KR101732151B1 - Liquid level measuring device in microgravity condition with a Gas-spring system - Google Patents

Liquid level measuring device in microgravity condition with a Gas-spring system Download PDF

Info

Publication number
KR101732151B1
KR101732151B1 KR1020150165004A KR20150165004A KR101732151B1 KR 101732151 B1 KR101732151 B1 KR 101732151B1 KR 1020150165004 A KR1020150165004 A KR 1020150165004A KR 20150165004 A KR20150165004 A KR 20150165004A KR 101732151 B1 KR101732151 B1 KR 101732151B1
Authority
KR
South Korea
Prior art keywords
liquid
measuring
piston
excitation
gas
Prior art date
Application number
KR1020150165004A
Other languages
Korean (ko)
Inventor
정상권
서만수
Original Assignee
한국과학기술원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 한국과학기술원 filed Critical 한국과학기술원
Priority to KR1020150165004A priority Critical patent/KR101732151B1/en
Application granted granted Critical
Publication of KR101732151B1 publication Critical patent/KR101732151B1/en

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F22/00—Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02K—JET-PROPULSION PLANTS
    • F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
    • F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
    • F02K9/60—Constructional parts; Details not otherwise provided for
    • F02K9/605—Reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • F16F9/0209—Telescopic
    • F16F9/0281—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fluid Mechanics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

The present invention provides a device to measure liquid level under a low gravity condition using a gas spring system having a reservoir containing a liquid propellant and a wood pipe portion connected with an excitation system provided in a form of an integrated sealed liquid storage container to accurately measure a remaining amount of liquid in a liquid storage container regardless of whether or not the liquid propellant is in contact with an excitation unit by increasing inertia of the excitation unit unlike the Helmholtz resonance method. The excitation system is a piston type coupled and equipped with an exciter to apply displacement vibration in an electric excitation frequency.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a gas-

The present invention relates to an apparatus for measuring a liquid level under a low gravity environment and, more particularly, to a system for measuring a remaining liquid level in a liquid storage container regardless of whether the liquid propellant is in contact with an exciter, The present invention relates to an apparatus for measuring a liquid level under a low gravity environment using a gas spring system capable of accurately measuring a liquid level of a liquid.

Under low gravity conditions in space, the surface tension of the liquid is dominated by gravity (a situation where the B 0 number is less than one).

Figure 112015114751830-pat00001

Thus, unlike in the gravity state, the interface of the liquid propellant used in the space launch vehicle becomes irregular such that it is located along the inner wall surface of the tank due to the action of the surface tension.

Therefore, it is not possible to measure the residual amount of liquid propellant used in space launch vehicle with the conventional liquid quantity measurement method, and therefore, a liquid residual amount measurement method considering a special environment of low gravity is needed.

The technique for measuring the residual amount of the liquid propellant in the tank under low gravity, that is, the conventional technology according to this necessity, includes the measurement method using the gas state equation (PV = nRT: Boil-Charles's Law) And the like are widely known.

According to Boyle-Charles's law, the residual measurement accuracy of the liquid propellant depends on the variables used in the gas state equation PV = nRT, ie, how accurate the gas volume (V), pressure (P) and temperature (T) . That is, theoretically, all of the gas in the tank must be dissolved in the liquid. However, since the gas can not escape out of the tank together with the liquid in practice, there is a problem that the error gradually increases as time elapses from the initial state It is holding. As a result, in the case of the liquid propellant residual amount measurement method using the Boyle-Charles's law, there is an error between the amount of liquid calculated at a certain time and the actual amount, so that the difference between the amount of liquid measured through long- It is necessary to judge whether it changes or not.

On the other hand, the heating method is effective when the amount of liquid in the vicinity of the heater is small, but when the amount of liquid in the vicinity of the heater is large, the difference in the rate of temperature rise of the liquid is insignificant, . In addition, since the heating method raises the temperature at a specific position, there is a problem that the temperature-sensitive liquid can not be frequently measured.

In addition, in the case of the liquid-fuel-related residual amount measuring method obtained by the Boille-Charles's law and the heating method in parallel, the problem of each technique as described above can not be compensated or canceled because it is not solved And furthermore, the remaining amount of the obtained liquid propellant is indirectly calculated. Therefore, there is a demand for a technique capable of measuring the remaining amount of liquid propellant in a space launch vehicle with higher accuracy.

For example, a technique such as a fluid level measurement method using the Helmholtz resonance method can be mentioned. The fluid balance measurement using the Helmholtz resonance method has a characteristic frequency that varies depending on the density of the gas in the space and the volume of the space, The size of the internal space, that is, the volume is determined.

That is, the fluid level measurement method using the Helmholtz resonance method utilizes the characteristic that the mass of the gas in the ullage volume of the storage container containing the fluid such as the liquid propellant behaves like a spring like an elastic body.

As shown in FIG. 1, the apparatus for measuring residual fluid using the Helmholtz resonance method includes a storage container 3 composed of a space part 1 in which a fluid is present and a neck tube 2 for Helmholtz resonance, A loudspeaker (4) for generating a swept frequency is connected to the storage container (3).

When the predetermined frequency is generated in the storage container 3 in the amplifying device 4, the storage container 3 can receive an acoustic response signal of a specific Helmholtz frequency through a function like a Helmholtz resonator, response signal.

At this time, the acoustic response signal may be directly measured through a predetermined microphone 5, or may be obtained through a pattern such as a method of measuring the impedance of the amplifying device 4. [

Figure 112015114751830-pat00002

Figure 112015114751830-pat00003

Figure 112015114751830-pat00004

However, all of the devices using the Helmholtz resonance method are subject to restrictions that the liquid must not reach the signal generator, that is, the condenser microphone 4 or the predetermined microphone 5 for measuring the acoustic response. When a predetermined liquid is applied to the magnifying device 4 or the microphone 5, it is impossible to measure the acoustic frequency due to the mass of the liquid.

Therefore, in order to apply the Helmholtz resonance method to a liquid level measuring apparatus, a device capable of stabilizing the behavior of the liquid in a predetermined pattern in a storage container, that is, a wire mesh for liquid stabilizer using a mesh or the like Further solutions are needed for additional technical configurations such as liquid acquisition devices.

Particularly, in the case of a space launch vehicle in which the interface of the liquid propellant under low gravity is inevitably irregular, it is possible to accurately measure the remaining amount of the liquid propellant by measuring the acoustic reaction frequency irrespective of the behavior of the liquid, Becomes indispensable.

Disclosure of Invention Technical Problem [8] The present invention has been made in view of the above problems of the prior art, and it is an object of the present invention to provide a liquid propellant which can accurately measure the remaining amount of a liquid propellant, The present invention is to provide an apparatus for measuring the liquid level under a low gravity environment using a gas spring system.

Further, the present invention has a mechanical principle characteristic of a simple structure, so that it is excellent in reliability and stability while being easy to make and approach, and is suitable for measuring the remaining liquid amount of a space launch vehicle, etc., For example.

In addition, the objects of the present invention will become more apparent from the following description of the technical structure and the organic operation of each other.

In the apparatus for measuring the liquid level under a low gravity environment using the gas spring system proposed by the present invention, a wooden pipe to which a system for storing a liquid propellant and a system associated with the system are provided in the form of an integral, sealed liquid reservoir.

Particularly, the excitation system is characterized by being in the form of a piston provided with an exciter for applying a displacement vibration at an electric excitation frequency.

The piston may be resiliently supported in a neck of the liquid storage container by a bellows-type support spring, or may be provided with a tangential spring having a predetermined modulus of elasticity ( K m ) between the piston and the vibrator. Can be implemented

Wherein the piston includes an acceleration meter for measuring a transfer function of a vibration system and a displacement meter for measuring a magnitude variation of vibration, wherein the liquid storage container includes a pressure meter for measuring internal pressure and temperature and a temperature meter And can be variously carried out.

Here, the temperature measuring device may be provided in the liquid storage container in plurality.

According to the apparatus for measuring the liquid level under a low gravity environment using the gas spring system according to the embodiment of the present invention, unlike the conventional Helmholtz measurement system using the resonance frequency, by increasing the inertia of the exciter, A technical effect is obtained in which the remaining amount in the liquid storage container can be accurately measured irrespective of contact or contact.

Particularly, according to the apparatus for measuring the liquid level under a low gravity environment using the gas spring system according to the embodiment of the present invention, it is applied in the form of a piston combined with a vibrator applying a predetermined displacement vibration at a frequency having an excitation system, Since it has the operating characteristics of mechanical principle, it is easy to manufacture and access to users, and exhibits technological effects such as excellent reliability and stability.

Further, the apparatus for measuring the liquid level under a low gravity environment using the gas spring system according to the embodiment of the present invention is characterized in that the known system mass M , the measured transfer function TF , the relaxation time tau , to obtain a frequency (v) the elastic modulus (K tot) of the entire system from, and finally to pinpoint the remaining amount in the liquid storage vessel by a method to obtain a gas volume (v) to calculate the elastic coefficient of the gas (K gas) Therefore, it is possible to prevent unnecessary waste of energy due to errors in estimating the remaining amount of the liquid propellant and the like.

FIG. 1 is a conceptual diagram schematically showing an apparatus for measuring residual liquid amount according to a conventional Helmholtz resonance method.
FIG. 2 is a conceptual diagram showing an apparatus for measuring residual liquid amount under a low gravity environment using a gas spring system according to a first embodiment of the present invention.
FIG. 3 is a conceptual diagram showing an apparatus for measuring residual liquid amount under a low gravity environment using a gas spring system according to a second embodiment of the present invention.
4 is a graph showing a measurement result of a transfer function of a vibration system in an apparatus for measuring residual liquid amount under a low gravity environment using a gas spring system according to an embodiment of the present invention.
FIG. 5 is a graph showing a measurement result of a relaxation time through measurement of a change in vibration magnitude in a liquid level measuring apparatus under a low gravity environment using a gas spring system according to an embodiment of the present invention.

First, the reference numerals in the drawings according to the embodiments of the present invention are divided according to their degree of relevance so that the relevance between the components can be easily grasped. Number was applied.

In addition, when the terms such as the first or the second are used, it is found that there is no purpose other than the purpose of distinguishing one component from another.

Although the terminology used herein has been described in terms of a specific embodiment only in order to facilitate understanding of the apparatus for measuring the liquid level under a low gravity environment using the gas spring system according to the present invention, It is not intended to be. It is to be understood that the singular < RTI ID = 0.0 > expression < / RTI > includes plural representations unless the context clearly dictates otherwise.

It is also to be understood that terms such as "comprise" or "comprising" are intended to specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, , Steps, operations, elements, parts, or combinations thereof, without departing from the spirit and scope of the invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the technical constitution of a liquid level measuring apparatus under a low gravity environment using a gas spring system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, although the apparatus for measuring the liquid level under a low gravity environment using the gas spring system according to the embodiment of the present invention is not specifically shown and described in detail in the following description, drawings and the like, And a predetermined process for controlling and controlling a series of operations according to the mathematical formulas and the like listed in the description of the present invention, Let's keep it in mind to understand the following explanations.

The apparatus for measuring the liquid level under a low gravity environment using the gas spring system according to the embodiment of the present invention includes a storage part 11 for storing a liquid propellant and a wood part 12 are provided in the form of an integral hermetically sealed liquid storage container 10.

The excitation system 20 is in the form of a piston 22 coupled with an exciter 21 which applies a predetermined displacement oscillation to an excited excitation frequency. At this time, the mass M of the piston 22 of the excitation system 20 is specified.

The liquid storage vessel 10 including a predetermined gas therein is configured to have a volume V of the vessel and an internal pressure P and a head cross sectional area A of the piston 22 and a gas phase water ratio? May be regarded as a predetermined gas-spring system.

Therefore, since the system has a predetermined gas elastic modulus ( K gas ), and the item of gravitational acceleration (g) can be removed under a low gravity environment such as an outer space, the gas elastic modulus ( K gas ) 5 can be simplified.

Figure 112015114751830-pat00005

Here, the vibrator 21 is a type for supplying displacement vibration to an arbitrary frequency to the piston 22, and may be various types such as a piezo electric transducer capable of generating a predetermined vibration by electricity .

The vibrating system 20 according to the embodiment of the present invention may have a configuration in which the elastic modulus K m of the vibrating system 20 is determined and calculated between the vibrator 21 and the piston 22, That is, it can be implemented in a form including a tangential spring 23 of a known elastic modulus ( K m ).

The piston 22 may further include a predetermined support spring 22a as shown in FIG. 3, and the piston 22 may be elastically supported inside the neck part 12 of the liquid storage container 10 .

The piston 22 suspended from the inner side of the wood pipe portion 12 of the liquid storage container 10 by the support spring 22a, that is, the inner end of the inlet of the wood pipe portion 12, It is possible to realize the technical features such as realizing the complete airtightness between the gas portion of the piston 11 and the connecting portion of the piston 22 and improving the performance of the exciter system 20 from the elasticity of the support spring 22a do.

At this time, the support spring 22a may be of various types such as a coil type or a bellows type. However, it is preferable that in view of the stable support and impact on performance, such as modulus of elasticity (K m), the precision of the system 20 with said back of said piston (22), adopting a bellows type than the coil type, applied .

More specifically, the bellows-type support spring 22a supports the piston 22 much more stably, thereby minimizing the gap between the inner peripheral surface of the woodpipe portion 12 of the liquid storage container 10 and the piston 22 And the airtightness of the liquid storage container 10 is secured.

The piston 22 may be provided in a form including a predetermined acceleration measuring instrument 22b or a displacement measuring instrument 22c.

The acceleration sensor 22b measures the transfer function of the vibration system by the excitation system 20 as shown in FIG. 4. The acceleration sensor 22b may adopt a shape such as a force sensor or an acceleration sensor.

In the displacement measuring instrument 22c, as shown in FIG. 5, the oscillation amplitude of the vibration system corresponding to the damping coefficient of the vibrating system 20, that is, the piston 22, is measured. Here, the relaxation time ? By the excitation system 20 is also measured.

At this time, the displacement gauge 22c is provided on the piston 22 and the other is located inside the entrance of the wooden pipe 12 of the liquid storage container 10 so as to face each other It is necessary to be constructed so as to be able to measure a change in the magnitude of vibration of the piston 22. [

In other words, according to the apparatus for measuring the liquid level under a low gravity environment using the excitation system according to the embodiment of the present invention, the mass M of the excitation system 20, the measured transfer function TF , ( K tot ) of the vibrating system 20 from the vibration frequency ( τ ) and the vibration frequency ( v ), finally calculating the elastic modulus ( K gas ) of the corresponding gas, The volume V is obtained.

That is, when the piston 22 of the excitation system 20 is excited at a specific excitation frequency ( v ) through the shaker 21, which can give an arbitrary frequency and displacement vibration to the electric furnace, The displacement measuring unit 22b measures a transfer function ( TF ) of the vibration system, and the displacement measuring unit 22c measures the vibration amplitude and the relaxation time.

Figure 112015114751830-pat00006

Figure 112015114751830-pat00007

Then, the total modulus of elasticity ( K tot ) of the excitation system 20 is obtained as shown in Equation (8) below. At this time, since the elastic coefficient (K m) of the system 20 with the above is already known it is possible to finally calculate the gas modulus (K gas) into.

Figure 112015114751830-pat00008

The liquid storage container 10 includes a pressure meter 13 and a temperature meter 14 for measuring internal pressure and temperature. At this time, the pressure gauge 13 may be provided outside the liquid storage vessel 10, while the temperature gauge 14 may be provided in the form of a measurement sensor provided on the inner wall of the liquid storage vessel 10 have.

In particular, in the case of the temperature measuring device 14, it is preferable that the temperature measuring device 14 is provided in a plurality of locations on the inner wall surface of the liquid storage container 10 for more accurate temperature measurement.

According to the apparatus for measuring the liquid remaining amount under a low gravity environment using the excitation system according to the embodiment of the present invention, the gas elasticity coefficient K gas , the pressure P u obtained through the pressure gauge 13, It is possible to calculate the gas volume V u from Equation (5) and the heat capacity ratio ( ? ) Obtained from the temperature measuring devices (14)

Figure 112015114751830-pat00009

Therefore, the apparatus for measuring the liquid level under a low gravity environment using the excitation system according to the embodiment of the present invention is capable of measuring the liquid level of the liquid reservoir 10 by increasing the predetermined liquid level by removing the gas volume V u from the entire volume of the liquid storage vessel 10 It becomes possible to calculate it with accuracy.

10: Liquid storage container 11: Storage part 12: Wooden part
13: Pressure meter 14: Temperature meter 20: Excitation system
21: vibrator 22: piston 22a: support spring
22b: acceleration measuring instrument 22c: displacement measuring instrument 23:

Claims (7)

Wherein a wood pipe to which a system with a reservoir for containing liquid propellant is connected is provided in the form of a hermetically sealed liquid reservoir formed integrally,
The excitation system is in the form of a piston provided with an exciter for applying a displacement vibration to an electric excitation frequency,
Wherein the piston is resiliently supported in a neck portion of the liquid storage container by a bellows-type support spring, and includes an acceleration meter for measuring a transfer function of the vibration system and a displacement meter for measuring a magnitude of vibration,
Wherein the liquid storage vessel includes a pressure gauge and a temperature gauge for internal pressure and temperature measurement,
Wherein the exciter is a piezo electric transducer that generates an electric furnace vibration to apply a frequency-dependent displacement vibration to the piston. delete The method according to claim 1,
Wherein the excitation system comprises a torsion spring for excitation between the exciter and the piston. ≪ RTI ID = 0.0 > 8. < / RTI > delete delete The method according to claim 1,
Wherein the plurality of temperature measuring devices are provided in the liquid storage container. delete
KR1020150165004A 2015-11-24 2015-11-24 Liquid level measuring device in microgravity condition with a Gas-spring system KR101732151B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150165004A KR101732151B1 (en) 2015-11-24 2015-11-24 Liquid level measuring device in microgravity condition with a Gas-spring system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150165004A KR101732151B1 (en) 2015-11-24 2015-11-24 Liquid level measuring device in microgravity condition with a Gas-spring system

Publications (1)

Publication Number Publication Date
KR101732151B1 true KR101732151B1 (en) 2017-05-02

Family

ID=58742684

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150165004A KR101732151B1 (en) 2015-11-24 2015-11-24 Liquid level measuring device in microgravity condition with a Gas-spring system

Country Status (1)

Country Link
KR (1) KR101732151B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111636980A (en) * 2020-05-15 2020-09-08 大连理工大学 Bellows type storage tank for liquid propellant
CN113358898A (en) * 2021-03-31 2021-09-07 深圳九星印刷包装集团有限公司 Collision indicating device
CN114324332A (en) * 2021-12-27 2022-04-12 中国科学院力学研究所 Space fluid management test device in microgravity-variable force environment

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002291093A (en) * 2001-03-23 2002-10-04 National Institute Of Advanced Industrial & Technology Superconducting loud speaker and in-tank liquid quantity measurement device
JP2014081269A (en) * 2012-10-16 2014-05-08 Seiko Epson Corp Pressure measuring device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002291093A (en) * 2001-03-23 2002-10-04 National Institute Of Advanced Industrial & Technology Superconducting loud speaker and in-tank liquid quantity measurement device
JP2014081269A (en) * 2012-10-16 2014-05-08 Seiko Epson Corp Pressure measuring device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111636980A (en) * 2020-05-15 2020-09-08 大连理工大学 Bellows type storage tank for liquid propellant
CN111636980B (en) * 2020-05-15 2021-06-18 大连理工大学 Bellows type storage tank for liquid propellant
CN113358898A (en) * 2021-03-31 2021-09-07 深圳九星印刷包装集团有限公司 Collision indicating device
CN114324332A (en) * 2021-12-27 2022-04-12 中国科学院力学研究所 Space fluid management test device in microgravity-variable force environment

Similar Documents

Publication Publication Date Title
JP5603412B2 (en) Heterogeneous fluid density measuring device
US5043912A (en) Apparatus for measuring the level of the interface between a first and a second medium in a reservoir
CA2700851C (en) Noninvasive fluid density and viscosity measurement
US3596510A (en) Resonant infrasonic gauging apparatus
KR101732151B1 (en) Liquid level measuring device in microgravity condition with a Gas-spring system
CN104236664B (en) Multi-limit level measuring device
JP6034370B2 (en) Medium separation device, particularly hydraulic accumulator, including associated measuring instrument and measuring method
NO334153B1 (en) Down-hole densitometer
RU2619829C1 (en) Test of sensing element for vibration meter
EP2614353B1 (en) Fluid properties measurement device having a symmetric resonator
RU2511629C2 (en) Method and device for pressure measurement with use of filling pipe
WO2019078839A1 (en) Replaceable print apparatus components
US10209170B2 (en) Meter electronics and method for obtaining flow fluid viscosity at a reference temperature
US10139328B2 (en) Apparatus for gauging liquid or solid mass contained in a vessel and method for using same
EP1744142A1 (en) Apparatus and method for measuring fluid density
US20070017277A1 (en) Apparatus and method for measuring fluid density
US20160341644A1 (en) Measuring instrument for determining the density of fluids
CN107389794B (en) Method and system for measuring rock attenuation coefficient
JPS5915837A (en) Viscosity measuring apparatus for high temperature fluid
RU169441U1 (en) VIBRATION DEVICE FOR DETERMINING ENVIRONMENTAL PARAMETERS
RU2346259C2 (en) Vibration probe for determination of density of fluid mediums
Wisniewiski Second generation shock tube calibration system
JP2014081269A (en) Pressure measuring device
RU2488125C1 (en) Hydrostatic accelerometer
RU151456U1 (en) VIBRATION DENSITY SENSOR (OPTIONS)

Legal Events

Date Code Title Description
E701 Decision to grant or registration of patent right
GRNT Written decision to grant