3results about How to "Flexible design approach" patented technology

The invention belongs to the technical field of aero-engine nozzle design, and particularly relates to an aero-engine nozzle design method which comprises the following steps: step 1, determining geometric data of sections of an inlet and an outlet of a nozzle; 2, calculating curvature distribution and total length of sections of an inlet and an outlet of the spray pipe; 3, determining the initial shapes of other sections outside an inlet and an outlet of the spray pipe; 4, determining the final shapes of other sections of the spray pipe; 5, determining the center line geometry of the spray pipe; 6, the positions of an inlet, an outlet and other sections of the spray pipe on the center line are determined; 7, determining geometric coordinates of upper and lower longitudinal lines of the spray pipe; 8, determining a common tangent equation of upper and lower longitudinal lines of the spray pipe; ninthly, determining the geometry of an equal-straight extension section of the outlet of the spray pipe; 10, judging whether the spray pipe meets an omnidirectional shielding condition or not; 11, if the spray pipe does not meet the omni-directional shielding condition, the center line adjusting parameters of the spray pipe are determined; and twelfthly, iterative design is conducted on the spray pipe till the spray pipe meets the omni-directional shielding condition.

The utility model discloses a low scattering and pneumatic integrated telescopic hexagonal groove countersunk head screw, it includes screw cap, countersunk head round platform thread and stem. Screw cap includes six prismatic marbles spring and six prismatic inner groove, when not considering the tolerance gap between six prismatic marbles and six prismatic inner groove, the stem is the cylinder that is connected with the bottom surface of screw cap, and the thread is the ordinary thread that is equidistantly surrounded in the stem, that is, the triangular tooth shape. The low scattering pneumatic telescopic hexagonal groove countersunk head screw provided by the utility model provides the design principle of low scattering pneumatic screw radar stealth and pneumatic shape, which is a design method for the comprehensive mechanical properties of the low detectability of the screw pneumatic, and the design idea is unique and ingenious, the pneumatic low detectability effect is remarkable, the mechanical properties are good, and the design part has high universality. It can be operated and used by using the general hexagonal screwdriver, and it is convenient to couple all the screws with the whole in the gap direction.

The invention discloses an anti-hemolysis hydrogel coating as well as a preparation method and application thereof, a micron-sized porous structure and a hydrophilic silane bonding layer are constructed on the surfaces of various base materials, and the adhesive force of the hydrogel coating and the base materials is remarkably enhanced through a physical topology winding and covalent bond connection method. Through the methods of spraying, dipping, coating, mold forming and the like, the device can be suitable for blood contact medical instruments with different shapes and materials; by adjusting the formula and preparation process parameters of the hydrogel, the special requirements of different medical instruments can be met, and the hydrogel has wide applicability and good expandability. Through optimized materials and design, the anti-hemolysis hydrogel coating disclosed by the invention has remarkable technical advantages in the aspects of reducing hemolysis risk, improving biocompatibility, simplifying the structure of medical equipment and the like.