structure based on chiral pressure torsion and negative poisson ratio honeycomb compounding, and relates to the technical field of mechanical metamaterials. The sandwich structure comprises an upper skin layer, a core layer and a lower skin layer, the core layer is formed by alternately compounding three-dimensional chiral compression-torsion cell elements and negative poisson ratio honeycomb cell elements which are periodically arranged, and the chiral compression-torsion cell elements form a bidirectional torsion stress network through spiral connecting rods; the negative Poisson's ratio honeycomb cell element is of a concave polyhedron structure and is nested with a butterfly-like substructure, and energy is absorbed through transverse contraction and folding deformation in a cooperative mode. The sandwich structure has a multi-stage energy dissipation mechanism: the chiral compression-torsion unit disperses impact energy through spiral deformation, the butterfly-like substructure elastically shrinks at low strain and slides and folds at high strain, and the energy absorption efficiency is enhanced through friction and plastic deformation; the structural parameters can be subjected to gradient regulation and control according to the impact strength, the lightweight rate and the deformation mode, and high design flexibility and working condition adaptability are achieved.

The invention provides a multi-parameter-based offshore piling underwater sound source level prediction method and device.According to the method, multiple sets of historical monitoring data are obtained, each set of historical monitoring data comprises multi-parameter information and a corresponding single impact sound exposure level, and the multi-parameter information comprises impact energy, hammer weight, pile diameter and water depth; establishing a prediction relation model according to the multiple groups of historical monitoring data; and acquiring multi-parameter information corresponding to the single impact sound exposure level of the to-be-predicted project, and substituting the multi-parameter information into the prediction relation model to obtain the single impact sound exposure level of the to-be-predicted project, so that the impact energy, hammer weight, pile diameter and water depth of the to-be-predicted project, which are easy to acquire, are input, and the single impact sound exposure level of the to-be-predicted project is obtained. And the calculation is simple and convenient, so that the sound source level of the underwater noise generated by piling can be quickly predicted in the early stage of a project.