156 results about "Displacement function" patented technology

The invention relates to an object deformation real-time simulation graphic processing technique, particularly a soft tissue deformation simulation method based on coupling of mesh-free Galerkin and mass spring, which comprises the following steps: in the pretreatment process, establishing a linear viscoelasticity biomechanical model for soft tissues; in the deformation computation process, dynamically partitioning a mesh-free region and a mass spring region according to the load carried by the soft tissues, establishing a transitional unit of the connection region between the mesh-free region and mass spring region, and constructing a transitional unit approximation displacement function, thereby implementing self-adapting coupling of a mesh-free Galerkin method and a mass spring method;and in the after-treatment process, outputting the state of the mass or node of each time step in the deformation process onto a screen, carrying out illumination rendering, and finally displaying the real-time deformation process of the soft tissue organ under stressed conditions on the screen, thereby implementing visualization effect of dynamic deformation. By utilizing the advantage of high efficiency in the mass spring method and the advantages of high precision and no need of mesh reconstruction in the mesh-free Galerkin method, the invention overcomes the defect that the Galerkin method is not suitable for solving a large-scale problem, thereby effectively lowering the complexity of computation in the soft tissue deformation simulation and enhancing the operation efficiency.

A method for enhancing the linearity of a differential capacitive sensor as a function of beam displacement. An ac-modulated feedback connection from a sensor output terminal to a movable beam electrode is provided through a fix-up capacitor. The output terminal signal is inverted in the feedback connection so that the fix-up capacitor reduces the capacitance from the fixed electrodes to the beam electrode. When the fix-up capacitor value is chosen approximately equal to the fixed capacitance of the differential capacitor, the feedback circuit compensates for the effect of this fixed capacitance. The linearity of the output as a function of the displacement of the beam is improved. Thus, the signal-to-noise ratio of devices such as accelerometers may be increased by allowing sensors to employ a large displacement range. The invention may be used in differential accelerometers and in other types of differential capacitive sensors.

The method comprises: the message packet is sent to a turbo code encoder with 1/3 code rate to generate a system bit-stream, a first even-odd check bit-stream and a second event-odd check bit-stream; wherein, the system bit-stream and the first even-odd check bit-stream uses the block interleavers which use 2M equaling lengths, based on bit-reversed order (BRO), and taken as column displacement function; bias delta of both block interleavers are zero; bias delta of the block interleaver of the second even-odd check bit-stream is not always zero. The invention also provides a cyclic buffer based turbo code HAQQ packet generation method.

The invention discloses a displacement/deflection measuring system, which comprises dip angle sensors, a data acquisition device, a data sending device and a data analysis device, wherein the dip angle sensors are arranged on a structure or a member to be measured to acquire dip angle values of measuring points at which the dip angle sensors are positioned, and the measuring point at which the first dip angle sensor is positioned is used as a datum point; the data acquisition device is used for acquiring the dip angle value, which is measured by each dip angle sensor, of each measuring point, and conditioning the acquired dip angle values; the data sending device is used for sending the conditioned dip angle values to the data analysis device; and the data analysis device is used for calculating a displacement function by matching positional information, relative to the datum point, of each measuring point according to the received dip angle values to acquire a displacement/deflection condition. The invention also discloses a displacement/deflection measuring method. In the displacement/deflection measuring system, the boundary condition of a girder structure within a measuring range is not limited, and the displacement/deflection of the structure or the member to be measured can be measured accurately.

The invention discloses a thin-wall part working modal parameter determining method and system. The method comprises the following steps: establishing an imaging mathematical model based on a monocular vision off-plane vibration measuring device, and an industrial camera pinhole imaging model, determining a target actual displacement function, continuously tracking target angle points by utilizingan optical flow matching tracking algorithm with the pseudo-angle point removal, and obtaining a displacement response signal for each target angle point to vibrate along with each frame of image, calculating the average correlation function of each displacement response signal, and replacing the displacement response signal with the mean correlation function to serve as the Cov-SSI algorithm input item to carry out the working modal parameter identification, so that the working modal test of the thin-walled part is realized. According to the method, auxiliary structure light is not needed, any labels or marks are not needed to be pasted, and multi-view non-contact vibration mode measurement can be achieved, the problem that the calculation efficiency and the measurement precision of themachine vision vibration mode measurement method are low is effectively solved, and the problem that a low signal-to-noise ratio working mode parameter is difficult to identify is well solved.

The invention discloses a ship motion response prediction method considering a damping effect under an underwater explosion effect. The ship motion response prediction method comprises the steps: simplifying a ship into a uniform-section free hull beam; establishing a forced motion control equation of the hull beam considering the structural damping, and determining motion displacement functions of the inner beam in different pressure stages when the structural damping is considered according to the forced motion control equation; according to preset dimensionless damping ratio parameters andpressure distribution functions in the length direction of the hull beam at different pressure stages, determining a main coordinate function of hull beam motion deformation; calculating a motion displacement function of the hull beam in a corresponding pressure stage, and solving deformation parameters of the hull beam in different pressure stages according to the motion displacement function; determining a motion amplitude and a relative rotation angle of the hull beam in different motion deformation processes. According to the method, the ship plastic motion process is analyzed by considering the damping effect, engineering prediction of ship structure motion deformation under the underwater explosion effect can be accurately, easily and conveniently achieved, and prediction errors arereduced.

The invention provides a normal-pressure hypoxic cabin for interval hypoxic training and a method for regulating oxygen concentration in the hypoxic cabin. A normal-pressure hypoxic cabin is provided, and the normal-pressure hypoxic cabin is communicated with a nitrogen source through a flow control component and a flow measurement component and is connected with an exhaust device; an oxygen concentration measuring device connected with a central control unit is provided, the flow measurement component is connected with the input end of the central control unit, and the central control unit is electrically connected with the flow control component; and a gas source cabin with a gas displacement function is provided, masks are arranged in the normal-pressure hypoxic cabin, the masks are respectively communicated with the gas source cabin through a non-return valve and an on-off valve of a gas suction pipe as well as a non-return valve and an on-off valve of an expiration pipe, and the gas source cabin is provided with a gas source input pipe and a gas flow output pipe. The normal-pressure hypoxic cabin provided by the invention has the advantages of simple structure, low manufacturing cost and high safety. The method provided by the invention can be used for regulating the pressure difference between the inside and outside of the hypoxic cabin by controlling the relative amountbetween the input nitrogen amount and exhaust amount, thereby realizing the function of regulating the oxygen concentration in the normal-pressure hypoxic cabin. The method is simple and easy to operate.

The invention provides a design and calculation method for an initial support of a tunnel initial support bearing all design loads. The design and calculation method is characterized in that the initial support of the tunnel initial support bearing the all design loads is designed and calculated by adopting two methods, namely "two hinged arches + 2x2 chain poles + elastic resistance", and "two hinged arches + 10x2 chain poles"; the calculation of the method makes the "structure" completely correspond to the "loads", and makes the corresponding relationship between "measures" and "problems" established on site clearer, and the purpose is more explicit; the method adopts a force method to calculate, thus complete structural internal forces and a displacement function relationship can be obtained, and the change rule of the structural internal forces and displacement can be reflected explicitly; and besides, a familiar general theory is adopted, which can facilitate technical personnel on site to design and calculate the tunnel initial support, and provide a theoretical basis for the development of a construction plan.

The invention relates to a method for setting a longitudinal stiffening rib of a high web of an elastic rotation constrained boundary steel-concrete composite beam. The method comprises the following steps: firstly building a displacement function equation with the elastic rotation constrained boundary and the boundary condition, deriving buckling stress calculation expression of the stiffening rib under two states of the rigid stiffening and flexible stiffening based on an energy method, and obtaining a calculation formula of the elastic rotation constrained boundary longitudinal stiffening rib critical rigidity; and then, considering external work and a minimum potential energy principle, presenting a critical buckling stress calculation formula of a non-uniform pressing plate under the elastic rotation constrained boundary; and finally, according to a buckling safety degree equal principle, obtaining the optical position of setting the longitudinal stiffening rib under the elastic rotation constrained boundary. The method is capable of, according to the actual stress situation, accurately setting the longitudinal stiffening rib of the high web of the steel-concrete composite beam, solving the problems of the current steel-concrete composite bridge bream stiffening rib that the design is conservative and the amount of the steel products is large, and remarkably improving the rationality and economy of the stiffening rib setting of the high web.

The invention belongs to the technical field of radar antennas, and particularly provides an electrostatically formed film reflecting surface antenna analysis method. The method comprises the following steps: firstly, establishing a film reflecting surface finite element model, expressing electrostatic force into an element node displacement function to be exerted into a model, and then conducting model solution by applying an exponential type increment loading manner to obtain film reflecting surface deformation. Compared with the prior art, the film reflecting surface deformation obtained by adopting the method is accurate in result and relatively high in computational efficiency.

The invention relates to a distance adjustment pallet fork with guard boards. The distance adjustment pallet fork comprises a forklift frame mounted on a gantry frame, a left pallet fork body, a right pallet fork body, a left pallet fork oil cylinder and a right pallet fork oil cylinder, wherein the left pallet fork body is mounted on the forklift frame in a horizontal displacement manner, the right pallet fork body is mounted on the forklift frame in a horizontal displacement manner, the left pallet fork oil cylinder controls horizontal displacement of the left pallet fork body, the right pallet fork oil cylinder controls horizontal displacement of the right pallet fork body. The upper portion of the forklift frame is further provided with the left guard board with a horizontal displacement function, the right guard board with a horizontal displacement function, a left guard board oil cylinder for controlling horizontal displacement of the left guard board and a right guard board oil cylinder for controlling horizontal displacement of the right guard board. According to the distance adjustment pallet fork, the left guide board and the right guard board are additionally arranged, so that the problem that large and unstable articles with the high center of gravity are easy shake or even tilt during the carrying process is solved, and accordingly the practicality and the stability of the distance adjustment pallet fork are enhanced.

The invention provides a method for marine natural gas hydrate exploitation through a water flow erosion method combined with heat injection, and belongs to the technical field of marine natural gas hydrate exploitation. Firstly, two development wells are drilled in a natural gas hydrate exploitation area to the interior of a natural gas hydrate reservoir, and a water injection pump is used for injecting marine water into the first development well for heating the reservoir, so that part of a natural gas hydrate is decomposed to generate CH4, a gap channel is opened, and the permeability around the development wells is increased; the pressure difference between the two development wells is controlled by controlling the natural gas collecting speed of a natural gas collection well; stable flow of the marine water in the reservoir is controlled through the pressure difference, and continuous step-by-step composition of the hydrate is promoted under the displacement function in the waterflowing process. The method is easy to implement, high in efficiency and low in cost, and can be used for large-scale industrial exploitation of the natural gas hydrate.

The invention discloses a deformation monitoring method of an elastic supporting plate based on strain monitoring. By adoption of the method, the deformation monitoring theory of beams is extended tothe deformation monitoring of two-dimensional plates, and the monitoring theory of bending deformation of the plate is deduced. The method comprises the following steps: obtaining strain data of theplate by using a strain sensor, approximately assuming a strain function of the plate under an edge elastic supporting boundary condition, substituting strain measurement results of different positions into the strain function to obtain parameters of the strain function, and obtaining a displacement function through a strain-displacement transformation relationship to figure out a bending deformation value of the plate; and calculating the bending deformation of the plate at each moment by calculating the strain at each moment, so that the dynamic monitoring of the bending deformation of the plate can be realized. By adoption of the deformation monitoring method disclosed by the invention, the bending deformation of the plate can be monitored at lower cost by simple equipment on the premise of ensuring the precision, thereby having important theoretical significance and engineering application value for the structure health monitoring, structure safety evaluation, etc.

The invention discloses a zero-pollution underwater oil storage system with an oil and water displacement function. The oil storage system comprises an oil storage cabin, a transition cabin and a seawater inlet/drain cabin which are sequentially arranged on the same horizontal plane; the oil storage cabin is communicated with the transition cabin via a communicating pipeline I, an opening end of the communicating pipeline I is arranged on the lower portion of the oil storage cabin, and another opening end of the communicating pipeline I is arranged on the upper portion of the transition cabin; the transition cabin is communicated with the seawater inlet/drain cabin via a communicating pipeline II, an opening end of the communicating pipeline II is arranged on the lower portion of the transition cabin, and another opening end of the communicating pipeline II is arranged on the upper portion of the seawater inlet/drain cabin; the seawater inlet/drain cabin is communicated with the external via a communicating pipeline III, an opening end of the communicating pipeline III is arranged on the lower portion of the seawater inlet/drain cabin, and another opening end of the communicating pipeline III is arranged on the upper portion of the seawater inlet/drain cabin. The zero-pollution underwater oil storage system has the advantages that underwater oil storage and unloading functions can be realized by an oil and water displacement method, three protection barriers for reducing oily sewage discharge can be formed by means of arrangement of the cabins with different functions, arrangement of the special pipelines, real-time monitoring by the aid of oil sensors and interactive control implemented by the aid of valves, oil and water pumps and the like, and standard discharge of replacement seawater can be implemented.

The invention discloses a bobbin winder with a winding displacement function. The bobbin winder with the winding displacement function comprises a bobbin winder device body and a winding displacement assembly. The bobbin winder device body comprises wire blocking discs, a winding shaft and a handle. A support lug is arranged on the side surface of each wire blocking discs. A matching hole is formed in each support lug. The winding displacement assembly comprises a moving rod, a bent shaft, a connecting block, a fixed block and a driving assembly. One end of the moving rod is located in one matching hole, the other end of the moving rod penetrates out of the other matching hole to be connected with the fixed block, and the fixed block is provided with a strip-type hole; one end of the bent shaft penetrates through the strip-type hole to be connected with the driving assembly, the other end of the bent shaft is rotationally connected with the fixed block, and the fixed block is located on the wire blocking discs; the driving assembly drives the bent shaft to rotate; and a through hole is formed in the moving rod. The moving rod reciprocates along the axis of the moving rod and guides a wire collection direction of electric cables, so that the electric cables are evenly wound on the winding shaft, the condition that electric cable wire winding is uneven is avoided, and the bobbin winder with the winding displacement function is beneficial to carrying a bobbin winder device.

The invention discloses a compound loading test system for a power transmission infrastructure. The compound loading test system for the power transmission infrastructure comprises a rigid frame, and is characterized by also comprising a vertical guide device; the vertical guide device and the rigid frame are fixedly connected with a vertical mobile platform; a horizontal guide device is placed on the vertical mobile platform and is fixedly connected with the vertical mobile platform; a horizontal mobile frame is fixedly connected with the horizontal guide device in a sleeving manner; a vertical loading device is placed at the lower end of the horizontal mobile frame and is fixedly connected with the lower end of the horizontal mobile frame; a horizontal loading device is hinged to the vertical loading device; a test piece clamp is placed below the vertical loading device and is hinged to the vertical loading device. When the compound loading test system for the power transmission infrastructure works: (1) the horizontal loading device applies horizontal force or horizontal displacement to a test component; (2) the vertical loading device provides the same vertical load to act on the test component directly; (3) the vertical loading device applies different vertical displacement to realize moment loading; (4) the pre-applied three-component load is split to obtain a loading displacement function, so as to realize a compound action of a horizontal load (H), a vertical load (V) and a moment load (M).

The invention discloses a displacement deformation prediction method for a shield tunnel with anti-floating anchor rods under foundation pit excavation, and belongs to the technical field of underground engineering. The prediction method specifically comprises the following steps of: predicting; establishing a position relationship between the shield tunnel with the anti-floating anchor rods and aground foundation pit; calculating the additional load of the shield tunnel with the anti-floating anchor rod caused by excavation of the foundation pit; considering a segment ring cooperative deformation model of rotation and slab staggering, calculating the total potential energy Epm of shield tunnel deformation under the action of the anti-floating anchor rod, and solving a longitudinal displacement function w (l), the slab staggering amount delta m2 between adjacent shield segments and the shearing force Qm between adjacent shield segments through Fourier expansion and a variation controlequation. The prediction method has the characteristics that the number of acting segments of the anti-floating anchor rod is considered; the deformation condition of the shield tunnel is close to the real condition; and the accuracy is high.

The invention discloses a Piccolo encryption algorithm hardware achieving method. The Piccolo encryption algorithm hardware can be achieved once by utilizing identical round operation in a repeated calling mode. The original r-1 round repeated calling is directly converted into r wheel repeated calling. Meanwhile, an RP-1 round displacement function is added on the r round circulation operation, and operation is conducted once to enable an output cipher to be correct. By means of the method, an original algorithm is not required to achieve again in the last rth round, the former repeated round function module can be directly multiplexed, and users only need to add the relatively simple RP-1 in the end. By means of the method, modules in the Piccolo encryption algorithm to be highly multiplexed, hardware achieving area is effectively saved, and meanwhile the encryption speed is increased.