WO2016051047A1 - Procede de suppression d'effet pogo. - Google Patents
Procede de suppression d'effet pogo. Download PDFInfo
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- WO2016051047A1 WO2016051047A1 PCT/FR2015/052520 FR2015052520W WO2016051047A1 WO 2016051047 A1 WO2016051047 A1 WO 2016051047A1 FR 2015052520 W FR2015052520 W FR 2015052520W WO 2016051047 A1 WO2016051047 A1 WO 2016051047A1
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- WIPO (PCT)
- Prior art keywords
- hydraulic
- resonance frequency
- current
- alternative
- transition
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/44—Feeding propellants
- F02K9/50—Feeding propellants using pressurised fluid to pressurise the propellants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/44—Feeding propellants
- F02K9/56—Control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/44—Feeding propellants
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/44—Feeding propellants
- F02K9/52—Injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/44—Feeding propellants
- F02K9/56—Control
- F02K9/566—Control elements and safety devices, e.g. pressure relief valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/60—Constructional parts; Details not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/96—Preventing, counteracting or reducing vibration or noise
Definitions
- the effect name POGO has been given to the resonance input of a liquid propellant in the supply circuit of a jet engine with mechanical oscillations of the machine propelled by the jet engine. Since engine thrust can vary with the propellant flow rate provided by the fuel system, such a resonance input can cause rapidly diverging oscillations, and thus lead to guiding difficulties, and even damage up to 'to the total loss of its payload, or even the vehicle.
- the name POGO effect does not come from an acronym, but "pogo sticks" or jumping stilts, toys formed by a spring rod whose leaps have reminded technicians violent longitudinal oscillations of rockets caused by this effect. Since the beginning of the development of liquid propellant rockets, it has therefore proved very important to take measures to suppress this POGO effect. In the context of the present description, “suppression” is understood to mean both total suppression and partial reduction.
- such a hydraulic accumulator would correspond to a capacitor with a fixed capacitance.
- the compressibility and damping parameters of such an accumulator are substantially constant, or at least can not be controlled.
- an oscillation oscillation of pressure-flow in the supply circuit is created, coming to oppose the oscillations measured in the circuit.
- the international patent application WO 2012/156615 disclosed several POGO effect suppression devices and methods, by which it is possible to vary the hydraulic resonance frequencies in the power system to maintain a distance. with mechanical resonance frequencies throughout the flight of the craft.
- this prior document disclosed the use, in a feed system of a jet engine in at least one propellant, of a hydraulic accumulator for selecting between several predetermined operating levels each corresponding to a different volume of gas in the hydraulic accumulator.
- such an electric accumulator would correspond to a variable capacity capacitor between several predetermined levels.
- At least one hydraulic resonance frequency can briefly cross a frequency of mechanical resonance to move from a first step, which is no longer sufficiently distant from the mechanical resonance frequency, to a second step, sufficiently distant from the mechanical resonance frequency, but located on the opposite side of the frequency curve of mechanical resonance. If such a transient and rapid crossing of resonance frequencies can not normally trigger a resonance, they should nevertheless be avoided.
- the present invention aims to remedy these disadvantages.
- the aim of the invention is to provide a method that makes it possible to eliminate the POGO effect more effectively by avoiding, to a large extent, the even transient crossing of hydraulic and mechanical resonance frequencies.
- this object is achieved by virtue of the fact that after the following steps:
- a set of differences between each alternating hydraulic resonance frequency and each current mechanical resonance frequency is calculated for each alternative level and, if said first criterion of reference is filled by each set of differences of a plurality of alternative bearings, a transition of the hydraulic accumulator from the current bearing to a bearing is controlled rectifier, selected from said alternative stages for which the first reference criterion is filled, and for which no hydraulic resonance frequency intersects any current mechanical resonance frequency during the transition.
- the hydraulic accumulator offers at least one alternative bearing fulfilling the first reference criterion and can be reached without frequency crossing, it is this step that will be selected, thus avoiding a crossover presenting a risk even reduced. resonance input.
- the first reference criterion is fulfilled by each set of differences of a plurality of alternative steps that can be achieved without any frequency crossing.
- said transition could be controlled to an alternating stage, selected from those for which the first reference criterion is fulfilled and to which the transition does not involve any frequency crossing, for which a comparative parameter, calculated according to the corresponding set of differences, has a maximum value, thus allowing further optimization of the choice of the alternative bearing towards which the transition will take place.
- This comparative parameter can be, for example, the minimum difference among said set of differences, the sum of said set of differences, or the modulus of a vector whose components would be said set of differences.
- the first reference criterion is filled by each set of differences of a plurality of alternative steps that can be achieved without any frequency crossing and whose comparative parameter has the same maximum value.
- the first reference criterion is not filled by all the current differences but is filled by the set of differences for a single alternative level.
- a transition of the hydraulic accumulator could be controlled to the single alternative bearing completely fulfilling the first reference criterion.
- Said first reference criterion may be that each of the differences of said set of differences is greater than a predetermined threshold. It may also prove that said first reference criterion is not fulfilled for any level, current or alternative, but that a second, less restrictive reference criterion is fulfilled for a set of alternative levels.
- a transition of the hydraulic accumulator could be controlled to an alternating bearing, selected from the set of alternative bearings for which the second reference criterion is filled, for which a comparative parameter, calculated according to the set of corresponding differences, presents a maximum value.
- this comparative parameter could be, for example, the minimum difference among said set of differences, the sum of said set of differences, or the modulus of a vector whose components would be said set of differences.
- Said second reference criterion may be that each of the differences of said set of differences is greater than a predetermined threshold, which could be a fraction of the threshold corresponding to the first criterion.
- a predetermined threshold which could be a fraction of the threshold corresponding to the first criterion.
- said first reference criterion is filled by each set of differences of a plurality of alternative steps, it can be determined whereas, during the transition of the current bearing hydraulic accumulator to a selected alternate bearing from among said alternative bearings for which the first reference criterion is fulfilled, no hydraulic resonance frequency will intersect any current mechanical resonance frequency, determining first, for each mode of said set of hydraulic resonance modes, a minimum hydraulic resonance frequency and a maximum hydraulic resonance frequency among the hydraulic resonance frequency for the current capacity and the hydraulic resonance frequency for the selected alternate bearing, and comparing, then, for each mode of said set of hydraulic resonance modes, the minimum hydraulic resonance frequency and the maximum hydraulic resonance frequency with the current mechanical resonance frequency for each mechanical resonance mode of said set of resonance modes m no hydraulic resonance frequency can cross any current mechanical resonance frequency during the transition to the selected alternate bearing if, for any of said modes of hydraulic and mechanical resonance, the minimum hydraulic resonance frequency is lower than the mechanical resonance frequency and the maximum hydraulic resonance frequency is greater than the mechanical resonance frequency.
- the present disclosure also relates to a machine comprising at least one jet engine, and a system for supplying said engine with at least one liquid propellant, said supply system being equipped with a hydraulic accumulator, making it possible to select between several stages of predetermined operation each corresponding to a different volume of gas in the hydraulic accumulator, and a control unit configured to perform the abovementioned POGO effect suppression method.
- the control unit may be a programmable control unit, and this disclosure therefore also relates to a computer program for implementing this POGO effect deletion method, as well as a data storage medium containing such a device. program readable by an electronic data processing unit, and an electronic data processing unit programmed to implement this method.
- data storage medium is also understood to mean any form of memory, or dead, which may contain data in computer readable form, including optical, magnetic and / or electronic media.
- FIG. 1 is a diagram, constructed by means of the hydraulic-electric analogy, of a rocket motor vehicle with a liquid propellant supply system according to one embodiment of the invention
- FIGS. 2A and 2B show cross-sections of a hydraulic accumulator with a variable gas volume installed as a bypass of a supply circuit of the system of FIG. 1;
- FIGS. 3A and 3B are graphs illustrating the evolution of the volume of gas and the hydraulic resonance frequencies of the feed system of FIG. 1 following the passage of the hydraulic accumulator FIG. 2 by several level levels;
- FIG. 4 illustrates the crossing of a hydraulic resonance frequency with a mechanical resonance frequency during the transition from one of said bearings to another;
- FIG. 5 is a block diagram of a control unit of the hydraulic accumulator
- FIG. 6 is a flowchart illustrating a frequency crossing detection algorithm
- FIGS. 7 and 8 are flowcharts illustrating, respectively, a first and a second portion of an algorithm governing a POGO effect suppression method. Detailed description of the invention
- the machine 1 shown in FIG. 1 comprises a jet engine 2 incorporating a combustion chamber and a convergent-divergent nozzle.
- the machine 1 also comprises a feed system 3, 4 for each of two liquid and chemically reactive propellants feeding this jet engine 2.
- the first feed system 3 is illustrated only partially.
- Each fluid filled supply system 3, 4 represents a dynamic system that can be modeled as an electrical circuit having resistors 5, inductances 6 and capacitances 7 and which normally has several modes of hydraulic resonance, each with a frequency of hydraulic resonance F H.
- a hydraulic accumulator 8 In order to vary at least one resonant frequency of the second supply circuit 4, it comprises, in circuit bypass, a hydraulic accumulator 8 with variable gas volume, and therefore compressibility also variable.
- plunger tubes 12a to 12d connect the reservoir 9 with the conduit 15.
- a valve 14a to 14d is interposed between the reservoir 9 and the conduit 15.
- the valves 14a to 14d are all connected to a control unit 30 to control their opening and closing.
- valves 14a to 14d make it possible to vary the level of liquid, and therefore the volume of gas 17, in the reservoir 9, as illustrated in FIGS. 2a and 2b.
- the valve 14a of the lower plunger tube 12a is open, while the valves 14b to 14d of the other plunger tubes 12b to 12d are closed.
- the free surface of the liquid is thus stabilized at the inlet of the plunger tube 12a, and the volume of gas 17 as well as the compressibility thus remain comparatively limited.
- the valve 14a of the plunger tube 12a is against closed, and it is the valve 14b of the next plunger tube 12b is open.
- the structure of the machine 1 can normally vibrate in a plurality of mechanical resonance modes, each associated with a mechanical resonance frequency fm.
- these frequencies of mechanical resonance fm evolve over time, in particular because of the progressive emptying of propellant reservoirs used to feed the combustion chamber 2.
- the frequencies of hydraulic resonance fh and the frequencies of mechanical resonance fm are initially quite distant from each other to avoid the POGO effect, in certain circumstances the evolution of mechanical resonance frequencies fm could bring them closer to the frequencies of hydraulic resonance fh until triggering this effect, if they remained unchanged.
- FIG. 3A illustrates the evolution of the volume of gas V in FIG. the accumulator 8 following the passage through several successive stages of the level of the free liquid surface in the accumulator 8.
- FIG. 3B illustrates the evolution of the hydraulic resonance frequencies fh (in Hertz) corres
- the first three hydraulic resonance modes of the second power supply circuit 4 can be evaluated. It is possible to appreciate how each of these hydraulic resonance frequencies fh also decreases in steps concurrently with the stepwise increase in the capacity of the accumulator 8. Under certain circumstances, during a transition of the hydraulic accumulator 8 from a current bearing to an alternative bearing from the set of predetermined levels, this transition is intended to increase the distance between the hydraulic resonance frequencies fh and the frequencies mechanical resonance fm, at least one of the hydraulic resonance frequencies fh can momentarily cross at least one of the mechanical resonance frequencies fm, as illustrated in FIG. 4. Although the coincidence between the hydraulic and the mechanical resonance frequencies is then only transient, which limits the risk of triggering POGO effect, these crossovers should generally be avoided.
- the control unit 30 may in particular be a data processing unit configured and / or programmed to implement the POGO effect suppression method.
- the control unit 30 may comprise a RAM or dead memory in which is recorded a series of instructions, that is to say a program, for this implementation.
- Fig. 5 is a block diagram of the control unit 30, illustrating it as a set of interconnected functional modules.
- this control unit 30 comprises a first calculation module F1 for calculating, based on physical parameters provided by sensors 31 and / or estimated through at least one model of the machine 1, and for each mode of measurement. resonance of a set of hydraulic resonance modes and mechanical resonance modes:
- the hydraulic resonance frequencies fh (x, n) of the supply system 4 corresponding to each level x of the other X levels available, that is to say with each of the alternating levels of the accumulator 8, among the set of levels predetermined, for the same resonance mode n among the set N of the hydraulic resonance modes.
- the first calculation module F1 can also calculate uncertainty intervals for each of these frequencies.
- the control unit 30 also comprises a decision module F2 for controlling a step change on the basis of the values calculated by the first calculation module F1.
- this decision module F2 can be decomposed to its a plurality of other functional modules, including a second calculation module F21 for calculating the differences DIFF (0, n, p) between each current hydraulic resonance frequency fh (0, n) and each current mechanical resonance frequency fm (p) a third calculation module F22 for calculating the differences DIFF (x, n, p) between each alternative hydraulic resonance frequency fh (x, n) and each current mechanical resonance frequency fm (p), a cross detection detection module F24 frequency, a step change detection module F25 in progress and a module F26 for selecting a bearing.
- the second and third calculation modules F21, F22 can take into account the intervals of uncertainty possibly provided by the first calculation module Fl.
- the frequency crossing detection module F24 is designed to determine for which transitions, among the set of potential transitions from the current stage, to the different alternating stages of the hydraulic accumulator 8, none of the hydraulic frequencies fh would cross none of the mechanical frequencies fm. For this, in this frequency crossing detection module F24, the following algorithm, illustrated by the flow chart of FIG. 6, is implemented:
- step S603 the current hydraulic resonance frequency fh (0, n) is compared to the alternative hydraulic resonance frequency fh (x, n) for the same hydraulic resonance mode n. If the frequency current hydraulic resonance value fh (0, n) is greater than the alternating hydraulic resonance frequency fh (x, n), the current hydraulic resonance frequency fh (0, n) is recorded in step S604 as a higher frequency fhmax and the alternative hydraulic resonance frequency fh (x, n) as the lower frequency fhmin.
- the current hydraulic resonance frequency fh (0, n) is not greater than the alternating hydraulic resonance frequency fh (x, n)
- the current hydraulic resonance frequency is recorded in step S605 fh (0, n) as the lower frequency fhmin and the alternating hydraulic resonance frequency fh (x, n) as the upper frequency fhmax.
- the counter p is initialized, with the value 1, in the step S606. Then, in step S607, the current mechanical resonance frequency fm (p) is compared to said lower and upper frequencies fhmin and fhmax, to determine if the current mechanical resonance frequency fm (p) is lower than the upper frequency fhmax and greater than the lower frequency fhmin. In the opposite case, in step S608, the value of the counter p is compared with its maximum value P, that is to say with the number P of mechanical resonance modes to be taken into account in this algorithm.
- step S609 a unit is added to the counter p and loopback is returned to step S607 to compare the mechanical resonance frequency for the mode with the lower and upper frequencies fhmin and fhmax. mechanical resonance. If, on the other hand, the maximum value P of the counter p is reached, in step S610 the counter n is compared to its maximum value N, ie to the number N of the hydraulic resonance modes. take into account in this algorithm. If this value N is not reached, in step S611 a unit is added to the counter n and loopback is returned to step S603 to determine the lower and upper frequencies for the next hydraulic resonance mode and then compare them. at mechanical resonance frequencies.
- step S607 If, on the other hand, the maximum value N of the counter n is reached without the comparison of the step S607 having given a positive result for any of the N hydraulic resonance modes and none of the P mechanical resonance modes, a value is recorded. null for a binary signal CRITX (x) in step S612, thereby indicating that the alternative bearing x can be reached from the current bearing without any frequency crossing.
- step S607 the comparison of the present mechanical resonance frequency fm (p) with said lower and upper frequencies fhmin and fhmax gives a positive result, a value S613 is directly recorded. 1 for the binary signal CRITX (x), without continuing the loops corresponding to the counters n and
- step S612 the value of counter x is compared to its maximum value X in step S614. It is thus determined whether each of the X alternative steps has been verified. In the opposite case, a unit is added to the value of the counter X in the step S615, and the initialization step of the counter n is returned to the step S602. On the other hand, if the maximum value X is reached by the counter x, we proceed to the end S616 of the frequency crossing detection algorithm.
- the current step change detection module F25 is configured to detect whether a step transition is currently in progress and generates a CRUT binary signal with a null value if no transition is in progress and a value of 1 if such a transition is well underway.
- the module F25 can for example be based, as illustrated, on a comparison between the values of the current hydraulic resonance frequencies fh (0, n), calculated by the module F1, and the hydraulic resonance frequencies fhc (n). corresponding to the bearing currently selected by the bearing selection module F26 for the same hydraulic resonance modes n.
- the value of the signal CR ⁇ T will then change from zero to one as soon as the differences between the values of the current hydraulic resonance frequencies fh (0, n) and those of the hydraulic resonance frequencies fhc (n) corresponding to the stage currently selected for the same modes.
- hydraulic resonance n will exceed a threshold of uncertainty, and will return to zero as soon as these differences return below this threshold of uncertainty, or a threshold of time since the beginning of the transition has been exceeded.
- the determination of such a transient state of step change can be performed in other ways, such as for example based on time gradients in the frequencies of hydraulic resonance fh (0, n), by observation of the valves 14a to 14d or their control signals, or by observation of the level of liquid in the accumulator 8.
- the bearing selection module F26 is configured to select an operating stage among the X alternating stages and to order the transition of the hydraulic accumulator 8 towards this alternative bearing according to the algorithm illustrated in FIGS. 7 and 8, from the signal CRUT transmitted by the step change detection module F25, CRITX signals (x) transmitted by the frequency crossing detection module F24 and current differences DIFF (0, n, p) and alternatives DIFF (x, n, p) calculated by the second and third calculation modules F21 and F22. Following the departure S700 of this algorithm, it is first checked in step S701 if a first reference criterion is already not filled by the current stage.
- this first reference criterion is a distance D (0) between the set of current hydraulic resonance frequencies fh (0, n) and the set of mechanical resonance frequencies fm (p) is greater than a first threshold Dminl.
- This distance D (0) can for example be calculated as being the smallest difference DIFF (0, n, p). If the current stage fulfills this first reference criterion, no step transition is necessary and the algorithm is immediately interrupted, proceeding to finalization S702. On the other hand, if the current stage does not fulfill this first reference criterion, in step S703 it is proceeded to verify that the value of the signal CRITT, indicating a step transition in progress, is not equal to 1.
- the algorithm is also interrupted, going to the finalization step S702.
- the value of the binary signal CRUT is zero, we go to the initialization step S704, in which the counters i, j and k are initialized with a zero value, the value of a parameter DMAX is initialized with the value of the distance D (0), and the counter x is initialized with a value of 1.
- step S705 it proceeds to check whether the first reference criterion is filled by the alternative bearing x, c ' that is, if the distance D (x), computed in the same way as the distance D (0), but based on the alternative differences Af (x, n, p) corresponding to the level x, is greater than the first threshold Dminl. If this first reference criterion is not fulfilled by the alternate level x, in step S706 a zero value is assigned to the binary signal CRm (x), before checking in step S707 whether the level x fulfills at least a second, less restrictive benchmark.
- this second reference criterion is that the value of the distance D (x) is at least greater than a second threshold Dmin2 less than the first threshold.
- alternative criteria may also be considered for this second benchmark. If this second reference criterion is also not satisfied by the alternate level x, a zero value is assigned to the binary signal CRIT2 (x) and step S709, in which the value of the counter x is checked. is already equal to the number X of alternative levels. If it is not yet the case, a unit is added to the counter x in the step S710 and is looped back to the step S705.
- step S711 the value 1 is assigned to the signal CRIT2 (x) for step x and one unit is added to the counter j. Then, in step S712 it is checked whether the counter k is still at zero and whether the distance D (x) is greater than the value assigned to the parameter DMAX. If both conditions are met, in step S713 the value of the distance D (x) for step x is assigned to this parameter DMAX before proceeding to step S709. Otherwise, go directly to step S709.
- step S714 a value of 1 is assigned to the signal CRIT1 (x) and one unit is added to the counter i. Then, in step S715, it is verified through the value of the signal CRITX (x) that a transition to the alternating stage x is possible without crossing frequencies. If the value of the signal CRITX (x) is not zero, which indicates that the transition to the alternate bearing x involves at least one frequency crossing, proceed to the step S712 previously described.
- step S715 it is verified that the value of the signal CRITX (x) is indeed zero, thus indicating that a transition to the alternating stage x is possible without frequency crossing, it is verified in step S716 if the value of the counter k is still equal to zero or the distance D (x) greater than the value of the comparative parameter DMAX.
- step S717 the value of the distance D (x) is assigned to the parameter DMAX, before proceeding to step S718 in which a unit is added to the counter k, then to step S709 previously described.
- step S718 is directly passed without going through step S717.
- step S709 the state of the counter i is checked in steps S801 and S802. If in these steps S801 and S802 it is verified that the value of the counter i is, respectively, greater than zero and one, thus indicating that a plurality of the alternative steps fills the first reference criterion, the condition is checked.
- counter k in steps S803 and S804. If in these steps S803 and S804 it is verified that the value of the counter k is, respectively, greater than zero and one, thus indicating that several alternative stages, among those fulfilling the first reference criterion, can be reached without frequency crossing.
- the comparative parameter that is to say the distance D (x) in the illustrated embodiment, and the predetermined order of the alternate bearings x can also be used to decide between several alternative levels x fulfilling the first or the second criterion reference when none is accessible without frequency crossing.
- step S802 if in step S802 it has been found that the value of the counter i is greater than unity, which indicates that several alternative levels x fulfill the first reference criterion, but that in step S803 it has been found that the value of the counter k remained zero, which indicates that none of these alternative levels x can be reached without frequency crossing, we proceed to step S810, in which it is checked if more than one step alternative x has a distance D (x) equal to that assigned to the parameter DMAX. In the affirmative case, in step S811, the module F26 proceeds to control the transition of the accumulator 8 to the alternating stage x with a distance D (x) equal to the value of the parameter DMAX and higher rank, and then proceed to the finalization S807.
- step S812 the module F26 proceeds to control the transition of the accumulator 8 to the only alternative stage x whose value of the distance D (x) is therefore equal to the value of the parameter DMAX, for then proceed with finalization S807.
- Step S810 is also reached if in step S801 it has been found that the value of the counter i has remained zero, which indicates that no alternative step x does not fulfill the first reference criterion, and refers to a first mode degraded operation, but that in the next step S813 it is found that the value of the counter j is not zero, which means that at least one alternative step x fulfills the second reference criterion, and that thereafter it is found in step S814 that the distance D (0) corresponding to the current step is less than the value of the parameter DMAX, corresponding to the greater of the distances D (x) among the alternate levels x.
- step S814 it is found that the distance D (0) corresponding to the current step is not less than the value of the parameter DMAX after the first part of this algorithm, or if in step S813 it has been found that the value of the counter j has remained zero, and that no alternative stage thus fulfills even the second reference criterion and that it is then noted in the step S815 that the current stage fulfills this second criterion well. reference criterion, the module F26 then goes directly to S807 finalization of the algorithm without controlling any step transition.
- step S815 it has been found that the current step also does not fulfill the second reference criterion, the module F26 is returned to a second degraded operating mode, in which, in step S816, it controls a rapidly alternating transition between at least two different stages to try to avoid further triggering of the POGO effect despite the proximity of the hydraulic and mechanical resonance frequencies.
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Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15778367.1A EP3201460B1 (fr) | 2014-09-30 | 2015-09-21 | Procede de suppression d'effet pogo. |
JP2017517255A JP2017534792A (ja) | 2014-09-30 | 2015-09-21 | ポゴ効果を抑制する方法 |
CN201580052756.3A CN107110069A (zh) | 2014-09-30 | 2015-09-21 | 用于消除纵向振动效应的方法 |
RU2017114730A RU2017114730A (ru) | 2014-09-30 | 2015-09-21 | Способ пресечения эффекта пого |
US15/515,423 US10914268B2 (en) | 2014-09-30 | 2015-09-21 | Method for suppressing the pogo effect |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1459254 | 2014-09-30 | ||
FR1459254A FR3026440B1 (fr) | 2014-09-30 | 2014-09-30 | Procede de suppression d'effet pogo |
Publications (1)
Publication Number | Publication Date |
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WO2016051047A1 true WO2016051047A1 (fr) | 2016-04-07 |
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ID=52824292
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/FR2015/052520 WO2016051047A1 (fr) | 2014-09-30 | 2015-09-21 | Procede de suppression d'effet pogo. |
Country Status (7)
Country | Link |
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US (1) | US10914268B2 (fr) |
EP (1) | EP3201460B1 (fr) |
JP (1) | JP2017534792A (fr) |
CN (1) | CN107110069A (fr) |
FR (1) | FR3026440B1 (fr) |
RU (1) | RU2017114730A (fr) |
WO (1) | WO2016051047A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018096244A1 (fr) * | 2016-11-28 | 2018-05-31 | Arianegroup Sas | Systeme correcteur d'effet pogo |
JP2020513498A (ja) * | 2016-12-02 | 2020-05-14 | アリアーヌグループ ソシエテ パ アクシオンス シンプリフィエ | ポゴ効果補正システム |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3067408B1 (fr) * | 2017-06-08 | 2019-07-26 | Airbus Safran Launchers Sas | Procede de commande ameliore pour moteur d'engin spatial |
FR3070441B1 (fr) * | 2017-08-24 | 2021-06-18 | Arianegroup Sas | Systeme d'alimentation ameliore pour l'alimentation de moteur-fusee |
CN109322764B (zh) * | 2018-10-17 | 2019-11-12 | 北京宇航***工程研究所 | 一种低温液位可控注气式蓄压器 |
DE102019110258A1 (de) | 2019-04-15 | 2020-10-15 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Injektorvorrichtung für eine Triebwerksvorrichtung, Triebwerksvorrichtung und Luft- und/oder Raumfahrzeug |
CN111852690B (zh) * | 2020-07-07 | 2021-08-17 | 西安航天动力试验技术研究所 | 一种大推力火箭发动机地面试验用的低频脉动抑制装置 |
CN117536733B (zh) * | 2023-10-19 | 2024-08-13 | 北京天兵科技有限公司 | 一种大型液体运载火箭pogo抑制***及输送*** |
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US4039000A (en) * | 1975-12-18 | 1977-08-02 | Nasa | Accumulator |
FR2499641A1 (fr) * | 1981-02-06 | 1982-08-13 | Europ Propulsion | Dispositif a accumulateur hydraulique pour la limitation des contraintes appliquees a une canalisation d'alimentation en fluide |
JPH03287498A (ja) * | 1990-04-04 | 1991-12-18 | Mitsubishi Heavy Ind Ltd | 液体燃料ロケットのポゴ抑止装置 |
WO2012156615A2 (fr) | 2011-05-17 | 2012-11-22 | Snecma | Systeme d'alimentation et procede de suppression d'effet pogo |
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US7752833B2 (en) | 2006-01-10 | 2010-07-13 | General Electric Company | Methods and apparatus for gas turbine fuel control |
EP2472448A1 (fr) * | 2010-12-28 | 2012-07-04 | Hasso-Plattner-Institut für Softwaresystemtechnik GmbH | Protocole de communication pour service de découverte sensible à la communication |
US20130312706A1 (en) * | 2012-05-23 | 2013-11-28 | Christopher J. Salvador | Fuel system having flow-disruption reducer |
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- 2014-09-30 FR FR1459254A patent/FR3026440B1/fr not_active Expired - Fee Related
-
2015
- 2015-09-21 WO PCT/FR2015/052520 patent/WO2016051047A1/fr active Application Filing
- 2015-09-21 EP EP15778367.1A patent/EP3201460B1/fr active Active
- 2015-09-21 US US15/515,423 patent/US10914268B2/en active Active
- 2015-09-21 JP JP2017517255A patent/JP2017534792A/ja active Pending
- 2015-09-21 RU RU2017114730A patent/RU2017114730A/ru not_active Application Discontinuation
- 2015-09-21 CN CN201580052756.3A patent/CN107110069A/zh active Pending
Patent Citations (5)
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FR2161794A1 (fr) * | 1971-11-30 | 1973-07-13 | Onera (Off Nat Aerospatiale) | |
US4039000A (en) * | 1975-12-18 | 1977-08-02 | Nasa | Accumulator |
FR2499641A1 (fr) * | 1981-02-06 | 1982-08-13 | Europ Propulsion | Dispositif a accumulateur hydraulique pour la limitation des contraintes appliquees a une canalisation d'alimentation en fluide |
JPH03287498A (ja) * | 1990-04-04 | 1991-12-18 | Mitsubishi Heavy Ind Ltd | 液体燃料ロケットのポゴ抑止装置 |
WO2012156615A2 (fr) | 2011-05-17 | 2012-11-22 | Snecma | Systeme d'alimentation et procede de suppression d'effet pogo |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018096244A1 (fr) * | 2016-11-28 | 2018-05-31 | Arianegroup Sas | Systeme correcteur d'effet pogo |
FR3059369A1 (fr) * | 2016-11-28 | 2018-06-01 | Airbus Safran Launchers Sas | Systeme correcteur d'effet pogo |
JP2020513498A (ja) * | 2016-12-02 | 2020-05-14 | アリアーヌグループ ソシエテ パ アクシオンス シンプリフィエ | ポゴ効果補正システム |
JP6997185B2 (ja) | 2016-12-02 | 2022-01-17 | アリアーヌグループ ソシエテ パ アクシオンス シンプリフィエ | ポゴ効果補正システム |
Also Published As
Publication number | Publication date |
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JP2017534792A (ja) | 2017-11-24 |
US10914268B2 (en) | 2021-02-09 |
EP3201460A1 (fr) | 2017-08-09 |
US20170226965A1 (en) | 2017-08-10 |
FR3026440B1 (fr) | 2016-10-14 |
EP3201460B1 (fr) | 2018-07-18 |
FR3026440A1 (fr) | 2016-04-01 |
RU2017114730A (ru) | 2018-11-02 |
CN107110069A (zh) | 2017-08-29 |
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