Cold-drawn pearlitic steel wires

Formation mechanisms of white layers induced by hard turning of AISI 52100 steel

The effect of nanostructured surface layer on the fatigue behaviors of a carbon steel

Deformation mechanisms in an austenitic single-phase duplex microstructured steel with nanotwinned grains

Architectured surface layer with a gradient nanotwinned structure in a Fe-Mn austenitic steel

Strain-induced refinement in a steel with spheroidal cementite subjected to surface mechanical attrition treatment

The invention discloses a folding undercarriage of a balloon-borne near space solar powered unmanned air vehicle and a folding structure of the folding undercarriage. The folding undercarriage comprises a top and bottom connection sleeve, a sliding sleeve, a supporting rod, a connection spring, a wheel connection sleeve, a wheel mounting support, a wheel and other components. Before balloon-bornelaunching, the undercarriage can be folded into a vehicle body by adjusting the position of the sliding sleeve, and then the wheel is fixed to the interior of the vehicle body through a high-strengthconnection rope. When the unmanned air vehicle lands, the high-strength connection rope is cut off by a cutter, and the undercarriage is rotated to be vertical under the action of gravity of the undercarriage. Afterwards, the sliding sleeve slides to a specific position under the action of the connection spring and the gravity of the sliding sleeve, at the moment, the undercarriage is locked up, and landing can be achieved. By means of the folding undercarriage, the problem of increase of resistance caused by a fixed undercarriage of the solar powered unmanned air vehicle is solved, and meanwhile compared with a traditional retractable undercarriage, the folding undercarriage has the advantages of being simple in structure, low in manufacturing cost, low in weight, convenient to use and maintain and the like.

Folding undercarriage of balloon-borne near space solar powered unmanned air vehicle and folding structure of folding undercarriage

The utility model provides a parachute landing emergency recovery system for an unmanned aerial vehicle. The parachute landing emergency recovery system comprises a guide parachute, guide parachute rolling cloth, a guide parachute connecting belt, a main parachute, a main parachute connecting belt, a separation connector, a parachute bay and a parachute bay cover. The guide parachute is fixed on the parachute cabin cover through the guide parachute rolling cloth; the main parachute is arranged in the parachute bay; the side wall of the first end of the main umbrella is connected with the guide umbrella through a guide umbrella connecting band; the second end of the main parachute is connected with an interface on the unmanned aerial vehicle through a main parachute connecting belt; the separation joint is arranged in the middle of the main umbrella connecting band. The parachute recovery device solves the parachute emergency recovery problem of the unmanned aerial vehicle, and is convenient to package, simple to maintain, convenient to observe, disassemble and replace, fast in local damage repair and good in interchangeability among all parts.

Parachute landing emergency recovery system for unmanned aerial vehicle

The utility model discloses a ball carries foldable undercarriage of light and the beta structure who closes on space solar energy UAV, include spare parts such as top and bottom connecting sleeve, smooth movable sleeve, bracing piece, coupling spring, wheel connecting sleeve, wheel installing support, wheel. The ball carry go up to the air before, position through adjusting smooth movable sleevecan be folding to the fuselage in with the undercarriage, then connect the rope through excelling in and fix the wheel inside the fuselage. To excelling in with the cutterbar when landing, it restricts to connect cuts off, and messenger's undercarriage gos to vertical direction to at the effect underspin of self gravity. Afterwards under the effect of coupling spring and self gravity, the smooth movable sleeve specific position that can slide, the undercarriage was locked and was died this moment, can land. The utility model provides a problem that increases of the resistance that leads to ofsolar energy UAV fixed landing gear, have simple structure, low in manufacturing cost, light in weight, use for traditional retractable undercarriage again simultaneously and maintain advantages suchas convenient.

Zhou Liyang

Papers

Strain-induced refinement in a steel with spheroidal cementite subjected to surface mechanical attrition treatment

Folding undercarriage of balloon-borne near space solar powered unmanned air vehicle and folding structure of folding undercarriage

Parachute landing emergency recovery system for unmanned aerial vehicle

Ball carries foldable undercarriage that closes on space solar energy UAV and beta structure thereof