CN109827704A - Minute yardstick pinking thrust-measuring device based on the method for dangling - Google Patents
Minute yardstick pinking thrust-measuring device based on the method for dangling Download PDFInfo
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Abstract
The present invention devises a kind of minute yardstick pinking thrust-measuring device based on the method for dangling, including wobble component, the platform assembly that dangles, fixed device, detonation tube, measuring system and ignition system.The integral level degree for the system of dangling is adjusted in the device using adjusting nut, system resistance can be reduced to by minimum level using the ceramic bearing of low friction resistance simultaneously, furthermore non-contact measurement and control are used, the thrust of minute yardstick pinking can more accurately be measured, and pass through the swing curve for the platform that dangles under measurement no-load condition, the data that the later period obtains can be also modified, be further reduced measurement error.The present apparatus solve at present dangle system friction resistance it is larger, it is non-horizontal swing and detonation tube power supply and measurement route bring resistance it is larger the problems such as, can be used for the fields such as pinking propulsion, pinking experiment and the thrust measurement of microdriver.
Description
Technical field
The present invention relates to the thrust measurement fields of minute yardstick pinking, and the minute yardstick pinking thrust specially based on the method for dangling is surveyed
Measure device.
Background technique
Minute yardstick pinking typically refers in equivalent diameter be the pinking that carries out in several burners to several millimeters of zero point, it and
Power source based on chemical cell is compared, and has the characteristics that environmental pollution is small and energy density is high.Also, pinking is different from
The burning of general minute yardstick, it can be in moment generation high speed, the combustion wave of high temperature and high pressure, and structure is simple, does not rotate
Component theoretically meets the requirement of small size, lightweight required for oligodynamic device and high-energy density.Therefore, use is micro-
Scale detonating combustion provides power with more wide Research Prospects for midget plant.Currently, due to conventional thrust measurement
Device is mainly used for large scale burner, and the measurement error generated is smaller on measurement result influence, and minute yardstick pinking generates
Thrust it is relatively small, if measured with conventional equipment, measurement error will greatly influence measurement result, or even can flood
No thrust, so, there is an urgent need to a kind of high-precision minute yardstick pinking thrust-measuring devices.
Currently, the main method for pinking thrust measurement has the direct method of measurement and two kinds of the indirect method of measurement.Directly measure
Method is exactly directly to measure the thrust of detonation engine using sensor on Test Rig, and engine is passed through roller bearings
Engine is limited in radial movement on testboard bay, and with another group of rolling bearing, send out it can only axially movable
Generated thrust is transmitted on piezoelectric force transducer by power transmission mandril when motivation work, so that it may obtain impulse force
Then instantaneous thrust waveform versus time in certain time is integrated, and is averaged and can be obtained by engine by time domain waveform
Average thrust value under certain operating condition, but for minute yardstick pinking, due to the frictional resistance of Test Rig upper bearing (metal),
The measurement error of the frictional resistance and Test Rig itself of piezoelectric force transducer itself can cause biggish shadow to measurement result
It rings, therefore the direct method of measurement is not suitable for the thrust measurement of minute yardstick pinking.
The indirect method of measurement be by measuring relevant to motor power physical parameter such as angle, displacement and torque etc., then
The size of thrust is found out by formula.Common indirect measurement system has a day parallel type structure, rocks type structure and the type structure that dangles,
Wherein especially with the principle for the type structure that dangles the simplest, easy to accomplish, measurement accuracy it is high and can by change pendulum arm length come
Sensitivity is adjusted, therefore has obtained extensive research.But for the existing type thrust-measuring device that dangles, test macro
There are still some shortcomings.For example, the device that dangles Kiyanda designed when studying the momentum that pulse detonation tube generates,
Device itself is heavier, and dangles and be also connected with power supply circuit and feeder between system and outside, these all greatly increase
The resistance to dangle when moving is added, so that the measurement accuracy of system is affected, in addition, working as using filament or steel wire as swing rope
When, the levelness to dangle is difficult to adjust, and then can not accurately measure the center of gravity for the device that dangles, and causes biggish measurement error
(Kiyanda C B,Tanguay V,Higgins A J,et al.Effect of Transient Gasdynamic
Processes on the Impulse of Pulse Detonation Engines[J].Journal of
Propulsion&Power,2002,18(5):1124-1126.)。
Therefore, it is difficult to adjust for the device levelness that solves to dangle, the power supply of detonation tube and measurement route resistance are larger, measurement
A series of problems, such as mechanical friction of system is larger, the present invention devise a kind of minute yardstick pinking thrust measurement based on the method for dangling
Device.
Summary of the invention
Technical problems to be solved
Currently, applying the type thrust-measuring device that dangles on pinking field, the pinking pipe size of measurement is larger (usually
Internal diameter is greater than 10cm, and pipe range is greater than 1m), at this point, the frictional resistance of itself that dangles, the influence of non-horizontal swing and detonation tube
Power supply and influence of the measurement route bring resistance to pinking thrust measurement it is smaller, still, apply it to minute yardstick pinking
When thrust measurement, these problems will bring greater impact the thrust measurement of detonation tube, or even make measurement result deviation 50%
More than.Therefore, in order to overcome the shortcomings of the existing measuring technique that dangles, it is quick-fried that the present invention devises a kind of minute yardstick based on the method for dangling
Shake thrust-measuring device, by the ceramic bearing of low friction resistance, the special platform that dangles, high-precision displacement sensor and
The devices such as high-speed camera, can greatly reduce the influence of the above problem, to realize the height to minute yardstick pinking thrust
Precision measure, while the position of fire point and detonation mode in detonation tube can also be probed into.The present apparatus can be applied to pinking and push away
Into the fields such as, pinking experiment and the thrust measurement of microdriver.
The technical solution of the present invention is as follows:
Minute yardstick pinking thrust-measuring device based on the method for dangling, including wobble component, the platform assembly that dangles, fixed dress
Set, detonation tube 9, measuring system and ignition system, it is characterised in that: wobble component, dangle platform assembly and fixed device it is common
The system of dangling is constituted, and can easily can adjust the integral level degree for the system of dangling by adjusting nut 15；Igniting
System is installed in the igniter seat 13 for 11 lower section of platform of dangling, and blending bolt is fixed, and by remote control, may be implemented to quick-fried
The igniting of mixed gas in pipe 9 is shaken, influence of the conducting wire to dangling is eliminated；Measuring system then relies on non-contact measurement, passes through position
Displacement sensor 18 issues and receives laser, to realize the measurement to device horizontal displacement of dangling, in addition uses high-speed camera 19
Gas igniting and communication process in detonation tube are shot, is conducive to analyze fire point and detonation mode.
The wobble component by four carbon fiber bars, 14, eight low friction resistances ceramic bearing 17 and eight bearing blocks 16
Composition, ceramic bearing 17 is installed in bearing block 16, and is fixed with circlip, wherein ceramic bearing 17 is the weight of this system
In it is weight, according to design requirement, frictional resistance should be selected smaller and with certain load ability ceramic bearing 17, subtract as far as possible
Few measurement error.Then 14 one end of carbon fiber bar is inserted into the preformed hole of bearing block 16, by the adjusting nut of outer wall of hole
15 fix and adjust depth of the carbon fiber bar 14 in hole, so that the connection of 14 one end of carbon fiber bar is completed, it is then another to its
End and other carbon fiber bars also carry out identical operation, are finally mounted on wobble component and dangle on platform 11, and finely tune adjusting
Nut 15, the device that makes to dangle integrally reach horizontal, eliminate the influence of non-horizontal swing.
It is described dangle platform assembly by integration dangle platform 11, detonation tube fixed block, reflection platform 5 and bearing axis 1 form,
Its rapidoprint is aviation aluminium, can reduce the weight of device in this way.Wherein, the platform 11 that dangles is the knot of a cuboid
Structure is machined with four groups of boss being parallel to each other 10, for installing wobble component above it；And it is provided on its each face pre-
It boxes out, for installing level meter, detonation tube fixed block, reflection platform 5 and ignition system etc..When installation, first in the platform 11 that dangles
Four boss 10 on corresponding wobble component is installed, and fixed with bearing axis 1 and nut, then will reflection platform 5 it is fixed
It is mounted on igniter seat 13 onto the side wall for dangling platform, then by ignition system, finally by detonation tube 9 and its upper and lower fixed block
It installs.
The fixed device is similar with the integrated platform 11 that dangles, and difference is only having four circular through holes thereon, is used for
Expansion bolt is installed, and is fixed in roof, then wobble component is installed on it.
The detonation tube 9 is the transparent straight pipe of an inner wall smooth, and detachable igniter head 2 is equipped in its front end, is used
In air inlet and igniting.When installation, detonation tube is placed on two lower fixed blocks 3, then places upper fixed block 8, blending bolt
It is fixed, installation is completed, while the fixed block of corresponding size can be selected according to the outer diameter of detonation tube, to meet requirement of experiment.
The measuring system is made of high-speed camera 19 and displacement sensor 18, and wherein high-speed camera 19 is for clapping
Take the photograph the detonation and communication process of mixed gas in detonation tube 9；Displacement sensor 18 is used to measure the horizontal displacement for the platform 11 that dangles,
And the thrust of detonation tube generation is calculated in turn.It is advantageous in that using both instruments are maximum, contactless survey may be implemented
Amount, avoids the resistance of outside line from impacting the system of dangling.
The ignition system is divided into controller and igniter, and wherein igniter, which is mounted on, dangles on platform 11, passes through
Spark discharge is lighted a fire to realize；Controller is then used for remote control, can be realized igniting triggering synchronous with measuring device.It is logical
Untouched control is crossed, the detonation of gas gas is mixed in Lai Shixian detonation tube, the frictional resistance of system can also be reduced in this way.
Beneficial effect
Using minute yardstick pinking thrust-measuring device provided by the invention, minute yardstick pinking can be relatively accurately measured
Thrust.The present invention uses carbon fiber bar as wobble component for the first time, and adjusts the levelness that dangles using adjusting nut, solves
The levelness that previous rope yarn formula dangles is difficult to the problem of adjusting；The ceramic bearing of low friction resistance is used simultaneously as rotation dress
It sets, can dramatically reduce the resistance to dangle when swinging, and can use displacement sensor and go out to dangle in zero load
In the case of the curve that freely swings, itself the damped coefficient of dangling can be gone out according to the equation of motion reverse that dangles, and then can be to survey
The thrust measured is corrected；In addition, measuring system and ignition system are all made of not with the mode directly contacted that dangles, carry out
Measurement and control igniting, avoid outside line influence caused by measurement accuracy of dangling；Minute yardstick pinking of the present invention, i.e. equivalent
It is especially suitable that detonation tube of the diameter between several to several millimeters of zero point carries out thrust measurement, and the platform space that dangles is larger, more
It is relatively simple to change detonation tube, conventional efficient can be greatlyd improve, saves experimental period.
Detailed description of the invention
Fig. 1 is that the whole assembling schematic diagram of thrust-measuring device of the present invention (is installed and do not include measuring device and point in part
Fiery system).
Fig. 2 dangles platform assembly figure (bottom view) for thrust-measuring device of the present invention.
Fig. 3 is the overall schematic of thrust-measuring device wobble component of the present invention.
Fig. 4 is the whole measurement structure schematic diagram of thrust-measuring device of the present invention.
In figure, lower 4 ignition lead of fixed block outlet, the 5 reflection 6 loss of weight square hole of platform of 1 bearing axis, 2 detonation tube igniter head 3
9 detonation tube 10 of the fixed block boss 11 that dangles dangles 12 igniter fixation hole of platform, 13 igniter seat on 7 level meter seats 8
14 carbon fiber bar, 15 adjusting nut, 16 bearing block, 17 ceramic bearing, 18 laser displacement sensor, 19 high-speed camera
20 ignition leads.
Specific embodiment
Below in conjunction with attached drawing to the present invention is based on the minute yardstick pinking thrust-measuring device for the method for dangling work is further detailed
Explanation.Thrust measurement is carried out to minute yardstick detonation tube, can be sequentially included the following steps:
14 one end of carbon fiber bar is inserted into the preformed hole of bearing block 16, by hole by step 1, the installation of wobble component
The adjusting nut 15 of outer wall is fixed and adjusts depth of the carbon fiber bar 14 in hole, to complete the company of 14 one end of carbon fiber bar
It connects, identical operation is also then carried out to its other end and other carbon fiber bars 14, ceramic bearing 17 is then placed in bearing
In seat 16, and fixed with circlip.
Fixed device is installed on roof, and is fixed with swell fixture by step 2.Then by four groups of wobble components according to
It is secondary to be installed on the boss 10 of fixed device by bearing axis 1, and bearing axis 1 is secured with nuts.
Step 3, installation detonation tube 9 then will be under two first according to the corresponding fixed block of the choice of diameter of detonation tube 9
Fixed block 3, which is mounted on, to dangle on platform 11, and places the side thereon of detonation tube 9, then install fixed block 8, finally solid with bolt
It is fixed, complete the installation of detonation tube 9.
Step 4 installs ignition system, first powers off ignition system, be then placed on igniter and dangle under platform 11
On the igniter seat 13 of side, and igniter is fixed with nut, ignition lead 20 is finally passed from below through into ignition lead outlet 4, and
It is connected with detonation tube igniter head 2, can is that the dangle detonation tube 9 of the top of platform 11 is powered.
Reflection platform 5 and level meter are installed on and are dangled on platform 11, be then sequentially connected four wobble components by step 5
To dangling on platform 11, level meter is observed in real time, and correspondingly finely tunes adjusting nut 15, so that the system that dangles integrally reaches water
It is flat.
Step 6 installs high-speed camera 19, high-speed camera 19 is connected with computer first, and is carried out with related software
Then image parameter setting adjusts height and the direction of tripod, so that detonation tube 9 is exactly in the center of image, most
After focus, until 9 inner cavity of detonation tube can be clearly seen.
Step 7 installs laser displacement sensor 18, and the single beam laser vertical irradiation for emitting it is in the platform 11 that dangles
It reflects on platform 5, then adjusts the horizontal distance between sensor 18 and the platform 11 that dangles, so that dangling platform during exercise neither
It can strike on displacement sensor 18, and can be moved in the range of sensor 18.
Step 8, opening air charging system is that detonation tube 9 fills mixed gas, is then turned on each measuring system and ignition system.
After the completion of inflation, removes air charging system and start to measure and light a fire, at this time high-speed camera when the platform 11 that dangles is totally stationary
19 will shoot gas initiation process in detonation tube, and displacement sensor 18 then records the related data for 11 oscillatory process of platform that dangles,
To carry out correlation analysis, according to calculating, the whole measurement error of the device is less than 1%.
Step 9 closes each measuring instrument, and dismantles the measuring device that dangles, and then seals bearing 17 with plastic film,
To prevent from entering dust in bearing ball, so that the experimentation of minute yardstick pinking thrust measurement is completed, finally according to measurement
Data carry out correlation analysis and calculating.
A specific embodiment of the invention is described in detail in conjunction with attached drawing and specific implementation process above, but this hair
Bright to be not limited to the above embodiment, those skilled in the art without departing from the principles of the invention, can be to above-mentioned
Method makes various changes and optimization.
Claims (9)
1. the minute yardstick pinking thrust-measuring device based on the method for dangling, including wobble component, the platform assembly that dangles, fixed device,
Detonation tube, measuring system and ignition system, it is characterised in that: wobble component dangles platform assembly and fixed device collectively forms
The system that dangles, and can easily can adjust the integral level degree for the system of dangling by adjusting nut；Ignition system peace
Below the platform that dangles, blending bolt is fixed, and by remote control, the igniting to mixed gas in detonation tube may be implemented,
Eliminate influence of the conducting wire to dangling；Measuring system then relies on contactless measurement, and laser is issued and received by displacement sensor,
Realizing the measurement to device horizontal displacement of dangling, in addition shooting gas igniting in detonation tube using high-speed camera and being propagated through
Journey is conducive to analyze fire point and detonation mode.
2. the minute yardstick pinking thrust-measuring device according to claim 1 based on the method for dangling, it is characterised in that swing group
Part is made of four carbon fiber bars, the ceramic bearing of eight low friction resistances and eight bearing blocks, wherein using carbon fiber bar generation
For traditional rope yarn, can abundant carbon fiber bar rigid advantage, lighter weight, and shape will not occur during the swing
Become, it is possible to reduce thrust loss；And it can be fixed by the adjusting nut on bearing block and adjust carbon fiber bar in preformed hole
Interior depth, the device that makes to dangle integrally reach horizontal, eliminate the influence of non-horizontal swing.
3. the minute yardstick pinking thrust-measuring device according to claim 2 based on the method for dangling, it is characterised in that bearing block
Shape is spliced by cuboid and semicylinder, and carbon fiber bar preformed hole is provided in cuboid, for placing carbon fiber bar,
Outer wall two sides are provided with threaded hole, are used for installation and adjustment nut；Bearing hole is provided in semicylinder, the property with general bearing block
Matter can place circlip with fixing bearing.
4. the minute yardstick pinking thrust-measuring device according to claim 2 based on the method for dangling, it is characterised in that use eight
The ceramic bearing of a low friction resistance, the bearing friction coefficient is smaller, and has certain load-bearing capacity.
5. the minute yardstick pinking thrust-measuring device according to claim 1 based on the method for dangling, it is characterised in that dangle flat
Platform component by integration dangle platform, detonation tube fixed block, reflection platform and bearing axis form, rapidoprint is aviation aluminium,
Reflection platform is used to receive and the signal of specular displacement sensor, to complete the measurement of displacement；Bearing axis is a cylindrical stage
Rank axis, side are whittled into square, and for being fixed on boss, other side vehicle is with screw thread, and for installing fixture nut, centre is used for
Bearing is placed, and by circlip and the fixed position of step.
6. the minute yardstick pinking thrust-measuring device according to claim 5 based on the method for dangling, it is characterised in that integration
The platform that dangles is the structure of a cuboid, is machined with four groups of boss being parallel to each other above it, for installing wobble component,
Every group of boss is made of two boss again, one of them is provided with cylindrical hole, another is provided with half square semi-circular hole, is used
It cooperates in bearing axis；And different preformed holes is provided on each face of platform, it is solid for installing level meter, detonation tube
Determine block, reflection platform and ignition system etc..
7. the minute yardstick pinking thrust-measuring device according to claim 1 based on the method for dangling, it is characterised in that detonation tube
It is fixed by the fixed block up and down for the platform that dangles, and the fixation of corresponding size can be selected according to the outer diameter of detonation tube
Block, to meet requirement of experiment.
8. the minute yardstick pinking thrust-measuring device according to claim 1 based on the method for dangling, it is characterised in that measurement system
System is made of high-speed camera and displacement sensor, wherein detonation of the high-speed camera to shoot mixed gas in detonation tube
And communication process；Horizontal displacement of the displacement sensor to measure the platform that dangles, and the thrust of detonation tube generation is calculated in turn；
The system realizes synchro measure displacement and observation flow field, and by contactless measurement, getting rid of the system of dangling need not
The constraint wanted, avoids thrust loss.
9. the minute yardstick pinking thrust-measuring device according to claim 1 based on the method for dangling, it is characterised in that igniting system
System is divided into controller and igniter, and wherein igniter, which is mounted on, dangles on platform, and igniting is realized by spark discharge；
Controller is then used for remote control, is capable of the triggering of exactly simultaneous control igniting and measuring device；Pass through contactless type control
It makes, the detonation of gas gas is mixed in Lai Shixian detonation tube, the frictional resistance of system can also be reduced in this way.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910151375.0A CN109827704B (en) | 2019-02-28 | 2019-02-28 | Microscale detonation thrust measuring device based on suspension oscillation method |
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| CN201910151375.0A CN109827704B (en) | 2019-02-28 | 2019-02-28 | Microscale detonation thrust measuring device based on suspension oscillation method |
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| CN109827704B (en) | 2020-08-25 |
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