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418results about How to "Increased safety margin" patented technology

Design method for approach landing track of unpowered aircraft

The invention discloses a design method for an approach landing track of an unpowered aircraft. When the flareout landing track is designed, assumed that the height of a flareout landing initial point is known, then, expressions of all track parameters are derived according to a geometrical relationship, and the flareout landing track is designed. In order to design the ideal flareout landing track, the proper height of the flareout landing initial point is found out through an optimization algorithm, track deduction is conducted along the landing track, and therefore the grounding dynamic pressure becomes the ideal grounding dynamic pressure. A deep glide landing track and the ideal flareout landing track form the optimal approach landing track. According to the design method, the aerodynamic force and the aerodynamic moment borne by the aircraft are taken into consideration, and the influences on the design of the landing track of aerodynamic data of deflecting of an aerodynamic control plane and putting of an undercarriage are also taken into consideration. The design method for the approach landing track is simple in principle, computer software is adopted for conducting optimization design, and the design efficiency is improved.
Owner:BEIHANG UNIV +1

Multi-angle bulletproof and puncture-proof no-weft cloth and manufacturing method thereof

InactiveCN103783704AIt has dual functions of bulletproof and stabproofIncrease elasticitySynthetic resin layered productsLaminationFiberVolumetric Mass Density
The invention provides multi-angle bulletproof and puncture-proof no-weft cloth, and relates to the field of individual protection. The multi-angle bulletproof and puncture-proof no-weft cloth is mainly formed by compositing a plurality of layers of unidirectional fiber preimpregnated materials through different angles, and every two layers of unidirectional fiber preimpregnated materials are bonded through tackiness agents or adhesive films. According to the no-weft cloth, each layer of the cloth comprises at least one layer of unidirectional fiber preimpregnated materials, wherein the surface density of the each layer of unidirectional fiber preimpregnated materials is 55 g / m<2>+ / -5 g / m<2> or 110 g / m<2>+ / -5 g / m<2>. The invention further provides a manufacturing method of the multi-angle bulletproof and puncture-proof no-weft cloth. Puncture-proof no-weft clothes produced by the multi-angle bulletproof and puncture-proof no-weft cloth is high in safety margin and light, safe reliability of fighting personnel can be obviously improved, meanwhile, fighting efficiency of the fighting personnel is improved, and loads of the fighting personnel are reduced.
Owner:BEIJING AEROSPACE RATE MECHANICAL & ELECTRICAL ENG CO LTD

Passive residual heat removal system for nuclear power plant

The invention relates to a passive residual heat removal system for a nuclear power plant. The passive residual heat removal system for the nuclear power plant comprises a steam generator shell heat exchanger, a heat exchange loop pipeline, a shell exterior heat exchanger, a pressure maintaining valve, an isolating valve and a heat transferring medium, wherein the heat exchange loop pipeline penetrates through a containment; the steam generator shell heat exchanger is distributed on a steam generator and is communicated with the heat exchange loop pipeline; the shell exterior heat exchanger is arranged outside the containment and is communicated with the heat exchange loop pipeline; the shell exterior heat exchanger is arranged at a high position relative to the position of the steam generator shell heat exchanger; the pressure maintaining valve and the isolating valve are arranged in the containment and are sequentially arranged between the steam generator shell heat exchanger and the shell exterior heat exchanger along a first flow direction of the heat transferring medium in the heat exchange loop pipeline; the passive residual heat removal system for the nuclear power plant is maintained in a relatively low pressure level by virtue of the pressure maintaining valve; and the isolating valve and a shutdown safety signal of a reactor are subjected to interlock opening to be used for continuously taking away heat in the steam generator during an accident.
Owner:STATE NUCLEAR HUAQING BEIJING NUCLEAR POWER TECH R & D CENT +1
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