41 results about "Angular stability" patented technology

A bone plate system for osteosynthesis comprises a bone plate, a swivel screw, a clamping screw, a swivel hole formed in the bone plate as a through hole for receiving the swivel screw polyaxially, and a clamping hole, which is associated with the swivel hole and is formed in the bone plate as a further through hole for receiving the clamping screw. When the swivel screw and the clamping screw are screwed in, they are fixed with angular stability in multiple dimensions, as the screw heads of the swivel screw and of the clamping screw are secured by one another and by the bone plate against relative movement. The swivel screw and the clamping screw are each designed as a bone screw.

An airborne system for producing electricity from wind energy includes a shaft, wind turbines rotatably mounted to the shaft and arranged to rotate independently in opposite directions when subjected to the same wind, and generators arranged to convert rotation of the turbines into electricity. A lifting section includes combination of kites and lighter than air balloons, generating a lifting force that caused the system being airborne at desire altitude. The center of gravity of the system is lower than the center of lift of the system; when the turbines of the system exposed to wind and start to rotate, torques are inducing on the shaft of the system these torques are balancing each other and the remaining deferential torque being balanced by returning torque that is generated by the angular deviation of the center of gravity from it's lowest position, the magnitude of this returning torque, increasing as the angular deviation increased, until the system reach angular stability; electricity is generating and conducted through tether to an anchoring section for usage.

The invention discloses an aperture multi-layer structure-based high-out-of-band rejection frequency selective material design method. The method includes the following steps that: (1) a frequency selective material is designed based on an aperture multi-layer structure, wherein the aperture multi-layer structure includes three layers of structures, namely, a top-layer patch, a bottom-layer patch and a middle coupled aperture layer; (2) an out-of-band transmission null characteristic is realized through constructing a design method of patch displacement of the top-layer patch and the bottom-layer patch, and the side band cut-off characteristic of the aperture multi-layer structure-based frequency selective material can be further improved; and (3) a unit interdigital technology is adopted to carry out miniaturization processing on the surface of the frequency selective material, so that the unit size of the surface of the frequency selective material can be decreased. With the method of the invention adopted, a high-order coupling characteristic is realized, and the side band cut-off performance of the frequency selective material can be improved; and the unit interdigital method is adopted, so that the unit size of the surface of the frequency selective material can be decreased, and angle stability under the incoming of electromagnetic waves can be improved; and the out-of-band rejection ability of the frequency selective material is stronger, and the pass-band edge rise performance and sharp drop performance of the frequency selective material are better.

An airborne system for producing electricity from wind energy includes a shaft, wind turbines rotatably mounted to the shaft and arranged to rotate independently in opposite directions when subjected to the same wind, and generators arranged to convert rotation of the turbines into electricity. A lifting section includes combination of kites and lighter than air balloons, generating a lifting force that caused the system being airborne at desire altitude. The center of gravity of the system is lower than the center of lift of the system; when the turbines of the system exposed to wind and start to rotate, torques are inducing on the shaft of the system; these torques are balancing each other and the remaining deferential torque being balanced by returning torque that is generated by the angular deviation of the center of gravity from it's lowest position, the magnitude of this returning torque, increasing as the angular deviation increased, until the system reach angular stability; electricity is generating and conducted through tether to an anchoring section for usage.

Airborne system for producing electricity from wind includes at least one shaft, one or more wind turbines rotatably mounted to each shaft, and generators that convert rotation of the turbine(s) into electricity. A lifting section is connected to the shaft(s) and generates a lifting force that causes the system to be airborne. A center of gravity of the system is lower than its center of lift. When the turbines are exposed to wind and rotate (at least one in one direction and another in an opposite direction), torques induced on the shaft(s) of the system balance each other and remaining deferential torque is balanced by returning torque that is generated by the angular deviation of the center of gravity from its lowest position. A magnitude of this returning torque increases as the angular deviation increases until the system reach angular stability. Electricity is generated and conducted for storage or usage.

The invention discloses an ultra-wide passband frequency selective surface capable of improving angle stability and a design method thereof. The frequency selective surface is formed by five layers: a first metal patch layer, a first intermediate medium layer, a second metal patch layer, a second intermediate medium layer and a third metal patch layer, which are laminated in sequence. The ultra-wide passband frequency selective surface ensures that a frequency selection structure has super-wide passband characteristics, and meanwhile, has stable performance under the condition of large-angle incidence; the frequency selection structure can be combined with the majority of thickness of skins, housings and protective covers and the like freely; and the ultra-wide passband frequency selective surface has a very high practical value.

The invention relates to a concentrated configuration type cross-shaped annulus passband frequency selection surface with high angle stability, which belongs to the technical field of microwave. The frequency selection surface takes a cross-shaped ring as a resonance unit; two equivalent cross-shaped rings exist in one local period unit; a complete cross-shaped ring is arranged at the center point of each local period unit; a quarter of one cross-shaped ring is arranged at each top point of each local period unit; and the distance between every two adjacent centers of the local period units is 0.34-0.36 times the resonant wavelength of an electromagnetic wave. According to the invention, the structural parameters are few; the designed optimization time is short; the frequency selection surface is suitable for big-angle incidence, a central frequency point is hardly drifted when an incidence angle is changed in the range of 0-60 DEG; and with the increase of the incidence angle, the passband transmissivity is reduced slightly, but is still high, and can meet the application requirements on engineering.

The invention provides a 2.5D braided structure-based high-angular stability frequency selective surface and aims at improving the angular stability of the frequency selective surface. The 2.5D braided structure-based high-angular stability frequency selective surface comprises M*N passive resonance units, wherein each passive resonance unit comprises a dielectric slab, a first metal patch printedon the upper surface of the dielectric slab, a second metal patch printed on the lower surface of the dielectric slab, and metallized through holes; each first metal patch comprises six rotational symmetric first strip groups; each second metal patch comprises six rotational symmetric second strip groups; various strips in the second strip groups are located in gaps, in corresponding positions onthe lower surface, of various corresponding strips in the first strip groups; and the strips in the first metal patches and the second metal patches are connected through the corresponding metallizedthrough holes which penetrate through the dielectric slabs to form a 2.5D braided structure. According to the 2.5D braided structure-based high-angular stability frequency selective surface, good angular stability is achieved on the basis of miniaturization, and the 2.5D braided structure-based high-angular stability frequency selective surface can be applied to the aspects of communications andradars.

The invention provides a robot. An independent and active suspension device cooperated with an undercarriage device is designed in the robot to ensure the stability of a body and obtain the most flexible exercise performance, the robot not only can travel like general vehicles, but also can spin in place and walk all around, and when the robot turns around while walking, the robot also has the smallest turning radius and does not occupy space, the robot has the advantages of excellent abilities to climb slopes, climb stairs and climb obstacles and can cross the 45-degree steep slope. In addition, according to the robot system, the body height can be changed adaptively at any time, by adopting the telescopic neck of the robot, the location of the center of mass can be changed, the view of the neck can also be increased by adjusting, and the angle stability of the neck of the robot in three axial directions is ensured and the vibration of the body caused by the rough of the ground in motion is relieved, and the body of the robot on the move is stable and will not dump.

The invention relates to a wide-angle latex-dipped canvas and a production process thereof, belonging to the technical field of textile. The production process comprises the steps of angle adjustment, weaving, latex dipping, drying, shaping and packaging. The weaving included angle between the warp thread and the fill thread of cloth weaved by the process is 1-179 degrees, and the outer surface of weaved wide-angle canvas is soaked with a layer of latex. The invention has the advantages that a warp and fill thread has high angle stability, and the product has strong adhesivity; when in use, the product can be processed by mechanical latex spreading, latex pasting, dipping and latex scraping, and the angles of the warp and fill threads of canvas are not changed. With high finished productrate, simple production process and low cost, the wide-angle latex-dipped canvas can be used as the framework of rubber, plastic and such products or used as wrapping material.

The invention relates to the application field of a metamaterial frequency selection technology and discloses a three-dimensional band-pass frequency selection structure and a manufacturing method thereof. The three-dimensional band-pass frequency selection structure includes: a plurality of band-pass frequency selection units distributed periodically, each band-pass frequency selection unit comprises a surface plasmon panel unit and a metal square-hole honeycomb having a length by width by height of a by b by h, A surface plasmon panel unit is connected with a metal square hole honeycomb along a height direction, The surface plasmon panel element passes through the center point of the metal honeycomb and is parallel to the panel of length a in the metal honeycomb. This three-dimensional band-pass frequency selection structure not only realizes the wideband filtering, but also improves the frequency cutoff effect and has good angular stability. The mechanical properties of frequency selective structure areenhanced by introducing metal honeycomb.

A downhole apparatus for cutting casing and rock when radial drilling defined by a cutting head that includes three or more cutting edges positioned around the cutting head's axis of rotation, at least three of the cutting edges in continuous contact with the face of the material being cut, thereby providing lateral and angular stability to the cutting head, one or more internal fluid passageway within the cutting head and one or more orifices for ejecting drilling-fluid out of the cutting head.

The invention discloses a branch-loaded three-band composite microwave absorbing structure based on a frequency selective surface, belonging to the field of electromagnetic field and microwave communication. An upper dielectric layer, a frequency selection surface and a lower dielectric layer sequentially are arranged from top to bottom; a passive resonance unit of the frequency selective surfacecomprises a three-band absorbing structure and a square ring patch for absorbing a specific wave, the square ring patch being arranged on the three-band absorbing structure, the three-band absorbing structure comprises an arm-removed rectangular Jerusalem cross-shaped patch and a branch perpendicular to each other, the square ring patch and the Jerusalem cross-shaped patch are arranged in a centercoinciding manner, and the arm-removed rectangular portion of the Jerusalem cross-shaped patch is connected with four end points of the branch. The invention solves the problems that the angular stability and the microwave absorption performance of the cross-shaped structure in the existing frequency selective surface are poor, and the square ring structure can only absorb single frequency bands,and achieves the effects of improving the angular stability and absorbing waves in three frequency bands.

A one-piece piston having an investment or other permanent or non-permanent mold/die precision cast piston crown, rod flange and piston skirt. The piston crown has a relative constant thickness, a flange requiring minimal machining and a skirt providing for a wall with a support against the angular shifting of the piston. This improves the distribution of heat within such crown and the angular stability of the piston wall at the piston rod connection.

The invention relates to a frequency selection surface structure applied to 5G communication and a unit structure thereof. The unit structure comprises a first dielectric substrate, a metal layer anda second dielectric substrate which are arranged in order from top to bottom, wherein the metal layer is provided with an improved Jerusalem gap and an improved square-ring gap; the improved square-ring gap surrounds the periphery of the improved Jerusalem gap, and the center of the improved Jerusalem gap and the center of the improved square-ring gap coincide with the center of the metal layer. The frequency selection surface structure comprises M*N periodically arranged unit structures. The frequency selection surface structure comprises dual-band band-pass features of 28GHz and 39GHz, and agood filtering effect; and moreover, the frequency selection surface structure has excellent polarization stability and angle stability, and when incident waves are incident at different angles in different polarization modes, the resonance frequency is always within a 5G frequency band.

An insulating glass (IG) window unit including first and second glass substrates that are spaced apart from each other. At least one of the glass substrate has a triple silver low-emissivity (low-E) coating on one major side thereof, and a dielectric coating for improving angular stability on the other major side thereof.

The invention discloses a frequency selective surface structure, which comprises an upper dielectric layer, a frequency selective surface and a lower dielectric layer. The frequency selective surfaceprovided by the invention is a composite structure of Jerusalem cross-shaped structures loaded with branches, a passive resonant unit of the frequency selective surface is composed of four Jerusalem cross-shaped structures and two mutually perpendicular branches, the Jerusalem cross-shaped structures are connected at four endpoints of the two mutually perpendicular branches, and the connection point is the endpoint of the cross-shaped frame with one arm rectangle being removed of the Jerusalem cross-shaped structure. The S11 parameter of structure reaches -15db within the wave absorbing rangeof 6-8GHZ, the structure has a great wave absorbing peak between 2.2-2.8GHZ and 11-12GHZ, has an excellent wave absorbing effect within three absorption bands of an incident wave angle below 45 degrees and possesses very good angle stability. The structure can be applied to various fields such as communication, environmental protection and human body protection.