Patents
Literature
Patsnap Copilot is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
Patsnap Copilot

83 results about "Forward angle" patented technology

Power below-knee prosthesis-based gait recognition method

The invention relates to a power below-knee prosthesis-based gait recognition method. The method comprises the following steps that: 1) a sensor is arranged at a corresponding position of a power below-knee prosthesis; 2) when H is equal to 1, and simultaneously FH is greater than FPH and the derivative of theta ankle is less than 0, an ankle joint enters a passive plantar flexion stage; 3) when T is equal to 1, the passive plantar flexion stage is finished; the ankle joint enters a passive dorsiflexion stage, and simultaneously the ankle joint rotates forwards until the ankle joint reaches amaximal forward angle or H is equal to 0; 4) when H is equal to 0, Tankle is greater than tau pp, and the derivative of the theta ankle is less than 0, the ankle joint enters an active plantar flexion stage; 5) when theta toe is less than 0, a toe joint enters an active dorsiflexion stage; 6) when FT is greater than FPT, the toe joint enters the active plantar flexion stage and simultaneously thetoe joint starts to rotate downwards; and 7) when the ankle joint and the toe joint reach a specified angle or T is equal to 0, the active plantar flexion stage is finished, and a foot leaves the ground to enter a swinging stage; and in the swinging stage, the ankle joint and the toe joint recover to a balance state respectively. The invention provides a new gait recognition method in which a power ankle joint and a power toe joint are involved at the same time.
Owner:PEKING UNIV

Radar analog data merging method for navigation simulator simulation

The invention discloses a radar analog data merging method for navigation simulator simulation. The method comprises the following steps that nautical charts with different measuring scales are screened according to navigation purposes of the nautical charts and the distances between the nautical charts and reference points; radar analog data are cut; the cut nautical charts are ranked according to two principles; redundant data of an overlapping region of every two adjacent nautical charts are screened in sequence; a gap in a merged polygon is filled so as to form a rectangle, and a new mapsheet is constructed; edge matching is conducted on shorelines, from the nautical charts with the different measuring scales, in merged radar analog data. According to the method, due to the fact that the nautical charts involved during navigation are screened according to the reference points of navigational areas and the navigation purposes of the nautical charts, the quantity of the radar analog data is greatly reduced under the premise that the accuracy of the radar analog data is guaranteed. Due to the fact that characteristic rules of forward angles in the radar analog data are worked out, the shorelines and boundaries generated due to chart subdivision are distinguished accordingly, and influences, caused by chart subdivision making, on the accuracy of the radar analog data are eliminated.
Owner:DALIAN MARITIME UNIVERSITY

Method for measuring particle grain diameter

The invention relates to a method for measuring grain diameter by utilizing binocular vision matching and particle picture gray scale difference, pertaining to the technical field of optical grain diameter measurement. According to the characteristic that different forward angle scattered lights have light intensity differences and by utilizing a digital particle image velocimetry (DPIV) imaging system provided with dual-cameras, the method obtains two particle pictures with gray scale difference, the flow fields of which are formed by single exposure; after the particle pictures are pre-treated by an image processing technique, the mating of a same particle corresponding to two particle image points on the two particle pictures is realized according to a binocular vision matching principle; the grain diameter of the particle is obtained by substituting the gray scale value summation of the two particle image points into a grain diameter solving formula, thus obtaining the particle size information of the whole flow field; the method has the reduced requirement to the light intensity and the stability of laser and the particle mating method is simple and convenient, thus reducing the influence of system errors, the digital graphic processing technique and laser diffraction on the measurement result of the particle size, overcoming the deficiencies and defects in the prior art and having substantial characteristics and prominent advancement.
Owner:TONGJI UNIV

Smoke suction pipe connecting structure and smoke suction electrotome

The invention discloses a smoke suction pipe connecting structure and a smoke suction electrotome. The smoke suction pipe connecting structure comprises a smoke suction pipe, a locking ring slot, an elastic eccentric sleeve and a projection part, wherein the smoke suction pipe is inserted into a housing handle of the electrotome, the locking ring slot is arranged in the outer circumference of the smoke suction pipe, the elastic eccentric sleeve is arranged in the locking ring slot, and the projection part is arranged on the locking ring slot and matched with the elastic eccentric sleeve. When the smoke suction pipe in the housing handle of the electrotome forwardly rotates by a preset forward angle, the projection part and the elastic eccentric sleeve are matched, so that the smoke suction pipe is radially and axially locked with the housing handle of the electrotome; when the smoke suction pipe in the housing handle of the electrotome reversely rotates by a preset reverse angle, the projection part and the elastic eccentric sleeve are matched so as to unlock the radial and axial locking of the smoke suction pipe and the housing handle of the electrotome. The smoke suction pipe connecting structure and the smoke suction electrotome have the advantages of simple structure, convenience in operation and convenience in replacement and adjustment.
Owner:ZHEJIANG MEDSTAR TECH CO LTD

Novel large-lift-force vertical take-off and landing aircraft

InactiveCN105818980AReduce nose down momentBow moment balanceVertical landing/take-off aircraftsRotocraftJet aeroplaneLow speed
The invention discloses a novel large-lift-force vertical take-off and landing aircraft. The aircraft comprises an aircraft body and main wings arranged on the two sides of an aircraft tail of the aircraft body. Each main wing is jointly formed by an inside main wing body and an outside main wing body. Each inside main wing body is a sweep-forward wing, and a sweep-forward angle ranges from 10 degrees to 75 degrees. Two vertical tails are arranged above the aircraft tail of the aircraft body. Canards are arranged on the two sides of an aircraft head of the aircraft body. A rotor wing is arranged above the aircraft body. A power device is arranged between each inside main wing body and the corresponding outside main wing body. An undercarriage is arranged at the lower portion of the aircraft body. By the adoption of the novel large-lift-force vertical take-off and landing aircraft, the flight properties of vertical take-off and landing, the high speed, the long navigation time and the large voyage are considered, the characteristic of a large task load is achieved, and the lift-drag characteristic in the high-speed flight process and the propelling efficiency of a power system are higher than those of a helicopter and those of a tilt rotor, a flight envelope is wider; and meanwhile decoupling is controlled through lift force and horizontal thrust, so that the aircraft is in transition from a low-speed flight state to a high-speed cruising state stably.
Owner:刘行伟

Built-in inversion-stopping self-locking device of angle adjuster

InactiveCN101797900AOvercoming structural complexityOvercoming structural costsMovable seatsSelf lockingEngineering
The invention discloses a built-in inversion-stopping self-locking device of an angle adjuster, comprising a clinching spring (1), an internal spline shaft (2), a cuneatic arch (3), an internal toothed plate (4) and a tension spring (03). The invention adopts the following technical scheme: the clinching spring is arranged on the outer wall of a central axle of the internal toothed plate; the principle that the diameter of the clinching spring is expanded when the clinching spring is stressed opposite to the winding direction and the diameter is contracted when the clinching spring is stressed in the winding direction is adopted; when a convex plate of the internal spline shaft touches a horizontal arm of the clinching spring in the forward angle of the clinching spring, the clinching spring loosens the outer wall of the central axle, and when the cuneatic arch touches the horizontal arm of the clinching spring in the backward angle of the clinching spring, the clinching spring enclasps and locks the outer wall of the central axle, thus overcoming the defects of complex structure, high cost and extra occupation of the inside space in the prior art. The built-in inversion-stopping self-locking device ensures inversion-stopping self-locking of the angle adjuster to achieve the aims of simple and reliable structure, low cost and no extra occupation of the inside space.
Owner:NINGBO SHUANGLIN AUTO PARTS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products