CN209870756U

CN209870756U - Unmanned aerial vehicle shock attenuation gasbag and unmanned aerial vehicle gasbag damping device

Info

Publication number: CN209870756U
Application number: CN201920165506.6U
Authority: CN
Inventors: 刘军德; 孙文达; 徐朝阳; 姚东; 王剑
Original assignee: Hangzhou Muxing Technology Co Ltd
Current assignee: Hangzhou Muxing Technology Co Ltd
Priority date: 2019-01-30
Filing date: 2019-01-30
Publication date: 2019-12-31
Anticipated expiration: 2029-01-30

Abstract

The utility model discloses an unmanned aerial vehicle shock attenuation gasbag, the gasbag is the cylinder structure after aerifing, is equipped with disappointing hole on two circular sides, and the hole coats and is stamped removable disappointing film. The pressure value endured by the deflating film is between 200kPa and 300 kPa. Based on the air bag, the utility model also discloses an unmanned aerial vehicle air bag damping device, the volume of the inflating component is small, the inflating speed can be automatically adjusted, and the problem of insufficient air bag filling or over-filling caused by the fact that the inflating speed can not be adjusted by the traditional inflating component is avoided; the start and stop of the blower are automatically controlled by the photosensitive light sensor, and the control is simple and reliable.

Description

Unmanned aerial vehicle shock attenuation gasbag and unmanned aerial vehicle gasbag damping device

Technical Field

The utility model relates to an unmanned aerial vehicle field especially relates to an unmanned aerial vehicle shock attenuation gasbag and unmanned aerial vehicle gasbag damping device.

Background

Along with the development and application popularization of unmanned aerial vehicles, in the landing buffering mode of an unmanned aerial vehicle recovery system, the air bag type buffering device is increasingly favored by designers of unmanned aerial vehicles due to the characteristics of light weight, small volume collection by folding before inflation, easy realization of small deceleration overload and the like. At present, the traditional scheme of an air bag inflation component is a gas cylinder, an initiating explosive device or an inflation pump and the like, and the start and stop of the inflation component are controlled by a flight control computer according to a preset program.

The main defects are as follows: the traditional scheme has the advantages of simple circuit, easy realization and the like, but mainly has the following defects:

because unmanned aerial vehicle self available installation space is less and characteristics such as landing topography are complicated, it all has strict requirement to appearance, size, weight, easy operation, high reliability of buffering gasbag device, and its control method also needs intellectuality simultaneously. The gas cylinder is large in size, inconvenient to install and high in cost; the initiating explosive device is small in size but is easily limited by factors such as environmental conditions and the like, such as temperature, humidity and the like, and the reliability is not high; the inflator pump has larger volume and uncontrollable inflation speed, and is easy to be over-inflated or under-inflated; the start and stop of the inflatable part in the traditional scheme are controlled by a flight control computer according to a preset program, and the surrounding environment cannot be sensed so as to deal with complex landing terrain; the size of a traditional air release hole is not well controlled, the air bag is easily insufficient due to overlarge size, the buffering effect is affected, and the machine body is instantly bounced when the air cannot quickly release air due to the fact that the air bag is too small.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an unmanned aerial vehicle shock attenuation gasbag and unmanned aerial vehicle gasbag damping device to the not enough of prior art.

The utility model adopts the following technical scheme: the utility model provides an unmanned aerial vehicle shock attenuation gasbag, the gasbag is the cylinder structure after aerifing, is equipped with disappointing hole on two circular sides, and it has removable disappointing film to cover on the hole of disappointing. The pressure value endured by the deflating film is between 200kPa and 300 kPa.

An unmanned aerial vehicle airbag damping device comprises an airbag, wherein the airbag is located in an airbag cabin; an inflator for inflating the airbag; the sensor is used for sensing the opening condition of the cabin cover of the air bag cabin and the landing condition of the unmanned aerial vehicle; and a drive control box; the sensor and the air charging device are respectively connected with the driving control box.

Further, the inflation device is a blower.

Further, the sensor is a photosensitive sensor and is arranged on the inner side of the air bag cabin cover, and when the cabin cover is opened, the photosensitive sensor acquires an optical signal; when the unmanned aerial vehicle lands, the photosensitive sensor is shielded and does not receive the optical signal any more; the photosensitive sensor converts the collected optical signals into electric signals and sends the electric signals to the drive control box.

The beneficial effects of the utility model reside in that: the utility model discloses the gasbag is the cylinder structure, has better parcel to the organism during the gasbag buffering, and there is the hole that loses heart gasbag both sides, bonds on the hole that loses heart to have removable PE film that loses heart. The damping device based on the air bag has the advantages that the volume of an inflating part is small, the inflating speed can be automatically adjusted, and the problem of insufficient inflation or over inflation of the air bag caused by the fact that the inflating speed cannot be adjusted by a traditional inflating part is solved; the start and stop of the blower are automatically controlled by the photosensitive light sensor, and the control is simple and reliable.

Drawings

FIG. 1: simplified diagram of parachute landing and air bag system;

FIG. 2: acceleration change curves at the gravity center of the unmanned aerial vehicle during the drop test;

FIG. 3: the utility model discloses the schematic structure.

Detailed Description

As shown in fig. 1, the air bag damping process has the following stages: inflating the air bag → compressing by touching the ground (volume reduction, pressure rise in the air bag) → decelerating the drone → the air bag pressure reaches the deflation pressure value (vent hole is opened, pressure drop in the air bag) → landing of the drone.

If a certain time t exists in the landing process of the target drone, the speed v (t) of the target drone is 0, the pressure F (t) of the air bag on the target drone is less than G (the gravity of the target drone), the kinetic energy of the target drone is zero at the moment, the potential energy of the air bag is not enough to rebound the target drone, and meanwhile, if the maximum overload is less than the allowable overload of the target drone, the aim of air bag shock absorption is achieved.

Assuming that the drone vertically falls and the mass of gas in the capsule is ignored throughout the process, the equation of the velocity of the drone at stroke x is:

in the formula of U_iIs the initial speed (steady deceleration) of the drone, V_iIs the initial volume of the balloon, p₀Is atmospheric pressure, n is less than or equal to gamma, gamma is adiabatic index, p_iIs the initial pressure of the air bag, p is the pressure of the air bag in the buffering process,wherein V is the volume of the bladder during cushioning,

as shown in fig. 2, the change curve of the acceleration at the center of gravity of the unmanned aerial vehicle during the drop test is as follows:

wherein A is the air bag ground contact area.

According to theoretical calculation and drop test results, the air leakage film can bear the pressure (less than or equal to 200kPa) of the target drone in the vertical falling process and cannot bear the pressure (more than or equal to 300kPa) of the air bag during buffering, so that the air bag buffering instant air leakage film can be broken, air can be quickly leaked, and instant bouncing is avoided. Therefore, for those skilled in the art, it is only necessary to select the PE film with the tolerance pressure value between 200kPa and 300kPa on the market and cover the air release hole with the PE film, so as to achieve the technical effect of the present application.

The novel airbag damping device shown in fig. 3 is constructed by using the airbag, wherein 1 is a driving control box, 2 is a blower, 3 is an air supply pipeline, 4 is an airbag, 5 is an air release film, and 6 is a photosensitive sensor. The drive control box adopts the existing programmable brushless direct current motor driver, is provided with a digital signal input interface and can be externally connected with a photosensitive sensor, and the inflation power of the blower can be preset in the drive control box. The air-blower is usually installed on the unmanned aerial vehicle fuselage, and its core component is direct current brushless motor, and its rotational speed accessible drive control box is adjusted, injects gas to the gasbag through the air supply line. The photosensitive sensor is arranged on the inner side of the air bag cabin cover and receives an optical signal when the cabin cover is opened. After the unmanned aerial vehicle lands, photosensitive sensor is sheltered from by the gasbag, can't accept the light signal.

When the unmanned aerial vehicle reaches a stable descending state, the air bag hatch cover is opened to throw out the air bag, the photosensitive sensor arranged above the air bag hatch cover sends a signal to the driving control box due to natural light irradiation, the driving control box starts the air blower to rapidly inflate the air bag with large air volume, and after the air bag is full of air after a certain time, the driving control box controls the air blower to slowly inflate the air bag with small air volume so as to maintain constant air pressure (about 141 kPa) in the air bag. After unmanned aerial vehicle landed, photosensitive sensor was sheltered from, and the drive control box received photosensitive sensor's signal after control air-blower stop work, and simultaneously, the gasbag is when buffering, and the internal gas of utricule is compressed, absorbs impact energy, and pressure rise to about 355kPa, and the film that loses heart breaks, and gas is discharged through the hole that loses heart, in time releases absorptive energy.

In addition, the air leakage film can be adhered to the air leakage hole through the adhesive, and a person skilled in the art can select a proper adhesive to ensure that the adhesive force is at least greater than the pressure of the air bag during buffering, so that the air leakage film is prevented from breaking instead of being separated during buffering.

Claims

1. An unmanned aerial vehicle damping airbag is characterized in that the airbag is of a cylindrical structure after being inflated, two circular side surfaces are provided with air release holes, and replaceable air release films cover the air release holes;

the adopted air-release film is a PE film with a tolerance pressure value of 200 kPa-300 kPa.

2. An unmanned aerial vehicle airbag damping device, comprising the airbag of claim 1; an inflator for inflating the airbag; the sensor is used for sensing the opening condition of the cabin cover of the air bag cabin and the landing condition of the unmanned aerial vehicle; and a drive control box; the air bag is positioned in the air bag cabin; the sensor and the air charging device are respectively connected with the driving control box.

3. The device of claim 2, wherein the inflation device is a blower.

4. The apparatus of claim 2, wherein the sensor is a light sensitive sensor mounted inside the airbag module hatch.