CN104502235A - Self-closed type oil viscosity online detection sensor and online detection method thereof - Google Patents
Self-closed type oil viscosity online detection sensor and online detection method thereof Download PDFInfo
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Abstract
The invention discloses a self-closed type oil viscosity online detection sensor and an online detection method of the self-closed type oil viscosity online detection sensor. According to the embodiment of the invention, a piezoelectric crystal transducer is adopted to excite a tuning fork resonator to be in a resonance oscillation operating state, the relation of the resonant frequency and the oil viscosity of the tuning fork resonator is detected, and the oil viscosity online detection can be achieved; atemperature sensor is adopted to achieve temperature compensation to the young's modulus of the material along with thetemperature change, and the detection precision of the sensor is improved; a self-closing valve structural design is adopted toachieve quick plugging of a sensor core part under a conditionthat the equipment is at an operating state, the sensor is locked by a flange plate when being inserted into an oil tank or a pipeline, thus, the fork finger direction of the tuning fork resonatorcan be adjusted according to the oil flowing direction and through rotation of the flange plate, the impact of flowing oil to the fork finger can be reduced, the anti-jamming capability of the sensor is improved and the viscosity of the flowing oil can be detected in an online manner.
Description
Technical field
The present invention relates to oil viscosity online measuring technique, particularly relate to the oil viscosity detecting line sensor with self-closing valve structure.
Background technology
When lubricating oil is subject to External Force Acting generation relative movement, motion-impeding resistance can be produced between lubricating oil molecule, this internal friction is called as viscosity, it is one of most important performance index of lubricating oil, the lubricating oil flow that viscosity is larger is poor, but film strength is large, the ability of holding lotus is stronger, the lubricating oil flow that viscosity is less is better, easily flow between the little rubbing surface in gap and ensure lubricant effect, and consume also less at the power overcoming frictional resistance, but under larger load lubricating oil film can thinning so that destroy, make friction surface produce wear and tear.Therefore viscosity is a Main Basis of various selection of mechanical equipment lubricating oil, and viscosity measurement has been widely used in Aeronautics and Astronautics, naval vessel and industrial sector etc. at present.
Viscosity measurements at present both at home and abroad many has capillary viscometer, falling body viscometer, rotational viscosimeter etc.
1, capillary viscometer
Capillary viscometer is the testing tool by hage oiseuillelaw design.Its principle of work is: when fluid to be measured is shunted from process, makes it to flow through that radius is r, length is the tubule of l, and keep its flow q to be certain, by hage oiseuillelaw, the relation between tubule two ends pressure differential deltap P and fluid viscosity coefficient η is as follows:
In formula: γ is fluid density; n
0for the correction factor determined by system.Measure Δ P by above formula to be calculated, just can draw viscosity.
2, falling body viscometer
Object is fallen in a fluid, the fluid that viscosity is high, object falls slower wherein, therefore can compare the size of fluid viscosity from falling speed.Supposing that diameter be the ball of d is move with certain speed v in the fluid of the same substance of η in viscosity, when meeting that speed is very little, ball is the conditions such as rigid ball, having following viscosity calculations formula: η=K (ρ
0-ρ) t
ρ in formula
0for the density of ball, ρ is the density of fluid, and K is definite value, and it is relevant with the pipe diameter D of viscosity meter with the diameter d of ball.So, try to achieve constant with viscosity standard fluid by experimental technique in advance, as long as the lowering time of mensuration certain distance and fluid to be measured density just can ask viscosity.
3. rotational viscosimeter
Rotational viscosimeter as shown in Figure 8.Sample fluid is injected between the coaxial cylinders that two diameters are not identical, and a cylinder is rotated with certain speed, another cylinder will produce the moment be directly proportional to viscosity, if this moment spring is balanced, then angular displacement time thus just can draw viscosity.Be actually driving body and rotary body electromagnetic clutch is isolated, the rotary body spring in fluid supports.Like this, angular displacement is just decided by viscosity.
4. oscillatory viscometer
Oscillatory viscometer measuring principle is that object is when doing twisting vibration in a fluid, owing to being subject to the effect of viscosity moment, object amplitude can be decayed, the degree of decay and the viscosity moment suffered by object have corresponding relation, the energy because viscous damping consumes is provided by the external world, state before making the motion state of object maintain decay, then now the viscosity of fluid has following corresponding relation with the extraneous energy provided:
In formula: η is the viscosity treating fluid measured; ρ is the density treating fluid measured, the energy that E provides for the external world.
As can be seen from above, the kind of viscosity meter is a lot, but some makes difficulty in these viscosity meters, and some requires that test condition is higher, and some measuring error is very large.In a word most of viscosity meter also exist that the test duration is long, measuring error large, cleaning difficulty, even can not direct reading and need the shortcomings such as conversion, do not meet fast and convenient and direct-reading, high-precision requirement.Such as capillary tube technique, because its precision is high, structure comes into one's own simply always.But this viscosity meter is due to its dead-weight structure, and measuring object is confined to Newtonian fluid; And measurement environment is required strict, and need large-scale constant temperature servicing unit, application is confined to the control laboratory of factory more; Its measuring process is manual operations, and process is loaded down with trivial details, also needs to do a large amount of calculation process to the data recorded.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide a kind of can detect the sensor of oil viscosity by real-time online, and it is with self-closing valve structure and temperature compensation function, and the real-time online that can realize oil viscosity detects.According to embodiments of the invention, adopt piezocrystal transducer excitation tuning fork resonator to be in resonant operational state, and detect the relation between the resonance frequency of tuning fork resonator and oil viscosity, thus realize the on-line checkingi to oil viscosity.Adopt temperature sensor to realize the temperature variant temperature compensation of young modulus of material, improve the accuracy of detection of sensor.Adopt self-closing valve structural design, the fast insert-pull that equipment carries out Sensor core device under operating conditions can be realized.Self-closing valve adopts spring and O RunddichtringO to realize the fast insert-pull of core devices, and after core devices is extracted, the valve block of spring push belt O RunddichtringO carries out fast sealing to the mounting hole of core devices on self-closing valve front-end module.Sensor adopts ring flange to lock when inserting fuel tank or pipeline, like this, can according to the flow direction of fluid and the interdigital direction being regulated tuning fork resonator by rotary flange dish, thus reduce fluid flowing to interdigital impact, improve the antijamming capability of sensor, realize the on-line checkingi to flowing oil viscosity.Piezocrystal transducer carries out bending vibration under the effect of material piezoelectric property, tuning fork resonator carries out mechanical oscillation under the excitation of piezocrystal transducer, under adopting self-excited oscillation circuit to make sensor always work in resonance frequency, different oil viscosities is presented as different dampings, thus change the resonance frequency of tuning fork resonator, by the real-time detection of self-excited oscillation circuit realiration to resonance frequency, and adopt calibration algorithm and temperature compensation algorithm to carry out resolving of oil viscosity, and then obtain oil viscosity value.
According to embodiments of the invention, provide a kind of method adopting the sensor to carry out on-line real-time measuremen oil viscosity, the flexural vibrations of piezocrystal transducer are adopted to encourage tuning fork resonator to vibrate, and detect the resonant frequency value of tuning fork resonator in fluid, set up the relation between oil viscosity and resonance frequency, the method resolved by mathematics and temperature compensation algorithm, obtain oil viscosity value.Piezocrystal transducer produces mechanical vibration under the excitation of AC signal, piezocrystal transducer encourages tuning fork resonator to be in vibrational state simultaneously, self-excited oscillation circuit makes whole system be in resonant condition all the time, and export resonance frequency values, when oil viscosity changes, resonance frequency also changes, temperature sensor carries out the real-time detection of oil liquid temperature, and temperature value is sent to signal processing circuit, Signal sampling and processing module carries out the collection of frequency values and the conversion of viscosity number, the impact on tuning fork resonator resonance frequency is varied with temperature by temperature acquisition and temperature compensation algorithm elimination young modulus of material, improve sensor to the accuracy of detection of viscosity.
According to embodiments of the invention, provide a kind of self-closing oil viscosity detecting line sensor, it comprises piezocrystal transducer (13), and the tuning fork resonator (15) to be fixed together with piezocrystal transducer (13), for when tuning fork resonator immerses fluid, piezocrystal transducer excitation is adopted to produce resonance with tuning fork resonator, and the viscosity of fluid is calculated according to the resonance frequency of tuning fork resonator, wherein, described self-closing oil viscosity detecting line sensor has the self-closing valve structure of accommodation tuning fork resonator (15), it comprises self-closing valve terminus module (9) and self-closing valve front-end module (11), in testing process, self-closing valve terminus module (9) and self-closing valve front-end module (11) are locked, wherein, described self-closing valve front-end module (11) there is the oil through (22) for making fluid submergence tuning fork resonator (15).
Beneficial effect of the present invention is mainly: adopt the Cleaning Principle of resonance to be convenient to on-line checkingi, temperature compensation is adopted to improve accuracy of detection, adopting ring flange installation method to solve current sensors adopts screw thread mounting means cannot carry out the problem of orientation adjustment, regulated by orientation and can reduce the interdigital impact of fluid to tuning fork resonator, improve the antijamming capability of sensor, reduce the output noise of sensor, self-closing valve structural design is adopted to improve the installation and removal efficiency of sensor, thus improve the service efficiency of commercial unit, reduce because shutting down the economic loss brought.
Accompanying drawing explanation
Fig. 1 is the metal electrode structure figure of piezocrystal transducer that adopts of self-closing oil viscosity on-line monitoring sensor according to an embodiment of the invention;
Fig. 2 is the vibrational state figure of piezocrystal transducer and tuning fork resonator according to an embodiment of the invention;
Fig. 3 is the schematic diagram of resonant mode oil viscosity detection according to an embodiment of the invention;
Fig. 4 is the formation schematic diagram of self-closing oil viscosity detecting line sensor according to an embodiment of the invention;
Fig. 5 is the self-closing valve structure working principle schematic diagram of self-closing oil viscosity detecting line sensor according to an embodiment of the invention;
Fig. 6 is the schematic diagram of viscosity measurements according to an embodiment of the invention;
Fig. 7 is that the installation position of viscosity sensor according to an embodiment of the invention regulates schematic diagram;
Fig. 8 is the schematic diagram of rotational viscosimeter of the prior art;
Fig. 9 is the mounting structure schematic diagram of the self-closing valve of viscosity sensor according to an embodiment of the invention.
Embodiment
Below, by reference to the accompanying drawings the enforcement of technical scheme is described in further detail.
Although those skilled in the art will appreciate that the following description relates to a lot of ins and outs of embodiment for the present invention, this is only the example for principle of the present invention is described and does not mean that any restriction.The present invention can be applicable to be different from the occasion outside the following ins and outs exemplified, as long as they do not deviate from principle of the present invention and spirit.
In addition, miscellaneous in order to avoid making the description of this instructions be limited to, in description in this manual, the process such as omission, simplification, accommodation may have been carried out to the portion of techniques details that can obtain in prior art data, this is understandable for a person skilled in the art, and this can not affect the open adequacy of this instructions.
First, the general structure of the self-closing oil viscosity detecting line sensor of embodiments of the invention is described with reference to Fig. 4.
Fig. 4 is the formation schematic diagram of self-closing oil viscosity detecting line sensor according to an embodiment of the invention.
As shown in Figure 4, in this self-closing oil viscosity detecting line sensor, by holder 2, method for laser welding is adopted to be assemblied on shell 3 by connector 1, be assemblied on board support frame 6 by screw 5 by circuit board 4, board support frame 6 is with fairlead, and the mode that board support frame 6 is threaded connection is arranged on pedestal 8, adopt thread connecting mode between pedestal 8 and self-closing valve terminus module 9, thus tuning fork resonator is fixed in self-closing valve terminus module 9.Piezocrystal transducer 13 is adhered on tuning fork resonator 15 bottom disc by insulation ebonite, and 3 lead-in wires (being respectively driving voltage signal wire, feedback signal line and ground wire) of piezocrystal transducer 13 are connected with circuit board 4 through the perforate on board support frame 6.
Thermal plastic insulation 7 is poured into the area of space between piezocrystal transducer 13 and board support frame 6, is derived the heat radiation carrying out piezocrystal transducer 13 on the metal pipe-wall of pedestal 8 by the heat produced by piezocrystal transducer 13.
Temperature sensor 14 is the stainless steel metal pipe of built-in Pt1000 platinum resistance of external diameter 4mm internal diameter 3mm, length 30mm, falling heat-transfer glue in pipe, the circular end face place of self-closing valve terminus module 9 has the cylindrical hole that aperture is 4.2mm, the end of temperature sensor 14 inserts 1mm place in cylindrical hole, and adopt laser bonding to carry out sealing and fix, for the detection (carrying out temperature compensation) of oil liquid temperature.
As shown in Figure 4, self-closing valve terminus module 9, in U-shaped, is positioned at self-closing valve block 18 top.Self-closing valve front-end module 11 comprises self-closing valve block 18, the spring 19 of with o O-ring seal 17, self-closing valve front-end module 11 be circumferentially furnished with four oil throughs 22.Self-closing valve terminus module 9 is evenly distributed with three rivets 21, self-closing valve front-end module 11 is evenly distributed with three draw-in grooves 24, self-closing valve terminus module 9 is locked with coordinating of draw-in groove 24 by rivet 21 with self-closing valve front-end module 11, adopts O RunddichtringO 10 to seal.
Ring flange 23 is integrated on self-closing valve front-end module 11, self-closing valve front-end module 11 adopts ring flange 23 to be linked and packed with the ring flange on fuel tank or pipeline, and adopt O RunddichtringO 12 to seal, fluid is by oil through 22 flow sensor, tuning fork resonator is contacted detection that tested fluid carries out oil viscosity, and flow out from oil through 22.Spring 19 is arranged in self-closing valve front-end module 11, and one end is fixed on end cap 20, and the other end abuts self-closing valve block 18.
Fig. 1 is the metal electrode structure figure of piezocrystal transducer 13 that adopts of oil viscosity on-line monitoring sensor according to an embodiment of the invention.
As shown in Figure 1, piezocrystal transducer adopts PZT piezoelectric ceramics as piezoelectric, utilize the piezoelectric effect of piezoelectric to drive and detect the oscillating characteristic of tuning fork resonator, there are three electrodes and corresponding lead-in wire in piezocrystal transducer surface, and described three electrodes are direct piezo electric effect detecting electrode, inverse piezoelectric effect exciting electrode and ground-electrode respectively.Due to the inverse piezoelectric effect of material, piezoelectric is the vibration of generator tool under the excitation of combined-voltage signal, thus drives tuning fork resonator generation mechanical vibration, and at resonant frequency point, piezocrystal transducer has maximum output voltage.The direct piezo electric effect of piezocrystal transducer is utilized to detect the oscillating characteristic of tuning fork resonator.
Fig. 2 is the vibrational state figure of piezocrystal transducer 13 and tuning fork resonator 15 according to an embodiment of the invention.
As shown in Figure 2, piezocrystal transducer adopts insulation ebonite to be bonded on the bottom disc of tuning fork resonator, can improve the transmission efficiency of vibrational energy.As shown in the solid line of the tuning fork in Fig. 2 and the contrast of dotted line, piezocrystal transducer bends vibration, drive tuning fork resonator vibrates, and different oil viscosities has different damping effects to tuning fork resonator, thus causes the oscillating characteristic of tuning fork resonator different.Tuning fork resonator can adopt stainless steel material, to improve the adaptability of sensor to fluid environment.
Fig. 3 is the schematic diagram of resonant mode oil viscosity detection according to an embodiment of the invention.
As shown in Figure 3, by measuring the resonant frequency value of tuning fork resonator, resolve oil viscosity value by following formula,
Wherein, f
0for the aerial resonant frequency value of tuning fork resonator, f
1for the resonant frequency value of tuning fork resonator in tested fluid, w, t are respectively interdigital width and the thickness of tuning fork resonator, ρ
mfor the density of tuning fork resonator material, ρ
lfor the density of fluid, ω
lfor the angular frequency of tuning fork resonator in fluid.
Fig. 5 is the self-closing valve structure working principle schematic diagram of self-closing oil viscosity detecting line sensor according to an embodiment of the invention.Fig. 9 is the mounting structure schematic diagram of the self-closing valve of viscosity sensor according to an embodiment of the invention.
As shown in figs. 5 and 9, self-closing valve structure is mainly used in the fast insert-pull of Sensor core device in industry spot, and the sealing of fluid is mainly realized by the seesawing of self-closing valve block 18 of with o O-ring seal 17.At the closure state of self-closing valve, under the promotion of the elastic force of spring 19, self-closing valve block 18 and O RunddichtringO 17 realize the sealing to fluid, in the open loop situations of self-closing valve, self-closing valve terminus module 9 promotes self-closing valve block 18 and travels forward () in figure downwards under the effect of external force, now fluid is by oil through 22 submergence tuning fork resonator 15, and flow out from the oil through 22 on opposite, oil through 22 is for being of a size of the rectangular opening of 21*18mm, centerline hole is 44mm apart from the distance of end cap 20, fluid sealing is carried out by O RunddichtringO 10, now rivet 21 sticks into line slip along the bending guide rail of draw-in groove 24 and is stuck on draw-in groove 24 under the effect of the reverse push power of spring 19, be locked, end cap 16 is playing guide effect in closed procedure, improve self-closing speed.
Fig. 6 is the schematic diagram of viscosity measurements according to an embodiment of the invention.As shown in Figure 6, the piezoelectric effect of piezocrystal transducer is utilized to encourage tuning fork resonator work and detect the feedback signal of tuning fork resonator under different viscosities, the detection that temperature sensor carries out oil liquid temperature trip temperature of going forward side by side compensates, improve accuracy of detection and resolution, self-excited oscillation circuit is excitation and the frequency detection circuit of piezocrystal transducer, and signal processing circuit carries out resolving of viscosity and output digit signals.
Fig. 7 is that the installation position of viscosity sensor according to an embodiment of the invention regulates schematic diagram.As shown in Figure 7, viscosity sensor adopts vibration detection principle to carry out the detection of oil viscosity, and the sensitive element of viscosity sensor is a tuning fork probe, pops one's head in form by a pair flat is interdigital; Fluid flowing impulse force easily has an impact to sensor, in order to reduce noise, in sensor installation process, avoid fluid to the impact of tuning fork, therefore need to reduce fluid impact area as far as possible, in the design of sensor, adopt ring flange mounting means can avoid the problem in the uncontrollable direction of conventional threads mounting means, as long as after the flange on sensor ring flange and pipeline and the relation between installation pipeline are determined, can know tuning fork probe interdigital in pipeline towards, be easy to control installation position.As shown in Figure 7, desirable installation effect is that the interdigital side of tuning fork resonator 15 as shown by the solid line in the drawings flows to parallel orientation with fluid, namely, make the interdigital cross-sectional area on fluid flow direction of tuning fork resonator 15 minimum, thus the impact that the flowing of fluid produces the resonance of tuning fork resonator 15 minimum (like this, the resonant condition of tuning fork resonator 15 is only determined by oil viscosity substantially).As mentioned above, flange hole can be increased by the flange on fuel tank or pipeline, and regulate installation position by rotary flange dish 23.
In sum, those skilled in the art will appreciate that and can make various amendment, modification and replacement to the above embodiment of the present invention, it all falls into the protection scope of the present invention as claims limit.
Claims (10)
1. a self-closing oil viscosity detecting line sensor, it tuning fork resonator (15) comprising piezocrystal transducer (13) and be fixed together with piezocrystal transducer (13), for when tuning fork resonator (15) immerses fluid, piezocrystal transducer (13) excitation is adopted to produce resonance with tuning fork resonator (15), and the viscosity of fluid is calculated according to the resonance frequency of tuning fork resonator (15)
Wherein, described self-closing oil viscosity detecting line sensor has the self-closing valve structure of accommodation tuning fork resonator (15), and it comprises self-closing valve terminus module (9) and self-closing valve front-end module (11),
In testing process, self-closing valve terminus module (9) and self-closing valve front-end module (11) are locked,
Wherein, described self-closing valve front-end module (11) there is the oil through (22) for making fluid submergence tuning fork resonator (15).
2. self-closing oil viscosity detecting line sensor according to claim 1, wherein, self-closing valve front-end module (11) comprises self-closing valve block (18), spring (19), the end cap (20) of with o O-ring seal (17), self-closing valve terminus module (9) is in U-shaped, be positioned at self-closing valve block (18) top, the bottom of self-closing valve terminus module (9) abuts self-closing valve block (18)
Wherein, one end of spring (19) is fixed on end cap (20), and the other end abuts self-closing valve block (18).
3. self-closing oil viscosity detecting line sensor according to claim 1, wherein, piezocrystal transducer (13) is adhered on the bottom disc of tuning fork resonator (15) by insulation ebonite, tuning fork resonator (15) is threaded connection mode and immerses in fluid through self-closing valve terminus module (9), adopts thread connecting mode to be connected between pedestal (8) with self-closing valve terminus module (9).
4. self-closing oil viscosity detecting line sensor according to claim 3, also comprise connector (1), holder (2), shell (3), circuit board (4), screw (5), board support frame (6)
Wherein, method for laser welding is adopted to be assemblied on shell (3) by connector (1) via holder (2), by screw (5), circuit board (4) is assemblied on board support frame (6), board support frame (6) is with fairlead, and the mode that board support frame (6) is threaded connection is arranged on pedestal (8).
5. self-closing oil viscosity detecting line sensor according to claim 2, wherein, between non-detection period, described self-closing valve structure is in closure state, spring (19) is by elastic force upwardly self-closing valve block (18) and O RunddichtringO (17), realize the sealing to fluid
In testing process, described self-closing valve structure is in open loop situations, self-closing valve terminus module (9) promotes self-closing valve block (18) downwards under the effect of external force, fluid is by oil through (22) the submergence tuning fork resonator (15) of side, and flow out from the oil through (22) of opposite side, fluid sealing is carried out by O RunddichtringO (10), now rivet (21) sticks into line slip along the bending guide rail of draw-in groove (24), and under the effect of the reacting force upwards of spring (19), be stuck on draw-in groove (24), self-closing valve terminus module (9) and self-closing valve front-end module (11) are locked.
6. self-closing oil viscosity detecting line sensor according to claim 1, also comprises temperature sensor (14),
Wherein, the circular end face place of self-closing valve terminus module (9) has cylindrical hole, and the end of temperature sensor (14) inserts in cylindrical hole, and adopts laser bonding to carry out sealing and fix, for the detection of oil liquid temperature, to carry out temperature compensation.
7. self-closing oil viscosity detecting line sensor according to claim 2, also comprise sensor ring flange (23), it is integrated on self-closing valve front-end module (11), and sensor ring flange (23) is the square flange with multiple screw mounting hole
Sensor ring flange (23) is connected with the fixed flange with multiple screw mounting hole held on the fuel tank of fluid or pipeline, adopt screw sensor ring flange (23) and the fixed flange on fuel tank or pipeline to be locked, and adopt O RunddichtringO (12) to seal the gap between sensor ring flange (23) and fixed flange.
8. self-closing oil viscosity detecting line sensor according to claim 1, wherein, described piezocrystal transducer (13) adopts PZT piezoelectric ceramics as piezoelectric, utilize the inverse piezoelectric effect of piezoelectric to drive tuning fork resonator to vibrate and to detect the resonance characteristic of tuning fork resonator
Wherein, there are three electrodes and corresponding lead-in wire in piezocrystal transducer (13) surface, and described three electrodes are direct piezo electric effect detecting electrode, inverse piezoelectric effect exciting electrode and ground-electrode respectively.
9. self-closing oil viscosity detecting line sensor according to claim 7, wherein, the interdigital lateral plane of tuning fork resonator (15) is parallel with flowing to of fluid, and interdigital axis is vertical with the flow direction of fluid.
10. adopt a method of carrying out on-line real-time measuremen oil viscosity according to the self-closing oil viscosity detecting line sensor described in claim 1 to 9, comprise the following steps:
By alternating voltage, excitation piezocrystal transducer (13) vibration, drives excitation tuning fork resonator (15) vibration, makes tuning fork resonator always work in tuning-points place by self-excited oscillation circuit;
Measure tuning fork resonator (15) resonant frequency value under different viscosities;
According to following formula, calculate oil viscosity value:
Wherein, f
0for tuning fork resonator (15) aerial resonant frequency value, f
1for tuning fork resonator (15) resonant frequency value in fluid, w, t are respectively interdigital width and the thickness of tuning fork resonator (15), ρ
mfor the density of tuning fork resonator (15) material, ρ
lfor the density of fluid, ω
lfor tuning fork resonator (15) angular frequency in fluid, η is the viscosity number of fluid.
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| CN105403485A (en) * | 2015-11-30 | 2016-03-16 | 合肥工业大学 | Portable high-precision liquid viscosity measuring probe |
| CN106153531A (en) * | 2016-08-25 | 2016-11-23 | 中国工程物理研究院总体工程研究所 | Liquid material vibration damping based on cantilever beam response, shock isolation performance test device |
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| CN106338451A (en) * | 2016-11-08 | 2017-01-18 | 深圳市英力监测技术有限公司 | Device for online detection of oil product density and viscosity |
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| WO2022121319A1 (en) * | 2020-12-11 | 2022-06-16 | 大连理工大学 | Piezoelectric ceramic sensor-based apparatus and method for monitoring viscosity of fluid in viscous damper |
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