CN113701934A - Torsional pendulum type micro-thrust measuring device and method - Google Patents
Torsional pendulum type micro-thrust measuring device and method Download PDFInfo
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- CN113701934A CN113701934A CN202110982920.8A CN202110982920A CN113701934A CN 113701934 A CN113701934 A CN 113701934A CN 202110982920 A CN202110982920 A CN 202110982920A CN 113701934 A CN113701934 A CN 113701934A
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- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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Abstract
A torsion pendulum type micro-thrust measuring device and method, a trim calibration piece is arranged right above a rotary swing arm which is right opposite to the center of a flexible pivot, so that a groove line of the trim calibration piece is arranged above a horizontal suspension wire, and the coincidence of the center of gravity and the axis of the rotary swing arm is ensured; butting an H-shaped pivot mounting seat on the rotary swing arm with a flexible pivot, and adjusting the levelness of the rotary swing arm by adjusting the screwing depth of pre-tightening spring fixing bolts on four supporting arms of the H-shaped pivot mounting seat; and an upper pipeline and a lower pipeline which are nested with each other are adopted for gas transmission. The torsional pendulum type micro-thrust measuring device and method solve the problems that in the prior art, the gravity center and the levelness of the rotary swing arm are inconvenient to adjust and low in reliability, can achieve non-dragging micro-thrust torsional pendulum measurement, are convenient and quick to process, install and adjust, and can remarkably improve the measurement precision.
Description
Technical Field
The invention relates to a torsional pendulum type micro-thrust measuring device, and belongs to the field of micro-thrust measurement in the propulsion technology.
Background
With the development of international space industry, the requirements of fields such as satellite attitude and orbit control, interstellar navigation and deep space aerospace and the like on thrusters are increasing, the performance requirements are also continuously improved, and electric thrusters with smaller resolution and higher specific impulse become the focus of research and attention at present.
The accurate measurement of the thrust of the space electric thruster is the most important parameter for evaluating the working performance of the electric thruster, and the thrust generated by the space electric thruster through high-voltage discharge generally ranges from 0mN to 100 mN. When the measured thrust range is in the Newton magnitude, the influence of the instrument device and the environment on the thrust measurement is relatively small. However, as the thrust level decreases, particularly when the thrust drops to millinewton or even micro newton levels, the impact of the instrumentation and environment on the thrust measurement makes accurate measurement of the thrust increasingly difficult. The precise measurement of the micro-thrust can truly and intuitively reflect the thrust change caused by the electric parameter and medium parameter change of the propeller, thereby providing a necessary technical approach for the development, design, parameter selection and performance evaluation of the propeller.
At present, the common torsional pendulum type micro-thrust measuring device can be divided into 2 types:
1. the suspension wire torsional pendulum device (see: CN103335769A, zhao feng song, etc., a weak force measuring device of electric propeller) has a typical structure as shown in fig. 1, and is composed of a horizontal beam suspended by a torsion wire, a counterweight, a displacement or angle sensor, a damper, etc. The angular displacement of the torsional pendulum is calibrated by using the standard weak force generated by the ampere force of the magnetic field and the electrified conductor, so that the corresponding relation between the torsional wire deflection angle and the torque is obtained. And calculating the thrust according to the deflection measured when the thruster works and a mathematical relation.
However, the load bearing of the torsion wire of the suspension wire torsion pendulum device is limited, and the torsion wire is difficult to position, and when the requirements of the micro propeller on the mass and the volume are higher, the use of the suspension wire torsion pendulum device is limited due to the defects of weight limitation, difficult positioning and the like of the torsion wire.
2. A typical structure of the flexible pivot supported rotary swing arm torsional pendulum device (see design and experimental research of a subminian-Newton thrust measurement system, Yangtze-super, China optics, 2019,12(03), 526-plus 534 pages) is shown in FIG. 2, is similar to the suspension wire torsional pendulum principle, and is also similar to the suspension wire torsional pendulum principle, a relationship between deflection and thrust of a suspension beam is established according to moment balance, a sensor is used for measuring the rotation angle or displacement of the suspension beam, the thrust of a thruster is indirectly obtained, a mounting hole of the rotary swing arm is fixed, and the weight of a required counterweight block is calculated and estimated to adjust the center of gravity by measuring the weight of main components.
The torsional pendulum type thrust frame has the advantages that the gravity and the thrust of the thruster are effectively separated, so that the influence of the self weight of the thruster and torsional pendulum on the restoring force is eliminated; the executing component is insensitive to longitudinal vibration, and the sensitivity and the linearity can be adjusted by adjusting the length of the swing arm.
However, the torsional pendulum type thrust frame based on deflection displacement measurement has the following disadvantages and problems:
turn round pendulum formula thrust frame at installation or change thrustor or part back at every turn, the focus of rotatory swing arm will change, need trim again, especially to the unable fixed beam structure of balancing weight mounted position, the unable free adjustment in counter weight position, and counter weight is very difficult meticulous to required calculated value. The rotary swing arm is connected with the thrust frame supporting structure through a flexible pivot or a bearing, the levelness of the swing arm is mainly guaranteed by the aid of machining and installation accuracy of a bearing seat, or the levelness of the whole frame structure of the thrust frame is adjusted indirectly, the bearing seat only plays a role in installation and fixation, and the levelness of the swing arm is not enough to guarantee the torque by the aid of machining and installation accuracy. There is no design scheme for directly adjusting the levelness of the torsional pendulum arm. The electric thruster operation requires a propellant supply and an electrical power supply. The linearity and accuracy of micro-thrust measurement are greatly influenced by additional dragging force caused by the pipelines and lines, and the electric thruster is connected with the propellant storage and supply system through the pipelines, so that the rotation of the rotary swing arm is inevitably interfered. In particular, the more minute the measured thrust, the more severe the effect. At present, the influence is reduced as much as possible by means of flexible hoses or means of re-calibrating a thrust frame connected with a pipeline and the like, but the influence is not completely eliminated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a torsion pendulum type micro-thrust measuring device and method which are free of dragging and easy to adjust.
The technical scheme of the invention is as follows:
the utility model provides a little thrust measuring device of torsional pendulum formula, concrete structure is:
including torsional pendulum formula thrust frame quiet frame, rotatory swing arm, H type pivot mount pad, flexible pivot, circuit bridging device, liquid seal air guide connecting piece and trim calibration piece, its characterized in that: the static frame is built into a portal frame type structure, placed in the vacuum container and used for supporting the whole measuring device; the displacement sensor and the permanent magnet are fixed on the two horizontal ground beams at the bottom of the static frame, and the installation position is adjustable; an electric thruster and a damping parallel copper plate are respectively arranged at two ends of the rotary swing arm, and the rotary swing arm is connected with the static frame through a flexible pivot and an H-shaped pivot mounting seat at the upper end of the flexible pivot; the H-shaped pivot mounting seat is arranged at the upper end of the flexible pivot and is connected with the lower surface of the rotary swing arm so as to adjust the levelness of the rotary swing arm; the flexible pivot is fixed on the H-shaped pivot mounting seat through a fastening bolt; the lower end of the liquid seal air guide connecting piece is arranged above the rotary swing arm; the lower end of the circuit bridging device is arranged on the side surface of the rotary swing arm and is opposite to the center of the flexible pivot; the upper end of the liquid seal air guide connecting piece and the upper end of the circuit bridging device are arranged on a top cross beam of the static frame; the trim calibration piece is arranged right above the rotary swing arm which is opposite to the center of the flexible pivot.
Preferably, the measuring device further comprises a cross-slot counterweight block mounting seat, and the position of the counterweight mounted on the counterweight block mounting seat can be freely adjusted.
Preferably, the trim calibration piece has two mutually perpendicular slot lines, and the gravity centers of the rotary swing arm in the length direction and the width direction are verified.
Preferably, one end of the H-shaped pivot mounting seat is connected with the flexible pivot through a fastening bolt, and the other end of the H-shaped pivot mounting seat is provided with four supporting arms; and pre-tightening springs are additionally arranged between the tail end mounting holes of the four supporting arms and the rotary swing arm, and the levelness of the rotary swing arm is adjusted by adjusting the screwing-in depth of the pre-tightening spring fixing bolts, namely the compression length of the pre-tightening springs.
Preferably, the liquid seal gas guide connecting piece comprises an upper pipeline and a lower pipeline which are nested with each other for gas transmission, the upper sleeve is an air inlet sleeve and comprises an air inlet interface, the lower sleeve is an air outlet sleeve and comprises an air outlet interface, and a liquid seal device is arranged between the two sleeves.
Preferably, the stationary frame and the rotary swing arm are made of aluminum profiles.
A micro thrust measurement method adopting a torsional pendulum type micro thrust measurement device comprises the following steps:
step 1: adjusting the gravity center of a rotary swing arm, installing an electric thruster, a parallel copper plate, a circuit bridging device and an H-shaped pivot installation seat on the rotary swing arm, connecting and fixing a power supply cable and an air supply pipe of the electric thruster, estimating the mass of a required counterweight, selecting the number of the counterweights additionally installed in the mass interval, and installing a balancing calibration piece right above the rotary swing arm which is right opposite to the center of a flexible pivot; inverting the rotary swing arm to enable one groove line of the trim calibration piece to be arranged above the horizontal suspension wire; by finely adjusting the front and rear mounting positions of the balance weight, when the rotary swing arm reaches random balance, the adjustment and calibration of the gravity center vertical to the direction of the slot line are completed; then, the other slot line of the balancing calibration piece is arranged above the horizontal suspension wire, and the same operation is carried out; ensuring that the gravity center of the rotary swing arm is superposed with the axis;
step 2: adjusting the levelness of the rotary swing arm, after the balance weight is adjusted, butting an H-shaped pivot mounting seat on the rotary swing arm with the flexible pivot, and fixing the H-shaped pivot mounting seat through a fastening bolt and a positioning hole; the levelness of the rotary swing arm is adjusted by adjusting the screwing-in depth of pre-tightening spring fixing bolts on four supporting arms of the H-shaped pivot mounting seat, namely the compression length of the pre-tightening springs;
and step 3: propellant supply, namely taking down the trim calibration piece, fixing a lower air outlet interface of the liquid seal air guide connecting piece on the rotary swing arm, aligning an upper air inlet interface, fixing the upper air inlet interface with the static frame, and connecting an air inlet joint pipeline and an air outlet joint pipeline;
and 4, step 4: and measuring the thrust, adjusting and installing a circuit bridging device, a permanent magnet, a parallel copper plate and a displacement sensor, and then measuring the micro thrust of the electric thruster.
Preferably, the liquid-seal air guide connecting piece is sealed by silicon oil or liquid metal, so that the damping effect is achieved while air leakage is prevented.
Preferably, a damping system is formed by the permanent magnet and the parallel copper plate, the swinging of the rotary swing arm is restrained by utilizing an eddy current loss principle, the damping ratio of the system is adjusted by adjusting the distance between the permanent magnet and the copper plate, and the optimal damping ratio, namely the optimal distance between the permanent magnet and the copper plate, is determined according to experimental measurement.
Compared with the prior art, the torsional pendulum type micro-thrust measuring device and method have the advantages that:
1. according to the torsional pendulum type micro-thrust measuring device and method, the gravity center of the rotary swing arm can be accurately regulated and controlled to be coincident with the axis of the supporting flexible pivot, the thrust moment measurement is not influenced by the gravity component, and the problems that the gravity center of the rotary swing arm is inconvenient to regulate and the regulation reliability is low in the prior art are solved;
2. according to the torsional pendulum type micro-thrust measuring device and method, the torsional pendulum type thrust frame can adjust the levelness of the cantilever beam arm, the thrust of the thruster is ensured to be in the horizontal plane, the measurement of gravity on the thrust result is eliminated, the problem of levelness adjustment of the rotary swing arm in the prior art is solved, the design is simplified, and the torsional pendulum type micro-thrust measuring device and method are convenient and practical;
3. according to the torsional pendulum type micro-thrust measurement device and method, the drag-free connection device supplied by the air passage of the electric thruster is designed aiming at the torsional pendulum type thrust frame, the direct acting force of the air passage supply pipeline of the electric thruster on the rotating swing arm is eliminated, and the drag-free micro-thrust torsional pendulum measurement is realized and the measurement precision is improved by combining the circuit bridging design based on the liquid box design.
4. According to the torsional pendulum type micro-thrust measuring device and method, the thrust frame main body is built by adopting the standard aluminum profile, so that the cost is low; the combined type micro thrust measuring system is provided with matched standard assembling connecting pieces, is very convenient and quick to process, install and adjust, can adjust, replace and add components according to actual conditions, is wide in applicability, and can also be referred to and popularized and used in other micro thrust measuring systems.
Drawings
FIG. 1 is a schematic structural diagram of a suspension wire torsional pendulum device in the prior art;
FIG. 2 is a schematic structural diagram of a rotary swing arm torsional pendulum device in the prior art;
FIG. 3 is a schematic view of the overall structure of a torsional pendulum type micro-thrust measuring device according to the present invention;
FIG. 4 is a schematic structural diagram of a trim calibration piece of the torsional pendulum type micro-thrust measurement apparatus of the present invention;
FIG. 5 is a schematic structural view of an H-shaped pivot mounting base of a torsional pendulum type micro-thrust measuring device according to the present invention;
fig. 6 is a schematic structural diagram of an air path bridging device of the torsional pendulum type micro-thrust measuring device of the present invention.
Description of the attached table designations:
1-electric thruster 2-rotary swing arm 3-H type pivot mounting base
4-fastening bolt 5-flexible pivot 6-circuit bridging device
7-liquid seal air guide connecting piece 8-static frame 9-counterweight
10-counterweight block mounting seat 11-copper plate 12-permanent magnet
13-displacement sensor 14-corner fitting
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a torsional pendulum type micro-thrust measuring device, the specific structure of which is shown in figure 3, and the torsional pendulum type micro-thrust measuring device comprises: the torsional pendulum type thrust frame static frame 8 and the rotary swing arm 2, wherein the static frame 8 is built into a portal frame type structure by 6 aluminum profiles, is placed in a vacuum container and is used for supporting the whole measuring device; displacement sensor 13, permanent magnet 12 pass through the aluminium alloy and fix to two horizontal ground beams in quiet frame 8 bottom, and the mounted position can be adjusted as required at will. The rotary swing arm 2 is an aluminum profile, two ends of the rotary swing arm are respectively used for mounting the electric thruster 1 and the damping copper plate 11, and the rotary swing arm 2 is connected with the static frame 8 through the flexible pivot 5 and an H-shaped pivot mounting base 3 at the upper end of the flexible pivot 5 and a mounting base at the lower end of the flexible pivot. The H-shaped pivot mounting seat 3 is arranged at the upper end of the flexible pivot 5 and is connected with the lower surface of the rotary swing arm 2; the H-shaped pivot mounting seat 3 fixes the flexible pivot 5 through a fastening bolt 4 and can adjust the levelness of the rotary swing arm 2. The lower part of the liquid seal air guide connecting piece 7 is arranged above the rotary swing arm 2, and the lower part of the circuit bridging device 6 is arranged on the side surface of the rotary swing arm 2 and is opposite to the center of the flexible pivot 5; the upper part of the liquid seal air guide connecting piece 7 and the upper part of the circuit bridging device 6 are arranged on the uppermost beam of the static frame 8 and are respectively opposite to the rotary swing arm 2.
The structure of the balancing calibration piece is shown in fig. 4, the balancing calibration piece has two mutually perpendicular slot lines, and the center of gravity of the rotary swing arm 2 in the length direction and the width direction can be verified. Meanwhile, a cross-shaped groove counterweight block mounting seat 10 is designed, and the mounting position of the counterweight 9 can be freely adjusted. After the installation or replacement of the electric thruster 1, the counterweight 9 and other components, a trim calibration piece is installed directly above the rotary oscillating arm 2, with its centre concentric with the flexible pivot 5. And (3) placing a groove line of the balancing calibration piece on the rotary swing arm 2 on the suspension wire, and then finely adjusting the mounting position of the balance weight 9 to balance the rotary swing arm 2, and at the moment, adjusting and calibrating the gravity center of the rotary swing arm 2 in the direction. And then the other slotline of the trim calibration piece is placed on the suspension wire, and the same operation is carried out. The gravity center of the rotary swing arm 2 can be strictly coincided with the axis, and the gravity center position of the thrust frame can be conveniently, quickly, reliably and accurately adjusted.
The structure of the H-shaped pivot mounting seat 3 is shown in fig. 5, on one hand, the H-shaped pivot mounting seat 3 is connected with the flexible pivot 5 through a fastening bolt 4, on the other hand, a pre-tightening spring is additionally arranged between the tail end mounting holes of the four supporting arms and the rotary swing arm 2, and the levelness of the rotary swing arm 2 is adjusted by adjusting the screwing depth of the pre-tightening spring fixing bolt, namely the compression length of the pre-tightening spring.
The structure of the liquid seal gas guide connecting piece 7 is shown in fig. 6, and comprises an upper pipeline and a lower pipeline which are nested with each other for gas transmission, wherein the upper sleeve is an air inlet sleeve, the lower sleeve is an air outlet sleeve, and a liquid seal device is arranged between the two sleeves; liquid such as liquid metal can be adopted between the two sleeves to realize liquid seal to prevent air leakage, and meanwhile, the damping effect is achieved, and the air supply pipe is replaced to be directly connected with the electric thruster on the rotary swing arm.
The damping system of the torsional pendulum type micro-thrust measuring device consists of a permanent magnet 12 and a parallel copper plate 11, the swinging of the rotary swing arm 2 is restrained by utilizing the eddy current loss principle, the damping ratio of the system is adjusted by adjusting the distance between the permanent magnet 12 and the copper plate 11, and the optimal damping ratio, namely the optimal distance between the permanent magnet 12 and the copper plate 11, is determined according to experimental measurement.
The invention provides a torsional pendulum type micro-thrust measuring method, which comprises the following steps:
step 1: the gravity center of the rotary swing arm is adjusted, the electric thruster 1, the parallel copper plate 11, the circuit bridging device 6 and the H-shaped pivot mounting base 3 are mounted on the rotary swing arm 2, after a power supply cable and an air supply pipe of the electric thruster 1 are connected and fixed, the mass of the required balance weight 9 is estimated, the number of the balance weights 9 added in the mass interval is selected, and a balance calibration piece is mounted right above the rotary swing arm 2 which is right opposite to the center of the flexible pivot 5. And inverting the rotary swing arm 2 to enable one groove line of the trim calibration piece to be arranged above the horizontal suspension wire. Through the front and back installation positions of the fine adjustment balance weight 9, when the rotary swing arm 2 reaches random balance, the gravity center adjustment and calibration in the direction perpendicular to the slot line are completed. And then the other grooved line is arranged above the horizontal suspension wire, and the same operation is carried out. The gravity center of the rotary swing arm 2 is ensured to be coincided with the axis;
step 2: and adjusting the levelness of the rotary swing arm, after the balance weight 9 is adjusted, butting an H-shaped pivot mounting seat on the rotary swing arm 2 with the flexible pivot 5, and fixing the H-shaped pivot mounting seat through a fastening bolt 4 and a positioning hole. The levelness of the rotary swing arm 2 is adjusted by adjusting the screwing-in depth of pre-tightening spring fixing bolts on four supporting arms of the H-shaped pivot mounting seat, namely the compression length of the pre-tightening springs;
and step 3: propellant supply, take off the trim calibration part, fix the lower part of the liquid seal air guide connecting piece 7 to the rotary swing arm 2, and fix the upper part air inlet interface with the support frame after aligning, seal with silicone oil, if considering that the oil molecule diffuses and pollutes the vacuum chamber, can also replace with liquid metal, connect and enter, give vent to anger the joint pipeline well;
and 4, step 4: and (3) measuring the thrust, adjusting and installing the circuit bridging device 6, the permanent magnet 12, the parallel copper plate 11 and the displacement sensor 13, and calibrating the thrust frame by adopting other weak force generating devices or standard weights, so that the micro-thrust measurement of the electric thruster can be carried out after the calibration.
The above-described embodiments are merely preferred embodiments of the present invention, which is not intended to limit the present invention in any way. Those skilled in the art can make many changes, modifications, and equivalents to the embodiments of the invention without departing from the scope of the invention as set forth in the claims below. Therefore, equivalent variations made according to the idea of the present invention should be covered within the protection scope of the present invention without departing from the contents of the technical solution of the present invention.
Claims (9)
1. The utility model provides a little thrust measuring device of torsional pendulum formula, includes torsional pendulum formula thrust frame quiet frame, rotatory swing arm, H type pivot mount pad, flexible pivot, circuit bridging device, liquid seal air guide connecting piece and trim calibration piece, its characterized in that: the static frame is built into a portal frame type structure, placed in the vacuum container and used for supporting the whole measuring device; the displacement sensor and the permanent magnet are fixed on the two horizontal ground beams at the bottom of the static frame, and the installation position is adjustable; an electric thruster and a damping parallel copper plate are respectively arranged at two ends of the rotary swing arm, and the rotary swing arm is connected with the static frame through a flexible pivot and an H-shaped pivot mounting seat at the upper end of the flexible pivot; the H-shaped pivot mounting seat is arranged at the upper end of the flexible pivot and is connected with the lower surface of the rotary swing arm so as to adjust the levelness of the rotary swing arm; the flexible pivot is fixed on the H-shaped pivot mounting seat through a fastening bolt; the lower end of the liquid seal air guide connecting piece is arranged above the rotary swing arm; the lower end of the circuit bridging device is arranged on the side surface of the rotary swing arm and is opposite to the center of the flexible pivot; the upper end of the liquid seal air guide connecting piece and the upper end of the circuit bridging device are arranged on a top cross beam of the static frame; the trim calibration piece is arranged right above the rotary swing arm which is opposite to the center of the flexible pivot.
2. The torsional pendulum type micro thrust measuring device according to claim 1, further comprising a cross-recessed counterweight block mounting base, wherein a position of the counterweight mounted on the counterweight block mounting base can be freely adjusted.
3. The torsional pendulum type micro thrust measurement device according to claim 2, wherein the trim calibration piece has two mutually perpendicular groove lines for verifying the gravity centers of the rotary swing arm in both the length and width directions.
4. The torsional pendulum type micro thrust measurement device according to claim 2, wherein one end of the H-shaped pivot mounting base is connected with the flexible pivot through a fastening bolt, and the other end is provided with four supporting arms; and pre-tightening springs are additionally arranged between the tail end mounting holes of the four supporting arms and the rotary swing arm, and the levelness of the rotary swing arm is adjusted by adjusting the screwing-in depth of the pre-tightening spring fixing bolts, namely the compression length of the pre-tightening springs.
5. The torsional pendulum type micro-thrust measuring device of claim 2, wherein the liquid seal gas guide connecting piece comprises an upper pipeline and a lower pipeline which are nested with each other for gas transmission, the upper sleeve is an air inlet sleeve and comprises an air inlet interface, the lower sleeve is an air outlet sleeve and comprises an air outlet interface, and a liquid seal device is arranged between the two sleeves.
6. The torsional pendulum type micro thrust measuring device according to any one of claims 2 to 5, wherein the stationary frame and the rotating swing arm are made of aluminum profiles.
7. A minute thrust measuring method using the torsion pendulum type minute thrust measuring apparatus according to any one of claims 2 to 6, comprising the steps of:
step 1: adjusting the gravity center of a rotary swing arm, installing an electric thruster, a parallel copper plate, a circuit bridging device and an H-shaped pivot installation seat on the rotary swing arm, connecting and fixing a power supply cable and an air supply pipe of the electric thruster, estimating the mass of a required counterweight, selecting the number of the counterweights additionally installed in the mass interval, and installing a balancing calibration piece right above the rotary swing arm which is right opposite to the center of a flexible pivot; inverting the rotary swing arm to enable one groove line of the trim calibration piece to be arranged above the horizontal suspension wire; by finely adjusting the front and rear mounting positions of the balance weight, when the rotary swing arm reaches random balance, the adjustment and calibration of the gravity center vertical to the direction of the slot line are completed; then, the other slot line of the balancing calibration piece is arranged above the horizontal suspension wire, and the same operation is carried out; ensuring that the gravity center of the rotary swing arm is superposed with the axis;
step 2: adjusting the levelness of the rotary swing arm, after the balance weight is adjusted, butting an H-shaped pivot mounting seat on the rotary swing arm with the flexible pivot, and fixing the H-shaped pivot mounting seat through a fastening bolt and a positioning hole; the levelness of the rotary swing arm is adjusted by adjusting the screwing-in depth of pre-tightening spring fixing bolts on four supporting arms of the H-shaped pivot mounting seat, namely the compression length of the pre-tightening springs;
and step 3: propellant supply, namely taking down the trim calibration piece, fixing a lower air outlet interface of the liquid seal air guide connecting piece on the rotary swing arm, aligning an upper air inlet interface, fixing the upper air inlet interface with the static frame, and connecting an air inlet joint pipeline and an air outlet joint pipeline;
and 4, step 4: and measuring the thrust, adjusting and installing a circuit bridging device, a permanent magnet, a parallel copper plate and a displacement sensor, and then measuring the micro thrust of the electric thruster.
8. The micro-thrust measuring method according to claim 7, wherein the liquid-sealed air guide connecting piece is sealed by silicone oil or liquid metal, so that the damping effect is achieved while air leakage is prevented.
9. The micro-thrust measuring method according to claim 7, wherein a damping system is composed of a permanent magnet and a parallel copper plate, the wobbling of the rotary swing arm is suppressed by using an eddy current loss principle, a damping ratio of the system is adjusted by adjusting a distance between the permanent magnet and the copper plate, and an optimal damping ratio, that is, an optimal distance between the permanent magnet and the copper plate, is determined according to experimental measurement.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114235251A (en) * | 2021-12-03 | 2022-03-25 | 北京东方计量测试研究所 | Thrust measuring device of plasma thruster under vacuum |
| CN114993531A (en) * | 2022-05-09 | 2022-09-02 | 国科大杭州高等研究院 | Weak force measuring device and method based on closed-loop control of cold air thruster |
| CN116026508A (en) * | 2023-03-29 | 2023-04-28 | 中国人民解放军火箭军工程大学 | Vibration isolation structure of micro-thrust measuring system |
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