218results about How to "Symmetrical" patented technology

The invention discloses a full-duplex transceiver in a flat fading environment and a method for canceling self-interference. The method includes dividing received signals by a coupler to obtain a channel I of signals and a channel Q of signals at a receiving end; respectively transmitting the channel I of signals and the channel Q of signals into a channel I receiving channel and a channel Q receiving channels which are structurally symmetrical with each other; canceling the self-interference in a simulated manner in the receiving channels by the aid of multipliers, adders and a radiofrequency interference reconstruction module; digitally canceling the self-interference at the rear end via a digital cancellation unit; transmitting delay estimation parameters and channel estimation parameters to a delay module, the radiofrequency interference reconstruction module and the digital cancellation unit; circularly canceling the self-interference until the optimal cancellation effect is realized. Phase difference between the channel I of signals and the channel Q of signals is 90 degrees. The delay estimation parameters and the channel estimation parameters are generated by a channel / delay estimation unit. The full-duplex transceiver and the method have the advantages that the complexity of the structure of the transceiver can be effectively decreased by the aid of self-mixing and zero-intermediate-frequency technologies, the cost can be saved, and the size of the full-duplex transceiver can be reduced; requirements of self-interference signals on the precision of delay devices can be greatly reduced, and the devices can be selected conveniently and can be implemented easily; the receiving channels are independent from each other, are structurally symmetrical with each other and can be integrated easily.

The invention discloses a multi-axial inertial sensor and a method for measuring multi-axial translatory motion and rotating acceleration. The sensor includes a frame moving along a spindle, one or more pair of inductive mass blocks and an outer elastic structure. Each inductive mass block is hanged on the frame by an inner elastic structure, the symmetric axis of the inner elastic structure is consistent with the symmetric axis of the hanged inductive mass block, the frame is hanged on a sensor platform by the outer elastic structure; the inner elastic structure and the inductive mass block are installed to lead the centers of mass to deviate with each other along the direction of the spindle, and the outer elastic structure and the frame are also installed to lead the centers of mass to deviate with each other along the direction of the spindle. The multi-axial inertial sensor of the invention can measure a plurality of axial acceleration and rotation at the same time, which has high resolution, rather low inter-axle crosstalk sensitivity and strong resistance to environmental noise, and produces with low cost and mass.

A magnetic roller adsorptive climbing-on-wall robot for detecting the welded seam of oil shaft's wall is composed of the supporting frame, left and right roller structures symmetrically fixed to left and right of said supporting frame, detector unit in the front of said supporting frame, rollers, code disk, and position correcting mechanism.

The invention discloses a bionic wing-flapping and bouncing multi-mode movement robot which comprises a rack, a bouncing mechanism, a wing-flapping mechanism and a driving mechanism, wherein the bouncing mechanism, the wing-flapping mechanism and the driving mechanism are arranged on the rack. The bouncing mechanism comprises feet, a folding mechanism, a torsional spring frame and a winch wheel. The wing-flapping mechanism comprises two wing mechanisms and two tail wing mechanisms, wherein the two wing mechanisms and the two tail wing mechanisms are respectively symmetrical in a left-right mode. The driving mechanism comprises a driving motor, a gear transmission mechanism and a ratchet mechanism. The gear transmission mechanism comprises an input gear and an output gear meshed with the input gear. The output gear comprises a tooth-incomplete gear, a crank gear connected with a crank, and a winch wheel gear connected with the winch wheel. The crank gear is meshed with the half side, with complete teeth, of the tooth-incomplete gear, and the winch wheel gear is meshed with the half side, with incomplete teeth, of the tooth-incomplete gear. The driving mechanism with the single motor drives the wing mechanisms and the bouncing mechanism to work, the complexity and the whole mass of the robot are effectively reduced, and the feasibility of the multi-mode movement robot is improved.

An optical system of a helmet displayer comprises a micro displayer, a bonding lens and an optical combiner. The micro displayer and the bonding lens are bonded integrally, the optical combiner comprises two tightly-adhered right-angle prisms forming a 45-degree angle and a concave-surface reflecting mirror, a narrow-band high-reflective optical surface is located at the bonding position of the two right-angle prisms and forms a 45-degree angle respectively with the horizontal optical axis and the vertical optical axis, the concave-surface reflecting mirror and the right-angle prisms are bonded integrally, and the concave surface is the high-reflective optical surface. Light beams are emitted from the micro displayer, are converged through the bonding lens, enter the optical combiner and pass through the narrow-band high-reflective optical surface, then transmitted light beams are converged through the high-reflective optical surface again, and reflected light beams become parallel light beams after the light beams pass through the narrow-band high-reflective optical surface again. An exit pupil is located at the position of a pupil of one human eye, extraneous light enters the optical combiner and passes through the narrow-band high-reflective optical surface, and then the transmitted light beams enter the pupil of one human eye. The optical system of the helmet displayer has the advantages of being compact in system, convenient to correct, good in aberration correction and high in reliability.

The invention discloses an integrated five-axis motion sensor based on MEMS technology, which includes a frame moving along a spindle, two pairs of same inductive mass blocks, an outer elastic structure and two pairs of electrodes. Each inductive mass block is hanged on the frame by an inner elastic structure, the frame is hanged on a sensor platform by the outer elastic structure, the two pairs of inductive mass blocks are connected to form a capacitance sensor; four mass blocks are located in the same plane when the frame does not move, the first pair of the capacitance sensors are used for sensing the first motion of the frame relative to the sensor platform; and the second pair of the capacitance sensors are used for sensing the second motion of the frame relative to the sensor platform. The five-axis motion sensor of the invention can measure a plurality of axial acceleration and rotation at the same time, which has high resolution, rather low inter-axle crosstalk sensitivity and strong resistance to environmental noise, and uses MEMS technology for low cost and mass production.

The invention discloses a two-stage micro-displacement amplification mechanism which is characterized in that two triangle displacement zooms are arranged and respectively are a first stage triangle displacement zoom and a second stage triangle displacement zoom, each triangle displacement zoom comprises four sloping sides; the input end of the first stage triangle displacement zoom is linked with a driven element; the output end of the first stage triangle displacement zoom is linked with the input end of the second stage triangle displacement zoom. In the optimized scheme, flexibility hinges are respectively arranged at the joint of the displacement input end and the four sloping sides of the triangle displacement zoom and the joint of the displacement output end and the four sloping sides; the displacement input end of each triangle displacement zoom is provided with a positioning step. Two-stage micro-displacement amplification mechanism provided with by the invention has the advantages of zero friction, zero clearance and zero delay, and is easy to maintenance and service; the mechanism avoids oversized elastic counterforce caused by structural distortion, ensures direction stabilization of the displacement output; the displacement enlargement ratio of the two-stage displacement amplification is greatly improved, and the mechanism has very high practicability.

The present invention provides a network topology structure on a star-cluster double-loop (SCDL), and the structure consists of 4m*2k processing units and 4m switching nodes, wherein, each 2k processing units are connected to form a star network topology structure, therefore, 4m star structures are formed; switching nodes of the 4m star structures are connected to form DL (2m) interconnection network topology structures. The present invention has the characteristics of canonicity, symmetry, planarity, excellent extendibility, lower network cost, simple switching nodes and simple routing policy. According to the present invention, a switching node is connected with four processing units, therefore, communication distance between processing units is reduced, localization feature of the system is improved, delay of the system is reduced and throughput of the system is improved. A novel Johnson coding method can be adopted by the switching nodes and processing units of the present invention, and the method make the coding of the switching nodes and processing units imply information of adjacent nodes and links of the interconnection network; therefore, the route algorithm design is simple.

The invention discloses a method and system for recommending friends based on the social network. The method comprises the step of extracting interactive information between a user and other users in the social network, establishing an interactive success friend group for each user and classifying other users who have success interactive relation with the user to the interactive success friend group of the user, the step of calculating interaction connecting strength between the user and each friend in the interactive success friend group according to the number of success interaction of different interaction types between different users and selecting a plurality of friends in the top of maximum interaction connecting strength, the step of respectively calculating the interaction connecting strength between the friends and other users who have success interactive relation with the friends, and the step of recommending the users who have the maximum interaction connecting strength with the friends to the user. The invention belongs to the technical field of network communication, and personalized friend recommendation can be carried out according to the interactive behavior of the users in the social network.

The invention relates to a tetrahedral rolling robot with a parallel mechanism, which comprises six telescopic booms and four gusset plate assemblies. Each gusset plate assembly comprises a gusset plate and three cardan joints, wherein the three cardan joints are distributed in a regular triangle at a bottom plate surface of the gusset plate. The six telescopic booms have the same structure and adopt a cable-driven mode. Both ends of each telescopic boom are respectively connected to the cardan joint formed by two gusset plate assemblies. The four gusset plate assemblies have the same structure and the three cardan joints in each gusset plate assembly are respectively connected with one end of the three telescopic booms. The robot can change motion type to conform to different environmentsby the cooperation of cables, thread wheels, pulleys and a motor in a driving mode and has larger motion flexibility. Rich motion types enable the robot to face various types of barriers leisurely without considering the problem of stability.

The invention relates to a semi-submersible wind power generation foundation platform which comprises a foundation structure platform, a fan tower, a wind generating set, an umbilical cable and a positioning system. A center part at the top of the foundation structure platform is a center buoyancy tank, the upper portion of the center buoyancy tank is connected with the fan tower, and the wind generating set is arranged at the top of the fan tower. A stand column perpendicular to the water surface is arranged outside the central buoyancy tank at the top of the foundation structure platform, and a horizontal buoyancy tank is arranged between the stand column and the central buoyancy tank; the lower portions of the adjacent stand columns are connected through connecting buoyancy tanks, and heaving plates are arranged at the bottom ends of the stand columns. The bottom of the foundation structure platform is of a regular triangle structure. The bottom of the central buoyancy tank is connected with the umbilical cable connected with a seabed power line. The foundation platform has the beneficial effects that the foundation platform is simple and reasonable in structure, the wind generating set has symmetry relative to arrangement of the foundation structure platform, interchangeability of structural components and an anchoring system is high, standardization of the foundation platform structure is facilitated, and the construction cost is reduced.

The present invention is parallel triaxial spindle head structure and belongs to the field of machine building technology. The parallel triaxial spindle head structure includes one spindle, one movable platform, one fixed platform, and three identical branches to connect the movable platform and the fixed platform, with the spindle being fixed onto the movable platform. Each of the three branches includes one input rod member, one multivariant hinge connected to the movable platform, and two kinematic pairs, including one driving one connected between the input rod member and the fixed platform and one driven one connected between the input rod member and the multivariant hinge. The present invention may operate alone or through coordination with other device, and has high rigidity, low moving mass, high dynamic performance, simple structure, low cost and other advantages.

The embodiment of the invention discloses a method and device for regulating pixel voltage symmetry, relating to the liquid crystal display technology and aiming to improve the display quality of a TFT (Thin Film Transistor) LCD (Liquid Crystal Display). The method comprises the steps of: simultaneously regulating pixel positive voltages and pixel negative voltages according to a set pixel common voltage; obtaining each brightness value at different pixel positive voltages or pixel negative voltages; confirming the pixel positive voltage and the pixel negative voltage which are corresponding to the brightness value serving as an extreme value according to the corresponding relation between the pixel positive voltages or pixel negative voltages and the each brightness value; using the pixel positive voltage and the pixel negative voltage which are corresponding to the brightness value serving as the extreme value as the pixel positive voltage and the pixel negative voltage which satisfy the pixel voltage symmetry. The method and device which are provided by the embodiment of the invention are mainly applied to the TFT LCD technology.

The invention provides a two-degrees-of-freedom translation parallel robot mechanism, comprising a substrate, a movable platform and a branched chain which is connected with the substrate and the platform respectively. The branched chain comprises a first active branched chain, a second active branched chain and a third passive branched chain, wherein a movable plane of the second active branchedchain and a movable plane of the first active branched chain are of the same plane or two parallel planes; and a movable plane of the third passive branched chain is crossed with a movable plane of the first active branched chain. The robot mechanism has the advantages that the third passive branched chain is adopted to connect the substrate and the movable platform to improve the attitude duration of the movable platform, and enables the robot mechanism to realize higher operation accuracy; the third passive branched chain is adopted, so that the first active branched chain and the second active branched chain have the same structure, simple design and symmetric kinematics and dynamic properties; and the first active branched chain and the second active branched chain respectively use a first master arm and a second master arm as dynamic input, thus the operation velocity of the robot mechanism is further improved.

The invention discloses a vibration isolation structure based on bistable curved beams. A plurality of cell element structures are sequentially connected and regularly arranged in a plane or space to form the vibration isolation structure. Each cell element structure comprises a supporting rod, the bottom end of each supporting rod is connected with the top of the corresponding bistable curved beam, the two ends of each bistable curved beam are connected with the two ends of a connecting rod correspondingly, and a spring is connected between the top of each bistable curved beam and the corresponding connecting rod. The vibration isolation structure is simple in structure and easy to manufacture, the positive stiffness and the negative stiffness in a whole vibration isolation system are easy to adjust, then the force corresponding to a quasi-zero stiffness interval is adjusted so as to adapt to different loads, meanwhile, the minimum unit modular design can adapt to different structural environments, and the engineering requirements are met.

The composite material box body structure for storage and transportion box of missile is characterized by that said box body structure possesses the shallow arched single shell plate structure with longitudinal reinforcement member and transverse reinforcing rib and correspondent symmetrical layer-spread form, its four-side base plate of said box body structure is made up by using four-side small arch degree and shallow arched shell plate and four-corner cylindrical shell plate which are smoothly connected togher, along the length direction of base plate of box body the transverse reinforcing ribs are uniformly-spaced and placed, two ends of said box body adpots the all-composite material flange flanges which are connected with box body base plates together and formed into one body, so that said box body structure possesses high specific strength.

The invention provides a fractional sampling rate conversion method for a complex coefficient Hilbert band-pass filter. A real coefficient band-pass filter with the sampling rate of L*fsi is designed by engineering simulation design software Matrix Laboratory (MATLAB), then an impulse response sequence of real numbers hr(n) is converted into an impulse response sequence of complex numbers hc(n) by a Hilbert transformation function provided by the MATLAB, and the hc(n) is taken as the complex coefficient of the Hilbert band-pass filter; an L phase subfilter complex coefficient is acquired, and the L phase subfilter is realized through an implementation structure of a common finite impulse response (FIR) filter in a field programmable gate array (FPGA), so that an L times of parallel interpolation filter structure with increased sampling rate is formed; M times of extraction rate conversion is realized through write operation of a first in first out (FIFO) data buffer, and through independent write operation on the FIFO in a clock domain with sampling rate of fsi and independent read operation on the FIFO in the clock domain with the output sampling rate of fso=(L / M)*fsi, direct data transmission between the clock domain with the sampling rate of fsi and the clock domain with the sampling rate of fso is isolated, so that fractional rate L / M is changed.

The invention discloses a panel antenna folding and unfolding unit and a two-dimensional folding and unfolding antenna mechanism. The panel antenna folding and unfolding unit comprises a plurality of panel antenna folding and unfolding units, large-span inter-plate hinges, positioning locking hinges and supporting trusses, wherein after the plurality of panel antenna folding and unfolding units are respectively and completely unfolded, all the antenna panels are in the same plane and are transversely and sequentially connected, the first antenna panels corresponding to two adjacent panel antenna folding and unfolding units are connected through two large-span plate hinges, the second antenna panels corresponding to every two connected panel antenna folding and unfolding units are connected through the positioning locking hinges, the third antenna panels corresponding to every two connected panel antenna folding and unfolding units are connected through the positioning locking hinges, the synchronizing mechanism of each panel antenna folding and unfolding unit is connected with the corresponding supporting truss, and every two adjacent supporting trusses are transversely and rotationally connected. The structure is reasonable, the unit unfolding stability is good, the folding rate is large, and the applicability is good.

The invention discloses a two-way wireless-energy stable transmission system circuit topology applicable to the wide-coupling coefficient variation range and a control strategy and belongs to the technical field of wireless energy transmission. An energy transmission system comprises two multi-resonant structures, a variable-frequency power supply, a state detection and frequency controller, a variable-frequency control strategy module, a coupling mechanism and an alarm device. The variable-frequency control strategy on the basis of a multi-resonant compensation network is applicable to a wireless charging system and can enable the wireless energy transmission system to be suitable for greater displacement deviation.

The invention discloses an FPGA intra-IO sheet interconnecting digital circuit based on re-encryption algorithm. The FPGA intra-IO sheet interconnecting digital circuit comprises a sending end digital circuit, a receiving end digital circuit and a clock generation module, wherein the sending end digital circuit comprises a plaintext data generation logic, a first asynchronous FIFO, a head synchronous LFSR encryption module, a second asynchronous FIFO, an AES encryption module, a parallel-serial conversion module, a serializer and an OBUFDS module, and the receiving end digital circuit comprises a deseriallizer, an IBUFGDS module, a serial-parallel conversion module, a third asynchronous FIFO write control logic, a third asynchronous FIFO, an AES decryption module, a fourth asynchronous FIFO, a head synchronous LFSR decryption module and a plaintext data reception logic. Encryption and decryption of interconnected data transmission processes between FPGA virtual IO sheets are realized through stable and effective re-encryption algorithm.

The invention relates to a microgripper with two stages of magnification mechanisms. The microgripper comprises a motion input mechanism, two displacement input platforms, two fixed racks, four sets of first-stage lever mechanisms, two sets of second-stage bridge type magnification mechanisms and a pair of clamping arms. The displacement platforms are in bilateral symmetry, and the first-stage lever mechanisms are bilaterally symmetric and vertically symmetric. The second-stage bridge type magnification mechanisms are vertically symmetric, and the clamping arms are vertically symmetric. The two ends of the motion input mechanism are connected with the displacement input platforms correspondingly, and the output ends of the displacement input platforms are in transmission connection with the input ends of the second-stage bridge type magnification mechanisms correspondingly through the first-stage lever mechanisms. The output ends of the second-stage bridge type magnification mechanismsare connected with the clamping arms. According to the microgripper, the bridge type magnification mechanisms have symmetry, parallel clamping of a microgripper head is guaranteed, output displacement is directly transferred to the clamping arms, and the microgripper head cannot generate parasitic displacement. The two stages of magnification mechanisms are adopted, displacement subjected to first-stage magnification is input into the bridge type magnification mechanisms, and a larger magnification ratio is achieved.

The present disclosure discloses a bidirectional isolated DC-DC converter, which comprises two ports, two voltage and current isolated acquisition units, a processing module, two filtering-circuit units, and a bidirectional power-converting module. One of the two ports is selectively used as an input terminal of the bidirectional isolated DC-DC converter, and another of the two ports is used as an output terminal. The two voltage and current isolated acquisition units are connected with the two ports respectively to sample voltages and currents at the two ports and generate corresponding feedback signals. The processing module receives the feedback signals and outputs corresponding control signals according to the feedback signals. The bidirectional power-converting module is connected via the two voltage and current isolated acquisition units to the two ports to perform the conversion of different voltages between the two ports according to the control signals output by the processing module.

The presented multiuser transmission scheme, which combines intelligent antenna technique and applied on down link of TD-SCDMA system, comprises: taking channel estimation to RF receiver sampling data of every antenna array element by known user train sequence to obtain all channel states and then the assignment weight values of down beam of intelligent antenna; finally, applying the multiuser transmission system for pre-balance according to former weight value and user channel state. This invention is practical to improve system performance.

The invention relates to a method for producing titanium and stainless steel composite coils by rolling in a rolling mill. The green body structure used in the present invention is: a lower stainless steel plate, a lower titanium plate, an isolation layer, an upper titanium plate, and an upper stainless steel plate stacked in sequence from bottom to top. The upper stainless steel plate and the lower stainless steel plate are connected by two The upper stainless steel plate, the lower stainless steel plate, and the sealing plate cooperate to form a closed cavity, and the upper titanium plate, isolation layer, and lower titanium plate are placed in the closed cavity, and there are reserved holes in the closed cavity. The extension space of the upper titanium plate and the lower titanium plate. By adopting the method of stacking and assembling blanks, the present invention effectively avoids warping and buckling phenomena. In addition, by using a Steckel rolling mill, the present invention can realize hot rolling of titanium and stainless steel composite coils with a thickness of ≤10mm, and can effectively prevent the temperature drop of the rolled piece during the rolling process.

The invention discloses a multiple nano-rod dimer array structure, a manufacture method thereof, a method for exciting the Fano resonance of the multiple nano-rod dimer array structure, and an optical sensor comprising the multiple nano-rod dimer array structure. In the structure, appropriate refractive index, transverse gaps, longitudinal gaps and lengths are selected, such that the structure has good Fano resonance characteristics. Under the vertical effect of incident light with an electric field polarization direction parallel to a nano-rod long axis direction, the Fano resonance of the structure is strongly excited. With the structure, the sensitivity of the optical sensor can be greatly improved. Therefore, the invention has important influence on the improvement of the performance of optical sensors.

The invention discloses a hydraulic support welding system and method. The hydraulic support welding system comprises at least one welding workstation, positioners, a logistics trolley, guide rails and a control system. Each welding workstation comprises two welding robots. The guide rails comprise the main guide rail and the auxiliary guide rails perpendicular to the main guide rail, the welding workstations are sequentially arrayed along the main guide rail, and the auxiliary guide rails are arranged between the positioners and the welding workstations. The welding workstations are provided with laser tracking sensors. The two welding robots of each welding workstation, the positioners and the logics trolley are connected with the control system. When the welding system and method are used for performing assembly welding on connecting rods, the model of the connecting rods is automatically recognized, so that the uniformity of welded joints is good.

The invention relates to a seven-degree-of-freedom double-module parallel cooperative robot for a 3C assembly. The robot comprises a frame assembly, a three-movement and one-rotation parallel mechanism and a pure-rotation three-degree-of-freedom mechanism. The three-movement and one-rotation parallel mechanism comprises: four driving branched chains, each comprising a sliding block and a connecting rod assembly, wherein the sliding blocks are arranged to move in the linear directions parallel to one another, and one end of each connecting rod assembly is connected with the corresponding sliding block through a spherical pair; and a movable platform, connected with the other end of the connecting rod assembly of each driving branched chain through a spherical pair. The pure-rotation three-degree-of-freedom mechanism comprises: a pure-rotation platform; a central rotating branched chain, wherein the upper end of the central rotating branched chain is connected with the bottom of the pure rotating platform through a universal coupling, and the lower end of the central rotating branched chain is connected with a supporting column installed on a base through a spherical pair; and three linear driving branched chain, each comprising a linear sliding piece and a push rod assembly, wherein the lower end of each push rod assembly is connected with the corresponding linear sliding piece through a spherical pair, and the upper end of each push rod assembly is connected with the edge of the bottom of the pure-rotation platform through a spherical pair.

The invention discloses a control circuit for a five-level full-bridge inverter and designs a new modulation strategy specific to the problem that the traditional five-level full-bridge inverter modulation strategy is relatively low in efficiency when high power output is achieved. An operation mode when output of the five-level full-bridge inverter is minus or plus E is changed into a new mode with low switching loss, and a switching tube operating in a process of switching to the new mode belongs to soft switching when being turned on or off, so that conversion efficiency of a five-level inverter is improved, and the five-level inverter has a broad application prospect in the field of multi-level power electronic converters.

The invention discloses an off-axis total reflection projection objective lens optical system. A visual field off-axis is employed by the optical system, a secondary lens is arranged on a system optical axis, an aperture diaphragm is arranged on the secondary lens, and a primary lens and a third lens leave the system optical axis in opposite directions. Light is converged after being reflected bythe primary lens, is diverged and emitted after being reflected by the secondary lens and is focused to an image surface after being reflected by the third lens. At the same time, a folding mirror isadded into an optical path, a tube length can be reduced further, and object images are at two sides of an objective lens. Light from an object plane at a limited distance is projected on an image surface position according to a certain magnification by a projection object lens. The system has the advantages of good imaging quality, a short tube length and a symmetrical structure, a residual aberration caused by a finite distance of the object can be corrected by bending a curved surface radius and adjusting an aspheric coefficient, the system can be applied to various wave bands such as ultraviolet, visible and infrared bands, at the same time, a problem of the degradation of imaging quality caused by an excessive color difference of a traditional transmission projection objective lens ina wide band is solved.