CN105699013A - Aircraft gravity center position detecting device and method - Google Patents

Abstract

The invention discloses a device for measuring the position of the center of gravity of an aircraft, which includes a floating plate, a lifting platform and a weight measuring device. The floating plate is fixed on the top of the lifting platform and moves up and down with the lifting platform; at least one of the floating plates is used for The sliding mechanism used to support the measurement point on the surface of the aircraft, the mechanism still has a horizontal sliding degree of freedom when it is close to the measurement point. The weight measuring device is connected with the lifting platform, and is used for measuring the weight supported on the lifting platform. According to the number of measurement points of the above-mentioned device, several sets of devices are used together. When in use, the floating plate is close to the measurement point of the aircraft through the lifting platform, and then the gravity carried by the floating plate is measured by the weight measuring device. The invention can realize the task of weighing and measuring the center of gravity of the object relatively easily, solves the influence of sideslip extrusion and friction caused by the inability to ensure that multiple points are weighed at the same time during weighing, and greatly improves the weighing accuracy. Provides a solid foundation for precise trimming.

Description

Aircraft Center of Gravity Position Measuring Device and Method

technical background

The invention relates to the measurement of the position of the center of gravity of an object, in particular to a device and method for measuring the position of the center of gravity of an aircraft.

Background technique

Center of gravity trimming is an important work before the flight of the aircraft. The position of the center of gravity of an aircraft is very important to its flight stability and safety. For an aircraft launched with rocket boost, the position of its center of gravity has a key influence on the rocket boost process.

To determine the position of the center of gravity of the aircraft, it is necessary to measure at multiple points and then calculate. However, multi-point measurement cannot ensure that multiple points are weighed at the same time, which will cause the measurement point of the aircraft to slide and squeeze and generate large friction, which will seriously affect the measurement accuracy. Many center-of-gravity measuring devices in the traditional sense have low cost and poor accuracy; while those with high precision have high cost and complicated implementation. For example, the invention patent with the application number CN201410687125.6 discloses an intelligent measuring instrument for aircraft weight and center of gravity, including front wheel electronic scale, main engine wheel electronic scale, lifting platform, laser ranging unit, display and control unit, and the display and control unit collects The weight and center of gravity of the front wheel electronic scale, the main wheel electronic scale and the data of the laser distance measuring unit are calculated and displayed. Though this device can realize center of gravity measurement, its cost is expensive, is unfavorable for popularizing and using.

Contents of the invention

The object of the present invention is to solve the problems existing in the prior art and provide a device for measuring the position of the center of gravity of an aircraft.

For realizing above-mentioned purpose of the invention, the technical scheme that the present invention adopts is as follows:

An aircraft center of gravity position measuring device includes a floating plate, a lifting platform and a weight measuring device. The floating plate is fixed on the top of the lifting platform and moves up and down with the lifting platform; at least one of the floating plates is used to support the measurement point on the surface of the aircraft The sliding mechanism, which still has a horizontal sliding degree of freedom when it is close to the measurement point. The weight measuring device is connected with the lifting platform, and is used for measuring the weight supported on the lifting platform.

According to the number of measurement points of the above-mentioned device, several sets of devices are used together. When in use, the floating plate is close to the measurement point of the aircraft through the lifting platform, and then the gravity carried by the floating plate is measured by the weight measuring device. Among them, the floating plate is a key component, which is used to support the measurement point of the aircraft. The main function of the sliding mechanism on it is to eliminate the influence of sideslip, eliminate friction, and improve measurement accuracy.

As a preference, the moving plate includes a base, a steel ball fixing plate, steel balls, a moving plate and an upper cover plate, the steel ball fixing plate is fixed in the base, and several round holes for placing steel balls are arranged on the steel ball fixing plate , the steel ball can rotate in the round hole. The floating plate is placed above the steel balls, and is limited by the upper cover plate in the direction perpendicular to the steel ball fixing plate, so that the floating plate can only slide on the surface formed by different fixed points of the steel balls. The top of the swimming plate is higher than the upper cover plate. After the floating plate is laterally stressed, it will translate in the direction of the force, eliminating the side-slip extrusion and friction at the measurement point.

As a preference, the floating plate body has a raised structure, the top of the raised structure is higher than the upper cover plate, and the gap distance between the upper cover plate and the moving plate should be set so that the moving plate can slide to the limit position will not fall off.

Preferably, the lifting platform is fixed on the top of the weighing device and supported by a mounting frame, and an adjusting base for adjusting the level is provided at the bottom of the mounting frame.

Another object of the present invention is to provide a method for measuring the position of the aircraft center of gravity using the device, the steps are as follows:

Place the aircraft center-of-gravity position measuring device below the measurement point of the aircraft, and make the high-precision scale in a horizontal state; slowly adjust the lifting platform, raise the aircraft, and keep it suspended from the aircraft placement frame; use the horizontal laser instrument to correct the aircraft state, cooperate with the lifting platform to keep the aircraft in a horizontal state; during the adjustment process, use the floating plate to make the sliding mechanism slide horizontally with the measuring point, eliminating sideslip extrusion and friction; when the aircraft is in a horizontal state, Read the readings of the high-precision scale; after completing the readings of different measurement points, determine the position of the center of gravity of the aircraft according to the calculation method of the position of the center of gravity.

Compared with prior art, the present invention has following advantage:

The invention can realize the task of weighing and measuring the center of gravity of the object relatively simply, with low cost, simple steps, short time and high efficiency. This device solves the side-slip extrusion and frictional effects caused by the inability to ensure that multiple points are weighed at the same time during weighing, and greatly improves the weighing accuracy. It provides a solid foundation for precise balance and can be applied to wireless The field of man-machine launch or other aircraft launch.

Description of drawings

Fig. 1 is a schematic structural diagram of an aircraft center-of-gravity position measuring device;

Fig. 2 is a structural schematic diagram of the floating plate of the present invention;

Among the figure: floating plate 1, lifting platform 2, weight measuring device 3, mounting frame 4, adjusting base 5, base 101, steel ball fixed plate 102, steel ball 103, swimming plate 104 and upper cover plate 105.

detailed description

The present invention will be further elaborated and illustrated below in conjunction with the accompanying drawings and embodiments. The technical features of the various implementations in the present invention can be combined accordingly on the premise that there is no conflict with each other.

As shown in FIG. 1 , a device for measuring the position of the center of gravity of an aircraft, the main structure of the device includes a floating plate 1 , a lifting platform 2 and a weight measuring device 3 . The weight measuring device 3 should use a high-precision scale. The floating plate 1 is fixed on the top of the lifting platform 2, and moves up and down with the lifting platform 2. The weight measuring device 3 is connected with the lifting platform 2 and is used for measuring the weight supported on the lifting platform 2 . There is at least one sliding mechanism used to support the measurement point on the surface of the aircraft in the floating plate 1, and the mechanism still has a horizontal sliding degree of freedom when it is close to the measurement point. The horizontal sliding degree of freedom here refers to the ability to move in a direction parallel or approximately parallel to the surface of the aircraft. Thereby, the frictional force in the state of side skidding and squeezing of the aircraft can be eliminated.

In this specific embodiment, as shown in FIG. 2 , the structure of the floating plate 1 includes a base 101 , a steel ball fixing plate 102 , steel balls 103 , a floating plate 104 and an upper cover plate 105 . The base 101 is in the shape of a cylinder without a cover, and the steel ball fixing plate 102 is fixed in the base 101 . The steel ball fixing plate 102 is provided with a plurality of rows of round holes for placing the steel balls 103 . The diameter of the circular hole is slightly larger than the steel ball 103, and the steel ball 103 can rotate freely in the circular hole. The floating plate 104 is placed above the steel ball 103, the surface of the floating plate 104 is smooth, and can be properly lubricated;

The upper cover plate 105 is annular and fixed on the top of the base 101. The lower part of the floating plate 104 is annular, and the upper part has a raised disc structure. The top of the raised structure is higher than the upper cover plate 105, so that it can directly contact with aircraft surfaces. The inner diameter of the upper cover plate 105 is larger than the raised disc structure but smaller than the outer diameter of the lower part of the moving plate 104 . Thus, the gap distance between the upper cover plate 105 and the movable plate 104 can prevent the movable plate 104 from falling off when it slides to the limit position (the disk structure is close to the edge of the upper cover plate). Through the limitation of the upper cover plate 105 in the direction perpendicular to the steel ball fixing plate 102 , the movable plate 104 can only slide on the surface formed by different fixed points of the steel balls 103 .

The above-mentioned structure of the floating plate 1 is only a preferred way that can be realized, and those skilled in the art should know that other configuration ways can also realize this function.

In this specific embodiment, for the convenience of installation and adjustment, the weight measuring device 3 is fixed on the bottom of the lifting platform 2 and supported by the installation frame 4. The bottom of the installation frame 4 is provided with an adjustment base 5 for adjusting the horizontal height. By adjusting up and down, the height can be adjusted. Accuracy called 3 levels of state.

Based on the above-mentioned device, using the method for determining the position of the center of gravity of the aircraft of the device, the steps are as follows:

Place an aircraft center-of-gravity position measurement device under the measurement points of different aircraft, and make the high-precision scale 3 in a horizontal state; slowly adjust the lifting platform 2, raise the aircraft, and keep it suspended from the aircraft stand; use a horizontal laser Correct the state of the aircraft, cooperate with the lifting platform 2 to make the aircraft in a horizontal state; during the adjustment process, use the floating plate 1 to make the sliding mechanism slide horizontally with the measuring point, and eliminate the sideslip extrusion and friction; when the aircraft is in a horizontal state , read the readings of the high-precision scale 3; after completing the readings of different measurement points, determine the position of the center of gravity of the aircraft according to the calculation method of the position of the center of gravity.

The above-described embodiment is only a preferred solution of the present invention, but it is not intended to limit the present invention, and all technical solutions obtained by means of equivalent replacement or equivalent transformation all fall within the protection scope of the present invention Inside.

Claims (5)

1. an aircraft centre of gravity position measuring device, it is characterized in that, including travelling dish (1), lifting platform (2) and Weight measurement device (3), described travelling dish (1) is fixed on lifting platform (2) top, moves up and down with lifting platform (2)；Having at least a slide mechanism measuring point for supporting aircraft surface in travelling dish (1), this mechanism still has horizontal free sliding degree when being adjacent to measurement point；Described Weight measurement device (3) is connected with lifting platform (2), for the upper weight supported of lifting platform (2) is measured。

2. aircraft centre of gravity position measuring device as claimed in claim 1, it is characterized in that, described travelling dish (1) includes base (101), steel ball fixed disk (102), steel ball (103), travelling plate (104) and upper cover plate (105), described steel ball fixed disk (102) is fixed in base (101), steel ball fixed disk (102) is provided with several circular holes placing steel ball (103), and steel ball (103) can rotate in circular hole；Travelling plate (104) is positioned over steel ball (103) top, and spacing in the direction being perpendicular to steel ball fixed disk (102) by upper cover plate (105), make travelling plate (104) be only capable of sliding on the surface that different steel ball (103) fixed points is formed；Travelling plate (104) top is higher than upper cover plate (105)。

3. aircraft centre of gravity position measuring device as claimed in claim 2, it is characterized in that, described travelling plate (104) body has a bulge-structure, bulge-structure top is higher than upper cover plate (105), and the space distance between upper cover plate (105) and travelling plate (104) arranges should meet when travelling plate (104) slides into extreme position and do not come off。

4. aircraft centre of gravity position measuring device as claimed in claim 1, it is characterized in that, described lifting platform (2) is fixed on Weight measurement device (3) top, and supported by installing rack (4), installing rack (4) bottom is provided with the adjusting base (5) for regulating level height。

5. the aircraft centre of gravity position measurement method using device as claimed in claim 1, it is characterised in that step is as follows:

Place a described aircraft centre of gravity position measuring device respectively in the some lower section of measuring of different airborne vehicles, make high accuracy claim (3) to be in level by adjusting base (5)；Slowly regulate lifting platform (2), rise airborne vehicle so that it is depart from airborne vehicle rack and keep unsettled；Utilize horizontal laser light instrument correction aircraft states, coordinate lifting platform (2), make airborne vehicle be in level；In adjustment process, utilize travelling dish (1) to make described slide mechanism along with measuring some level slip, eliminate break away extruding and frictional force；When airborne vehicle is in level, reads high accuracy and claim the reading of (3)；After completing the reading to different measuring point, determine aircraft centre of gravity position according to position of centre of gravity computational methods。