CN106763413A - A kind of free-piston two-stage buffering stop stop mechanism - Google Patents
A kind of free-piston two-stage buffering stop stop mechanism Download PDFInfo
- Publication number
- CN106763413A CN106763413A CN201611195689.3A CN201611195689A CN106763413A CN 106763413 A CN106763413 A CN 106763413A CN 201611195689 A CN201611195689 A CN 201611195689A CN 106763413 A CN106763413 A CN 106763413A
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- Prior art keywords
- piston
- free
- stop
- ring
- thin
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Classifications
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- 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
- F16F9/0218—Mono-tubular units
-
- 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
-
- 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
- F16F2222/00—Special physical effects, e.g. nature of damping effects
- F16F2222/12—Fluid damping
- F16F2222/126—Fluid damping using gases
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
A kind of free-piston two-stage buffering stop stop mechanism; free-piston is made up of rear end cap, wear ring, piston only, back-up ring, sealing ring and drive end bearing bracket; can realize that piston boost phase drag reduction, decelerating phase increase resistance and sealing function, piston is in integrally curved cavity；Two-stage buffering stop stop mechanism is made up of cushion pad, support ring, sleeve and base, in logical structure in projection.To realize piston soft landing requirement, sleeve, base form annular pneumatic buffer chamber with compression inside pipe wall, when piston enters the fashionable most of kinetic energy that can be realized first-level buffer, absorb piston；Cushion pad forms level 2 buffering, and the remaining kinetic energy of piston is absorbed by the elastic deformation or plastic deformation of material, realizes piston soft landing.The invention overcomes at present the shortcoming that elastic buffering pad present in this kind equipment in the world is fragile, larger to equipment shock loading and cushion pad absorption piston kinetic energy is limited.
Description
Technical field
The present invention relates to the actuation techniques field of high enthalpy shock tunnel, and in particular to in free-piston actuation techniques one
Plant the design of free-piston and buffering stop stop mechanism.
Background technology
FREE-PISTON SHOCK TUNNEL is that, using the high enthalpy shock tunnel of free-piston actuation techniques, such wind-tunnel passes through taskwork
Plug compressor reducer drives the monatomic driving gas of free-piston isentropic Compression, and shock tube operation is driven after the high pressure conditions that reach a high temperature,
Test gas accelerates after shock wave pipe end stagnation by nozzle expansion, realizes the purpose of high speed enthalpy flow simulating high.
Piston movement process is described with reference to Fig. 1：Initial time, piston is in upstream and downstream (upstream high air and down stream low pressure
Drive gas) accelerated by static under the differential pressure action of gas, and start compressible drive gas, cause its pressure constantly to rise
Height, until pressure reaches balance before and after piston, piston speed reaches peak value；Subsequent piston reduces speed now, under effect of inertia, after
Continuous compressible drive gas is until main film opening, finally under the assistance of crash energy absorption equipment, realizes soft landing.The motion of piston
It is the key of free-piston actuation techniques with control, especially soft landing control technology, it is related to driveability and wind-tunnel
The safety of equipment.
The soft landing of piston can be realized by reasonable arrangement initial parameter in theory.However, a large amount of calculate and experiment table
Bright, the parameter sets that theoretical calculation obtains soft landing are very small, only by the suitable Theoretical Design of selection in actual motion
Parameter cannot realize piston soft landing, and generally synthesis many kinds of measures realizes the soft landing of piston.
Several famous in the world at present FREE-PISTON SHOCK TUNNELs all directly clash into elastic endergonic material using free-piston
The mode of material realizes that piston stops and stops that this kind of mode has Railway Project：First, elastic endergonic material is easily damaged, and is often carried out several
Secondary experiment is accomplished by being changed；Second, when piston movement is controlled not at that time, piston directly clashes into elastic suction with high speed
Energy material, passes to the great shock loading of equipment, and influence is produced on equipment safety；3rd, when piston mass is larger, elasticity
Energy-absorbing buffering mode is difficult to fully absorb the remaining kinetic energy of piston.
The content of the invention
The invention aims to overcome at present elastic buffer present in FREE-PISTON SHOCK TUNNEL equipment in the world
Pad is fragile, larger to equipment shock loading and cushion pad absorbs the limited shortcoming of piston kinetic energy.Driven there is provided free-piston
A kind of implementation of dynamic technology.
Technical solution of the invention is：A kind of free-piston two-stage buffering stop stop mechanism, including two-stage buffering stop stops
Mechanism；, in curved cavity, in compression tube cavity, the two-stage buffering stop stop mechanism is in logical knot in projection for motion for the free-piston
Structure, including buffer structure, support ring, sleeve and base；Base is with flange arrangement is led in projection, by base by two-stage
Buffering stop stop mechanism is arranged on compression pipe end, and sleeve is enclosed within the projection of base；Support ring is fixed on the front end of projection to set
Cylinder carries out spacing；Buffer structure is fixed on the front end of support ring；When piston movement is to compression pipe end, two-stage buffering stop is shut down
The curved cavity for protruding out into free-piston of structure, relative can slide between sleeve and the inner cavity surface of free-piston；Freely live
Once delayed by the toroidal cavity formed between free-piston, compressed pipe, two-stage buffering stop stop mechanism in plug motion process
Punching, carries out secondary buffer and stops to stop by being collided with buffer structure.
Also include sealing ring, the motion front-end of free-piston, described sealing ring and drive end bearing bracket are arranged on by drive end bearing bracket
Between mating surface be inclined-plane, the inclined-plane and piston movement direction set passage into 30 ° of -60 ° of angles on drive end bearing bracket, this leads to
Stomatal action is on above-mentioned inclined-plane.
Sealing ring selection compression produces deformation and at least can be resistant to the material of instantaneous 1000K temperature, and described compression is produced
Deformation requirements radially produce at least deformation of 2mm under 3MPa pressure.
The passage pore diameter range is the 1/2~2/3 of the inclined-plane length of side, circumferential uniform quantitative range 8~12.
Circumferentially disposed 4~8 inside diameter ranges are the through hole of 4~8mm on pedestal lobe, by the hole by toroidal cavity
Compressed gas derive, make in toroidal cavity gas pressure stabilization.
Pressure in toroidal cavity is maintained at 4~6 times of scopes of compressed pipe end gas pressure.
Described buffer structure is elastic buffering pad or thin-walled energy-absorbing ring structure, and the energy-absorbing ring is with central through hole
Cylindrical structure, cylindrical structure is divided into three parts, and center section is that the one end in thin-walled, two end portions is used to fix, and the other end will
Impulsive force is transferred to middle thin-walled, and energy-absorbing is carried out by the plastic deformation of thin-walled.
Circumferential uniform induction hole is set on thin-walled, is easy to plastic deformation.
The ratio between the scope 2~5 of described thin-walled length and the ratio between external diameter, thin-walled external diameter and walled thickness scope 30~
100。
Compared with the prior art, the invention has the advantages that：
(1) present invention uses two-stage buffering energy-absorbing mode, and the first order, pneumatic buffer energy-absorbing absorbs piston major part kinetic energy；
The second level, deformation buffer energy-absorbing absorbs piston remaining kinetic energy.When piston movement is to compression pipe end, only stop mechanism and compression
The tubular pneumatic buffer chamber for circularizing, when piston enters cushion chamber, intracavity gas are compressed, and form buffering pneumatic cushion, piston
Kinetic energy be converted into the interior energy of intracavity gas, this is first order buffering；Piston slows down, finally with relatively low speed impacts to two grades
On buffer structure, piston soft landing is realized by the elasticity or plastic deformation of level 2 buffering structure.
(2) circumferential through-hole being disposed with annular pneumatic buffer chamber, beneficial to the gas slowly discharge in pneumatic buffer chamber, protects
Buffering cavity pressure stabilization is held, reduces the possibility of Piston rebound.
(3) level 2 buffering structure is deformation endergonic structure, using elastic deformation endergonic structure or thin wall cylindrical structural plasticity
Deformation endergonic structure.
(4) drive end bearing bracket on free-piston, back-up ring, piston only and rear end cap are metal material, and wear ring material is
High molecular polymer with self-lubricating property, in piston movement, wear ring coordinates with compression inside pipe wall, plays support piston
Effect.Sealing ring material is the high molecular polymer of resistance to TRANSIENT HIGH TEMPERATURE, and being under pressure can occur elastic deformation, realizes sealing；
Meanwhile, the frictional force between sealing ring and compression inside pipe wall increases with the rising of piston downstream pressure, plays brake function.
Wherein, gas is driven to be acted on the inclined-plane of sealing ring by the passage on drive end bearing bracket.
Brief description of the drawings
Fig. 1 is piston movement process schematic.
Fig. 2 is free piston structure figure.
Fig. 3 is two-stage buffering stop stop mechanism structure chart.
Fig. 4 is sealing ring operation principle schematic diagram.
Fig. 5 is pneumatic buffer principle schematic.
Wherein：1- pistons, 2- stops stop mechanism, 3- compressed pipes, 11- rear end caps, 12- wear rings, 13- piston onlies, 14- gears
Circle, 15- sealing rings, 16- drive end bearing brackets, 21- buffer structures, 22- support rings, 23- sleeves, 24- bases.
Specific embodiment
Accompanying drawing discloses the structural representation of a preferred embodiment of the present invention without limitation, below with reference to accompanying drawing
Explain technical scheme.
A kind of free-piston stops stop mechanism design with pneumatic buffer, and as shown in Fig. 2,5, free-piston 1 is in curved cavity, bag
Include rear end cap 11, wear ring 12, piston only 13, back-up ring 14, sealing ring 15 and drive end bearing bracket 16；Rear end cap 11 is solid by screw
It is scheduled on piston only, wear ring 12 is enclosed within piston only 13, the outside dimension of wear ring 12 is more than piston only external diameter, sealing
Ring 15 is enclosed within piston only, and (inclined-plane is at 45 ° with piston movement direction with the tight fit of the inclined-plane of drive end bearing bracket 16 on sealing ring inclined-plane
Angle), drive end bearing bracket 16 is fixed by screws on piston only, and drive end bearing bracket 16 opens 12 passages of a diameter of 12mm, and this leads to
Stomatal action is on above-mentioned inclined-plane.
Above-mentioned sealing ring operation principle：Drive gas by the compression of piston, pressure constantly rises, high-pressure driving gas lead to
The through hole crossed on drive end bearing bracket is applied on the inclined-plane of sealing ring, and pressure is higher, and sealing ring is bigger to the pressure of tube wall, and sealing is got over
Tightly, the frictional force between sealing ring and tube wall is bigger, slows down beneficial to piston.The selection of sealing ring 15 is pressurized and produces deformation and at least can
The material of resistance to instantaneous 1000K temperature, described compression is deformed requiring radially to produce at least change of 2mm under 3MPa pressure
Shape.
Drive end bearing bracket, back-up ring, piston only and rear end cap on free-piston are metal material, wear ring material be with
The high molecular polymer of self-lubricating property, in piston movement, wear ring coordinates with compression inside pipe wall, plays support piston effect.
Sealing ring material is high molecular polymer, and elastic deformation can occur being under pressure, and realizes sealing；Meanwhile, sealing ring with pressure
Frictional force between draw inwall increases with the rising of piston downstream pressure, plays brake function.
For control piston total quality, rear end cap, piston only, back-up ring and drive end bearing bracket are extra super duralumin alloy material；
Wear ring is polytetrafluoroethylene (PTFE) material, with self-lubricating function, plays the anti-drag function of support piston and piston boost phase；
Sealing ring is nilatelong material.
As shown in figure 4, high-pressure driving gas are applied on the inclined-plane of sealing ring by the passage on drive end bearing bracket, pressure is got over
Height, sealing ring is bigger to the pressure of tube wall, seals tighter；Frictional force simultaneously between sealing ring and tube wall is bigger, beneficial to piston
Slow down.
As shown in figure 3, two-stage buffering stop stop mechanism 2 is by cushion pad 21, support ring 22, sleeve 23 and base 24.Sleeve
23 bossings for being enclosed within base 24, the front end that support ring 22 is fixed on projection carries out spacing, the cushion pad 21 to sleeve 23
It is fixed in support ring.
Base, support ring on two-stage buffering stop stop mechanism are metal material, and sleeve is the high score with self-lubricating property
Sub- polymer, cushion pad is softer non-metallic material, by elastic deformation buffering energy-absorbing.Two-stage buffering stop stop device and compression
Pipe forms a pneumatic buffer chamber for annular, and when piston enters cushion chamber, intracavity gas are compressed, and form buffering pneumatic cushion,
The kinetic energy of piston is converted into the interior energy of intracavity gas, and this is buffered for the first order；Piston slows down, and is finally arrived with relatively low speed impacts
On elastic buffering pad, soft landing is realized, this is buffered for the second level.
Specifically, base, support ring material are extra super duralumin alloy；Sleeve material is polyimides；Cushion pad material is silicon
Rubber, is resistant to TRANSIENT HIGH TEMPERATURE, can be by elastic deformation energy-absorbing.
After piston rupture of membranes, still there is larger speed, when its arrival compression pipe end, as shown in figure 5, sleeve, base
And compression inside pipe wall forms annular pneumatic buffer chamber (pressure in toroidal cavity is maintained at the 4 of compressed pipe end gas pressure
~6 times of scopes), first-level buffer is constituted, absorb most of piston kinetic energy；Cushion pad is level 2 buffering, is absorbed by elastic deformation
Remaining piston kinetic energy, realizes piston soft landing.
Through hole is provided with base ring wall surface, through-hole diameter is 5mm, and quantity is 4, it is possible to achieve in pneumatic buffer chamber
Gases at high pressure slowly discharge, and reduce the possibility of Piston rebound.
Above-mentioned cushion pad can also use thin-walled energy-absorbing ring structure, and the energy-absorbing ring is the cylindrical structure with central through hole, circle
Rod structure is divided into three parts, and center section is that the one end in thin-walled, two end portions is used to fix, and be transferred to for impulsive force by the other end
Middle thin-walled, energy-absorbing is carried out by the plastic deformation of thin-walled, and circumferential uniform induction hole is set on thin-walled, is easy to plastic deformation.
The ratio between the scope 2~5 of the ratio between thin-walled length and external diameter, thin-walled external diameter and walled thickness scope is 30~100.
The preferred embodiment of the present invention is illustrated above, but the present invention is not limited to above-described embodiment.It is right
For those skilled in the art, in the category described in claims, it should be apparent that it is conceivable that various modifications
Or fixed case, technology category of the invention is fallen within certainly.
Unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.
Claims (9)
1. a kind of free-piston two-stage buffering stop stop mechanism, it is characterised in that：Including two-stage buffering stop stop mechanism (2)；It is described from
By piston (1) in curved cavity, in compressed pipe (3) inner chamber, the two-stage buffering stop stop mechanism (2) is in logical knot in projection for motion
Structure, including buffer structure (21), support ring (22), sleeve (23) and base (24)；Base (24) is with logical method in projection
Blue structure, by base 24 by two-stage buffering stop stop mechanism (2) installed in compressed pipe (3) end, sleeve (23) is enclosed within base
(24) in projection；Support ring (22) be fixed on projection front end sleeve (23) is carried out it is spacing；Buffer structure (21) is fixed on
The front end of support ring (22)；When piston movement is to compression pipe end, two-stage buffering stop stop mechanism (2) protrudes out into free work
The curved cavity of plug, sleeve (23) relative can be slided and the inner cavity surface of free-piston between；In free-piston (1) motion process
By between free-piston, compressed pipe, two-stage buffering stop stop mechanism (2) formed toroidal cavity once buffered, by with
Buffer structure (21) collision carries out secondary buffer and stops to stop.
2. mechanism according to claim 1, it is characterised in that：Also include sealing ring (15), installed by drive end bearing bracket (16)
Mating surface between the motion front-end of free-piston, described sealing ring and drive end bearing bracket is inclined-plane, the inclined-plane and piston movement
Direction sets passage into 30 ° of -60 ° of angles on drive end bearing bracket, the passage is acted on above-mentioned inclined-plane.
3. mechanism according to claim 2, it is characterised in that：Sealing ring (15) selection is pressurized and produces deformation and at least can
The material of resistance to instantaneous 1000K temperature, described compression is deformed requiring radially to produce at least change of 2mm under 3MPa pressure
Shape.
4. mechanism according to claim 2, it is characterised in that：The passage pore diameter range is the 1/ of the inclined-plane length of side
2~2/3, circumferential uniform quantitative range 8~12.
5. mechanism according to claim 1, it is characterised in that：Circumferentially disposed 4~8 internal diameter models in base (24) projection
The through hole for 4~8mm is enclosed, the compressed gas in toroidal cavity is derived by the hole, makes the gas pressure in toroidal cavity steady
It is fixed.
6. mechanism according to claim 1 or 5, it is characterised in that：Pressure in toroidal cavity is maintained at compression pipe end
4~6 times of scopes of gas pressure.
7. mechanism according to claim 1, it is characterised in that：Described buffer structure (21) is elastic buffering pad or thin
Wall energy-absorbing ring structure, the energy-absorbing ring is the cylindrical structure with central through hole, and cylindrical structure is divided into three parts, and center section is thin
One end in wall, two end portions is used to fix, and impulsive force is transferred to middle thin-walled by the other end, is entered by the plastic deformation of thin-walled
Row energy-absorbing.
8. mechanism according to claim 7, it is characterised in that：Circumferential uniform induction hole is set on thin-walled, is easy to plasticity to become
Shape.
9. the mechanism according to claim 7 or 8, it is characterised in that：The scope 2~5 of the ratio between described thin-walled length and external diameter,
The ratio between thin-walled external diameter and walled thickness scope are 30~100.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611195689.3A CN106763413B (en) | 2016-12-21 | 2016-12-21 | A kind of free-piston two-stage buffering stop stop mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611195689.3A CN106763413B (en) | 2016-12-21 | 2016-12-21 | A kind of free-piston two-stage buffering stop stop mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106763413A true CN106763413A (en) | 2017-05-31 |
| CN106763413B CN106763413B (en) | 2019-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611195689.3A Active CN106763413B (en) | 2016-12-21 | 2016-12-21 | A kind of free-piston two-stage buffering stop stop mechanism |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108036918A (en) * | 2018-01-02 | 2018-05-15 | 中国航天空气动力技术研究院 | The FREE-PISTON SHOCK TUNNEL of one kind of multiple mode operations |
| CN108181078A (en) * | 2017-12-19 | 2018-06-19 | 中国航天空气动力技术研究院 | A kind of piston for gun wind tunnel stops stop device |
| CN108562419A (en) * | 2017-12-19 | 2018-09-21 | 中国航天空气动力技术研究院 | A kind of free-piston buffer gear |
| CN113959673A (en) * | 2021-10-26 | 2022-01-21 | 中国航天空气动力技术研究院 | Shock tunnel and method for electromagnetically stopping heavy piston of shock tunnel |
| CN115155681A (en) * | 2022-06-30 | 2022-10-11 | 天津大学 | Membrane-free shock tube and sampling system |
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| US5115665A (en) * | 1990-02-02 | 1992-05-26 | Fluidyne Engineering Corporation | Free piston shock tube tunnel |
| WO1993001393A1 (en) * | 1991-07-10 | 1993-01-21 | Wbm Pty. Ltd. | Piston motion control in free piston driver |
| US5245868A (en) * | 1990-02-02 | 1993-09-21 | Fluidyne Engineering Corporation | Piston stop for free piston shock tube/tunnel |
| JPH07218380A (en) * | 1994-02-04 | 1995-08-18 | Ishikawajima Harima Heavy Ind Co Ltd | Heavy-piston driving type shock wind-tunnel and control method thereof |
| CN103091065A (en) * | 2013-01-14 | 2013-05-08 | 中国人民解放军总参谋部工程兵科研三所 | Shock wave tunnel for hypersonic air vehicle ground simulation test |
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2016
- 2016-12-21 CN CN201611195689.3A patent/CN106763413B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5115665A (en) * | 1990-02-02 | 1992-05-26 | Fluidyne Engineering Corporation | Free piston shock tube tunnel |
| US5245868A (en) * | 1990-02-02 | 1993-09-21 | Fluidyne Engineering Corporation | Piston stop for free piston shock tube/tunnel |
| WO1993001393A1 (en) * | 1991-07-10 | 1993-01-21 | Wbm Pty. Ltd. | Piston motion control in free piston driver |
| JPH07218380A (en) * | 1994-02-04 | 1995-08-18 | Ishikawajima Harima Heavy Ind Co Ltd | Heavy-piston driving type shock wind-tunnel and control method thereof |
| CN103091065A (en) * | 2013-01-14 | 2013-05-08 | 中国人民解放军总参谋部工程兵科研三所 | Shock wave tunnel for hypersonic air vehicle ground simulation test |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181078A (en) * | 2017-12-19 | 2018-06-19 | 中国航天空气动力技术研究院 | A kind of piston for gun wind tunnel stops stop device |
| CN108562419A (en) * | 2017-12-19 | 2018-09-21 | 中国航天空气动力技术研究院 | A kind of free-piston buffer gear |
| CN108562419B (en) * | 2017-12-19 | 2020-05-12 | 中国航天空气动力技术研究院 | Free piston buffer gear |
| CN108036918A (en) * | 2018-01-02 | 2018-05-15 | 中国航天空气动力技术研究院 | The FREE-PISTON SHOCK TUNNEL of one kind of multiple mode operations |
| CN113959673A (en) * | 2021-10-26 | 2022-01-21 | 中国航天空气动力技术研究院 | Shock tunnel and method for electromagnetically stopping heavy piston of shock tunnel |
| CN115155681A (en) * | 2022-06-30 | 2022-10-11 | 天津大学 | Membrane-free shock tube and sampling system |
| CN115155681B (en) * | 2022-06-30 | 2023-09-05 | 天津大学 | Membraneless Shock Tube and Sampling System |
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| Publication number | Publication date |
|---|---|
| CN106763413B (en) | 2019-01-11 |
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