CN116907716B - Thermal noise suppression based torsion pendulum type micro-thrust measuring device and method - Google Patents
Thermal noise suppression based torsion pendulum type micro-thrust measuring device and method Download PDFInfo
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- CN116907716B CN116907716B CN202311177031.XA CN202311177031A CN116907716B CN 116907716 B CN116907716 B CN 116907716B CN 202311177031 A CN202311177031 A CN 202311177031A CN 116907716 B CN116907716 B CN 116907716B
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- 230000001629 suppression Effects 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005259 measurement Methods 0.000 claims abstract description 33
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 238000006073 displacement reaction Methods 0.000 claims description 26
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 238000000691 measurement method Methods 0.000 claims description 4
- 238000002474 experimental method Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 5
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000004044 response Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009828 non-uniform distribution Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
- G01L5/0038—Force sensors associated with force applying means applying a pushing force
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The application relates to a thermal noise suppression torsion pendulum-based micro-thrust measuring device and a thermal noise suppression torsion pendulum-based micro-thrust measuring method, wherein the device is provided with a standard force generating device and a position detecting device, in the measuring process, the standard force generating device applies standard force in the direction opposite to that of a measured thruster, the balance of torsion wires can be determined through measurement of the position detecting device, and the thrust generated by the measured thruster can be obtained through the relation between voltage and force obtained through calibration before measurement. Through the mode of standard force compensation, the states of the torsion wires before and after the thruster generates thrust are the same, and errors caused by traditional measurement of torsion angles of the torsion wires are effectively avoided. According to the method, the first temperature detection device and the second temperature detection device are arranged, the temperatures at two ends of the torsion wire are monitored in real time respectively, the temperature of the torsion wire is actively regulated through the temperature control device, so that the temperature trend of the torsion wire in the length direction is uniformly distributed, the torsion elasticity coefficient of the torsion wire at different temperatures is calculated conveniently, and the measurement accuracy is further improved.
Description
Technical Field
The application relates to the technical field of micro-thrust measurement, in particular to a thermal noise suppression torsion pendulum-based micro-thrust measurement device and method.
Background
The micropeller has important application in the control of satellite towless and formation flight and relative position maintenance. The thrust measuring device can accurately measure the thrust of the thruster, and has important significance in performance characterization and practical application of the thruster. In recent years, various thrust measuring techniques of thrusters, such as a torsion pendulum structure, a balance structure, a simple pendulum structure, a double pendulum structure, etc., have been developed at home and abroad. The torsion pendulum structure is widely applied to the field of precise measurement as an effective weak force measuring tool, and along with the miniaturization of the quality and the volume of the thruster, the torsion pendulum structure is increasingly used in the measurement experiment of the thruster.
In the related art, the torsion pendulum structure works in a vacuum environment and comprises a torsion wire and a balance rod, one end of the torsion wire is connected to the middle of the balance rod, the tested thruster is arranged on the balance rod, and the thrust is finally obtained by means of balance calculation of the moment generated by the thrust of the tested thruster and the torsion wire deflection moment through measurement of torsion angle displacement of the torsion wire or the angular displacement of the balance rod.
Because the thruster works to generate a large amount of heat, and no heat convection loss exists in the vacuum environment, the heat is mainly radiated and diffused through heat conduction, therefore, the thruster works to generate a large amount of heat, and because no heat convection loss exists in the vacuum environment, the heat is mainly radiated and diffused through heat conduction, in the thrust measurement process, the torsion wire generates non-uniform temperature distribution, the shearing coefficient of the torsion wire material is influenced, the Poisson ratio and the like, the torsion elasticity coefficient of the torsion wire is difficult to accurately solve, and the precision and the sensitivity of the torsion pendulum structure are both dependent on the characteristics of the torsion elasticity coefficient, so that the thrust measurement precision is influenced.
Disclosure of Invention
Based on the above, it is necessary to provide a device and a method for measuring micro-thrust based on thermal noise suppression torsion pendulum aiming at the problem that heat generated by the operation of a thruster is conducted to a torsion wire, and the torsion wire generates non-uniform temperature distribution, so that the torsion elasticity coefficient of the torsion wire is difficult to accurately solve and the thrust measurement accuracy is affected.
The application provides a based on thermal noise suppresses torsion pendulum formula micro thrust measuring device, include:
one end of the torsion wire is fixedly connected with a vibration isolation platform;
the other end of the torsion wire is fixedly connected to the middle part of the balance rod; one end of the balance rod is used for installing a tested thruster;
the standard force generating device is used for applying standard force opposite to the thrust direction of the tested thruster to the other end of the balance bar;
the displacement detection device is used for detecting the angular displacement of the balance rod relative to the center of the torsion wire;
the first temperature detection device is used for monitoring the temperature of the first end of the torsion wire in real time;
the second temperature detection device is used for monitoring the temperature of the second end of the torsion wire in real time;
the temperature control device is used for actively adjusting the temperature of the torsion wire according to the temperature of the first mild end and the second end of the torsion wire so that the temperature of the torsion wire tends to be uniformly distributed in the length direction;
the standard force generating device, the first temperature detecting device, the second temperature detecting device and the temperature control device are respectively and electrically connected to the control device.
The application also provides a torsion pendulum type micro-thrust measuring method based on thermal noise suppression, which is applied to the torsion pendulum type micro-thrust measuring device based on thermal noise suppression; the torsional pendulum type micro-thrust measuring method based on thermal noise suppression comprises the following steps:
respectively acquiring the current temperatures of a first end and a second end of the torsion wire in real time;
actively adjusting the temperature of the first end or/and the second end according to the current temperature of the first end and the second end of the torsion wire so that the temperature of the torsion wire tends to be uniformly distributed in the length direction;
calculating the torsional elasticity coefficient of the torsion wire according to formula 1;
1 (1)
Wherein K is 0 At a wire twisting temperature of t 0 The coefficient of torsional elasticity at the time of the process,a linear temperature coefficient which is a torsional elastic coefficient; t is the temperature value of the torsion wire when the temperature tends to be uniformly distributed; />Is the torsional elasticity coefficient of the torsion wire at the current overall temperature of t.
The application relates to a thermal noise suppression torsion pendulum-based micro-thrust measuring device and a thermal noise suppression torsion pendulum-based micro-thrust measuring method, wherein the device is provided with a standard force generating device and a position detecting device, in the measuring process, the standard force generating device applies standard force in the direction opposite to that of a measured thruster, the balance of torsion wires can be determined through measurement of the position detecting device, and the thrust generated by the measured thruster can be obtained through the relation between voltage and force obtained through calibration before measurement. Through the mode of standard force compensation, the states of the torsion wires before and after the thruster generates thrust are the same, and errors caused by traditional measurement of torsion angles of the torsion wires can be effectively avoided. In addition, this application carries out real-time supervision through setting up first temperature-detecting device and second temperature-detecting device to the temperature at wire both ends respectively to carry out initiative regulation to the temperature of wire through temperature control device, so that wire in the ascending temperature trend evenly distributed of length, be convenient for calculate the torsional elasticity coefficient of wire under different temperatures, further improve measurement accuracy.
Drawings
Fig. 1 is a schematic structural diagram of a thermal noise suppression torsional micro-thrust measuring device according to a first embodiment of the present application.
Fig. 2 is a block diagram of a thermal noise suppression torsional micro-thrust measuring device according to a first embodiment of the present application.
Fig. 3 is a schematic structural diagram of a thermal noise suppression torsional micro-thrust measuring device according to a second embodiment of the present application.
Fig. 4 is a schematic structural diagram of a thermal noise suppression torsional micro-thrust measuring device according to a third embodiment of the present application.
Fig. 5 is a schematic structural diagram of a thermal noise suppression torsional micro-thrust measuring device according to a fourth embodiment of the present application.
Fig. 6 is a flow chart of a thermal noise suppression torsion pendulum based micro-thrust measurement method according to an embodiment of the present application.
Reference numerals:
100-a torsional pendulum type micro-thrust measuring device based on thermal noise suppression; 110-twisting; 111-a first end; 112-a second end;
120-balancing bars; 130-standard force generating means; 140-displacement detection means;
141-a laser displacement sensor; 151-a first temperature detection device; 152-a second temperature detection device;
153-temperature control device; 160-a control device; 201-a sleeve; 201 a-a central passage;
251-a first temperature detection device; 252-second temperature detecting means; 253—temperature control device;
170-a counterweight device; 171-a first weight; 172-a second counterweight; 173-a first permanent magnet;
174-a second permanent magnet; 180-vibration isolation platform.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The application provides a thermal noise suppression based torsional pendulum type micro-thrust measuring device 100.
As shown in fig. 1 and 2, in an embodiment of the present application, the thermal noise suppression-based torsion pendulum type micro-thrust measuring device 100 includes a torsion wire 110, a balance bar 120, a standard force generating device 130, a displacement detecting device 140, a first temperature detecting device 151, a second temperature detecting device 152, a temperature controlling device 153 and a controlling device 160.
Specifically, one end of the torsion wire 110 is fixedly connected to a vibration isolation platform 180 for isolating the interference of the environmental vibration. The other end of the torsion wire 110 is fixedly connected to the middle part of the balance bar 120, and the torsion wire 110 is straightened in the vertical direction at least under the action of the weight of the balance bar 120, and the balance bar 120 is in a horizontal state. One end of the balance bar 120 is used for installing the tested thruster 300.
The standard force generating device 130 is used for applying a standard force opposite to the thrust direction of the tested thruster to the other end of the balance bar 120. Alternatively, the standard force generating device 130 may employ a comb drive comprising two rows of teeth that snap into one another, one fixed to the balance bar 120 and the other fixed to the device frame. The comb drive is prior art and will not be described in detail. During the measurement, the torsion wire 110, the balance bar 120 and the standard force generating device 130 are all located in a vacuum chamber.
The displacement detecting device 140 is used for detecting the angular displacement of the balance bar 120 relative to the center of the torsion wire 110. Alternatively, the displacement detecting device 140 includes two sets of high-precision laser displacement sensors 141, the laser displacement sensors 141 are installed outside the vacuum chamber, the two laser displacement sensors 141 project light to the balance bar 120 through the observation window, and the angular displacement of the balance bar 120 relative to the torsion wire 110 is measured by differential method.
The first temperature detecting device 151 is configured to monitor the temperature of the first end 111 of the torsion wire 110 in real time. The second temperature detecting device 152 is used for monitoring the temperature of the second end 112 of the torsion wire 110 in real time. More specifically, the first end 111 refers to an end of the torsion wire 110 away from the balance bar 120, and the second end 112 refers to an end of the torsion wire 110 near the balance bar 120. The temperature control device 153 is configured to actively adjust the temperature of the torsion wire 110 according to the temperature of the first and second ends 112 of the torsion wire 110, so that the temperature of the torsion wire 110 tends to be uniformly distributed in the length direction.
The standard force generating device 130, the displacement detecting device 140, the first temperature detecting device 151, the second temperature detecting device 152, and the temperature controlling device 153 are electrically connected to the control device 160, respectively. The control device 160 may be an industrial personal computer, and is at least configured to adjust the standard force output by the standard force generating device 130 according to the angular displacement of the balance bar 120 detected by the displacement detecting device 140, so that the torsion wire 110 is at the balance position. And the temperature control device 153 is used for controlling the temperature of the torsion wire 110 to be actively adjusted according to the temperature difference between the first end 111 and the second end 112 obtained through monitoring.
In this embodiment, by providing the standard force generating device 130 and the position detecting device, the standard force generating device 130 applies the standard force in the opposite direction to the measured thruster 300 during the measurement, the balance of the torsion wire 110 can be determined by the measurement of the position detecting device, and the thrust force generated by the measured thruster 300 can be obtained by the relationship between the voltage and the force obtained by calibration before the measurement. By means of standard force compensation, the states of the torsion wire 110 before and after the thrust is generated by the thruster are the same (namely the balance positions), and errors caused by traditional measurement of the torsion angle of the torsion wire 110 can be effectively avoided.
In addition, this application carries out real-time supervision through setting up first temperature-detecting device 151 and second temperature-detecting device 152 to the temperature of wire 110 both ends respectively to carry out initiative regulation to the temperature of wire 110 through temperature control device 153, so that wire 110 tends evenly distributed at length direction's temperature, be convenient for calculate wire 110 torsional elasticity coefficient under different temperatures, further improve measurement accuracy.
Since the heat generated by the measured thruster 300 is conducted from the second end 112 to the first end 111 of the torsion wire 110, the temperature of the second end 112 may be significantly higher than that of the first end 111, resulting in a non-uniform distribution of the temperature over the torsion wire 110.
As shown in fig. 1, in an embodiment of the present application, a temperature control device 153 is disposed at the first end 111 of the torsion wire 110 to heat the first end 111.
In this embodiment, by providing the temperature control device 153 at the first end 111, the first end 111 of the torsion wire 110 is actively heated, so that the temperature of the first end 111 actively changes along with the temperature of the second end 112, and the temperature of the whole torsion wire 110 tends to be uniformly distributed.
Based on the above scheme, the temperature distribution of the torsion wire 110 is maintained to be uniform by adopting the heating mode of the first end 111, however, the heat generated by the thruster under different power outputs is changed, so that the torsion wire 110 is heated and cooled to different degrees, and frequent temperature changes can influence the ability of the torsion wire 110 to recover to the equilibrium position.
In another embodiment of the present application, as shown in fig. 3, temperature control devices 153 are provided at the first end 111 and the second end 112 of the torsion wire 110, respectively, to heat the first end 111 and the second end 112 simultaneously.
In the present embodiment, by providing the temperature control device 153 at both the first end 111 and the second end 112, the overall temperature of the torsion wire 110 in the length direction tends to the set temperature. The set temperature is experimentally calibrated to be higher than the indicated temperature and greater than the maximum possible temperature rise at the second end 112. By adopting the heating mode, the temperature of the torsion wire 110 is kept, so that the temperature of the torsion wire 110 is not affected by the measured thruster 300 and is changed frequently, the capability of restoring the torsion wire 110 to the balance position is maintained, and the measurement accuracy is further improved. And only heating is needed without refrigeration, so that the feasibility is high and the operability is strong.
In addition, since the elastic modulus of the torsion wire 110 is a function of temperature, a change in temperature thereof affects the elastic modulus, thereby changing the natural frequency of the torsion wire 110. Based on the above, by analyzing the noise of the test environment, the frequency range of the main noise in the test environment is determined, and then the temperature control range of the torsion wire 110 is determined, so that the natural frequency of the torsion wire 110 avoids the frequency range of the main noise in the test environment, and the measurement accuracy is further improved.
In an embodiment of the present application, the first temperature detecting device 151 and the second temperature detecting device 152 are both patch type temperature sensors, so as to facilitate installation.
In an embodiment of the present application, the temperature control device 153 is a patch heater, which is convenient for installation and realizes rapid heating.
Based on the above heating scheme, since the first temperature detecting device 151, the second temperature detecting device 152 and the temperature control device 153 are all attached to the torsion wire 110, resistance influences exist on torsion and balance restoration of the torsion wire 110, so that stress of the torsion wire 110 is unevenly distributed, and response of the torsion wire 110 to thrust is affected. Whereas for measurements of micro-bovine thrusters, a high demand is placed on the rapid response of the torsion wire 110. In addition, the arrangement of the power supply lines to which the first temperature detecting device 151, the second temperature detecting device 152, and the temperature controlling device 153 are connected, and the action of gravity, also affect the response of the torsion wire 110 to the thrust force.
As shown in fig. 4, in an embodiment of the present application, as an alternative implementation manner of the first temperature detecting device 251, the second temperature detecting device 252 and the temperature control device 253, the torsional pendulum type micro-thrust measuring device 100 based on thermal noise suppression further includes a sleeve 201, a central channel 201a is disposed inside the sleeve 201 in a penetrating manner along an axial direction, one end of the sleeve 201 is fixedly connected to the vibration isolation platform 180 and sleeved on the torsion wire 110, and a central axis of the torsion wire 110 coincides with a central axis of the central channel 201 a.
The first temperature detecting device 251 and the second temperature detecting device 252 respectively adopt infrared temperature measuring sensors and are respectively and fixedly connected to different axial positions of the sleeve 201, the first temperature detecting device 251 is used for detecting the temperature of the first end 111 of the torsion wire 110, and the second temperature detecting device 252 is used for detecting the temperature of the second end 112 of the torsion wire 110.
The temperature control device 253 employs a patch heater, and in the axial direction of the sleeve 201, the temperature control device 253 is located between the first temperature detection device 251 and the second temperature detection device 252, and is attached to the inner wall of the central passage 201 a.
In the present embodiment, the wire 110 is subjected to non-contact temperature measurement and heating by providing the sleeve 201 and attaching the first temperature detecting device 251, the second temperature detecting device 252, and the temperature control device 253 to the sleeve 201. And further, the torsion and the balance recovery of the torsion wire 110 are not influenced, so that the stress of the torsion wire 110 is uniformly distributed, the quick response of the torsion wire 110 to the micro-thrust is ensured, and the measurement accuracy is improved.
As shown in fig. 1, in an embodiment of the present application, the thermal noise suppression torsion pendulum-based micro thrust measuring device 100 further includes a weight device 170, wherein the weight device 170 is configured to balance deflection in a vertical plane caused by weights or mounting positions of the measured thruster 300 and the standard force generating device 130, so that the balance bar 120 tends to be horizontal.
As shown in fig. 1, in an embodiment of the present application, the weight device 170 includes a first weight 171 and a second weight 172.
Specifically, the first weight 171 is fixedly connected to the balance bar 120 and is located between the standard force generating device 130 and the torsion wire 110. The second weight 172 is fixedly connected to the balance bar 120 and is located between the measured thruster 300 and the torsion wire 110.
In the present embodiment, the measured thruster 300 and the standard force generating device 130 are weighted by providing the first and second weight members 171 and 172, by defining the installation positions of the first and second weight members 171 and 172 at the balance bar 120, or adjusting the forces applied by the first and second weight members 171 and 172 so that the balance bar 120 tends to be horizontal.
In one possible embodiment, the force applied by the first and second weight members 171, 172 is generated by the weight of the first and second weight members 171, 172 themselves.
Based on the above weight scheme, during the test, the states (force application and position) of the first weight 171 and the second weight 172 are not changed, but the measured thruster 300 continuously consumes working medium during the operation, so that the balance bar 120 may incline to the measured thruster 300 side to deviate from the horizontal state, and the unbalance amount is in a dynamic change state, reducing the thrust measurement accuracy.
As shown in fig. 5, in an embodiment of the present application, the first weight 171 and the second weight 172 each use an electromagnet. The counterweight device 170 further includes a first permanent magnet 173 and a second permanent magnet 174, the first permanent magnet 173 corresponds to the first counterweight 171, the second permanent magnet 174 corresponds to the second counterweight 172, and the first permanent magnet 173 and the second permanent magnet 174 are isolated from each other.
In this embodiment, by setting the first weight 171 and the second weight 172 as electromagnets, according to the power of the measured thruster 300 and the working medium consumed during the working time, the working current of the first weight 171 and/or the second weight 172 is adjusted, so as to adjust the magnetic force between the first weight 171 and the first permanent magnet 173, and the magnetic force between the second weight 172 and the second permanent magnet 174, and dynamically adjust the weights on both sides of the balance bar 120, so that the balance bar 120 is always in a horizontal state, and the thrust measurement accuracy is improved.
The application also discloses a thermal noise suppression based torsion pendulum type micro-thrust measuring method which is applied to the thermal noise suppression based torsion pendulum type micro-thrust measuring device 100.
As shown in fig. 6, in an embodiment of the present application, the thermal noise suppression torsion pendulum-based micro thrust measurement method includes the following S100 to S300.
S100, respectively acquiring the current temperatures of the first end and the second end of the torsion wire in real time.
And S200, actively adjusting the temperature of the first end or/and the second end according to the current temperature of the first end and the current temperature of the second end of the torsion wire so that the temperature of the torsion wire tends to be uniformly distributed in the length direction.
S300, calculating the torsional elasticity coefficient of the torsion wire according to the formula 1.
1 (1)
Wherein K is 0 At a wire twisting temperature of t 0 The coefficient of torsional elasticity at the time of the process,is the linear temperature coefficient of the torsional elasticity coefficient. t is the temperature value of the torsion wire when the temperature tends to be uniformly distributed. />Is the torsional elasticity coefficient of the torsion wire at the current overall temperature of t.
In a specific embodiment, the torsion wire is a pure tungsten wire, and the torsion wire is made of a pure tungsten wire by referring to the test result of the thermoelastic effect of the pure tungsten wire in the prior art,about (-115.6.+ -. 2.0). Times.10) -6 /℃。
In this embodiment, the temperature of the two ends of the torsion wire is monitored in real time, and the temperature of the torsion wire is actively adjusted according to the real-time temperature of the two ends of the torsion wire, so that the temperature trend of the torsion wire in the length direction is uniformly distributed, the torsion elasticity coefficients of the torsion wire at different temperatures are accurately calculated, and the measurement accuracy is further improved.
In an embodiment of the present application, the S200 includes the following S210a.
S210a, controlling the temperature control device to actively heat the first end of the torsion wire according to the current temperatures of the first end and the second end of the torsion wire, so that the overall temperature of the torsion wire in the length direction tends to the current temperature of the second end.
In this embodiment, the first end of the torsion wire is actively heated, so that the temperature of the first end actively changes along with the second end, and the temperature of the whole torsion wire tends to be uniformly distributed.
In another embodiment of the present application, the S200 includes S210b.
S210b, controlling the temperature control device to actively heat the torsion wire according to the current temperatures of the first end and the second end of the torsion wire so that the overall temperature of the torsion wire in the length direction tends to be the set temperature.
Specifically, the torsion wire may be heated by both ends simultaneously or by the entire region between the first and second ends.
In this embodiment, the whole temperature of the torsion wire in the length direction tends to the set temperature by actively heating the torsion wire. Through experimental calibration, the set temperature is higher than the temperature indication and is higher than the maximum possible temperature rise of the second end. By adopting the heating mode, the torsion wire is insulated, so that the temperature of the torsion wire is not influenced by a measured thruster and is changed frequently, the ability of restoring the torsion wire to the balance position is maintained, and the measurement accuracy is further improved. And only heating is needed without refrigeration, so that the feasibility is high and the operability is strong.
In an embodiment of the present application, the thermal noise suppression torsion pendulum based micro thrust measurement method further includes the following S400.
S400, calculating the resolution of the torsional pendulum type micro-thrust measuring device based on thermal noise suppression according to the torsional elasticity coefficient of the torsion wire and the minimum resolution of the displacement detecting device.
Specifically, the resolution of the thermal noise suppression-based torsional pendulum type micro-thrust measuring device is the minimum identifiable micro-thrust.
The calculation formula of the resolution of the torsional pendulum type micro-thrust measuring device based on thermal noise suppression is shown as the following formula 2:
2, 2
Wherein,minimum micro-thrust for the torque wire to distinguish, < >>For measuring distance from thruster to torsion wireLeave, go up>For the torsional spring rate of the torsion wire at the current overall temperature t, +.>And b is a compensation value calibrated by experiments for the minimum resolution of the displacement detection device.
In a specific embodiment, the displacement detection device performs differential method to measure angular displacement with minimum resolution ofTorsional spring coefficient of the torsion wire>0.01049 N.m/rad, the distance from the measured thruster to the torsion wire is +.>The compensation value b is taken to be 0 for 318mm, and the calculation carried out in the formula 2 shows that the minimum distinguishable micro-thrust is 0.0095 mu N, so that the angular displacement measurement error can be ignored.
The technical features of the above embodiments may be combined arbitrarily, and the steps of the method are not limited to the execution sequence, so that all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description of the present specification.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.
Claims (8)
1. The utility model provides a based on thermal noise suppression torsion pendulum formula micro thrust measuring device which characterized in that, based on thermal noise suppression torsion pendulum formula micro thrust measuring device includes:
the first end of the torsion wire is fixedly connected with a vibration isolation platform;
the second end of the torsion wire is fixedly connected to the middle part of the balance rod, and one end of the balance rod is used for installing a tested thruster;
the standard force generating device is used for applying standard force opposite to the thrust direction of the tested thruster to the other end of the balance bar;
the displacement detection device is used for detecting the angular displacement of the balance rod relative to the center of the torsion wire;
the first temperature detection device is used for monitoring the temperature of the first end of the torsion wire in real time;
the second temperature detection device is used for monitoring the temperature of the second end of the torsion wire in real time;
the temperature control device is used for actively adjusting the temperature of the torsion wire according to the temperature of the first mild end and the second end of the torsion wire so that the temperature of the torsion wire tends to be uniformly distributed in the length direction;
the standard force generating device, the first temperature detecting device, the second temperature detecting device and the temperature control device are respectively and electrically connected to the control device;
and a temperature control device is arranged at the first end of the torsion wire so as to heat the first end, or the temperature control device is respectively arranged at the first end and the second end of the torsion wire so as to heat the first end and the second end simultaneously.
2. The thermal noise suppression torsional micro-thrust measuring device based on claim 1, wherein the first temperature detection device and the second temperature detection device are patch type temperature sensors.
3. The thermal noise suppression torsional micro-thrust measurement device of claim 1, further comprising:
and the counterweight device is used for balancing deflection in a vertical plane caused by the weight or the installation position of the tested thruster and the standard force generating device so as to enable the balance rod to be horizontal.
4. The thermal noise suppression torsional micro thrust measurement device based on claim 3, wherein the weight device comprises:
the first weight piece is fixedly connected to the balance rod and is positioned between the standard force generating device and the torsion wire;
the second weight piece is fixedly connected to the balance rod and is positioned between the tested thruster and the torsion wire.
5. A thermal noise suppression-based torsion pendulum type micro-thrust measuring method applied to the thermal noise suppression-based torsion pendulum type micro-thrust measuring device according to any one of claims 1 to 4, characterized in that the thermal noise suppression-based torsion pendulum type micro-thrust measuring method comprises:
respectively acquiring the current temperatures of a first end and a second end of the torsion wire in real time;
actively adjusting the temperature of the first end or/and the second end according to the current temperature of the first end and the current temperature of the second end of the torsion wire so that the temperature of the torsion wire tends to be uniformly distributed in the length direction;
calculating the torsional elasticity coefficient of the torsion wire according to formula 1;
K f (t)＝K 0 [1+α k (t-t 0 )]1 (1)
Wherein K is 0 At a wire twisting temperature of t 0 Coefficient of torsional elasticity, alpha k A linear temperature coefficient which is a torsional elastic coefficient; t is the temperature value of the torsion wire when the temperature tends to be uniformly distributed; k (K) f And (t) is the torsional elasticity coefficient of the torsion wire at the current overall temperature of t.
6. The thermal noise suppression based torsion pendulum type micro-thrust measuring method according to claim 5, wherein the actively adjusting the temperature of the first end or/and the second end according to the current temperature of the first end and the current temperature of the second end of the torsion wire so as to make the temperature of the torsion wire tend to be uniformly distributed in the length direction comprises:
and controlling the temperature control device to actively heat the first end of the torsion wire according to the current temperatures of the first end and the second end of the torsion wire so that the overall temperature of the torsion wire in the length direction tends to the current temperature of the second end.
7. The thermal noise suppression based torsion pendulum type micro-thrust measuring method according to claim 5, wherein the actively adjusting the temperature of the first end or/and the second end according to the current temperature of the first end and the current temperature of the second end of the torsion wire so as to make the temperature of the torsion wire tend to be uniformly distributed in the length direction comprises:
and controlling the temperature control device to actively heat the torsion wire according to the current temperatures of the first end and the second end of the torsion wire so that the overall temperature of the torsion wire in the length direction tends to the set temperature.
8. The thermal noise suppression torsional micro-thrust based measurement method of claim 5, further comprising:
calculating the resolution of the torsional pendulum type micro-thrust measuring device based on thermal noise suppression according to the torsional elasticity coefficient of the torsion wire and the minimum resolution of the displacement detecting device;
the calculation formula of the resolution of the torsional pendulum type micro-thrust measuring device based on thermal noise suppression is shown as the following formula 2:
F min L＝K f (t)θ min +b type 2
Wherein F is min The minimum micro-thrust which can be distinguished by the torsion wire is L, the distance between the measured thruster and the torsion wire is K f (t) is the torsional elastic coefficient of the torsion wire at the current overall temperature of t, θ min And b is a compensation value calibrated by experiments for the minimum resolution of the displacement detection device.
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