35results about How to "Multiple Design Freedom" patented technology

The invention discloses a pupil shaping unit structure of a lithography machine and a design method for a diffraction optical element of the pupil shaping unit structure. The pupil shaping unit structure comprises a cascade diffraction optical element and a varifocal collimating lens group, wherein the cascade diffraction optical element comprises a first diffraction optical element and a second diffraction optical element; the light transmittance surfaces of the two diffraction optical elements are perpendicular to the optical axis of a lighting system; the two diffraction optical elements are pure phase elements. The design method for the cascade diffraction optical element comprises the following steps of calculating a period of a phase unit; enabling a light beam to be incident, determining the light intensity distribution of the required optical beam and performing discretization processing; entitling initial phase matrixes of the first diffraction optical element and the second diffraction optical element; performing quantification processing through an iteration algorithm to obtain quantified phase matrixes of the first diffraction optical element and the second diffraction optical element; evaluating a design result.

The invention belongs to the fields of radar technology and wireless communication technology, and particularly relates to a low-profile lens antenna based on reflective array feed. The low-profile lens antenna comprises a primary feed source, a flat plate reflective array which is positioned below the primary feed source and on which reflective array units are printed, and a lens positioned above the primary feed source; the primary feed source is used for feeding the reflective array, the reflective array is used for compensating an electromagnetic wave phase position by adjusting cell size so that amplitude distribution of electromagnetic waves applicable to target body application is formed at the position of the lens, and then directed radiation is formed through lens phase position compensation. The low-profile lens antenna has the characteristics of low profile, easy conformal shape, low cost, low loss and light weight, and can be used in microwave, millimeter-wave radar and wireless communication systems with low-profile requirement for high-gain antennas.

A common-path flexible off-axis four-mirror zoom optical system relates to the technical field of aerospace optical remote sensors, solves the technical bottleneck of earth observation of an existingspace remote sensing camera, and comprises a primary mirror, a secondary mirror, a third mirror and a fourth mirror, wherein the primary mirror serves as a fixed mirror and is fixed relative to the optical axis of the system; the secondary mirror, the third mirror and the fourth mirror are a total-reflection zoom system composed of three movable mirrors; the secondary mirror is a negative power mirror; the secondary mirror is moved to be located in the Cassegrain optical structure; the secondary mirror is a flexible deformable mirror, and the vertex of the secondary mirror moves along the optical axis direction of the system; the third mirror and the fourth mirror are both positive power mirrors, and the vertexes of the third mirror and the fourth mirror move along the optical axis of thesystem; and light sequentially passes through the primary mirror, the secondary mirror, the third mirror and the fourth mirror and is finally imaged on the image plane of a detector. The total-reflection zoom system provided by the invention realizes light path sharing, and the aberration of the system is corrected by combining the flexible deformable mirror, so that the ultra-light weight of themulti-channel optical system is realized.

The invention discloses an optical imaging lens group. The zoom lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens withfocal power from an object side to an image side along an optical axis, wherein at least one lens surface from the object side surface of the first lens to the image side surface of the seventh lensis an aspheric surface in non-rotational symmetry; the optical imaging lens group has a first direction and a second direction which are perpendicular to each other on a plane perpendicular to the optical axis, and a part of optical parameters in the first direction are different from a part of optical parameters in the second direction; and in the first direction, half ImgH of the diagonal lengthof the effective pixel region on the imaging surface of the optical imaging lens group meets the condition that ImgH is greater than 5mm.

The invention discloses a broadband miniaturized metasurface antenna based on double-layer capacitive loading, which adopts three layers of dielectric substrates which are stacked from top to bottom,and comprises a first layer of dielectric substrate, a second layer of dielectric substrate and a third layer of dielectric substrate, wherein a metal parasitic patch structure for capacitive loadingis printed on the upper surface of the first layer of dielectric substrate, and the metal parasitic patch structure comprises a plurality of parasitic patch units which are periodically arranged; a metasurface radiation structure is printed on the upper surface of the second dielectric substrate, and a metal floor with a coupling gap is printed on the lower surface of the second dielectric substrate; the metasurface structure comprises a plurality of independent metasurface patch units and gaps among the units; the upper surface of the third dielectric substrate is attached to the metal floor,and the lower surface is printed with a feed network. According to the invention, miniaturization is effectively achieved while the broadband characteristic is guaranteed, and the high gain characteristic can still be guaranteed while the size is reduced.

The invention relates to a machine tool with an electrical generator for passive power generation. The machine tool is provided with a generator (3) for generating electrical power is disclosed. The generator (3) has a rotor (7) and a stator (5). A coil (11) and a magnet (13) are arranged on the stator (5). The rotor (7) is capable of moving relative to the stator (5) and has a first region (51) and a second region (53). The rotor (7) is configured in such a way that, during a movement (63) of the rotor (7) relative to the stator (5), a magnetic flux in the coil (11) is changed due to differences between the first and second regions (51, 53) in terms of their magnetic permeability and / or in terms of their geometric configuration, and an electrical voltage is induced.

The invention discloses a broadband miniaturized antenna based on an interactive embedded metasurface structure. The antenna comprises an upper-layer dielectric substrate and a lower-layer dielectricsubstrate which are placed in a double-layer stacking mode, wherein an interactive embedded metasurface radiation structure is printed on the upper surface of the upper dielectric substrate, a metal floor with a coupling gap is printed on the lower surface of the upper dielectric substrate, the upper surface of the lower dielectric substrate is attached to the metal floor, and the lower surface isprinted with a feed network. According to the invention, energy is input from a feed network and is coupled to an interactive embedded metasurface radiation structure through a coupling gap on a metal floor to directionally radiate the energy upwards, so that the miniaturized metasurface antenna with the characteristics of broadband, stability, high gain and low profile is realized; miniaturization is realized while the bandwidth is broadened; due to the diversity selection of the gap, the design freedom degree is improved while certain periodicity is guaranteed; and the antenna is simple instructure, easy to process, relatively low in cost and weight and capable of being produced on a large scale.

The invention belongs to the field of antennas of electronic communication technology, and relates to a package substrate distributed antenna. The antenna structure is distributed and designed on a package and a substrate, low-loss interconnection of electromagnetic signals from the package to the substrate is realized through coupling inside the antenna instead of conductor connection, and the package and the substrate are interconnected through electromagnetic coupling. With application of the radiation structure integrated on the substrate, electromagnetic waves coupled by the package are radiated in a specific mode. The package substrate distributed antenna is multiplexed by changing the substrate, and the multiplexing of the package substrate distributed antenna is realized by changing the radiation structure on the substrate without changing the package. The internal interconnection loss of the antenna is reduced, the limitation of the working frequency band of a chip package distributed antenna is solved, the realization of a millimeter wave low-frequency-band distributed antenna becomes possible, more design freedom degrees and flexibility are brought to the design of the millimeter wave antenna, the design period and cost of the millimeter wave integrated antenna are reduced, and the multiplexing of the package design is realized.

The invention discloses an acoustoelectric shared coding metamaterial and an application thereof to a cloaking device. The metamaterial is formed by periodically arranging n-bit acoustoelectric sharedcoding units in a two-dimensional plane according to pre-designed coding states, the number of the coding states is 2n, and the phase difference is degree; a basic unit structure of each acoustoelectric shared coding unit is an aluminum helmholtz resonator, and electromagnetic waves and sound waves which are vertically incident are subjected to reflection regulation by adjusting geometrical parameters of the acoustoelectric shared coding units; and the metamaterial is used as a surface material of the cloaking device. The metamaterial is designed based on a single material, is simple in structure and easy to process, can perform beam deflection, beam forming and abnormal reflection on the sound waves and the electromagnetic waves at the same time, and can also be used for reducing the scattering cross section of a radar or a sonar of a target; the metamaterial can be regarded as a combination of an electromagnetic reflection array antenna and a sonar array, and has a potential application prospect in safety detection or target detection of a few complex scenes.

The invention discloses a broadband metamaterial wave-absorbing structure with angle and polarization insensitivity. The wave-absorbing structure comprises a metal patch unit, a dielectric substrate and a lower metal floor which are sequentially pasted from top to bottom. The metal patch unit comprises a plurality of fan-shaped patches and a regular polygon patch; wherein the regular polygon patchis arranged at the center of the dielectric substrate, and the regular polygon patch is a regular octagon; the fan-shaped patches are circular and distributed on the outer side of the regular polygonpatch at equal intervals, and the circle centers of the fan-shaped patches are located on the vertex of the regular polygon patch. With application of the technical scheme in the invention, the broadband metamaterial wave-absorbing structure with angle and polarization insensitivity is designed, the wave-absorbing structure is applied to an antenna and has excellent wave-absorbing performance ina broadband range and can ensure the stability of antenna performance under different incident polarization directions and incident angles.

The invention discloses a blank holder of a stamping tool for a motor vehicle body lining, and relates to a stamping tool 2 for conducting open stamping. The blank holder allows the realization of a lining of a vehicle door. The stamping tool 2 includes recessed die, a terrace die 4 which is intended for inserting to a die cavity for the realization of the lining in molding a blank of a sheet metal part, and a blank holder which has a fastening surface 6 which can be spread. The fastening surface 6 formes an open ring which surrounds the terrace die 4. The terrace die 4 includes a part 12 which interrupts the fastening surface 6 so as to form open stamping. As as supplement, a spiral area 16 which fixes the blank upon stamping is included in the fastening surface 6. The spiral area 16 is opened towards the opened part 12 along the edge of the terrace die 4 so as to reduce stamping depth.

The invention discloses a train head model parameterization control method based on a four-order partial differential equation; the method comprises the following steps: 1, using the four-order partial differential equation to parameterize train head model surface patches; 2, calculating to obtain boundary conditions needed to solve the partial differential equation; 3, obtaining space positions of grid points corresponding to the partial differential equation numerical solution; 4, determining whether the error between the grid points corresponding to the partial differential equation numerical solution and a target point is smaller than a set threshold or not; 5, obtaining the grid point position corresponding to the partial differential equation numerical solution when the target pointis approached at the closest level and the corresponding partial differential equation so as to control patch local deformation parameters; 6, adjusting train head model shape control parameters so asto obtain a new train head model. The method utilizes a few parameters to not only control large scale deformation of the train head model, and can adjust the shape in a local small scope, thus providing more degree of freedom for train head model design and aerodynamic optimization.

The invention discloses a preparation method of a negative thermal expansion metamaterial sandwich panel based on topological optimization design. The preparation method comprises the following steps: (1) establishing an overall structure model of the negative thermal expansion metamaterial sandwich panel; (2) establishing a metamaterial-based structure finite element model for filling the sandwich panel; (3) inputting basic material parameters, constraint values and a finite element model of the metamaterial-based structure; (4) calculating values of an equivalent thermal expansion coefficient and an equivalent elastic modulus of the metamaterial and corresponding partial derivatives; (5) establishing an explicit optimization model, and solving through linear programming; (6) judging whether the equivalent thermal expansion coefficient convergence precision is met or not, and if the equivalent thermal expansion coefficient convergence precision is not met, returning to the fourth step; and if the equivalent thermal expansion coefficient convergence precision is met, inverting the optimal continuous topological variable until the equivalent elastic modulus requirement is met, to obtain an optimal topological structure; and (7) modeling the filled metamaterial, and filling the negative thermal expansion metamaterial in a periodic array between clamping plates to form the negative thermal expansion sandwich plate. The method has more design freedom degrees and better performance.

The present application discloses an optical imaging lens group, which sequentially includes: a first lens with refractive power, a second lens, a third lens, a fourth lens, and a fifth lens from the object side to the image side along the optical axis . The sixth lens and the seventh lens, wherein: at least one mirror surface from the object side of the first lens to the image side of the seventh lens is a non-rotationally symmetrical aspheric surface; the optical imaging lens group is perpendicular to the The plane of the optical axis has a first direction and a second direction perpendicular to each other, a part of the optical parameters in the first direction is different from the part of the optical parameters in the second direction; and in the first direction In terms of direction, the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens group satisfies: ImgH>5mm.

The invention provides a supergravity environment simulator adopting a lifting device and a test method of the supergravity environment simulator, and belongs to the technical field of scale model tests of underwater navigation bodies. The problems that complex three-dimensional flow is difficult to simulate, the size and the shape of a test piece are limited and the introduction of extra rotating torque is limited when a centrifugal technology is used in a supergravity scale model test are solved. The device comprises a launching device, a navigation body and a test device, the test device comprises a small-scale test device or a large-scale test device, the navigation body is arranged in a launching area, the small-scale test device realizes lifting of a water tank through a linear motor and a control system which are arranged in a sliding table elevator, and the large-scale test device realizes lifting of the water tank. The large-scale lifting device drives the lifting support to achieve lifting of the water tank through a driving device arranged in the dragging device. The device is mainly used for simulating the supergravity environment.

The invention discloses a light and small space camera optical-mechanical system, and the system comprises a main bearing assembly which is provided with bearing regions at the upper and lower parts and a supporting structure at the middle part; the primary mirror assembly and the third mirror assembly are respectively arranged at the lower part of the primary force bearing assembly through a primary mirror gasket and a third mirror gasket; the secondary mirror assembly and the fourth mirror assembly are respectively arranged at the upper part of the main bearing assembly through a secondary mirror gasket and a fourth mirror gasket; and the imaging focal plane assembly is close to the three-mirror assembly and is connected to the lower part of the main bearing assembly through an imaging focal plane gasket. The free-form surface off-axis four-mirror type optical system layout is adopted, more design freedom degrees can be released in cooperation with a truss type main force bearing configuration, the size and weight of the camera are effectively reduced, and non-blocking, large-view-field and high-quality imaging is achieved. The optical-mechanical system has the technical advantages of being compact in structure, large in width, high in image quality and the like, and the industrial application requirement of a high-resolution super-large-width space camera can be met.

The invention discloses a broadband miniaturized antenna based on an interactive embedded metasurface structure. The antenna includes an upper dielectric substrate and a lower dielectric substrate placed in a double-layered manner; the upper surface of the upper dielectric substrate is printed with an interactive embedded metasurface radiation structure, and the lower surface is printed with a metal floor with coupling gaps; the lower dielectric substrate The upper surface of the substrate is bonded to the metal floor, and the lower surface is printed with a feed network; the energy is input from the feed network, coupled to the interactive embedded metasurface radiation structure through the coupling gap on the metal floor, and the energy is directionally radiated upwards, thereby realizing Miniaturized metasurface antenna with broadband, stable high gain, and low profile. The present invention also widens the bandwidth while realizing miniaturization; in addition, the diversity selection of the slits ensures a certain periodicity and improves the degree of design freedom. The antenna of the invention has simple structure, easy processing, relatively small cost and weight, and can be mass-produced.

The invention relates to a compact off-axis imaging system based on a free-form surface substrate phase element, comprising: a main reflector, a primary reflector, a third reflector and a detector; the main reflector is used to square light to form a first reflected light; the secondary reflector is used to reflect the first reflected light twice to form a second reflected light; the third reflector is used to reflect the second reflected light again to form a third reflected light; the detector is used for receiving the third reflected light and forming an image. The primary reflector, the secondary reflector, and the third reflector are free-form surface base phase elements; the optical path of the first reflected light, the optical path of the second reflected light and the optical path of the third reflected light overlap each other , the system is compact.

This application discloses a broadband metamaterial wave-absorbing structure with angle and polarization insensitivity. The wave-absorbing structure includes a metal patch unit, a dielectric substrate, and a lower metal floor that are sequentially attached from top to bottom. The metal patch unit includes : A plurality of fan-shaped patches and a regular polygon patch; the regular polygon patch is set at the center of the dielectric substrate, wherein the regular polygon patch is a regular octagon; the fan-shaped patches are circular and equally spaced in the regular polygon On the outside of the patch, the center of the fan-shaped patch is located on the vertices of the regular polygon patch. Through the technical solution in this application, a broadband metamaterial absorbing structure with angle and polarization insensitivity is designed. This absorbing structure is applied to antennas and has excellent absorbing performance in a wide frequency range, and in Under different incident polarization directions and incident angles, the stability of the antenna performance can be guaranteed.

The invention discloses a polyamide foam material as well as a preparation method and application thereof. The polyamide foam material comprises the following raw material components in parts by weight: 85-98 parts of polyamide 5X resin and 0.5-5 parts of a chain extender, the pore size distribution of the foam material is 1.0 to 3.0. According to the invention, polyamide 5X resin is used as a raw material, a polyamide modified material meeting foaming requirements is prepared through chain extension modification, and then the bio-based polyamide foam material is prepared through continuous extrusion, foaming and molding by twin-screw extrusion foaming equipment. Or the polyamide 5X resin is subjected to online chain extension modification and continuous extrusion foaming molding in double-screw extrusion foaming equipment to prepare the bio-based polyamide foam material, and the bio-based polyamide foam material has the characteristics of low foam density, high foaming ratio, high compression strength, uniform average cell diameter and small pore size distribution.

The utility model belongs to the technical field of seats, and particularly relates to a passenger car seat turnover mechanism and a passenger car seat thereof.The passenger car seat turnover mechanism comprises a cushion support and a backrest support hinged to the rear end of the cushion support, and the two sides of the front lower portion of the cushion support are hinged to a car body mounting support through hinge shafts respectively; a seat turnover mechanism mounted on the vehicle body mounting bracket drives the cushion bracket and the backrest bracket to rotate through a transmission mechanism; the passenger car seat comprises the passenger car seat turnover mechanism, and has the advantages that the passenger car seat turnover mechanism is light in weight, small in occupied space and compact in structure, the rotation angle of forward turnover or backward turnover of the whole seat is more than 180 degrees, and the passenger car seat turnover mechanism is convenient for multipurpose use of space in a car and is used for the passenger car seat.

The invention relates to a power tool with a passive generator having a generator (3) for generating electric current. The generator (3) has a rotor (7) and a stator (5). Coils (11) and magnets (13) are arranged on the stator (5). The rotor (7) is movable relative to the stator (5) and has a first area (51) and a second area (53). The rotor (7) is constructed such that the magnetic permeability and / or geometry differs between the first and second regions (51, 53), so that when the rotor (7) moves (63) relative to the stator (5) ), the magnetic flux in the coil (11) will change, thereby inducing a voltage.

The invention belongs to the antenna field of electronic communication technology, and relates to a packaged substrate distributed antenna. The antenna structure is distributed and designed on the package and the substrate, and the low-loss interaction of the electromagnetic signal from the package to the substrate is realized through the coupling inside the antenna instead of the conductor connection. The package and the substrate are interconnected through electromagnetic coupling; through the radiation structure integrated in the substrate, the electromagnetic wave coupled from the package is radiated in a specific way. The packaged substrate distributed antenna is multiplexed by changing the substrate, and without changing the package, the radiation structure on the substrate is changed to realize the multiplexing of the packaged substrate distributed antenna. The invention reduces the loss of the internal interconnection of the antenna, solves the limitation of the working frequency band of the chip-packaged distributed antenna, makes it possible to realize the distributed antenna of the millimeter-wave low-frequency band, and brings more design freedom and flexibility to the design of the millimeter-wave antenna At the same time, it reduces the design cycle and cost of millimeter-wave integrated antennas, and realizes the reuse of packaging designs.

The invention relates to a wheel suspension, in particular for a vehicle body, comprising an axle limb (14, 46, 66) which supports a wheel (10) and has a first steering axle (16, 52, 64) for the wheel(10), said first steering axle (16, 52, 64) allowing a steering angle in a specified range, and comprising components (18, 20, 22; 40, 42, 44; 48, 56; 56, 74) for connecting the axle limb (14, 46, 66) to a support structure (38, 38'). In order to allow a steering angle of 90 degrees or more to be reached, at least one of the components (18, 20, 22; 40, 42, 44; 48, 56; 56, 74) has a selectively releasable second steering axle (30, 60, 70) in order to produce a steering angle other than the one defined by the first steering axle (16, 52, 64).

The application discloses a multi-stage center grading wide-range stable combustion chamber head, and relates to the technical field of combustion chambers. The multi-stage center grading wide-range stable combustion chamber head comprises a head outer ring shell, a second main combustion stage assembly, a first main combustion stage assembly and a plurality of xth main combustion stage assemblies. The second main combustion stage assembly comprises a second fuel supply cavity and second swirl vanes, and the second swirl vanes are provided with second fuel injection holes which are communicated with the second fuel supply cavity. The first main combustion stage assembly comprises a first fuel supply ring cavity and first swirl vanes, and the first swirl vanes are provided with first fuel injection holes which are communicated with the first fuel supply ring cavity. Each main combustion stage assembly comprises a fuel supply cavity and swirl vanes, and the form is the same as that of the second main combustion stage. The head outer ring shell is arranged for installation, positioning and forming a flow channel. The xth main combustion stage assembly, the second main combustion stage assembly and the first main combustion stage assembly are arranged, and the straight-flow air is changed into swirl flow by the swirl vanes. The fuel is injected out from the first fuel injection holes and the second fuel injection holes after entering the head outer ring shell from the outside.

The invention relates to a dependent six-connecting rod suspension structure for a vehicle. The structure comprises an upper left longitudinal draw rod (1), a lower left control arm (2), a rear whole bridge pipe (4), a left transverse draw rod (5), a middle rock arm mounting crossbeam (6), a middle rock arm (7), a right transverse draw rod (8), an upper right longitudinal draw rod (9) and a lower right control arm (10). The dependent six-connecting rod suspension structure disclosed by the invention has multiple degrees of design freedom, and the length of the longitudinal draw rod and mounting hard points are adjusted, so that the kinematic trajectory of a wheel center can be reasonably controlled, and a complete vehicle has the axioversion characteristic of good understeer trends. Compared with the dependent suspension of the whole five-connecting rod bridge type of a single horizontal push rod for universal application at present, the transverse play due to the vertical beating of the dependent suspension wheel of the complete multiple-connecting rod bridge type is minimized, and the running stability of the complete vehicle is improved, so that the phenomenon that the vehicle driven by rear wheels runs to one side can be clearly reduced.

The invention discloses a parameterized control method of a locomotive shape based on a fourth-order partial differential equation, which comprises the following steps: step 1: using a fourth-order partial differential equation to parameterize the surface patch of the locomotive shape; step 2: calculating and obtaining a solution The boundary conditions required by the partial differential equation; step 3: get the spatial position of the grid point corresponding to the numerical solution of the partial differential equation; step 4: judge the error between the grid point corresponding to the numerical solution of the partial differential equation in step 3 and the target point Whether it is less than the set threshold; Step 5: Obtain the grid point position corresponding to the solution of the partial differential equation and the corresponding parameters of the local deformation of the partial differential equation control surface when it is closest to the target point; Step 6: Adjust the shape control parameters of the train head , to obtain a new train head model; the invention can not only control the large-scale deformation of the train head model by using a small number of parameters, but also realize the local small-scale shape adjustment, providing more freedom for the train head shape design and aerodynamic optimization Spend.