218results about How to "Symmetrical" patented technology

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 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 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 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 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 adopted in the present invention is as follows: including the lower stainless steel plate, the lower titanium plate, the isolation layer, the upper titanium plate, and the upper stainless steel plate stacked in sequence from bottom to top, and the upper stainless steel plate and the lower stainless steel plate are arranged through two The sealing strips around them are connected, and the upper stainless steel plate, the lower stainless steel plate, and the sealing strip cooperate to form a closed cavity, and the upper titanium plate, the isolation layer, and the lower titanium plate are set in the closed cavity, and there are reserved spaces in the closed cavity. The extension space of the upper titanium plate and the lower titanium plate. The present invention effectively avoids warped heads and buckled heads by adopting the method of stacking blanks and assembling blanks. In addition, the present invention can realize the hot rolling of titanium and stainless steel clad coil with a thin specification of ≤10mm by adopting the rolling of the steckel mill, and can effectively prevent the temperature drop of the rolled piece during the rolling process.

The invention discloses a flat plate folding and unfolding unit. The flat plate folding and unfolding unit comprises a folding and unfolding mechanism and a support mechanism side, wherein the supportmechanism side is above the folding and unfolding mechanism; the support mechanism side is connected with the folding and unfolding mechanism through a vertical support rod; components of the flat plate folding and unfolding unit are connected directly through revolute pairs, so that the structure is simple and reasonable; a folding and unfolding direction of the support mechanism side is fully vertical to the folding and unfolding direction of an antenna flat plate, so that the support rigidity is improved, and the unit unfolding structure is more stable. The invention further discloses a flat plate folding and unfolding antenna mechanism. The mechanism is formed by connecting the plurality of flat plate folding and unfolding units; the flat plate folding and unfolding units are totallyidentical and are symmetrical in structure; and the flat plate folding and unfolding units are directly connected without auxiliary pieces, thereby being convenient to manufacture and assemble, expanding strongly, being capable of making up large flat plate folding and unfolding antenna mechanisms in any length contracting highly according to needs, and being highly practical.

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.