70results about How to "Good static stability" patented technology

A pickup bed support structure that includes longitudinally extending frame rails to which transversely extending beams used to support the truck bed box are assembled. The beams are received below a top surface of the frame rails by forming notches or holes in the frame rails into which the beams are inserted. Alternatively, notches or holes may be provided in the transversely extending beams that receive the longitudinal extending frame rails. One method of manufacturing a pickup truck bed support structure is disclosed in which holes are provided in the longitudinally extending frame rail that receive the transversely extending beam that support the pickup truck bed. An alternative method is also disclosed in which notches are formed in the frame rails that receive the beams that are welded to the frame rails prior to assembling the pickup truck bed to the beams.

A projectile comprises an imaging seeker at a front of the projectile; a front warhead behind the imaging seeker; a power supply; an electronics unit connected to the power supply and comprising a microprocessor circuit board, a voltage regulator circuit board, an inertial measurement circuit board and a fuze and safe and arm circuit board, all electrically connected to each other, the microprocessor circuit board also being connected to the imaging seeker; a rear warhead, the front and rear warheads being electrically connected to the safe and arm circuit board; a rocket motor electrically connected to the electronics unit; foldable fins mounted at the rear of the projectile; a shell that encases the front warhead, the power supply, the electronics unit, the rear warhead and the rocket motor; and a maneuver mechanism disposed in the shell and electrically connected to the microprocessor circuit board.

The invention provides an airplane with a combined-wing layout of a flying wing and forward-swept wings. The airplane is characterized in that thin-wing type vertical columns A and B are additionally arranged at the 70% wingspan positions of the outer sides of two side wings of a flying-wing airplane with backward-swept wings, a thin-wing type vertical column C is additionally arranged at the tail part of the flying-wing airplane, and horizontal forward-swept wings are additionally arranged at the top ends of the three thin-wing type vertical columns A, B and C so as to form the combined-wing layout of the flying wing and the forward-swept wings; elevators are arranged on the horizontal forward-swept wings and a rudder is arranged on the vertical column C; a duct type air inlet channel is adopted on the upper wing surface of the flying wing, and cracking type drag rudders are distributed at the thin-wing type vertical columns A and B. The airplane provided by the invention has the advantages that under the condition that the structure strength is effectively guaranteed, the effective aspect ratio of the wings is increased, the induced drag is reduced, the lift-drag characteristics of the airplane are improved, the stealth performance of the airplane is improved, direct-force control of the airplane in the vertical direction is realized and the detecting accuracy under the maneuvering condition is improved.

A process for preparing the alpha-olefine as the drag reduce used for delivering oil in pipeline includes such steps as loading monomers into reactor, adding catalyst while stirring in the condition of isolating air, adding the oil-soluble polyester, polyether or ester-ether copolymer solution to which the alpha-olefine polymer is not dissolved, and reacting at -50-20 deg.C for 3-10 days. Its advantages are simple process, and high molecular weight, high effect, high stability and low viscosity of product.

The invention discloses a carbon fiber water-soluble epoxy resin sizing agent and a preparation method thereof. The sizing agent comprises main slurry and deionized water as main components, wherein the mass ratio of the main slurry to the deionized water is (50-80):(20-50); and the main slurry consists of modified phenol-formaldehyde epoxy resin and allyl polyoxylethylene ether (AEPH), and the mass ratio of the modified phenol-formaldehyde epoxy resin to AEPH is (60-90):(10-40). The preparation method of the sizing agent comprises the following steps: firstly reacting phenol-formaldehyde epoxy resin with diethanolamine to obtain water-soluble phenol-formaldehyde epoxy resin; and then mixing the water-soluble resin with AEPH in proportion, and performing dilution to reach a certain concentration by using the deionized water to obtain the sizing agent. The sizing agent disclosed by the invention is good in stability and low in cost, cannot cause environmental pollution, and is simple in preparation method; good post-processing performance of carbon fibers can be provided by adding flexible molecular AEPH; experiments show that after the carbon fibers are coated with a proper amount of the sizing agent, the post-processing performance can be significantly improved; and the performance of a carbon fiber epoxy resin composite material can be improved.

The invention provides a collagen fiber stuffing product which comprises 50%-100% collagen fiber in the stuffing and its Process for preparing. The said stuffing is oakum stuffing mixed collagen fiber deliberating from animal hide with at least another textile fiber; or materials stuffing arise from teasing, bedding web and modeling. The stuffing product in the invention is provided with advantages of well puffy, well rebound, well warming, flameproof and sound absorbing which the current stuffing can not get because it uses collagen fiber as main stuffing. The stuffing produced in the process provided in the invention has no peculiar smell, without putrefaction, without mouldy, and can be used in practice. The product is low cost and settles the problem of leftover bits and pieces of industrial material, so it is environment friendly.

An intake manifold 10 in the air intake tract of an internal combustion engine which has a main flow cross section 14 between an oncoming flow side 12 and an outgoing flow side 13. At least one resonator chamber 23 is arranged on the circumference of the main flow cross section 14 in communication with the main flow cross section 14. The resonator chamber 23 is surrounded by side walls 30 and closed by a cover 28, with the side walls 30 of the resonator chamber 23 and the wall 15 forming the main flow cross section 14 being manufactured together in one piece. A parting plane 31 situated between the cover 28 and the side walls 30 of the resonator chamber 23 is arranged outside of the wall 15 forming the main flow cross section 14.

The present invention relates to an alpha-olefin drag-reducing polymer suspending liquid for oil pipeline and its preparation method. Alpha-olefin polymer small block and oil-soluble suspension base liquor in which the alpha-olefin polymer is not dissolved are mixed according to the weight ratio of 1:1-1:4, then fed into colloid mill and ground to obtain the processing fineness of 2-50 microns. Said invention drag-reducing polymer suspending liquid has high concentration, low viscosity and good standing stability, also can be used in finished product oil pipeline.

The invention belongs to the technical field of the control of a two-axis excitation generator and particularly relates to an excitation control method for a two-axis excitation turbogenerator. The method comprises the steps that: two sets of excitation windings on d and q axes of a rotor are set, the excitation windings are uniformly distributed on the surface of the rotor and are symmetrical, winding axes are perpendicular to each other, direct current is introduced to the two sets of excitation windings to generate two excitation fundamental wave magnetomotive forces, the position of an airgap synthetic magnetomotive force relative to the rotor is changed by adjusting the proportions of the two excitation fundamental wave magnetomotive forces while a combined excitation magnetomotive force is maintained to be unchanged, and therefore, the static stability limit of the two-axis excitation turbine generator is improved. The two-axis excitation turbine generator can operate at any rotation speed under the corresponding excitation control, the same-frequency asynchronous operation of the generator is realized, the anti-interference ability of the generator is effectively improved,and the power supply reliability of a key area is ensured.

An apparatus for transfer of the weight from the plow to the tractor to improve the traction of the tractor for which the rotational axis 11 is arranged in such a way that the transfer of the weight, at the same time, also effects a required torque for the turning process and an increase in the stability of the tractor during the turning process.

The invention discloses an adjustable stability improving device of a hypersonic aircraft. The device comprises first tail skirts, second tail skirts, a first shaft sleeve, a second shaft sleeve and acenter shaft, wherein the first tail skirts and the second tail skirts are formed by a plurality of partially overlapped scales in a surrounding mode, and the scales of the first tail skirts are movably connected with the tail end of the aircraft and surround the aircraft by a circle; the scales of all the first tail skirts are connected with the first shaft sleeve through a framework; the scalesof the second tail skirts are movably connected with the tail ends of the scales of the first tail skirts in the axial direction of the aircraft, and the scales of all the second tail skirts are connected with the second shaft sleeve through a framework; the center shaft is sequentially sleeved with the first shaft sleeve and the second shaft sleeve in the axial direction of the aircraft, and thetension angles of the first tail skirts and the second tail skirts are changed freely along the central axis, so that the flight stability of the hypersonic aircraft is adjusted.

The present invention provides a vertical wind power generator with motor startup mode, comprising a column and one or more vertical wind power generation units on the column. The generator is equipped with an excitation system and a damper system. The excitation system comprises an excitation controller, an exciter, a rotary rectifier, an electric network, and a two-way converter; the damper system comprises a damping winding, a two-way converter, and an electric network; wherein, the exciter is connected to the generator rotor, the excitation controller is connected to the stator winding of the exciter, the rotor winding of the exciter is connected to the generator rotor winding via the rotary rectifier, the excitation controller is connected to the electric network, the electric network is connected to the two-way converter, and the two-way converter is connected to the generator stator winding; the damping winding is mounted on the generator rotor. At low speeds, the generator can operate in electrodynamic mode, so that the difficulty in generator startup is settled. During normal operation, the generator can operate at variable speeds at constant frequency.

A static pressured air-float guide rail based on bilateral symmetric damping belongs to the technical field of the precision instrument and measurement. In view of the characteristics of small driving force and large inertia of the air-float guide rail, and according to the properties of step response and shock response of a closed loop control system of the guide rail, a two-way viscous damper is introduced to the system to constitute a part for rate feedback, so that the shortage of damping effect of a differential parameter in a PID controller is relieved, thus increasing the damping ratio of the system, reducing movement over-control, and eliminating proper vibrations caused by random disturbance. Two viscous dampers with the same parameter are symmetrically arranged at the two ends of an air-float cover to form a two-way viscous damper; the intensity of the damping force is proportional to the speed of the air-float cover; the direction of the damping force is aligned with the movement direction of the air-float cover; and the damping coefficient is accurate and adjustable, so that the movement over-control of the guide rail and the proper vibration in the movement direction after positioning are reduced, and the positioning precision and static stability of the guide rail are increased by about one order of magnitude.