83results about How to "Guaranteed Stability Requirements" patented technology

The invention relates to the technical field of civil engineering construction, in particular to a construction method of an ultra-deep underground diaphragm wall in a water-rich soft-soil area. The construction method comprises the following steps: making an analysis and research on the stability of trench walls of the underground diaphragm wall and doing relevant preparations, preparing wall protecting slurry, building a guide wall, performing trenching construction, wall cleaning and sediment removal, manufacturing and hoisting reinforcing cages, backfilling joints between trench sections, and pouring wall concrete. According to the construction method, through a stability analysis method that introduces strength reduction, the security coefficients of stability of the trench walls are calculated based on a finite difference method; through parameter-reduction circular calculations, not only the limit stress and large deformation state of the trench walls but also the stability coefficients of the trench walls are obtained, which has practice guiding significance in construction; and the results are simple and practical and conform to the habits in the engineering field, and the stability requirements of the trench walls are effectively guaranteed, so that the engineering construction can be completed safely and fast with high quality.

The invention discloses an extreme-low-altitude laser radar digital terrain mapping system and an extreme-low-altitude laser radar digital terrain mapping method of a small-sized unmanned helicopter. The system is formed by an airborne system and a ground station system, wherein the airborne system is used for accurately collecting data of each sensor, carrying out synchronization processing on the data of the sensors and navigation control of the unmanned helicopter, and can realize data interaction with data of the ground station system through wireless receiving and dispatching equipment; the ground station system is used for receiving and processing data from an airborne laser radar hardware system or checking and processing a data file in an offline manner; the airborne system is formed by a coprocessor and a main processor; and the coprocessor is used for collecting gesture data and position data of the system or realizing the navigation control of the airborne system. According to the extreme-low-altitude laser radar digital terrain mapping system, a mode of matching the coprocessor with the main processor is utilized so that the requirements of the instantaneity and the stability of the navigation control of the small-sized unmanned helicopter are guaranteed, the system is flexible and the function of the airborne system is conveniently expanded; and the system has the advantages of low power consumption, low cost, high integration, high efficiency and the like.

The invention provides a secondary mirror supporting structure of a space optical remote sensing camera, belongs to the technical field of space optical remote sensing, and aims at solving the technical problems that the conventional supporting structure has high weight, low specific stiffness, high truss rod width and high obscuration ratio. One surface of the flange is evenly provided with multiple flange bosses. The edge of the same surface is evenly provided with multiple flange embedding connectors. The cross section of the truss rods is shaped like a Chinese character "ri". One end of each truss rod is connected with the top part of a truss cylinder base through a truss rod embedding connector, and the other end is connected with the flange through one flange embedding connector. Multiple pre-embedded members are fixed on the bottom part of the truss cylinder base. The structural stiffness can be strengthened and the advantages of stable structure and low gravity deformation canbe realized by the ring enforcing ribs arranged in the truss cylinder base, and the stray light shading capacity can also be provided. The cross section of the truss rods is shaped like the Chinese character "ri" so that the advantages of low obscuration, high stiffness and high lightweight rate can be realized.

The invention relates to a rotating triple-prism beam scanning device comprising a rotating double-prism system, a rotating single-prism system, a guide rail, an adjustable support, and a fixed support. The rotating single-prism system comprises a base component, a prism and frame assembly, and a worm-and-gear mechanism. The prism and frame assembly comprises a flat washer, a wedge prism, a rubber pad, a wedge retainer ring, a threaded retainer ring, and a frame. The base component comprises a base, a base baffle, and a base insert. The worm-and-gear mechanism comprises a rotary motor, a motor stand, a coupling, a worm, a bearing support, a rolling bearing, a worm gear, an encoder support, and a rotary encoder. The rotating double-prism system is formed by assembling two rotating single-prism systems together. In the invention, the three wedge prisms are driven by the worm-and-gear mechanisms to do full-circumferential rotation, transmission is stable and accurate, and the scanning precision and stability of dynamic beams can be ensured; the prisms are independent of one another in rotation control, and diversified scanning modes can be achieved; and by introducing the third prism to the double-prism system, the scanning field of beams is enlarged significantly, and the problem that a double-prism system has scanning blind areas and control singular points is solved effectively.

The invention discloses a multi-path routing judgment method for an industrial wireless mesh network. Three judging criteria are mainly taken into consideration: 1, constraint conditions required to be met during end-to-end transmission, based on control data which has requirements on timeliness and reliability of wireless Mesh network transmission; 2, a judging mechanism for judging the proper number of concurrent transmission paths between a source node and a target node under a given condition of wireless Mesh network topological structure; and 3, an evaluating criterion for evaluating the path attributes of an equivalent path on a logic formed by multiple concurrent paths between the source node and the target node. By the multi-path routing judgment method for the industrial wireless mesh network, a specific routing judgment method is provided for implementing a multipath concurrent routing mechanism in the wireless Mesh network, so that the timeliness and the reliability of the wireless Mesh network transmission can be improved easily.

The invention provides a reflecting surface of a deployable antenna based on a shape memory polymer and a manufacturing method of a reflecting surface piece thereof, which relate to a reflecting surface of a deployable antenna and a manufacturing method of a reflecting surface piece. The invention solves the problems of large weight, large volume, complicated structure and unsteady deployment andcontraction of a traditional deployable antenna used for spaceflight. The deployable antenna is formed by splicing an annular power component, an annular reinforcement component, a radial reinforcement component and a reflecting film. The manufacturing method of the reflecting surface piece comprises the following steps of: (1) designing a mold; (2) preparing a shape memory polymer material; (3) coating a fibre reinforced material by using the shape memory polymer material; (4) forming an uncured fibre-reinforced shape memory polymer blank; (5) putting the closed mold into a heating box and heating; and (6) demolding to obtain a skeleton structure taking the fibre-reinforced shape memory polymer as the material. The invention can be used as the reflecting surface of the deployable antennain the field of the spaceflight.

The invention provides a device and a method for generating an all-optical arbitrary waveform based on an optical fiber Bragg grating. The device consists of a coherent light source and a control part; and the control part consists of circulator and an optical fiber Bragg grating array which is formed by connecting a group of optical fiber Bragg gratings, a polarization controller and an optical fiber stretcher in series. The method comprises the following steps of: inputting the coherent light source from the input end of the control part; regulating a reflection wavelength of the optical fiber Bragg grating array in the control part so as to select the wavelength of the coherent light source, regulating the reflectivity of the optical fiber Bragg grating array to control the amplitude of the coherent light source, and regulating the optical fiber stretcher to control the phase of the coherent light source; acquiring the designed all-optical arbitrary waveform in a time domain according to the Fourier transform principle and outputting by the output end of the control part. By regulating the wavelength, the amplitude and the phase of the coherent light source in a frequency domain, the output of the all-optical arbitrary waveform can be acquired in the time domain; and the device for generating a pulse waveform has a simple structure, and the method for generating the pulse waveform is easy to realize.

The invention relates to the technical field of high-pier long-span concrete bridges, in particular to a method for controlling the lateral stiffness of high-pier long-span concrete continuous girder bridges and bridges. The control method includes: a. determining the span of the continuous girder bridge and the height of the pier; b. setting Obtain the corresponding vehicle-bridge coupling dynamic response value under different bridge pier transverse line stiffness; c, compare and draw the curve of the bridge pier transverse line stiffness and the corresponding vehicle-bridge coupling dynamic response value; d, obtain the transverse stiffness limit of the continuous girder bridge; e. Determine the design parameters of continuous girder bridges that meet the requirements of the lateral stiffness limit. In this control method, by changing the transverse line stiffness of the bridge pier, the curve diagram of the corresponding vehicle-bridge coupling dynamic response value is obtained, and the lateral stiffness under the vehicle-bridge coupling dynamic response value that meets the requirements is selected to obtain the stiffness limit, and then the bridge design parameters, The stiffness of the continuous girder bridge is controlled to ensure the structural safety of the bridge during use and the safety, stability and comfort requirements of the train when it is running.

The invention discloses a special sawing machine for large members, which comprises a sawing machine main body, a sawing frame device and a trapezoid guide rail, wherein the bottom of the sawing machine main body is connected with the trapezoid guide rail; the sawing frame device is mounted on the sawing machine main body; the sawing machine main body comprises guide sleeves, a second motor, a speed reducer, a first lead screw, a lifting hydraulic cylinder, a base, uprights and a fixed connection rod; the second motor is connected with the speed reducer; the speed reducer is connected with the first lead screw; and the first lead screw is connected with the base. The special sawing machine is convenient, simple and flexible to operate, easy to realize and observe, small in floor area, compact in structure, convenient to adjust, safe and reliable, and improves the production efficiency greatly; due to the design improvement of the traditional structure, the uprights are used pairwise, a left sawing frame and a right sawing frame are separated, and can move left and right oppositely, and a processing range is enlarged; the movable sawing machine main body is adopted, so that the cutting requirement of a large member which is inconvenient to move can be met; and the problem that a workpiece is difficult to move is solved.

The invention discloses an integral active electric power-assisted steering mechanical structure. The structure comprises an electric power-assisted steering system, a steering system gear ratio system and a back wheel steering system, wherein the electric power-assisted steering system and the steering system gear ratio system are realized by a steering system variable-gear ratio electric power-assisted steering system; the back wheel steering system is a special device system for supplying steering force to a back wheel; the steering system variable-gear ratio electric power-assisted steering system is realized by an electronically-controlled harmonic gear transmission between a steering wheel and a lower transmission shaft; and the back wheel steering system consists of a support shaft ring, an outer shell, a motor stator coil, a permanent magnet rotor, a motor angle sensor, a central hollow shaft, a recirculating ball retarding mechanism, a lock sleeve and a rack shaft. In a steering process, an adjusting motor and a power assisting motor are controlled flexibly and compensate for each other, so that steering sensitivity, portability and operation stability are combined perfectly and operation performance and safety performance are enhanced.

An intelligent bamboo-shaped releasing mechanism made of a shape memory polymer composite material aims to solve the problem that when a traditional space expansion mechanism releasing mechanism is unfolded, impact is generated, and accordingly atmosphere environments are polluted. The diameter of an inner lower straight tubular section is smaller than that of an inner upper straight tubular section, an outer sleeve intensifier is sequentially composed of an outer upper straight tubular section, an outer taper tubular section and an outer lower straight tubular section from top to bottom, the diameter of the outer lower straight tubular section is smaller than that of the outer upper straight tubular section, the outer sleeve intensifier is arranged on an inner sleeve driver in a sleeving mode, an inner upper straight tubular section is located in the outer upper straight tubular section, an inner taper tubular section is located in the outer taper tubular section, an inner lower straight tubular section is located in the outer lower straight tubular section, the upper end face of the inner upper straight tubular section is lower than that of the outer upper straight tubular section, the lower end of the inner lower straight tubular section is exposed out of the outer lower straight tubular section, the inner wall of the inner sleeve driver and the inner wall of the outer sleeve intensifier are each coated with a thermoelectric film, and the inner sleeve driver and the outer sleeve intensifier are both made of the shape memory polymer composite material. The mechanism is used for space expansion mechanisms in the field of aerospace.

The invention relates to a tide level data transmission system based on Beidou satellite communication. The tide level data transmission system based on Beidou satellite communication comprises a conventional tide reporting station and a conventional tide reporting data receiver, and further comprises a tide level data collecting and sending device used for receiving messages of the conventional tide reporting station, a Beidou satellite used for transferring the messages of the tide level data collecting and sending device, and a tide level data receiving and transferring device used for receiving the messages transferred by the Beidou satellite, wherein the tide level data receiving and transferring device sends the tide level messages to the conventional tide reporting data receiver in a wireless mode. On the premise of not damaging a transmission process blueprint of an existing ship automatic tide level reporting system, the characteristics of reliability, weather resistance and long distance of navigation data transmission of the Beidou satellite are utilized and combined with an original tide level transmission mode, only functional devices with the continuing and filling properties are used, and then tide level data can be effectively transmitted to the areas where a traditional wireless data transmission board cannot cover.

The invention belongs to the technical field of numerical control cutting machines and particularly discloses a control system for a numerical control cutting machine. The control system comprises an ARM processor module, a storage module, a power module, a human-computer interaction module, a communication interface module, a digital to analog (D/A) conversion module, a complex programmable logic device/field programmable gate array (CPLD/FPGA) module and an input output module. An embedded system based on an ARM processor and a muC/OS-II is adopted, and real-time performance, stability and reliability of the numerical control cutting machine are improved.

The invention relates to an electric power-assisted steering system with VTMS (Variable Transmission Motor System) variable speed transmission ratio and provides an electronic controlled electric power-assisted steering stability safety device which is realized by arranging a VTMS between a steering wheel and a transmission shaft and connecting an electric power-assisted steering system with variable transmission ratio, wherein the VTMS consists of eight basic parts of a middle transmission shaft, a motor angle sensor, a motor stator coil, a rotor permanent magnet, a stator framework, an output shaft, a protection shaft sleeve and a relay. In the invention, by monitoring various signal values of the VTMS, the torque quantity of a steering column of a vehicle can be worked out, thereby omitting torque sensors, torque bars and other crucial parts used in traditional technology and achieving the advantages of cost saving and simple assembling and manufacturing; in addition, during the process of steering, the VTMS and a power-assisted motor are under flexible control and mutually compensate, and therefore, the sensitivity, the portability and the stability of steering can be combined perfectly, and the operation performance and the safety can also be improved.

The invention relates to an anterior cervical fixing system capable of preventing overcompensation motion, which belongs to the technical field of surgical instrument. The anterior cervical fixing system adopts the technical proposal that the anterior cervical fixing system comprises a fused vertebra fixing plate used for fixing two or a plurality of vertebra bodies, an adjacent vertebra fixing plate used for fixing adjacent vertebra bodies, and a limit ligament which connects the fused vertebra fixing plate and the adjacent vertebra fixing plate, so as to limit the spacing distance between the fused vertebra fixing plate and the adjacent vertebra fixing plate. The anterior cervical fixing system can support the vertebral body of a surgical section, can realize fusion of decompression sections and simultaneously change the stress concentration phenomenon of adjacent sections of the decompression sections and prevent or relieve degeneration of intervertebral discs of the adjacent sections, has a simple structure, and is convenient to operate when being used for surgeries.

The invention provides a network device in a PTP domain, and a TOD synchronization method, and relates to the technical field of network communication. The device comprises a main controller, a programmable logic device and PHY chips, where the main controller is used for separately setting a clock deviation in registers of the obtaining a PHY chips when the clock deviation between master and slave devices is obtained, and setting a pulse width and delay time of the programmable logic device to trigger the programmable logic device to generate a time synchronization pulse signal; the programmable logic device is used for generating the time synchronization pulse signal under the trigger of the main controller and separately sending the time synchronization pulse signal to the PHY chips; and the PHY chip is used for receiving the clock deviation for TOD synchronization after receiving the time synchronization pulse signal. by adoption of the network device in PTP domain, and TOD synchronization method provided by the invention, the time synchronization efficiency of the PHY chips is improved, thereby ensuring the time synchronization performance of the device in the PTP domain.

The invention discloses a disaster recovery method and device for map matching, equipment and a storage medium, and relates to the field of map matching. According to the specific implementation scheme, the method comprises the following steps: thinning a first track issued by a GPS point distribution system based on a preset key node to obtain a second track; and determining a path of the second track based on the second track and a pre-established path set so as to perform map matching according to the determined path of the second track, wherein the path set comprises a plurality of paths, and each path comprises the plurality of key nodes. The disaster recovery effect of map matching can be improved.

The invention relates to a nickel-chromium intermediate alloy and a preparation method thereof, and belongs to the technical field of alloy smelting. The nickel-chromium intermediate alloy comprises the following components of, in percentage by weight, 68-72% of Cr, Si smaller than or equal to 0.2%, Al smaller than or equal to 0.1%, Fe smaller than or equal to 0.2%, C smaller than or equal to 0.05%, Cu smaller than or equal to 0.002%, S smaller than or equal to 0.0015%, P smaller than or equal to 0.0025%, O smaller than or equal to 0.005%, N smaller than or equal to 0.005%, Sb smaller than or equal to 10 ppm, Sn smaller than or equal to 5 ppm, Bi smaller than or equal to 5 ppm, Pb smaller than or equal to 5 ppm, As smaller than or equal to 10 ppm and the balance Ni. The method has the beneficial effects that the obtained nickel-chromium intermediate alloy is good in consistency, and the stability requirement of nickel-chromium-based alloy smelting raw materials is fully met.

The invention discloses a U-shaped steel-structure formwork which is used for pouring concrete beams. The U-shaped steel-structure formwork comprises a bottom steel plate, two side steel plates, a plurality of lower H-shaped steel beams and a plurality of upper H-shaped steel beams. A U shape is formed by splicing the bottom steel plate and the two side steel plates. The lower H-shaped steel beams are arranged on the bottom steel plate at intervals in the length direction of the bottom steel plate, webs of the lower H-shaped steel beams are perpendicular to the bottom steel plate, the upper H-shaped steel beams are correspondingly arranged on the lower H-shaped steel beams, upper wing plates of the upper H-shaped steel beams are connected with the two side steel plates through two top steel plates respectively, and webs of the upper H-shaped steel beams are perpendicular to the bottom steel plate. A reinforcement cage can be rolled in advance on the ground, the concrete beams can be directly formed in the formwork through pouring after the steel-structure formwork is hung, and therefore the construction quality can be effectively ensured, no scaffold needs to be erected any more, the construction period can be shortened, and good economic benefits are achieved.

The invention provides a thread number evaluation method and device, and the method comprises the steps: obtaining parameter information of a to-be-evaluated server in a retrieval system, and the parameter information comprising the average flow and the average processing time; establishing a relational expression between the parameter information and the performance parameter information; whereinthe performance parameter information comprises the total number of requests on the server, the number of requests to be processed, the average waiting time and the average response time; wherein theperformance parameter information and the thread number of the server have an association relationship and change along with the change of the thread number of the server; obtaining the thread numberwhen the average response time meets the expected response time by combining the relational expression, the parameter information and the queuing model; determining the thread number as the thread number of the server, so that the thread number can be determined by combining the parameter information of the server, the relational expression between the parameter information and the performance parameter information and the queuing model, the thread number does not need to be adjusted for multiple times, the time period is short, and the stability requirement of the retrieval system can be ensured.