2162results about How to "Improve maneuverability" patented technology

The present invention relates to a percutaneous insertion-capable lead, wherein insertion is made through a percutaneous insertion structure. For one embodiment of such lead, the electrode-supporting stimulation portion of the lead includes at lease one waisted region, relative to a transverse dimension of the lead, to facilitate lead steerability.

A system for percutaneously inserting a prosthesis containing a biological replacement for a defective valve into an implantation site through a body lumen. The system contains a balloon catheter upon which a collapsable stent containing a venous valvular replacement is mounted. A protective shield is slidably mounted upon the catheter that is movable between a closed position over the balloon and an open position wherein the balloon can be inflated to expand the stent. A central lumen runs through the catheter that is formed of stainless steel. The central lumen provides a one to one torque ratio between the proximal end of the catheter and the distal end to enhance the steerability of the catheter. The vein of the replacement is reduced in thickness between 50% and 90% of its original size thereby considerably reducing the size of the replacement package when the stem is collapsed upon the balloon of the catheter.

An improved percutaneous lead is provided. The lead has a circumferential, concave neck located on the distal portion of the lead and a stylet lumen traversing through the lead including through the concave neck. The concave neck has a narrower circumference than the remainder of the lead. The concave neck is designed to bend up to 45 degrees with a pre-curved stylet inserted into the stylet lumen. The presence of a concave neck permits the ingrowth of tissue into and around the concave neck, thereby helping to anchor the lead post-implant. The concavity in the neck presents no sharp edges to disrupt the isodiametric lead profile.

The invention discloses an ARM (advanced RISC (reduced instruction set computer) machines) and FPGA (field-programmable gate array) based navigation and autonomous flight control system for an unmanned helicopter. The system comprises a PC (personal computer), an integrated navigation subsystem, a power supply module and controllers, wherein the integrated navigation subsystem comprises a sensor group; the sensor group comprises a GPS (global positioning system), a gyroscope, an accelerometer, a magnetoresistive sensor, a barometric altimeter and a sonar altimeter; the controllers include a main controller and a steering engine controller; the main controller adopts an ARM microprocessor to operate the integrated navigation algorithm and flight control PID (proportion integration differentiation) algorithm and simultaneously completes data acquisition of the GPS, the barometric altimeter and the sonar altimeter; and the steering engine controller adopts an FPGA to realize data acquisition of the gyroscope, the accelerometer and the magnetoresistive sensor and transfers the data to the main controller via a concurrent bus to carry out attitude calculation and control operation on the unmanned helicopter. With the unmanned helicopter as a carrier, the hardware environment of a whole set of flight control system integrating study of the aircraft navigation and control theory problem, data acquisition, information transfer and embedded control is set up.

Sensor guide wire for intravascular measurements of a physiological variable in a living body, comprising: a sensor region in a distal part of the sensor guide wire, a sensor element arranged in the sensor region, a male connector at a proximal part of the sensor guide wire, a least one electrical micro-cable connecting the male connector to the sensor element and an elongated guide wire body arranged between the sensor region and the male connector. The at least one electrical micro-cable extends essentially helically around the guide wire body along the length of at least a part of the guide wire.

The invention provides a fixed-wing multi-shaft aircraft, and belongs to the field of aircrafts. The fixed-wing multi-shaft aircraft comprises a fixed wing and a multi-shaft rotor wing rack which are connected with each other, and the multi-shaft rotor wing rack is provided with multiple rotor wing mechanisms; the rotor wing mechanisms comprise propellers and rotating shafts, the propellers are rotatably connected with drive devices, the drive devices are fixedly connected with the rotating shafts, and the rotating shafts are connected with rotating control mechanisms. The fixed-wing multi-shaft aircraft has the advantages of both a fixed-wing aircraft and a multi-shaft aircraft, can achieve a multi-shaft mode, a fixed-wing mode and a fixed-wing and multi-shaft mixed mode and also has the advantages of achieving vertical taking-off and landing and hovering and being high in flying speed and long in flying time.

An adhesive encapsulating composition and an encapsulating film, which are useful as an encapsulant for an organic electroluminescence device or other electronic devices is provided. The adhesive encapsulating composition includes a hydrogenated cyclic olefin-based polymer and a polyisobutylene resin having a weight average molecular weight of 500,000 or more. Some embodiments of the adhesive encapsulating composition include a hydrogenated cyclic olefin-based polymer, a polyisobutylene resin having a weight average molecular weight of 500,000 or more, a photocurable resin, and a photopolymerization initiator.

A longitudinal, transverse and vertical force integrated control optimization method for electric vehicles driven by hub belongs to that technical field of electric vehicle control. The object of theinvention is to adopt a layered cooperative control structure so as to solve the four shortcomings existing in the prior art control system of a longitudinal, lateral and vertical force integrated control optimization method of an electric vehicle driven by a hub. The invention brings the relationship between vehicle resultant force and four-wheel tire force into the vehicle body six-degree-of-freedom equation to obtain the expected values of vehicle kinematics control target longitudinal speed, lateral speed, vertical speed, pitch angle, roll angle and yaw angle, thereby optimizing the vehicle kinematics control target. The layered longitudinal, lateral and vertical force unified optimal distribution integrated control method eliminates the conflict between different chassis electronic control systems and enhances the complementarity, and comprehensively improves vehicle handling stability and vehicle driving posture, which is embodied in the improvement of vehicle road tracking performance, safety, maneuverability, stability and comfort.

The invention relates to a maneuverability improving and controlling method based on a distributively driven electric vehicle. The method includes steps: acquisition of an ideal differential power-assisted steering curve, namely acquiring the differential power-assisted steering curve according to a longitudinal vehicle speed and a steering wheel torque; calculation of a reference yaw velocity, namely calculating an ideal yaw velocity target value according to a steering wheel turn angle and vehicular running parameters, and taking the calculated ideal yaw velocity target value as the reference yaw velocity; calculation of an additional yaw torque, namely tracking the calculated reference yaw velocity in real time, calculating the additional yaw torque through feedforward control and feedback control; longitudinal force distribution, namely distributing driving torques of front-axle left and right wheels and rear-axle left and right wheels according to the ideal differential power-assisted steering curve and the additional yaw torque. Compared with the prior art, the method has the advantages that overall yaw velocity response is improved while operating burden is relieved for a driver, and accordingly maneuverability of the whole vehicle is effectively improved.

The invention discloses a four-wheeled independently-driven electric automobile stability control method and system. The technical problem that an ARS safety system and a DYC safety system of an electric automobile in the prior art work simultaneously and accordingly coupling and whole-automobile performance reduction are caused is solved. The four-wheeled independently-driven electric automobile stability control method comprises the steps of obtaining a turn angle of a steering wheel and the speed of an automobile when the automobile turns; obtaining the variable-transmission ratio of the steering wheel to the turn angles of rear wheels based on an automobile speed and automobile speed transmission ratio mathematical model; obtaining the turn angle of front wheels based on the turn angle of the steering wheel; obtaining an ideal state of the automobile based on an ideal variable-transmission ratio model of the automobile, the speed of the automobile and the turn angles of the front wheels; obtaining an actual state of the automobile based on an electric automobile non-linear eight-degree of freedom model, the speed of the automobile and the turn angles of the front wheels; obtaining errors of the actual state of the automobile compared with the ideal state of the automobile; controlling, eliminating or decreasing the errors of the state of the automobile through the ARS and DYC safety systems or the ARS safety system respectively in a nonlinear area or a linear area where the automobile works so as to achieve stable operation of the automobile.

The invention discloses high-entropy ceramic powder used for a thermal barrier coating. The ceramic powder is characterized by having a pyrochlore structure and a chemical formula of RE2Zr2O7, wherein RE is any 3-7 different metal elements selected from rare earth elements including Y, La, Pr, Nd, Sm, Eu and Gd, and the percentage of one mole number of each RE element to the total mole number of all RE elements is 5%-35%. The preparation method comprises the following steps: mixing RE2O3 powder and ZrO2 powder, and heating the mixed powder under the heating condition of 1000-1700 DEG C for 1-10 h in an air atmosphere to obtain the high-entropy ceramic powder. According to the method provided by the invention, the high-entropy ceramic powder prepared by the method enriches a system of a thermal barrier coating material, has the advantages of low costs, simple and easy operation, a wide application range and the like, and is expected to be used in the field of thermal barrier coatings.

The invention provides an optical micro-hand based on a three-core fiber and a method for preparing the same. The fiber comprises a three-core fiber and a single-core fiber which is in coupled connection with the rear of the three-core fiber and the connection between the three-core fiber and the single-core fiber is realized by applying heating, fusing and tapering the welding point after welding. The other end of the three-core fiber is made into a cone by sintering at the sharp end after grinding or heating the ends of the fiber and applying fusing and tapering. Aiming at the defect and deficiency in the prior art, the optical micro-hand discloses an optical micro-hand based on a three-core fiber which can form a cross combination light field by grinding or tapering the ends of the fiber based on the three-core fiber by making use of the joint action among external refraction, internal reflection and external refraction as well as a cone gradual wave guide and further form a three dimensional gradient force potential trough at the convergence point of combination light fields so as to realize three dimensional trapping of tiny particles.