35results about How to "Improve handling quality" patented technology

A cord material suitable for use in lined textile structures with a gliding component includes a plurality of uniform strands, and a deviant strand. The deviant strand is different from the uniform strands in some characteristic affecting aerodynamic or hydrodynamic properties of the cord, such as size or surface properties. Each uniform strand can have a substantially equal cross section area, while the deviant strand has a cross section area at least five times greater than one of the uniform strands. The strands can be braided or woven together. A major benefit of the material can be that vibration induced drag is significantly reduced or eliminated in lines made with the material. Another advantage is that lines made from the material can have more consistent, predictable line drag, which can improve the quality of handling.

An improved gas block for a firearm has a first longitudinal bore for receiving a firearm barrel, the barrel having a gas port, the gas block having a second longitudinal bore for receiving a gas tube or operating element. The block includes a vertical bore aligned with the barrel gas port and connecting the first and second block bores and permitting passage of cartridge gas from the barrel gas port to the gas tube. The improved gas block may include a military rail, forward of the gas tube, the forward location permitting the rail and accessories to lie close to the barrel, improving handling and reducing bulk. The barrel may include a conical cavity generally opposite the gas port. The block may include a conical point set screw adapted to mate with the barrel conical cavity, the screw when tightened forcing alignment of the block vertical bore with the barrel gas port and simultaneously clamping the block to the barrel. An installation device provides a means for forming a conical cavity in the barrel surface.

The present invention relates to a polarizing plate protective film base comprising a laminated film comprising a biaxially oriented polyester film and a coating layer provided on one side of said biaxially oriented polyester film,

• • the surface resistance of said coating layer being not more than 1×10¹¹Ω,
  • the adhesive force (P2) of the coating layer surface with an acrylic adhesive being not more than 3,000 mN/cm, and
  • the difference between adhesive force (P1) of the coating layer surface with a rubber adhesive and adhesive force (P2) with an acrylic adhesive (P1−P2) being not less than 100 mN/cm.

A method of controlling the flight of a rotorcraft in a feed-forward/feedback architecture includes utilizing an aircraft plant model to control the rotorcraft performance; determining when an external load is coupled to the rotorcraft; and modifying an inverse plant when the external load is present.

The invention provides a system and a method for an unmanned boat for shake reducing and stability increasing based on pitch-rotational speed differential. The system comprises four parts of a propulsion part, a propulsion control part, a tail rudder part, and a tail rudder control part. The propulsion part comprises a left variable pitch propeller, a left drive mechanism, a right variable pitch propeller, and a right drive mechanism, wherein the left variable pitch propeller and the right variable pitch propeller are opposite in steering, and rolling moment is generated by the pitch-rotational speed differential while generating thrust; the propulsion control part comprises a rolling angular rate gyroscope, a rolling angular rate commander, and a rolling angular rate controller for rolling stability increasing and control; the tail rudder part comprises a left rudder, a left steering gear, a right rudder, and a right steering gear, and the left rudder and the right rudder are simultaneously deflected to generate yawing moment; and the tail rudder control part comprises a yawing angular rate gyroscope, a yawing angular rate commander, and a yawing angular rate controller for yawingstability increasing and control. According to the system and the method for the unmanned boat for shake reducing and stability increasing based on the pitch-rotational speed differential, the rolling and yawing operation quality can be improved by taking the pitch-rotational speed differential of the double propeller and the synchronous deflection of a double control surface as the shake reducing and stability increasing mode of the unmanned boat.

The invention discloses a design method of the influence of the deformation difference between an airplane and a mechanical control system on maneuvering control. The design method comprises the following steps: (1) according to requirements of resultant force and the resultant moment of force during airplane maneuvering, the control surface skewness needed by longitudinal and transverse course maneuvering during airplane maneuvering is calculated; (2) the deviation of deformation of the mechanical control system relative to the airplane in the airplane maneuvering process is calculated; (3) control displacement and control force of a cockpit of the airplane in the airplane maneuvering process are calculated; and (4) according to different object overloads during airplane maneuvering, thestep (1) to the step (3) are repeated, and the rod force gradient and the rod displacement gradient of the target overloads corresponding to the control displacement and the control force of the longitudinal and transverse course cockpit during airplane maneuvering are obtained. The real mechanical control system characteristic determining process of the airplane during flying and a real airplanemaneuvering control characteristic design determining method are achieved, consistency of flying and design is ensured, mechanical control system characteristic errors are corrected, safety of airplane flying is improved, and the control quality is improved.

The invention provides an unmanned boat rotational speed differential anti-rolling stability augmentation system and method. The unmanned boat rotational speed differential anti-rolling stability augmentation system comprises a propulsion part, a propulsion control part, a sternpost rudder part and a sternpost rudder control part. The propulsion part comprises a left propeller, a left driving mechanism, a right propeller and a right driving mechanism, the left propeller and the right propeller rotate in the opposite directions, and rolling moment is generated by rotational speed differential while generating thrust. The propulsion control part includes a rolling angular velocity gyroscope, a rolling angle velocity commander and a rolling angular velocity controller, and is used for rollingstability augmentation and control. The sternpost rudder part includes a left rudder, a left steering engine, a right rudder and a right steering engine, and the left rudder and the right rudder aresimultaneously deflected to produce yawing moment. The sternpost rudder control part includes a yawing angular velocity gyroscope, a yawing angular velocity commander and a yawing angular velocity controller, and is used for yawing stability augmentation and control. The unmanned boat rotational speed differential anti-rolling stability augmentation system and method adopt the double-propeller rotational speed differential and the double-rudder-surface synchronous deflection as the anti-rolling stability augmentation mode of an unmanned boat, and the rolling-yawing control quality can be improved.

The reversible power-assisted control system comprises an operation pull rod, a steering wheel and a universal ball shaft, pedal devices are located on the two sides of the operation pull rod, the pedal devices are in hydraulic connection with a power assisting device, and the universal ball shaft is connected with the stability augmentation device through a connecting device. The stability augmentation device comprises a support, a sleeve and a first transmission gear, the support is a fixing piece, the sleeve is connected to the support in a sliding mode through a first extrusion spring, the spring is in a compressed state, the sleeve is further provided with threads, the sleeve is in threaded fit with the connecting device, and when the universal ball shaft drives the connecting device to rotate, under the action of the threads, the sleeve is driven to rotate. The first compression spring is further compressed. According to the reversible power-assisted control system, the problem that the airplane pedal is difficult to operate is solved through the power-assisted device, and the control performance is more effectively and directly improved by additionally arranging the stability augmentation device.

The invention relates to the field of building materials, in particular to a high-hardness three-layer co-extrusion wood plastic profile. The high-hardness three-layer co-extrusion wood plastic profile comprises four moving structures, two handling grooves, a driving structure, a support plate, first limiting structures, a fixing structure, a protection structure, second limiting structures, mounting structures and four clamping blocks. The two handling grooves of a rectangular structure and for handling the support plate are formed in the moving direction of the shorter sides of the bottom end of the support plate. The four moving structures for handling the support plate are arranged at four corners of the bottom end of the support plate. The driving structure for driving the sliding ofthe moving structures is disposed in the support plate. The first limiting structures for fixing the wood plastic profile are arranged at the top end of the support plate, and the first limiting structures are provided the second limiting structures for adjusting the stability of the wood plastic profile. Through the arrangement of the handling grooves of a rectangular structure at the bottom endof the support plate, the wood plastic profile is conveniently transferred by a forklift, and the first limiting structures are matched with the second limiting structures to facilitate fixation of the wood- plastic profile layer by layer, so that the stability of the fixation of the profile is improved.