36results about How to "Reduce aerodynamic force" patented technology

Aerodynamic forces contribute to disk and actuator vibration leading to track positioning errors in storage devices such as hard disk drives. The invention provides a variety of dampening mechanisms and a method of dampening to alleviate these problems in single disk storage devices. This includes disk drives of at most 13 millimeters in height.

A remote controlled hovering toy figure having a propulsion system, a control system, a winged body, and a wing actuation assembly. The winged body is mounted to the propulsion system, which is controlled by the control system. The wing actuation assembly is mounted to the winged body, and the wing actuation assembly is powered by the control system. The wing actuation assembly drives the wings in an oscillating flapping motion. The wings comprise apertures permitting air to pass through the wing, thus reducing the aerodynamic effect of the flapping motion. In this manner, the wings produce a softened “bouncing” flight action, thus creating a realistic flight motion. In another embodiment, the propulsion system comprises one or more rotors in a coaxial arrangement, and a rotor mast housing in the shape of a rider riding the hovering toy figure.

The invention relates to an outer wind shield for a vehicle. The outer wind shield is characterized in that a guide groove is arranged at the vehicle bottom position of the outer wind shield, thus guide space of air flow can be increased, and the influence on the outer wind shield due to air flow disturbance at the vehicle bottom can be improved; a protecting steel sleeve is added at the installation hole position of the outer wind shield, thus the stress concentration on rubber due to installation threads can be reduced, the stressed area of an installation hole can be increased, the stress distribution situation of the installation hole can be improved, and the anti-bending performance of the outer wind shield can be increased through the supporting of the protecting steel sleeve; and a certain inwards-inclined angle exists between a wing plate of the outer wing shield and a vehicle body direction, thus pressure difference at two sides of the outer wind shield can be reduced, the eversion aerodynamic force suffered by the outer wind shield can be reduced, the air flow environment of the whole outer wind shield can be improved, the inwards-inclined angle is not less than 2 degrees, and the force distribution of the air flow on the outer wind shield can be more facilitated. According to the outer wind shield disclosed by the invention, through the improvement, the defect that the outer wind shield is in eversion or avulsion when a train is in high-speed running can be overcome, the service life of the outer wind shield is prolonged, and the replacing and repairing cost can be reduced.

An axial-flow fan structure is disclosed, having a localized area expansion between the rotor (i.e. front rotating impeller) and stator blades (i.e. rear stationary or fixed blades, sometimes called de-swirl vanes). The area expansion is provided by utilizing an impeller having a (slightly) falling tip contour (FTC).

A high-speed train wake passive control method, the steps are as follows: through theoretical analysis or numerical simulation or wind tunnel experiment method to find out the area where flow separation occurs on the surface of the tail car; set array pits on the flow separation area of ​​the tail car to form Non-smooth surface: By establishing the CAD model of the high-speed train under the non-smooth surface parameters, the CFD method is used to simulate the flow field in the wake area of ​​the high-speed train, and finally determine the optimal non-smooth surface parameters of the above pits. The invention has the characteristics of improving the vortex structure at the tail of the train, slowing down the vortex motion of the wake, reducing the pressure difference resistance of the whole vehicle, improving the running stability of the train, etc., and has deep theoretical guiding significance and practical promotion value.

A turbomachine combustion chamber includes an inner annular wall, an outer annular wall surrounding the inner wall so as to co-operate therewith to define an annular space forming a combustion area, a plurality of fuel injector systems including pilot injectors alternating circumferentially with full-throttle injectors, and at least one air admission opening out into the upstream end of the combustion area in a substantially longitudinal direction. The outer wall has a plurality of pilot cavities extending between the two longitudinal ends of the outer wall and extending radially towards thereof, the pilot cavities being fed with air from outside the combustion chamber in a common substantially circumferential direction. Each pilot injector opens out radially into a pilot cavity, and each full-throttle injector opens out radially between two adjacent pilot cavities.

The invention provides a cylindrical traveling wave spoiler anti-dragging and damping device. The device comprises a driving part, a first end cover, a second end cover and a framework. One end of the framework is connected with the first end cover, the other end of the framework is connected with the second end cover, and the second end cover is connected with the driving part. The windward side of the framework is a smooth arc surface, the leeside of the framework is provided with a first groove and a second groove, and the first groove and the second groove are symmetric. A first traveling wave cylinder belt drive mechanism is arranged in the first groove, and a second traveling wave cylinder belt drive mechanism is arranged in the second groove. The cylindrical traveling wave spoiler anti-dragging and damping device has the advantages that by controlling the speed of the first traveling wave cylinder belt drive mechanism and the speed of the second traveling wave cylinder belt drive mechanism, a series of stable vortexes are formed at the position of wave troughs, a shear layer in traditional significance is eliminated, formation of wake flow vortexes can be delayed or blocked, aerodynamic force on the surface of the structure is greatly reduced, and then the wind-induced vibration effect of the structure is effectively restrained or reduced.