217results about How to "Reduce crash" patented technology

The invention discloses a four-rotor aircraft fault-tolerant control method and belongs to the field of aerocraft control. According to the method, first, based on a mathematical model of an aircraft, an attitude model under the condition of system faults of the aircraft is established; then, according to the attitude model, an adaptive law of fault estimation of an aircraft system is brought out, and a transfer function of loss of actuator effectiveness of the aircraft is also established; an adaptive law of fault estimation of loss of actuator effectiveness is put forward based on the loss of actuator effectiveness; and at last, based on the fault estimation of the system and the fault estimation of loss of actuator effectiveness, a fault-tolerant controller of an aircraft attitude system is designed. Thus, fault-tolerant control of four-rotor aircrafts is realized. By means of the method, probability of air crashes of four-rotor aircrafts is remarkably reduced, and flying reliability and safety of aircrafts are improved.

The invention discloses a quick and safe landing device and method for an unmanned aerial vehicle, belonging to the unmanned plane field. The quick and safe landing device for an unmanned aerial vehicle is provided with a trigger device which can trigger the unmanned aerial vehicle to execute the safe and quick landing mode; the unmanned aerial vehicle comprises a memory, a flight control device and a rotor; the memory is used for storing the preset safe and quick landing speed; the flight control device can control landing of the unmanned aerial vehicle according to the preset safe and quick landing speed; the rotor can be used for adjusting the rotation speed under the control of the flight control device; and the flight control device is connected with the memory and the rotor. The quick and safe landing device and method for an unmanned aerial vehicle can realize safe and quick landing of the unmanned aerial vehicle, and not only can reduce the air crash risk caused by too fast landing speed of the unmanned aerial vehicle, but also can prevent accidents caused by waiting for a too long time because of too slow landing speed of the unmanned aerial vehicle and the insufficient electric quantity.

The invention provides an intelligent course control method for an unmanned plane. The method comprises the steps that power-on self-test is conducted on the unmanned plane, the course and the GPS coordinates of a takeoff point in a northeast coordinate system are recorded, and the unmanned plane takes off in a common remote control mode; an initial course locking mode or a return flight point locking mode is selected; if the initial course locking mode is selected, the course of the unmanned plane at the takeoff point is used as the initial course, and intelligent course control is achieved under a rectangular coordinate system with the takeoff point as the original point; if the return flight point locking mode is selected, intelligent course control is achieved under polar coordinates with the takeoff point as the polar point. According to the intelligent course control method for the unmanned plane, crashes of the unmanned plane or contact lost accidents caused by misoperation conducted due to the fact that control staff can not judge the current course when being unskilled in operation or the flight distance is too long can be effectively reduced, operation of the unmanned plane can be greatly simplified, and the flight safety of the unmanned plane is improved.

The invention discloses a method and a system for automatically following a car by means of a mobile terminal. The method for automatically following the car by means of the mobile terminal includes: the mobile terminal is connected with a car control terminal; the mobile terminal opens a high-definition camera to monitor the road; the mobile terminal acquires a current road information, a car information and a current section information; the mobile terminal analyzes the acquired informations; the mobile terminal sends a control command to the car control terminal according to the analysis result or sends out a voice prompt command according to the analysis result. The method and the system for automatically following the car and assisting parking by means of the mobile terminal are capable of automatically following the car and assisting parking.

A gear mechanism having extremely less backlash, capable of suppressing the rattling noise of gears, having a large loading resistance in the thrust direction, and capable of transmitting high torque by using the gears transmitting a force by the meshing of the gears with each other in place of the transmission of the force by friction. The gear mechanism is formed by disposing the plurality of spur gears in the meshed state with each other. The screw-like gears (2) and (4) are disposed on the same axis as the spur gears (1) and (3) in the meshed state with each other. The screw-like gears (2) and (4) adjacent to each other are formed in screw shapes having lead angles extending in the reverse directions to each other and equal in angle to each other. The spur gear (1) and the screw-like gear (2) are rotated integrally with each other to transmit its rotation to the spur gear (3) and the screw-like gear (4) adjacent to each other.

The invention discloses a cutting machine for foamed concrete blocks, which comprises a rectangular frame and a cutting device. Four guide columns are vertically arranged at four corners of the rectangular frame. The cutting machine is characterized in that the cutting device comprises a transverse cutting mechanism and a vertical cutting mechanism. Compared with the prior art, the cutting machine has the advantages that the transverse cutting mechanism and the vertical cutting mechanism are separately arranged, so that cross interference can be well avoided. Further, since the transverse cutting mechanism and the vertical cutting mechanism are both obtained by basically identical structures, the integral structure is relatively simple, implementation is convenient, and implementation cost is low. Transverse cutting and longitudinal cutting are operated separately, a travelling mechanism drives a cutting wire to reciprocate for extruding cutting during reciprocated friction, and accordingly cutting resistance is greatly reduced while energy loss is reduced. More importantly, smoothness in cutting is improved, concrete blank disintegration is avoided, cutting success rate is greatly increased, and product scrappage is decreased.

Provided is a cable drag chain wherein braking can be applied to frame pivoting, and that furthermore has excellent producibility. The cable drag chain is constructed such that multiple frames (F) are formed coupled to be mutually pivotable, and a long body, such as a cable, is arranged in a guide part enclosed by each frame. The cable drag chain has a construction wherein, between the coupled frames (F1, F2), the pivot angle of the frame (F2) is restricted by contact between a stopper piece 31 (stopper receiver 42) of the one frame (F1) and a stopper receiver (41) (stopper piece 32) of the other frame (F2). The cable drag chain also has a construction wherein elastic projections (51, 52) of the one frame (F2) contact a receiver part (61) of the other frame (F1) when the coupled frames (F) are pivoted, and braking is applied to the relative rotation of the two frames (F1, F2) by the elasticity of the elastic projections (51, 52).

An ink cartridge (500) mounted on a carriage reciprocating together with a coating head and supplying an ink in an atmosphere side storage part (270) and a supply side storage part (290) to the coating head. The atmosphere side storage part (270) and the first and second ink storage parts (292) and (294) are formed of the liquid storage recessed part (122) of a cartridge body (120) opened on one surface side opposed to the coating head in the reciprocating direction and a film (140) sealing the opened face of the liquid storage recessed part (122). Agitating mobile bodies (711) are stored in the atmosphere side storage part (270) and the second ink storage part (294) in a movable state.

The utility model discloses a brake control device for elevator, which doesn't produce any action lagging when rescinding the brake, and doesn't need gradually increase the control of the winding current when braking, so the invention can reduce the collision sound of the brake. In the brake control device for elevator, when the brake is rescinded, the winding current is controlled by any one current in stepped currents of one to three steps; when the brake is being applied, the winding current is controlled by the stepped current of one to two steps.

A twin-clutch transmission that can always effectively reduce gear shift shock and a collision sound even under the existence of variation attributed to component tolerance and change over the ages attributed to wear. A twin-clutch transmission calculates a rotational speed difference (|Na−Nb|) between an odd-stage main shaft rotational speed (Na) and an even-stage main shaft rotational speed (Nb) and learns synchronization start gear shift drive displacement (θs) detected by a gear shift drive displacement detecting unit at the timing at which the rotational speed difference (|Na−Nb|) reaches a predetermined synchronization start determination rotational speed difference (Ds) from gear shift start. The twin-clutch transmission controls an actuator on the basis of the learned synchronization start gear shift drive displacement (θs).

The embodiment of the invention provides a memory parameter adjusting method and a mobile terminal. The method includes the following steps that a current terminal memory parameter and current terminal temperature are detected; a target memory parameter corresponding to the current terminal temperature is searched for in a preset memory parameter table; when the current terminal memory parameter is inconsistent with the target memory parameter, the current terminal memory parameter is adjusted to be the target memory parameter. The memory parameter of the mobile terminal can be automatically adjusted, the probability of a dead halt or restarting of the mobile terminal is reduced, and the stability of the mobile terminal is improved.

A rotation transmitting apparatus according to the present invention includes a first sun gear, a second sun gear, first planetary gears and second planetary gears. A carrier for supporting the respective planetary gears is integrally provided with a rotor of a speed change motor for changing a speed of rotation to be transmitted, so that the number of mesh portions in the gears is reduced. Further, the rotor is formed of a cylindrical shape and an input shaft for rotating the first sun gear is inserted into the rotor, so that a limited space is effectively used.

The invention discloses a hoisting and conveying fixture for assembly of a cabinet body of a centrally installed switchgear. The hoisting and conveying fixture comprises an assembly base, wherein a horizontal clamping mechanism and a vertical clamping mechanism are sequentially arranged on the assembly base; the assembly base comprises a bottom plate; supporting plates are sequentially arranged on two ends of the bottom plate; two ends of each supporting plate are provided with first hinge plates; a baffle plate is fixedly arranged on the middle part of each supporting plate; second hinge plates are symmetrically arranged on two sides of each baffle plate; and positioning holes are sequentially formed in two ends of the surface of the bottom plate. According to the hoisting and conveying fixture, through the arrangement of the horizontal clamping mechanism and the vertical clamping mechanism, the centrally installed switchgear is fully clamped from the horizontal direction and the vertical direction; reliability and stability during a clamping process are fully ensured; the centrally installed switchgear can be effectively hoisted and conveyed; the phenomenon of damage due to falling is reduced; the whole construction process is accelerated; and the hoisting and conveying fixture has good market prospect and promotion value.

The invention discloses a BCI-based aircraft control system including an EEG acquisition device, a portable EEG signal processing controller and a four-rotor aircraft. The EEG acquisition device includes an open-source brain wave device and a serial communication module. When a user issues a command, the EEG signal is transmitted to the portable EEG signal processing controller. The portable EEG signal processing controller includes a Linux embedded processor and a wireless communication module, when the Linux embedded processor receives the EEG signal and identifies the corresponding instruction, the instruction is sent to the four-rotor aircraft via the wireless transmission module. The four-rotor aircraft is equipped with a flight controller and attitude sensors, and the flight controller receives the corresponding construction through the wireless port and controls the aircraft to generate the specified action and the corrections is carried out according to the feedback attitude of the attitude sensors. The system is suitable for aerial photography, rescue, entertainment and other application scenes, and is helpful for simplify the flight control of the four-rotor aircraft and reduce the accidental crash.

The present invention discloses an unmanned aerial vehicle-based high-speed train overhead line system automatic patrol inspection method. The method of the present invention is characterized in that by using an electromagnetic field sensor installed on an unmanned aerial vehicle to detect the alternating electromagnetic field intensity around an overhead line system, the relative position of the unmanned aerial vehicle and the overhead line system is determined, whether a high-speed train exists nearby is determined, and further, the flight route and the attitude of the unmanned aerial vehicle are adjusted; when the nearby high-speed train is detected, the unmanned aerial vehicle rises and suspends. According to the application, the problem that the conventional technology can not satisfy the high-speed train overhead line system automatic patrol inspection demand is solved, the unmanned aerial vehicle navigates automatically when carrying out the patrol inspection on the overhead line system, the influence of the strong electromagnetic interference and the airflow on the unmanned aerial vehicle are reduced, and the air crash accidents are reduced.

The invention discloses an acting force regulating mechanism of a furniture upturning device. The acting force regulating mechanism comprises a fixed element, a connecting arm assembly and a fixed seat, wherein the fixed seat is overturned and opened/closed on the fixed element through the connecting arm assembly; the fixed element is provided with a first spring and second spring; one end of the first spring and one end of the second spring are respectively connected with the fixed element, and the other end of the first spring and the other end of the second spring are respectively connected with the connecting arm assembly; the fixed element is also provided with a regulating assembly for regulating an acting force of the second spring, and the regulating assembly at least comprises a fixed frame, a sliding element, a pushing element and a regulating screw; and a regulating action part of the regulating screw is acted through a tool or manually, the regulating screw is located and rotates relative to the fixed frame, drives the sliding element and the pushing element to displace on the fixed frame and releases or compresses the second spring so as to regulate the acting force of the second spring. The acting force regulating mechanism has the characteristics of simple and reasonable structure, safety and reliability, simplicity in production and realization, high regulation speed, convenience in operation as well as labor saving, smoothness, little collision, low noise and the like during starting/stopping.

The invention discloses a heat treatment process of a carbide alloy for cold heading dies, which comprises the following steps: (1) putting the sintered carbide alloy for cold heading dies into a heating chamber of a double-chamber vacuum furnace, and vacuumizing the heating chamber until the pressure of the heating chamber is (2*10-1)-(4*10-1) Pa; (2) heating the heating chamber in two stages, in the first phase, heating the heating chamber to 900 DEG C at a speed of 5-8 DEG C/min, and then carrying out heat preservation for 30-45 minutes, and in the second stage, heating the heating chamber to 1100-1300 DEG C at a speed of 8-10 DEG C/min. and then carrying out heat preservation 30-40 minutes; (3) filling high-purity nitrogen gas as shielding gas in the furnace, under the condition that the vacuum degree is 0.5-0.8 bar, completely soaking a heated product into a cold-chamber oil-quenching bath for 4-6 minutes, then ascending and separating the obtained product, and cooling the obtained product to below 60 DEG C; and (4) putting the obtained product into a vacuum tempering furnace to carry out tempering treatment for 5-6 hours at a tempering temperature of 450-600 DEG C, carrying out furnace cooling on the obtained product until the obtained product is at room temperature, and taking out the obtained product. According to the invention, the content of a face-centred cubic structure alpha-Co in the alloy is increased, the toughness and the strength are improved, the comprehensive mechanical properties are good, phenomena such as fatigue cracking, breakage and early wear in the process of application are reduced, and the purposes of prolonging the service life, reducing the application cost and increasing the application efficiency are achieved.

The invention relates to the technical field of agriculture, in particular to an unmanned aerial vehicle pesticide spraying device, and aims to overcome the disadvantages that liquid pesticide in a pesticide kit is not full, and an unmanned aerial vehicle is easy to crash because of inertia dithering, and the disassembling and assembling of the pesticide kit in the unmanned aerial vehicle are complicated. The unmanned aerial vehicle pesticide spraying device comprises an unmanned aerial vehicle body, wherein an accumulator is fixed to the bottom of the unmanned aerial vehicle body through bolts; wiring frames are welded to the periphery of the unmanned aerial vehicle body; and a dual-shaft motor is fixedly mounted at the tail ends of the wiring frames through bolts. According to the unmanned aerial vehicle pesticide spraying device disclosed by the invention, the output end at the bottom of the dual-shaft motor is used as a power source of a peristaltic pump, the liquid pesticide in the pesticide kit is extracted by the peristaltic pump, and the sprinkling effect is realized through a spray nozzle; a buffer spring mounted in each compression fixing frame is used for pushing a corresponding rubber ball at the tail end of a corresponding supporting rod to slide in a corresponding clamping groove formed in the surface of the pesticide kit, so that the functions of buffering and clamping on the medical kit are realized, the situation of crashing caused by inertia dithering of the liquid pesticide in the medical kit is reduced, the disassembling and assembling of the medical kitare very convenient, and the working performance is improved.