105 results about "Dynamic strength" patented technology

Methods and systems for managing communication between a key fob and a host device are provided. In one implementation, the system includes a key fob configured to operate in accordance with one of a plurality of modes, including an automatic mode and a manual mode. The system further includes a host device associated with the key fob, wherein responsive to the key fob operating in accordance with the automatic mode, the key fob is configured to page periodically, and the host device is configured to page-scan periodically to detect a page from the key fob. In one implementation, the key fob further includes a controller configured to dynamically adjust a signal strength of a communication signal between the key fob and the host device in accordance with a mode of operation selected (or desired) by the user.

The invention relates to a preparation method of an Al/W/PTFE energetic material and belongs to the field of energetic materials. The preparation method orderly comprises raw material powder preparation, surface modification, mixed powder drying, compression molding and sintering molding. The preparation method utilizes conventional Al, W and PTFE powder as raw materials which are easily purchased and have a low cost. The preparation method has simple processes and a low cost and is suitable for batch production. Compared with the traditional Al/PTFE energetic material (Al: 26.4wt% and PTFE: 73.6wt%), the Al/W/PTFE energetic material obtained by the preparation method has higher compressive strength, density and reaction threshold. When a mass fraction of W of the energetic material is 60%, compared with the traditional Al/PTFE energetic material, the Al/W/PTFE energetic material improves density by 88%, dynamic strength limit by 21% and a reaction threshold by 24%.

The invention discloses a method for reducing the weight of vehicle, based on the structural strength variable character. It comprises: 1, via strength calculation or test to get the strength change in constant load; 2, via the dynamic strength increase matrix of structure, attaining the critical load; 3, processing structure finite analysis on the structure, calculating the stress in critical load; 4, fixing the stress of weight reduced structure and designing relative structure. With said invention, the structure can attain longer service life and reduce weight. Said invention has high reliability and operational property. Since, there is not strength test on the sample; the user can calculate the strength increase in the sample load according to the lower-load strength character of structure, to calculate the critical load, to realize weight-reduced structure.

An Al/Cu/Mg/Mn alloy for the production of semi-finished products with high static and dynamic strength properties has the following composition: 0.3-0.7 wt % silicon (Si), max. 0.15 wt. % iron (Fe), 3.5-4.5 wt % copper (Cu), 0.1-0.5 wt. % manganese (Mn), 0.3-0.8 wt. % magnesium (Mg), 0.5-0.15 wt % titanium (Ti), 0.1-0.25 wt % zirconium (Zr), 0.3-0.7 wt. % silver (Ag), max. 0.05 wt. % others individually, max 0.15 wt. % others globally, the remaining wt. % aluminum (Al). The invention further relates to a semi-finished product made for such an alloy and a method of production of a semi-finished product made for such an alloy.

A method for preparing a soft magnetic composite material through hot pressing includes the following steps: dispersing particle soft magnetic powder into a dispersing medium, adding a coupling agent to conduct surface processing, conducting separation to obtain magnetic powder wrapping the coupling agent, conducting washing and drying through absolute ethyl alcohol to obtain the coupling agent modified magnetic powder, mixing the epoxy resin and an epoxy hardener to obtain an epoxy resin system mixture, mixing the coupling agent modified magnetic powder and the epoxy resin system mixture according to the proportion to obtain mixed slurry containing the magnetic powder and the epoxy resin system mixture, pouring the mixed slurry into a container, conducting vacuumizing, arranging the container into a constant temperature oven to conduct procuring to obtain composite slurry obtained through procuring, transferring the procured composite slurry into a mould, and conducting solidification and die pressing through a hog pressing machine to obtain the soft magnetic composite material. The method is simple in process, low in cost, favorable for operation and capable of achieving good magnetic performance and dynamic strength of the composite material by adjusting the content of the magnetic powder. The shape is controllable, and the mechanical performance is good.

The invention belongs to the technical field of testing simulation, and provides a method for obtaining circumferential load distribution of a friction plate tooth part through variable-contact-rigidity testing. The method aims at carrying out testing on static stress on the friction element tooth part, accordingly achieving mutual verification of two distribution rule testing results, and providing theoretical supports for dynamic strength simulation and design of a friction element. According to the method, the mass data synchronous collecting problem difficult to solve can be solved, middle testing links and a data processing link are omitted, the distribution characteristics of circumferential loads of the friction plate tooth part can be directly obtained through a variable-contact-rigidity curve obtained through the testing, and the accuracy of the testing results is improved; the testing method is simple, practical and high in testing result accuracy.

A high strength reinforcing bar splice uses a contractible jaw assembly bridging the bar ends to be joined. The jaw assembly includes interior teeth designed to bite into the projecting ribs or deformations on the outside of the bar ends which form the overall diameter of the bar but not the core or nominal diameter of the bar. The jaw assembly is constricted from both axial ends by driving tapered locking collars on each end of the jaw assembly with a tool while concurrently causing the jaw assembly to constrict and bite into the bar ends. When the tool is removed, the collars remain in place locking the jaw assembly closed. The splice provides not only high tensile and compressive strengths but also has good fatigue and dynamic strength to qualify as a Type 2 coupler.

A heat-resistant Al-Cu-Mg-Ag alloy for producing semifinished parts or products, which is suitable for use at elevated temperatures and has good static and dynamic strength properties combined with an improved creep resistance and comprises: 0.3-0.7% by weight of silicon (Si), not more than 0.15% by weight of iron (Fe), 3.5-4.7% by weight of copper (Cu), 0.05-0.5% by weight of manganese (Mn), 0.3-0.9% by weight of magnesium (Mg), 0.02-0.15% by weight of titanium (Ti), 0.03-0.25% by weight of zirconium (Zr), 0.1-0.7% by weight of silver (Ag), 0.03-0.5% by weight of scandium (Sc), 0.03-0.2% by weight of vanadium (V), not more than 0.05% by weight of others, individually, not more than 0.15% by weight of others, total, balance aluminium, is described. A process for producing a semifinished part or product composed of the abovementioned aluminium alloy is also described.

The invention provides a vehicle body dynamic strength analysis method, comprising the following steps: a, simultaneously measure the acceleration information of a solid wheel center and the acceleration and strain information at key points on the vehicle body; b, taking the acceleration information at the solid wheel center as the external load input information of a simulation model, and then simulating the acceleration and strain results of the key points on the vehicle body based on the external load input information; c, comparing the actually measured acceleration and strain information of the key points on the vehicle body with the simulation result; d, adjusting the simulation model based on the comparison result; and e, through the adjusted simulation model, obtaining the stress and strain information of each component of the complete vehicle and carrying out fatigue life analysis on the components.

The invention belongs to the technical field of spacecraft structures, and relates to an allowance test assessment method for a detonation fuse separation device, and specifically relates to a test method for comprehensively assessing separating property allowance and structure dynamic strength margin of a mild detonation fuse separation device. The method uses a mild detonation fuse which contains 120% design explosive quantity to perform the structure dynamic strength margin test, so as to assess the anti-explosion impact property of residual structures of a protective cover and a separation ring under high explosive quantity, and ensure integrity of the structures. A test sample whose centering deviation is relatively large is used, and a mild detonation fuse in 67% design explosive quantity is used to perform a separating property allowance test, so as to assess low explosive quantity separation reliability in centering deviation. The method can fully verify the separating property allowance and structure dynamic strength margin of the mild detonation fuse separation device.

A method for rigidity enhancement and weight reduction using laser peening, includes the following steps: determining a limit size of a component; performing laser peening strengthening test on the component, and setting multiple groups of strengthening parameters; performing material performance test on the component, and acquiring material performance improvement data; determining a topological optimization strengthening region; optimizing the cross-sectional size of the component according to the material performance improvement data; and estimating static/dynamic strength, rigidity, bearing capacity and reliability indexes of the optimized component, judging whether design requirements are met or not, and repeating the step of determining the topological optimization strengthening region if NO, or completing the design of the component if YES.

The invention discloses a high-density high-toughness kinetic energy ultra-high-strength tungsten-nickel alloy, belongs to the field of heat-resisting alloys, and in particular relates to a high-density kinetic energy ultra-high-strength tungsten-nickel heat-resisting alloy. The high-density kinetic energy ultra-high-strength tungsten-nickel heat-resisting alloy comprises the following chemical compositions in percentage by weight: 50-80% of Ni, 20-40% of W, 0-3% of Ti, 0-3% of Al, 0-8% of Nb and the balance of other inevitable impurity elements and micro elements such as rare earth. A preparation method of the high-density kinetic energy ultra-high-strength tungsten-nickel heat-resisting alloy adopts the following processes: vacuum induction and vacuum self-consuming remelting or electro-slag remelting. Compared with the prior art, the high-density kinetic energy ultra-high-strength tungsten-nickel heat-resisting alloy disclosed by the invention has excellent comprehensive performance and excellent properties such as high density, high toughness, ultra-high strength and ultra-high dynamic strength, and ensures that the density can reach 9.0-13.0g/cm<3>, the impact toughness can reach more than 100J/cm<2>, the static tensile strength can reach more than 1350MPa, and the dynamic compressive strength can reach more than 1900MPa.

The invention discloses an in-trench water-stone separation siphoning-drainage debris flow control method. A series of permeable pipes are disposed in a trench in an area for formation or passage of debris flow, and drain siphons are connected to downstream ends of the permeable pipes. When the water level of rain flood reaches the siphoning level, water permeating into the permeable pipes is drained to the downstream safety trench through the drain siphons so that dynamic strength of the water in the trench is reduced. Using the method can effectively control formation and passage of debris flow and solve treatment methods for debris flow trenches on different scales, and control engineering is simple in construction and high in adaptability. Gravity flow is converted into full in-pipe flow under the action of siphoning drainage, and drainage efficiency is improved. Pipe sedimentation can be prevented under the suction action of siphoning. Diverted drainage in the case of high water level has low impact on the hydrological environment of the trench.

The present invention discloses a multi-target-proportion vehicle body vibration characteristic comprehensive test platform which comprises the following components: a proportion vehicle body, a computer, a data acquisition device, a power amplifier, various kinds of sensors, a test platform underframe, etc. Two ends of the test platform underframe are provided with a hoisting frame which facilitates proportion vehicle height adjustment, a middle hoisting frame which can move bidirectionally, and a plurality of vibration exciter mounting frames, thereby realizing single/multiple point excited modal test and analysis. The multi-target-proportion vehicle body vibration characteristic comprehensive test platform can realize equivalent research for dynamic strength and dynamic stiffness of proportion vehicle body structures of different rail vehicles. Furthermore through modal parameter identification technique and acquired excited and responded load time history, a structure frequency response function is acquired by means of modern digital signal processing technique, and a physical parameter model of the structure system is acquired. Furthermore load identification and sensitivity analysis are performed on the structure physical parameter for realizing identification and optimization for the structure parameter. Furthermore the test platform underframe of the invention has a small structure size and greatly reduces cost of the structure modal test.

The present invention provides a self-repairing material having self-repairing properties and shape memory properties, as well as high dynamic strength, and also provides a method for manufacturing the same. The self-repairing material of the present invention comprises a polymer comprising specific monomer units in specific ratios, and the concentration of the monomer units is within a specific range.

The invention discloses double-phase high-density kinetic energy tungsten-nickel-cobalt alloy capable of being cast and forged and a preparation method, and belongs to the field of kinetic energy alloy. The double-phase high-density kinetic energy tungsten-nickel-cobalt alloy comprises, by weight, 35-65% of W, 0-3% of Ti, 0-3% of Al, 0-8% of Nb, 0-10% of Ta and the balance Ni or Co or NiCo, unavoidable impurity elements and micro elements like rare earth. The preparation method adopts vacuum induction plus vacuum arc remelting. Compared with the prior art, the double-phase high-density kinetic energy tungsten-nickel-cobalt alloy capable of being cast and forged is good in comprehensive performance, has high density, high rigidity, super high strength, super high dynamic strength and other excellent properties, the density can reach 11.0-15.0 g/cm<3>, the impact rigidity can reach 80 J/cm<2> or higher, the static tensile strength can reach 1300 MPa or higher, and the dynamic compression strength can reach 1800 MPa or higher.

A portable work capacities testing apparatus, and a method using that portable apparatus, are disclosed. The apparatus comprises a host computer 110, a dynamic strength and lifting device 120 releaseably interconnected with the host computer, a hand grip strength device 130 releaseably interconnected with the host computer, a finger pinch strength device 140 releaseably interconnected with the host computer, a forearm/wrist strength device 150 releaseably interconnected with the host computer, a handling/proprioception device 190 releaseably interconnected with the host computer, a finger flexion device 180 releaseably interconnected with the host computer, a whole body coordination device 170 releaseably interconnected with the host computer, and a strength push/pull/lift device 160 releaseably interconnected with the host computer.

The invention discloses a method for casting and producing glass mould roughcast by a V-process molding process. The method comprises the following processes: casting glass mould roughcast by adopting a heat-resistant alloy cast iron material; assembling aluminum alloy mould cores on replaceable mould board cores and finishing the cores; respectively placing replaceable mould board cores in an upper sand box and a lower sand box of a vacuum sand box; carrying out film laminating; carrying out film roasting; carrying out vacuum pouring; carrying out thermal treatment, and the like. According to the method, the mould roughcast, with a D-type graphite form in a roughcast inner cavity part and A-type graphite forms in other roughcast outer parts, is obtained by methods of carrying out process control and boiler-front inoculation treatment, adding alloy elements such as Mo, V, Ti, Cr, Cu and Al, adopting chilled iron cores and the like. The A-type graphite form structure has good static and dynamic strength, higher thermal conductivity and stable processing performances; the D-type graphite form structure has better compactness and higher tensile strength, and is remarkably improved in wear resistance, heat resistance, oxidization resistance and thermal fatigue resistance; and the mould roughcast with different graphite-form structures on key parts is glass mould roughcast which is most suitable for a glass bottle tank forming process.

The invention discloses a wet copper base friction material and preparing method, which is composed of three-dimensional, interconnect network carborundum ceramic skeleton, copper alloy and other inorganic fillers, wherein the bulk percentage of copper alloy is 60-70 vol. percent; the bulk percentage of network carborundum ceramic skeleton and inorganic filler is 40-30 vol. percent. The fusing high-temperature liquid alloy is squeezed in the three-dimensional network carborundum ceramic skeleton of inorganic filler under pressure, which possesses high dynamic strength. The invention can be applied in large power; high speed wet friction driving and braking device.

A belt as an endless traction device for conveyor belts of agricultural machines, the belt being made of a polymer that is reinforced by fabric plies. Endless belt provides a conveyor belt of this type which has high static and dynamic strength at the connecting point, combined with great bending flexibility. This is achieved in that at least one fabric ply of each belt end, folded back on itself, wraps around a thickened area and extends between the thickened area and a stop, which forms an abutment with respect to the thickened area, in such a way that the fabric ply is jammed between the thickened area and the stop when tension acts on the belt in the reverse direction.

A testing method and apparatus for ground liquefaction and dynamic characteristics in the original position utilizing a boring hole, wherein the dynamic strength and deformation characteristics of a soil layer against a dynamic repetitive load, in an optional position in the ground can be obtained by a simple method. A measuring cell based on a three-chamber construction is used, and upper and lower soil layers (J1, J3) with an intermediate soil layer (J2) therebetween are alternately subjected to a dynamic repetitive load, and what influence there is on the intermediate soil layer (J2) is investigated from the relation between pressure and displacement.

A chromatic point sensor (CPS) system is provided, which compensates for potential errors due to input spectral profile intensity inconsistencies that arise when driving a CPS illumination source using different power levels. The CPS system includes an optical pen comprising a confocal optical path including a chromatically dispersive element and configured to focus different wavelengths at different distances proximate to a workpiece surface to be measured, an illumination source, and CPS electronics. The CPS electronics include: an illumination source control portion configured to drive the illumination source using different power levels; a CPS wavelength detector comprising a plurality of pixels distributed along a measurement axis of the CPS wavelength detector to provide output spectral profile data; and a power level spectral compensation portion configured to compensate the output spectral profile data to remove or reduce potential errors due to input spectral profile intensity inconsistencies that arise when driving the CPS illumination source using the different power levels.

A portable work capacities testing apparatus comprising a portable computer, a hub releaseably interconnected with the portable computer, a dynamic strength and lifting device releaseably interconnected with the hub, a hand grip strength device releaseably interconnected with the hub, a finger pinch strength device releaseably interconnected with the hub, a forearm/wrist strength device releaseably interconnected with the hub, a handling/proprioception device releaseably interconnected with the hub, a finger flexion device releaseably interconnected with the hub, a whole body coordination device releaseably interconnected with the hub, and a strength push/pull/lift device releaseably interconnected with the hub.

The invention relates to a method for testing a soil constitutive relation and a dynamic strength parameter. The method comprises the following steps of: placing a soil sample in a dynamic triaxial test machine and consolidating; determining vibration frequency, vibration wave type, vibration times and applied external force; applying continuously-increased external force for vibrating; keeping in the same vibration times; stopping testing while straining to reach some degree (5 to 8% in general); processing the last three vibrations under the same dynamic stress; averaging the strains; drawing a relation curve with the dynamic stress and dynamic strain serving as the coordinates under the same coordinate system; arranging strength indexes according to a total stress way; calculating the corresponding main stress under such power condition; drawing a total stress morh stress circle for the dynamic strength; drawing the stress circles under different confining pressures in the same coordinate; calculating a common tangent of the three circles; and determining a vertical intercept and a gradient which are respectively the dynamic cohesive force and dynamic friction angle under a power condition. The method is simple and accurate in result, greatly simplifies the workload of the test, and is the best choice for the engineering test with requirement on time.

A structure used to test dynamic intensity of protocerebral rocker of a car can at the same time imitate the rigidity restriction of axial direction linearity and radial nonlinearity. One side of anti-yaw fastening device imitate rigidity restriction of axial direction linearity, the other side is separately linked to two triangle crank-spring armor plate agency, anti-yaw fastening device drives one triangle crank agency to do rotary motion clockwise or drives the other one to do rotary motion counterclockwise. The rolling axletree in a climax of the triangle crank component does vertical motion along the top bump of spring panel on the taper, so it produces different acting force and actuating arm acting on spring panel on the taper to result the anti-yaw fastening device to produce nonlinearity rigidity restriction counterforce consisting with rocker radial rigidity property, the back shaft supporting restriction of protocerebral rocker is in the anti-yaw fastening device, so it really re-creates the working state of protocerebral rocker of a car and promote the reliability of simulation test.

The invention discloses a welding spot arrangement optimization method based on welding spot force-bearing homogenization. The welding spot arrangement optimization method comprises the steps of establishing a finite element model of an original welding structure which comprises a plurality of welding spots; applying a restriction and a load on the original welding structure in the finite element model, and obtaining force bearing condition of each welding spot; establishing a welding spot arrangement optimizing mathematical model for minimizing summation of stresses which are bear by all welding spots as an optimizing target in a manner that the contribution value of each welding spot is used as a design variable; determining whether a corresponding welding spot is reserved according to the contribution value of each welding spot, and obtaining optimized welding spot distribution. The welding spot arrangement optimization method is based on structure topology optimization design technology, so that uniform force bearing distribution of each welding spot after optimization is realized. On condition that dynamic strength, static strength and rigidity of a welded structure are ensured, the number of failed welding spot in the bearing process is effectively reduced and furthermore the number of the welding spots is reduced.