CN109406044A - A kind of undercarriage buffer air pressure detection method - Google Patents
A kind of undercarriage buffer air pressure detection method Download PDFInfo
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- CN109406044A CN109406044A CN201811346544.8A CN201811346544A CN109406044A CN 109406044 A CN109406044 A CN 109406044A CN 201811346544 A CN201811346544 A CN 201811346544A CN 109406044 A CN109406044 A CN 109406044A
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- buffer
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- air cavity
- outer cylinder
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L17/00—Devices or apparatus for measuring tyre pressure or the pressure in other inflated bodies
Abstract
The application belongs to Airplane detection technical field, in particular to a kind of undercarriage air pressure detection method, this method comprises: obtaining P, P is buffer air cavity pressure；T is obtained, T is Kelvin in buffer air cavity；X0 is obtained according to P and T, when X0 is that buffer is in standard inflation state, piston rod stretches out the theoretical length of its outer cylinder；X is obtained, X is that the piston rod projection buffer of buffer stretches out the physical length of outer cylinder；Judged to obtain the inflated condition of buffer according to the characteristic parameter of X0, X and the buffer.It is convenient, effective this method avoid in the prior art, being jacked up aircraft using hydraulic jack, it is limited by environmental factor small, can avoid potential risk in the prior art.
Description
Technical field
The application belongs to Airplane detection technical field, in particular to a kind of undercarriage air pressure detection method.
Background technique
Undercarriage is the important component of aircraft, is mainly used for absorbing the shock of aircraft in aircraft landing or take-off process
Load, core component are buffer.Currently, buffer mostly uses oil-gas type structure, and structure is as shown in Figure 2, comprising: outer cylinder
1；Piston rod 2, one end is arranged inside outer cylinder 1, in sealing contact with 1 inner wall of outer cylinder, surrounds oil pocket between outer cylinder 1, another
One end is connect with undercarriage wheel；Piston rod 2 can be axially moved along outer cylinder 1, and it is cavity that it is internal；And floating piston
3, it is arranged in cavity inside, and in sealing contact with cavity inner wall, so that cavity is divided into two sections, wherein one section is known as buffering
Chamber, another section is known as air cavity；Cushion chamber and oil pocket are connected to close to oil pocket, and with oil pocket by damping hole；Floating piston 3 can be
In cavity axially movable；Hydraulic oil, filling gas in air cavity are filled in oil pocket.
For aircraft in landing or take-off process, undercarriage wheel bears bump stroke, pushes the cylinder axially outward of piston rod 3
The movement of 1 direction squeezes oil chamber volume, and the hydraulic oil in oil pocket enters cushion chamber by damping hole, and then floating piston 3 is pushed to carry on the back
It is moved to outer cylinder 1, squeezes air cavity, compress the gas in it.Wherein, bump stroke a part that undercarriage wheel is born is hydraulic
It is consumed when oil stream is into damping hole, another part is stored in the gas in air cavity.
It to guarantee to take off and the safety of landing mission, needs to carry out periodic maintenance to undercarriage, wherein be related to pair
The detection of gas pressure in undercarriage buffer, in this regard, the scheme that those skilled in the art generally use is, first by aircraft liquid
Jack stand is pressed, keeps undercarriage wheel liftoff, thereafter using the gas pressure in gauge measurement undercarriage buffer, judgement
Measure whether obtained pressure value meets regulation, judgement obtains the inflated condition of buffer.The program has the following deficiencies:
1) aircraft is jacked up using hydraulic jack, it is time-consuming and laborious；
2) under certain specific conditions, using hydraulic jack stand aircraft difficulty and there may be risks, such as
On carrier-borne face, the operation is carried out, since naval vessel is often in the state of rocking, the difficulty for jacking up aircraft and risk is made to increase
Add.
Thus, it is desirable to have a kind of technical solution overcomes or at least mitigates at least one drawbacks described above of the prior art.
Summary of the invention
The purpose of the application is to provide a kind of undercarriage buffer air pressure detection method, to overcome or alleviated by above-mentioned at least one
The defect of aspect.
The technical solution of the application is:
A kind of undercarriage buffer air pressure detection method, comprising:
P is obtained, P is buffer air cavity pressure；
T is obtained, T is Kelvin in buffer air cavity；
X0 is obtained according to the characteristic parameter of P, T and buffer, when X0 is that buffer is in standard inflation state, piston rod
Stretch out the theoretical length of its outer cylinder；
X is obtained, X is that the piston rod projection buffer of buffer stretches out the physical length of outer cylinder；
Judged to obtain the inflated condition of buffer according to X0 and X.
Optionally, X0 is obtained according to P and T, including being calculated according to the functional relation of P and T and X0.
Optionally, characteristic parameter includes N, L1, D1, D2 and VLiquid；
Functional relation is theory function relational expression:
P=NRT/ (π D1*D1*L1+ π D2*D2* (L1-X0))/4-VLiquid)；
Wherein,
N is under standard inflation state, the amount of the gaseous matter in buffer air cavity for buffer；
R is ideal gas constant；
L1 is the length of buffering piston bar；
D1 is the diameter of buffering piston bar；
D2 is the diameter of buffer outer cylinder；
VLiquid, it is volume of the buffer filled with hydraulic oil.
Optionally, functional relation is one in multiple fitting function relational expressions；
Multiple fitting function relational expressions, comprising: P=f (X0)i,i=1,2,3 ... ... n；
P=f (X0)iBy TiWhen reference data be fitted to obtain；
TiWhen reference data pass through TiWhen benchmarks obtain, TiWhen benchmarks filled in buffer in standard
Gaseity, and Kelvin carries out under conditions of being Ti in buffer air cavity.
Optionally, functional relation is P=f (X0)kWherein, | TK-T|≤|Ti- T |, i=1,2,3 ... ... n.
Optionally, X0 is obtained according to P and T, obtains X0 including one by consulting multiple pressure and stretching out in relational graph；
Multiple pressure and stretching relational graph, comprising: (P~X0)iRelational graph, i=1,2,3 ... ... n；Wherein,
(P~X0)iP~X0 relational graph that reference data when relational graph is according to Ti is drawn；Reference data when Ti is logical
Benchmarks when crossing Ti obtain, TiWhen benchmarks be in standard inflation state in buffer, and opened in buffer air cavity
Family name's temperature is TiUnder conditions of carry out.
Optionally, X0 is obtained according to P and T, to pass through access (P~X0)kRelational graph obtains X0, wherein | Tk-T|≤|Ti-
T |, i=1,2,3 ... ... n.
Optionally, TiWhen benchmarks data, comprising: (Pij, X0ij), j=1,2,3 ... m；TiWhen benchmarks,
Include:
Measuring process: axially buffer rotating cylinder is pushed to move along buffer rotating cylinder, obtains a benchmark of buffer
State measures P, X0 under the normal condition；
Recording step: duplicate measurements step m times；
The P that step obtains, which is measured, by the q times is recorded as Piq, the X0 that step obtains, which is measured, by the q times is recorded as
X0iq, q=1,2,3 ... m；To obtain benchmarks data (P when Tiij, X0ij), j=1,2,3 ... m.
Optionally, judged to obtain the inflated condition of buffer according to X0 and X, comprising:
Step 1: judgement | X0-X | it whether is more than reservation threshold；
Step 2: if | X0-X | it is less than reservation threshold, obtaining the inflated condition that buffer fills is that the blowing pressure is normal.
Optionally, in step 2, if | X0-X | it is more than reservation threshold, judges whether X0 is greater than X；
If X0 is greater than X, obtaining buffer inflated condition is that the blowing pressure is relatively low；
Otherwise, then obtaining buffer inflated condition is that the blowing pressure is higher.
At least there are following advantageous effects in the application: a kind of undercarriage buffer air pressure detection method is provided, it should
Method is based on can be directly by the obtained data X of measurement and can be by data X0 that the data directly measured obtain to slow
The inflated condition for rushing device judged, this method avoid in the prior art, aircraft is jacked up using hydraulic jack,
It is convenient, effective, it is limited by environmental factor small, can avoid potential risk in the prior art.
Detailed description of the invention
Fig. 1 is undercarriage partial structural diagram；
Fig. 2 is the cross-sectional view of a-quadrant in Fig. 1；
Fig. 3 is the application undercarriage air pressure detection method flow diagram；
Fig. 4 is the flow diagram that the inflated condition of buffer is judged in the application undercarriage air pressure detection method；
Fig. 5 is the relational graph that air pressure P and desired overhang X0 are detected in one embodiment of the application.
Wherein:
1- outer cylinder；2- piston rod；3- floating piston；
The length of L1- piston rod；D1- diameter of piston rod；X1- air cavity along piston rod to length；X2- cushion chamber is along living
The length of stopper rod axial direction；
The length of L2- outer cylinder；The diameter of D2- outer cylinder；Length of the Y1- oil pocket along outer cylinder axial direction；Y2- piston rod is located at inner cylinder
Inner part is along axial length；
X- measurement obtains the length that piston rod stretches out outer cylinder.
Specific embodiment
To keep the purposes, technical schemes and advantages of the application implementation clearer, below in conjunction in the embodiment of the present application
Attached drawing, technical solutions in the embodiments of the present application is further described in more detail.In the accompanying drawings, identical from beginning to end or class
As label indicate same or similar element or element with the same or similar functions.Described embodiment is the application
A part of the embodiment, instead of all the embodiments.The embodiments described below with reference to the accompanying drawings are exemplary, it is intended to use
In explanation the application, and it should not be understood as the limitation to the application.Based on the embodiment in the application, ordinary skill people
Member's every other embodiment obtained without creative efforts, shall fall in the protection scope of this application.Under
Face is described in detail embodiments herein in conjunction with attached drawing.
In the description of the present application, it is to be understood that term " center ", " longitudinal direction ", " transverse direction ", "front", "rear",
The orientation or positional relationship of the instructions such as "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is based on attached drawing institute
The orientation or positional relationship shown is merely for convenience of description the application and simplifies description, rather than the dress of indication or suggestion meaning
It sets or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as protecting the application
The limitation of range.
1 to Fig. 5 the application is described in further details with reference to the accompanying drawing.
A kind of undercarriage buffer air pressure detection method, comprising:
P is obtained, P is buffer air cavity pressure；
T is obtained, T is Kelvin in buffer air cavity；
X0 is obtained according to the characteristic parameter of P, T and buffer, when X0 is that buffer is in standard inflation state, piston rod
Stretch out the theoretical length of its outer cylinder；
X is obtained, X is that the piston rod projection buffer of buffer stretches out the physical length of outer cylinder；
Judged to obtain the inflated condition of buffer according to X0 and X.
Above-mentioned P, T, X can be obtained by mode measured directly.
Further, X0 is obtained according to P and T, including being calculated according to the functional relation of P and T and X0.
Further, the characteristic parameter of buffer includes: N, L1, D1, D2 and VLiquid；
Functional relation is theory function relational expression:
P=NRT/ (π D1*D1*L1+ π D2*D2* (L1-X0))/4-VLiquid)；Wherein,
N is under standard inflation state, the amount of the gaseous matter in buffer air cavity for buffer；R is perfect gas
Constant；L1 is the length of buffering piston bar；D1 is the diameter of buffering piston bar；D2 is the diameter of buffer outer cylinder；
VLiquid, it is volume of the buffer filled with hydraulic oil.
Theory function relational expression disclosed above is that have Incoercibility based on the volume for filling hydraulic oil in buffer
And the equation of gas state of engineer application can be met and obtained, process is described below:
V=VIt is empty-VIt is slow
=π D1*D1*L1/4- (VLiquid-VOil)
=π D1*D1*L1/4-VLiquid+VOil
=π D1*D1*L1/4-VLiquid+πD2*D2*Y1/4
=π D1*D1*L1/4-VLiquid+πD2*D2*(L2-Y2)/4
=π D1*D1*L1/4-VLiquid+πD2*D2*(L1-X0)/4
=(π D1*D1*L1+ π D2*D2* (L1-X0))/4-VLiquid；
PV=NRT；
P=NRT/V
=NRT/ (π D1*D1*L1+ π D2*D2* (L1-X0))/4-VLiquid), wherein
V is the air cavity volume of the buffer；
N is under standard inflation state, the amount of the gaseous matter in the buffer air cavity for the buffer；
R is ideal gas constant；
VIt is empty, it is the volume of 2 internal cavity of buffering piston bar；
VIt is slow, it is the volume of the buffer cushion chamber；
VLiquid, it is volume of the buffer filled with hydraulic oil；
VOil, it is the volume of the buffer oil pocket；
D1 is the diameter of the buffering piston bar 2；
D2 is the diameter of the buffer outer cylinder 1；
L1 is the length of the buffering piston bar 2；
L2 is the length of the buffer outer cylinder 1；
Y1 is the buffer oil pocket length axial along its outer cylinder 1；
Y2 is located at 1 inner part of buffer inner cylinder along axial length for the buffering piston bar 2.
Above-mentioned theory functional relation is being applied, the parameter being related to for it is directed to the buffer of a certain type, ability
Field technique personnel can be obtained by consulting the structural parameters of buffering, can also be easy to think also through other by directly measuring to obtain
To or this field pass through frequently with means obtain.Experiment proves that the X0 and reality that are obtained according to above-mentioned theory functional relation
Difference is no more than 1%, can meet technical application in the art.
Further, functional relation is one in multiple fitting function relational expressions；Multiple fitting function relational expressions, packet
It includes: P=f (X0)iI=1,2,3 ... ... n；Wherein, P=f (X0)iBy TiWhen reference data be fitted to obtain；TiWhen base value
According to passing through TiWhen benchmarks obtain, TiWhen benchmarks be in standard inflation state in buffer, and in buffer air cavity
Kelvin is TiUnder conditions of carry out.`
Above-mentioned fitting function relational expression, the reference data obtained by benchmarks are directly fitted and obtain, and accuracy can be with
It is guaranteed.
Further, functional relation is P=f (X0)kWherein, k ∈ (1,2,3 ... ... n), and | Tk-T|≤|Ti- T |, i
=1,2,3 ... ... n.In this regard, skilled addressee readily understands that be P=f (X0)kFor in multiple fitting function relational expressions
One, by TkWhen reference data be fitted to obtain, TkIn TiClosest to T in i=1,2,3 ... ... n.
Further, X0 is obtained according to P and T, is obtained including one by consulting multiple pressure and stretching out in relational graph
X0；Multiple pressure and stretching relational graph, comprising: (P~X0)iRelational graph, i=1,2,3 ... ... n；Wherein, (P~X0)iRelational graph
For according to TiWhen reference data draw P~X0 relational graph；TiWhen reference data pass through TiWhen benchmarks obtain, Ti
When benchmarks be in standard inflation state in buffer, and in buffer air cavity Kelvin be TiUnder conditions of carry out.
Further, X0 is obtained according to P and T, to pass through access (P~X0)kRelational graph obtains X0, wherein k ∈ (1,2,
3 ... ... n), and | Tk-T|≤|Ti- T |, i=1,2,3 ... ... n.In this regard, skilled addressee readily understands that be (P~
X0)kFor multiple pressure and stretch out relational graph in one, by TkWhen reference data draw to obtain, TkIn TiI=1,2,
Closest to T in 3 ... ... n.
Further, benchmarks data when Ti, comprising: (Pij, X0ij), j=1,2,3 ... m；TiWhen benchmark it is real
It tests, comprising: measuring process: axially buffer rotating cylinder being pushed to move along buffer rotating cylinder, obtain a benchmark of buffer
State measures P, X0 under the normal condition；Recording step: duplicate measurements step m times；Step is measured by the q times to obtain
P be recorded as Piq, the X0 that step obtains, which is measured, by the q times is recorded as X0iq, q=1,2,3 ... m；To obtain TiWhen
Benchmarks data (Pij, X0ij), j=1,2,3 ... m.
Further, judged to obtain the inflated condition of buffer according to X0 and X, comprising: Step 1: judgement | X0-X | whether
More than reservation threshold；Step 2: if | X0-X | it is less than reservation threshold, obtaining the inflated condition that buffer fills is the blowing pressure
Normally.
Further, in step 2, if | X0-X | it is more than reservation threshold, judges whether X0 is greater than X；If X0 is greater than X,
Obtaining buffer inflated condition is that the blowing pressure is relatively low；Otherwise, then obtaining buffer inflated condition is that the blowing pressure is higher.
As to disclosed herein one more specifically embodiment referring to as follows:
Measure to obtain P=3.0MPa, T, the X=290mm of airplane buffer under a certain state,
(P~X0) k relational graph is consulted according to T, as shown in figure 5, obtaining X0=300mm；
If reservation threshold is set as 5mm, obtaining buffer inflated condition is that the blowing pressure is relatively low.
The above, the only specific embodiment of the application, but the protection scope of the application is not limited thereto, it is any
Within the technical scope of the present application, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
Cover within the scope of protection of this application.Therefore, the protection scope of the application should be with the scope of protection of the claims
It is quasi-.
Claims (10)
1. a kind of undercarriage buffer air pressure detection method characterized by comprising
P is obtained, the P is buffer air cavity pressure；
T is obtained, the T is Kelvin in the buffer air cavity；Joined according to the feature of the P, the T and the buffer
Number obtains X0, and when the X0 is that the buffer is in standard inflation state, piston rod (2) stretches out the theory of its outer cylinder (1)
Length；
X is obtained, the X is that the piston rod (2) of the buffer stretches out the physical length that the buffer stretches out outer cylinder (1)；
Judge to obtain the inflated condition of the buffer according to the X0 and the X.
2. detection method according to claim 1, which is characterized in that it is described that X0 is obtained according to the P and the T, including
It is calculated according to the functional relation of the P and the T and the X0.
3. detection method according to claim 2, which is characterized in that
The characteristic parameter includes N, L1, D1, D2 and VLiquid；
The functional relation is theory function relational expression:
P=NRT/ (π D1*D1*L1+ π D2*D2* (L1-X0))/4-VLiquid)；
Wherein,
N is under standard inflation state, the amount of the gaseous matter in the buffer air cavity for the buffer；
R is ideal gas constant；
L1 is the length of the buffering piston bar (2)；
D1 is the diameter of the buffering piston bar (2)；
D2 is the diameter of the buffer outer cylinder (1)；
VLiquid, it is volume of the buffer filled with hydraulic oil.
4. detection method according to claim 2, which is characterized in that
The functional relation is one in multiple fitting function relational expressions；
Multiple fitting function relational expressions, comprising: P=f (X0)i, i=1,2,3 ... ... n；
The P=f (X0)iBy TiWhen reference data be fitted to obtain；
The TiWhen reference data pass through TiWhen benchmarks obtain, the TiWhen benchmarks at the buffer
In standard inflation state, and in the buffer air cavity, Kelvin is TiUnder conditions of carry out.
5. detection method according to claim 4, which is characterized in that the functional relation is P=f (X0)k, wherein |
TK-T|≤|Ti-T|。
6. detection method according to claim 1, which is characterized in that
It is described that X0 is obtained according to the P and the T, it is obtained including one by consulting multiple pressure and stretching out in relational graph
X0；
Multiple pressure and stretching relational graph, comprising: (P~X0)iRelational graph, i=1,2,3 ... ... n；
(P~X0)iRelational graph is according to TiWhen reference data draw P~X0 relational graph；
The TiWhen reference data pass through TiWhen benchmarks obtain, the TiWhen benchmarks at the buffer
In standard inflation state, and in the buffer air cavity, Kelvin is TiUnder conditions of carry out.
7. detection method according to claim 6, which is characterized in that it is described that X0 is obtained according to the P and the T, it is logical
Cross access (P~X0)kRelational graph obtains X0, wherein | Tk-T|≤|Ti-T|。
8. the detection method according to claim 5 or 7, which is characterized in that
The TiWhen benchmarks data, comprising: (Pij, X0ij),j=1,2,3 ... m；
The TiWhen benchmarks, comprising:
Measuring process: axially pushing buffer rotating cylinder (2) movement along the buffer rotating cylinder (2), obtains described slow
A normal condition for rushing device, measures P, X0 under the normal condition；
Recording step: it repeats described measuring process m times；
The P that the measuring process obtains, which is carried out, by the q times is recorded as Piq, the X0 that the measuring process obtains, which is carried out, by the q times remembers
Record is X0iq,q=1,2,3 ... m；To obtain the TiWhen benchmarks data (Pij, X0ij), j=1,2,3 ... m.
9. detection method according to claim 1, which is characterized in that described to judge to be delayed according to the X0 and the X
Rush the inflated condition of device, comprising:
Step 1: judgement | X0-X | it whether is more than reservation threshold；
Step 2: if | X0-X | it is less than reservation threshold, obtaining the inflated condition that the buffer fills is that the blowing pressure is normal.
10. detection method according to claim 9, which is characterized in that
In the step 2, if | X0-X | it is more than reservation threshold, judges whether X0 is greater than X；
If the X0 is greater than X, obtaining the buffer inflated condition is that the blowing pressure is relatively low；Otherwise, then the buffering is obtained
Device inflated condition is that the blowing pressure is higher.
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