CN102508945A - Aviation nitrogen-filling vehicle gas circuit system dynamic electric simulation method and device - Google Patents

Abstract

The invention discloses an aviation nitrogen-filling vehicle gas circuit system dynamic electric simulation method and device. A gas cylinder pipeline network is converted into a dynamic circuit topology by using the equivalent corresponding relation of a gas circuit system and an electric system. By using the aviation nitrogen-filling vehicle electric simulation method and device, an initial gas cylinder pressure value can be set, and then the gas-filling flow of a nitrogen-filling vehicle can be dynamically simulated by only acquiring the state of each switch valve. The method and device provided by the invention have practical value and significance for an operator to well know the gas-filling flow of the nitro-filling vehicle, understand the working principle of each flow, practice the adaptability of the operator to sudden accident and locate and analyze the fault.

Description

The dynamic electric analogy method and apparatus of aviation Nitrogen filling vehicle air-channel system

Technical field:

The present invention relates to dynamic similation equipment and method, especially the dynamic electric analogy method and apparatus of aviation Nitrogen filling vehicle air-channel system.

Background technology:

Along with the continuous development of modern technical aeronautics and air armament equipment, nitrogen and oxygen have obtained application widely in civilian, military flight and ground maintenance ensure.According to the existing flight support system of China, flight is mainly produced by the ground system oxygen equipment of making nitrogen with nitrogen and oxygen, and with the gas cylinder storage, and flying, preceding to charge into aircraft bottle by oxygenation, Nitrogen filling vehicle subsequent use.

Nitrogen filling vehicle is as the major equipment of airport ground, and the supply guarantee quality directly has influence on flight safety.Simultaneously, operating personnel's skills involved in the labour are to decisive role such as airport production safety, equipment service efficiency, serviceable lifes.Flow process is complicated, working specification is strict in view of the Nitrogen filling vehicle equipment cost increases day by day, inflates, and requires more and more high to operator quality.

Aviation Nitrogen filling vehicle mainly branch ground gas station changes four kinds of inflations such as outside filling nitrogen of gas cylinder and periodic duty flow process in inflated with nitrogen, the car between gas cylinder in gas cylinder filling nitrogen, the car in car.Actual Nitrogen filling vehicle is equipped in flight support or the training, mainly waits by relevant rain glass and valve switch state and judges the real-time working state, like gas flow, inflate flow process, each gas cylinder air pressure change etc.Yet, if Nitrogen filling vehicle valve start-stop malposition or rain glass damage, operating personnel's judgment task state of just having no way of, thus cause serious work accident.And, do not allow artificially to be provided with fault in the actual production, generally do not allow informal operation yet, shown in phenomenon when not understanding abnormal work, thereby can not train the experience of emergency case correct handling.If can work out the dynamic emulation method of Nitrogen filling vehicle air-channel system, just can know lucidly and observe, understand gas flow and inflation flow process in the pipeline.The necessity of this Nitrogen filling vehicle ASS research of the present invention just.

Actual Nitrogen filling vehicle often receives the restriction of place, funds and equipment self maintained maintenance situation etc. in training; And based on the training of analogue simulation system of the present invention; Can be safely, economical, controlled, repeatedly repetition, devoid of risk, do not receive weather conditions and place space constraint; Can train by routine operation, again can adaptability to changes and the faults analysis location of operator training to handling various accidents.This all has very big actual value and realistic meaning to the security that helps operating personnel's understand and master Nitrogen filling vehicle inflation flow process, raising operating personnel professional skill, enhancing airport ground to ensure.

Summary of the invention

Deficiency in view of prior art the objective of the invention is to study the dynamic electric analogy method of a kind of aviation Nitrogen filling vehicle air-channel system, the inflation flow process of simulation aviation Nitrogen filling vehicle.

The present invention realizes through following method:

The dynamic electric analogy method of aviation Nitrogen filling vehicle air-channel system; Utilize the equivalent corresponding relation of air-channel system and electric system; The gas cylinder piping network is converted into the dynamic circuit model, goes out situation such as gas flow, inflation flow process, gas cylinder air pressure change with the dynamic response real time modelling of circuit model; Components and parts and gas path pipe in the said gas cylinder pipeline network system correspond to following electric components and branch road:

1). the electric capacity in the gas cylinder equivalence corresponding circuits topology;

2). channel flow dynamic resistance equivalence corresponding circuits resistance;

3). gas circuit topoligical equivalence corresponding circuits topology;

4). controlled valve equivalence corresponding circuits switch;

5). the controlled current source of gas compressor equivalence corresponding circuits;

6). non-return valve equivalence corresponding circuits diode;

7). tensimeter equivalence corresponding circuits voltage table;

8). reduction valve equivalence corresponding circuits stabilivolt;

Dynamic circuit figure after air-channel system schematic diagram and the equivalence respectively like accompanying drawing 1, shown in 2, it is following to replenish concrete detailed rules and regulations:

1. during the shutoff of gas valve, the resistance in the corresponding circuits is infinitely large quantity; During each valve open, resistance value is represented the channel flow dynamic resistance in the corresponding circuits;

When 2. the equivalence of gas compressor M pipeline was in circuit, the air inlet pipeline equivalence was through resistance R 0 ground connection, and R0 resistance size characterizes compressor throttle size; Compressor and outlet pipe equivalence are the controlled current source CCCS of minus earth, and its controlled quentity controlled variable is the electric current that flows through resistance R 0;

3. the rain glass in the air-channel system, advance inflation and connect mouth and in circuit model, need not to make its equivalence element, the rain glass registration equals respective nodes magnitude of voltage in the circuit;

4. meet mouth J1 for the ground gas cylinder of Nitrogen filling vehicle air-channel system and the aircraft inflation meets mouth J2, J3: when the ground gas cylinder inserted J1, equivalence same position on circuit model inserted the equivalent capacity Cd of ground gas cylinder; When no ground gas cylinder inserts J1, connect outspoken ground connection on the equivalent circuit devices.In like manner, as J2, when J3 inserts aircraft, equivalence same position place in circuit arrangement inserts aircraft bottle equivalent capacity Cf; When J2, J3 do not insert aircraft, equivalence is connecing the direct ground connection in mouth place.For the equivalent ground state of above-mentioned J1, J2, J3, come equivalent simulation through composing infinitely large quantity for Cd, Cf.

The present invention also aims to: set up a dynamic electric analog(ue) model of aviation Nitrogen filling vehicle air-channel system, the simulative training platform of inflate flow process for operating personnel are familiar with the grasp Nitrogen filling vehicle, understand each works principle, the training and operation personnel analyzing to the adaptability to changes and the failure location of burst accident.

Utilize aviation Nitrogen filling vehicle electric analogy method and apparatus of the present invention, only need set initial each gas cylinder atmospheric pressure value, only need to gather the state of each controlled valve afterwards, just can dynamic mode draw up the inflation flow process of Nitrogen filling vehicle.The present invention for operating personnel be familiar with to grasp Nitrogen filling vehicle inflation flow process, understand each works principle, the training and operation personnel have actual value and meaning to the adaptability to changes and the failure location analysis of burst accident.

Description of drawings:

Fig. 1 is an aviation Nitrogen filling vehicle pipeline principle flow chart.

Fig. 2 is the dynamic circuit installation drawing of Nitrogen filling vehicle air-channel system equivalence.

Embodiment

As shown in Figure 1, aviation Nitrogen filling vehicle air-channel system is filled valve, is increased and supply valve, gas filling valve, air release, rain glass, safety valve, non-return valve, reduction valve, pressure regulator valve, advance inflation and connect mouth etc. and constitute by gas cylinder, membrane compressor, pipeline, commentaries on classics.

The equivalence that works out above-mentioned air-channel system and electric system is regular as follows:

1). the electric capacity in gas cylinder in the gas cylinder pipeline network system equivalence corresponding circuits topology promptly: the corresponding capacitance voltage of the pressure of gas cylinder; The corresponding capacitance charge amount of gas cylinder tolerance; The corresponding capacitance current of gas cylinder air-flow; The corresponding electric capacity of gas cylinder capacity.

2). channel flow dynamic resistance equivalence corresponding circuits resistance.

3). gas circuit topoligical equivalence corresponding circuits topology.

4). controlled valve equivalence corresponding circuits switch.

5). the CCCS of gas compressor equivalence corresponding circuits.

6). non-return valve equivalence corresponding circuits diode.

7). tensimeter equivalence corresponding circuits voltage table.

8). reduction valve equivalence corresponding circuits stabilivolt.

According to top equivalence rule, gas circuit symbolic equivalent corresponding electrical circuits symbol concrete among Fig. 1 is as shown in the table:

The equivalent corresponding relation of table 1 Nitrogen filling vehicle air-channel system and circuit model

Need to prove: because the complicacy when diode D1～D5, stabilivolt Dz, safety valve AQ1, AQ2 and pressure regulator TF non-linear circuit characteristic are set up state equation in system in the equivalent electrical circuit, practical experience sums up the available software algorithm and realizes the said elements circuit characteristic.In addition, equivalent details is in the additional equivalent modeling process:

1. during the shutoff of gas valve, the resistance in the corresponding circuits is infinitely large quantity; During each valve open, resistance value is represented the channel flow dynamic resistance in the corresponding circuits.

When 2. the equivalence of gas compressor M pipeline was in circuit, the air inlet pipeline equivalence was through resistance R 0 ground connection, and its resistance characterizes compressor throttle size; Compressor and outlet pipe equivalence are the controlled current source CCCS of minus earth, and its controlled quentity controlled variable is the electric current that flows through resistance R 0.

3. the rain glass B1～B7 in the air-channel system, advance inflation and meet mouth J1, J2, J3 and in circuit model, need not to make its equivalence element, the rain glass registration equals respective nodes magnitude of voltage in the circuit;

4. the negative pole of the negative pole of the negative pole of capacitor C 1_1～C3_3, controlled current source CCCS, resistance R 0 is answered ground connection in the equivalent electrical circuit.

5. meet mouth J1 for the ground gas cylinder of Nitrogen filling vehicle air-channel system and the aircraft inflation meets mouth J2, J3: when the ground gas cylinder inserted J1, equivalence same position on circuit model inserted the equivalent capacity Cd (see figure 2) of ground gas cylinder; When no ground gas cylinder inserts J1,, connect the outspoken ground connection that connects on the equivalent-circuit model because corresponding air inlet branch road contains non-return valve.In like manner, as J2, when J3 inserts aircraft, equivalence same position in circuit model inserts the equivalent capacity Cf of aircraft bottle; When J2, J3 do not insert aircraft, equivalence is connecing the direct ground connection in mouth place.And, come equivalent simulation through composing infinitely large quantity for capacitor C d, Cf for the equivalent ground state of above-mentioned J1, J2, J3.

Through above step, the equivalence of Nitrogen filling vehicle air-channel system becomes the dynamic circuit model of elements such as containing resistance, electric capacity, current source, is Nitrogen filling vehicle air-channel system equivalent circuit devices shown in Figure 2.As shown in the figure, resistance capacitance branch road I, II, III are made up of three groups of resistance in series electric capacity of parallel connection respectively; Be connected across the following branch road that has at equivalent capacity Cd two ends: characterize compressor throttle size resistance R 0, change charging resistance R1, R2, R3 respectively with the series arm of the equivalent capacity Cf of three branch roads, circulation resistance R 7 and inflation resistance R 10 and aircraft bottle after resistance capacitance branch road I, II, III connects; Controlled current source CCCS and diode D2 series arm are in parallel with aircraft bottle equivalent capacity Cf series arm with inflation resistance R 10; An end that increases resistive R4, R5, R6 links to each other with the output terminal of D2, and its other end links to each other with commentaries on classics charging resistance R1, R2, R3 respectively.

This circuit model has similar topology with air-channel system, and in graph theory, is all nonplanar graph.Device symbol in the corresponding air-channel system of circuit component label difference: valve K (i) in the corresponding gas circuit of resistance R in the circuit (i); The corresponding gas cylinder P of capacitor C (i) (i) (i is each element numbers among the figure); Diode D1, D2 be corresponding non-return valve Z1, Z2 respectively; Wherein Cd is the equivalent capacity of ground gas cylinder, and expression air-channel system J1 has the ground gas cylinder to insert; Cf is the equivalent capacity of aircraft bottle, and J2, J3 have aircraft bottle to insert in the expression air-channel system.Distinguishingly, if J1, J2, J3 do not insert ground and aircraft bottle, then making capacitor C d among the figure, Cf is infinitely large quantity equivalence ground state.R0 is used for characterizing compressor throttle size; Flow through its current i and represent the charge air flow of compressor; This current i is simultaneously as the controlled quentity controlled variable of controlled current source, controlled current source representative model compressor, and the principle of work of compressor is simulated through R0 current i and controlled current source CCCS with regard to available stream like this.

The circuit model of comprehensive above-mentioned gained, the magnitude of voltage variation of electric capacity promptly reflects gas cylinder air pressure change in the air-channel system; Branch current promptly reflects the air-channel system chimneying; Current i has characterized the compressor operating situation among resistance R 0, the controlled current source CCCS.This circuit model reaches the design object of simulating Nitrogen filling vehicle air-channel system workflow fully together with diode D1～D5, stabilivolt Dz, safety valve AQ1, AQ2 and the pressure regulator TF circuit characteristic realized with software.

Then set up the state equation of the dynamic circuit after the equivalence.

Utilize graph theory knowledge, all corresponding branch road of each element in the circuit is made the digraph of Fig. 2 circuit.Select a tree as proper tree, its tree props up and is: 11 branch roads at capacitor C d, Cf, C1_1～C33 place, 5 branch roads at resistance R 0, R10, R1_1, R2_1, R3_1 place; And remaining current source branch of digraph, resistance branch are chord.To electric capacity place branch road, write order by the row of tree behind the first chord and make fundamental cut set matrix Q _fWith fundamental circuit matrix B _f, obtain following formula:

Q _f＝[Q ₁₁|E] _(n-1)×b (1)

B _f＝[E|B ₁₂] _(b-n+1×b(2)

Wherein, E representation unit matrix.I _K, I _TThe column vector of expression chord, a tree electric current; U _K, U _TThe column vector of expression chord, a tree voltage.Thereby obtain:

$I_b=\left[\begin{array}{c}{I}_K\\ I_T\end{array}\right]---\left(3\right)$ $U_b=\left[\begin{array}{c}{U}_K\\ U_T\end{array}\right]---\left(4\right)$

For fundamental cut set matrix Q _fQ is arranged _fI _b=0

Following formula substitution (1) gets I _T=-Q ₁₁I _K(5)

For fundamental circuit matrix B _fB is arranged _fU _b=0

Following formula substitution (2) gets U _K=-B ₁₂U _T(6)

And Q in the graph theory _fAnd B _fRelation $B_{12}=-Q_{11}^T---\left(7\right)$

Various above the substitution (7), abbreviation gets $U_K=Q_{11}^T{U}_T$

I _T＝-Q ₁₁I _K

Thereby obtain the state equation matrix form

$\left[\begin{array}{c}{U}_K\\ I_T\end{array}\right]=\left[\begin{array}{cc}0& Q_{11}^T\\ -Q_{11}& 0\end{array}\right]\left[\begin{array}{c}{I}_K\\ U_T\end{array}\right]---\left(8\right)$

Own like this

Differential term is included in the left side of matrix equation, i _s, u _C, i _R,

These state variables and constant are included in matrix equation the right.Only row write out the equation that contains

differential term from matrix equation; And the equation both sides obtain following state equation form all with divided by capacitor C coefficient separately:

$\left[\begin{array}{c}\frac{{\mathrm{<figure-callout\; id="1"\; label="du\; c"\; filenames="HDA0000097921260000011.png"\; state="\{\{state\}\}">du</figure-callout>}}_c}{\mathrm{dt}}\\ \frac{{\mathrm{du}}_{c2}}{\mathrm{dt}}\\ M\\ \frac{{\mathrm{du}}_{\mathrm{cn}}}{\mathrm{dt}}\end{array}\right]=\left[\begin{array}{cccc}{m}_{11}& m_{12}& L& m_{1r}\\ m_{21}& m_{22}& L& m_{2r}\\ M& M& & M\\ m_{n1}& m_{n2}& L& m_{\mathrm{nr}}\end{array}\right]\&times;\left[\begin{array}{c}{i}_1\\ i_2\\ M\\ i_r\end{array}\right]---\left(9\right)$

Electric current column vector i in the following formula (9) _{R * 1}Do not comprise with all the other

The equation of differential term is expressed: in not comprising the equation of differential term, let the matrix A of resistance as element _{R * r}Multiply by i _{R * 1}Column vector equals u _C1～u _CnThe column vector U that expression formula is formed _{R * 1}That is:

$\left[\begin{array}{cccc}{a}_{11}& a_{12}& L& a_{1r}\\ a_{21}& a_{22}& L& a_{2r}\\ M& M& & M\\ a_{r1}& a_{r2}& L& a_{\mathrm{rr}}\end{array}\right]\&times;\left[\begin{array}{c}{i}_1\\ i_2\\ M\\ i_r\end{array}\right]=\left[\begin{array}{c}{g}_1({\mathrm{<figure-callout\; id="1"\; label="u\; c"\; filenames="HDA0000097921260000011.png"\; state="\{\{state\}\}">u</figure-callout>}}_c,u_{c2},L{u}_{\mathrm{cn}})\\ g_2({\mathrm{<figure-callout\; id="1"\; label="u\; c"\; filenames="HDA0000097921260000011.png"\; state="\{\{state\}\}">u</figure-callout>}}_c,u_{c2},L{u}_{\mathrm{cn}})\\ M\\ g_r({\mathrm{<figure-callout\; id="1"\; label="u\; c"\; filenames="HDA0000097921260000011.png"\; state="\{\{state\}\}">u</figure-callout>}}_c,u_{c2},L{u}_{\mathrm{cn}})\end{array}\right]---\left(10\right)$

And column vector g in the top formula _{R * 1}Upstate variable u _C1～u _CnBe expressed as:

$\left[\begin{array}{c}{g}_1({\mathrm{<figure-callout\; id="1"\; label="u\; c"\; filenames="HDA0000097921260000011.png"\; state="\{\{state\}\}">u</figure-callout>}}_c,u_{c2},L{u}_{\mathrm{cn}})\\ g_2({\mathrm{<figure-callout\; id="1"\; label="u\; c"\; filenames="HDA0000097921260000011.png"\; state="\{\{state\}\}">u</figure-callout>}}_c,u_{c2},L{u}_{\mathrm{cn}})\\ M\\ g_r({\mathrm{<figure-callout\; id="1"\; label="u\; c"\; filenames="HDA0000097921260000011.png"\; state="\{\{state\}\}">u</figure-callout>}}_c,u_{c2},L{u}_{\mathrm{cn}})\end{array}\right]=\left[\begin{array}{cccc}{p}_{11}& p_{12}& L& p_{1n}\\ p_{21}& p_{22}& L& p_{2n}\\ M& M& & M\\ p_{r1}& p_{r2}& L& p_{\mathrm{rn}}\end{array}\right]\&times;\left[\begin{array}{c}{u}_{c1}\\ u_{c2}\\ M\\ u_{\mathrm{cn}}\end{array}\right]---\left(11\right)$

To sum up, by state matrix push away the final expression formula of state equation:

${\left[\frac{{\mathrm{du}}_c}{\mathrm{dt}}\right]}_{n\&times;1}=M_{n\&times;r}\&times;A_{r\&times;r}^{-1}\&times;P_{r\&times;n}{\left[u_c\right]}_{n\&times;1}---\left(12\right)$

Provide the derivation algorithm of state equation at last.

Can obtain the 11 rank dynamic circuits state equation of (circuit contains 11 independent capacitances, and promptly air-channel system contains gas cylinder on 9 cars, adds upper ground surface gas cylinder and aircraft bottle) through top step.State equation is mathematical differential equation of first order group, and common Long Gekuta (Runge-Kutta) algorithm just is directed against a differential equation, and the present invention has improved quadravalence Long Gekuta algorithm, makes it adapt to finding the solution of differential equation of first order group.For differential equation of first order group shown in the formula (12), find the solution differential equation of each row successively: let state matrix

The capable state vector [u that multiply by of i _c] _{N * 1}Value obtain the functional value of i the differential equation, renewal function independent variable [u then _c] _{N * 1}Obtain quadravalence Long Gekuta algorithm coefficient k 1, k2, k3, k4, accomplish finding the solution of the capable differential equation of i.The similar state variable value that can solve the differential equation of each row successively.

Here provide the method that realizes safety valve gas circuit characteristic in circuit characteristic and the air-channel system of diode, stabilivolt, ideal transformer in the circuit with software:

1). because the first order differential of the capacitance voltage of state variable equals the size of current of capacitive branch,, express this branch current size with the state variable first order differential for the branch road that contains diode.Whether find the solution before the state equation with Long Gekuta, it is reverse to detect this branch current direction at every turn like this.If reverse, then give infinitely large quantity this branch road resistance, make this branch road in circuit, be equivalent to turn-off, with the unidirectional on state characteristic of this equivalent diode.

2). for the branch road that contains stabilivolt and ideal transformer,, think that the input branch road is open-minded when stabilivolt input voltage during less than the reduction valve setting value; When stabilivolt input voltage during greater than the reduction valve setting value, be equivalent to import branch road and end, compose infinitely large quantity for branch road resistance and make its shutoff.Ideal transformer is the adjustable stabilivolt of magnitude of voltage in fact, is at first gone out the voltage stabilizing value of ideal transformer by the pressure regulation calculation of parameter that collects, and can come the circuit characteristic of equivalent ideal transformer then by the software implementation method of stabilivolt.

3). for the safety valve of air-channel system connection, because the principle of work of air-channel system safety valve is the setting value that surpasses or equal safety valve when this node air pressure, even gaseous emission is realized the pressure release effect in atmosphere.So in circuit model, calculate this node voltage value in real time; If real voltage is greater than the safety valve setting value; Only need to flow into the electric current invalidation of this position; Promptly the gas cylinder atmospheric pressure value from this node inflow current keeps currency always, then presses original situation of change to the gas cylinder of this node input current and changes.

Claims (2)

1. the dynamic electric analogy method of aviation Nitrogen filling vehicle air-channel system; Utilize the equivalent corresponding relation of air-channel system and electric system; The gas cylinder piping network is converted into the dynamic circuit model, goes out situation such as real-time gas flow, inflation flow process, gas cylinder air pressure change with the dynamic response real time modelling of circuit model; Components and parts and gas path pipe in the said gas cylinder pipeline network system correspond to following electric components and branch road:

1). the electric capacity in the gas cylinder equivalence corresponding circuits topology;

2). channel flow dynamic resistance equivalence corresponding circuits resistance;

3). gas circuit topoligical equivalence corresponding circuits topology;

4). controlled valve equivalence corresponding circuits switch;

5). the controlled current source of gas compressor equivalence corresponding circuits;

6). non-return valve equivalence corresponding circuits diode;

7). tensimeter equivalence corresponding circuits voltage table;

8). reduction valve equivalence corresponding circuits stabilivolt;

And:

1. during the shutoff of gas valve, the resistance in the corresponding circuits is infinitely large quantity; During each valve open, the resistance value size expression valve opening degree and the gas circuit resistance of ducting in the corresponding circuits;

When 2. the equivalence of gas compressor M pipeline was in circuit, the air inlet pipeline equivalence was through resistance R 0 ground connection, and R0 resistance size characterizes compressor throttle size; Compressor and outlet pipe equivalence are the controlled current source CCCS of minus earth, and its controlled quentity controlled variable is the electric current that flows through resistance R 0;

3. the respective nodes magnitude of voltage is represented in the rain glass available circuit in the air-channel system;

4. the inflation that connects mouth J1 and aircraft bottle for the air inlet of ground gas cylinder in the air-channel system meets mouth J2, J3: when the ground gas cylinder inserted J1, equivalence same position on circuit model inserted the equivalent capacity Cd of ground gas cylinder; When no ground gas cylinder inserts J1, connect outspoken ground connection on the equivalent-circuit model; As J2, when J3 inserts aircraft, equivalence same position in circuit model inserts the equivalent capacity Cf of aircraft bottle; When J2, J3 do not insert aircraft, equivalence is connecing the direct ground connection in mouth place; For the equivalent ground state of above-mentioned J1, J2, J3, through coming equivalent simulation for Cd, Cf compose infinitely large quantity.

2. the dynamic electric copying device of aviation Nitrogen filling vehicle air-channel system is characterized in that, resistance capacitance branch road I, II, III are made up of three groups of resistance in series electric capacity of parallel connection respectively; Be connected across the following branch road that has at equivalent capacity Cd two ends: characterize compressor throttle size resistance R 0, change charging resistance R1, R2, R3 respectively with the series arm of the equivalent capacity Cf of three branch roads, circulation resistance R 7 and inflation resistance R 10 and aircraft bottle after resistance capacitance branch road I, II, III connects; Controlled current source CCCS and diode D2 series arm are in parallel with aircraft bottle equivalent capacity Cf series arm with inflation resistance R 10; An end that increases resistive R4, R5, R6 links to each other with the output terminal of D2, and its other end links to each other with commentaries on classics charging resistance R1, R2, R3 respectively.

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