Method and device for determining the angle of a wobble hose steel wire braid

Abstract

The application discloses a method and device for determining a weaving angle of a swing hose steel wire, and the method comprises the following steps: acquiring the medium internal pressure of the swing hose, the steel wire distribution circle diameter, the wave tube pass diameter, the steel wire diameter, the initial length of each steel wire, and the initial length of the swing hose; then determining a first function relationship and a second function relationship according to the medium internal pressure of the swing hose, the steel wire distribution circle diameter, the wave tube pass diameter, the steel wire diameter, the initial length of each steel wire, and the initial length of the swing hose; and then determining a target steel wire winding angle according to the first function relationship and the second function relationship, so as to calculate the weaving angle of the steel wire. In this way, the engine swing load torque caused by the bending of the swing hose is reduced, the stress uniformity of the steel wire mesh of the swing hose is improved, the carrying capacity is improved, and the service life of the swing hose is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rocket engine, and particularly relates to a method and device for determining the weaving angle of a swing hose steel wire. BACKGROUND

[0002] With the mature reuse of the Falcon 9 rocket of the American SpaceX company, the reusable liquid rocket technology with multiple engines in parallel has become a development trend. The technical scheme requires that the outer contour of the liquid rocket engine is as small as possible so as to arrange more engines in the same space. The pump-after-swing scheme can effectively reduce the swing space of the engine, and gradually becomes the preferred scheme of the reusable rocket engine.

[0003] The swing hose is used to compensate for the pipeline deformation generated in the engine swing process. The pump-after-swing engine swing hose compensates for the pipeline deformation by bending, and the swing hose also needs to withstand the axial force generated by the internal pressure of the medium. The pump-after-swing engine swing hose mainly has two schemes of steel wire mesh sleeve bellows and gimbal bellows, wherein the steel wire mesh sleeve bellows scheme has the advantages of simple manufacturing, low cost, small size, light weight and the like. The weaving angle of the steel wire mesh sleeve of the ordinary metal hose is generally about 45°, and the steel wire mesh sleeve swing hose for the engine generally follows the experience of the ordinary metal hose.

[0004] However, the steel wire mesh sleeve swing hose withstands the axial force generated by the internal pressure of the medium, and if the steel wire mesh sleeve parameters are not matched properly during the engine swing process, the steel wire will be unevenly stressed, the carrying capacity of the steel wire mesh sleeve will be reduced, and the engine swing servo load torque will be increased. SUMMARY

[0005] In view of the above problems, the present application is proposed to provide a method and device for determining the weaving angle of a swing hose steel wire, which can reduce the engine swing load torque caused by the bending of the swing hose, improve the uniformity of the stress of the steel wire mesh sleeve swing hose, improve the carrying capacity thereof, and thus improve the service life of the swing hose.

[0006] According to a first aspect of the present application, a method for determining the weaving angle of a swing hose steel wire is provided, which is applied to the steel wire mesh sleeve of a liquid rocket engine swing hose, and the method comprises the following steps:

[0007] obtaining the internal pressure of the medium of the swing hose, the steel wire distribution circle diameter, the bellows pass diameter, the steel wire diameter, the initial length of each steel wire, and the initial length of the swing hose;

[0008] Determine a first function relationship and a second function relationship according to the internal pressure of the swing hose, the steel wire distribution circle diameter, the corrugated pipe pass diameter, the steel wire diameter, the initial length of each steel wire, and the initial length of the swing hose, wherein the first function relationship is a function relationship between the stress of the steel wire with the largest elongation and the steel wire winding angle after the steel wire is loaded, and the second function relationship is a function relationship between the bending moment generated when the swing hose is bent and the steel wire winding angle.

[0009] Determine a target steel wire winding angle according to the first function relationship and the second function relationship, so as to calculate the steel wire weaving angle.

[0010] Optionally, the determining of the first function relationship and the second function relationship according to the internal pressure of the swing hose, the steel wire distribution circle diameter, the corrugated pipe pass diameter, the steel wire diameter, the initial length of each steel wire, and the initial length of the swing hose comprises:

[0011] Determine the steel wire bending length of each steel wire after the swing hose is bent.

[0012] Determine the equivalent diameter of the corrugated pipe according to the steel wire distribution circle diameter, the corrugated pipe pass diameter, and the steel wire diameter.

[0013] Determine a first mapping relationship between the elongation of the swing hose and the steel wire winding angle according to the equivalent diameter of the corrugated pipe, the internal pressure, the initial length of the steel wire, the steel wire diameter, the steel wire bending length, and the initial length of the swing hose.

[0014] Determine a second mapping relationship between the steel wire loading length of the loaded steel wire and the steel wire winding angle according to the first mapping relationship and the steel wire bending length.

[0015] Determine a third mapping relationship between the equivalent elongation of all the steel wires and the steel wire winding angle according to the second mapping relationship and the initial length of the steel wire.

[0016] Determine the first function relationship according to the second mapping relationship, the third mapping relationship, and the equivalent diameter of the corrugated pipe.

[0017] Determine the second function relationship according to the internal pressure, the equivalent diameter of the corrugated pipe, the initial length of the steel wire, the first mapping relationship, the second mapping relationship, and the third mapping relationship.

[0018] Optionally, the determining of the equivalent diameter of the corrugated pipe according to the steel wire distribution circle diameter, the corrugated pipe pass diameter, and the steel wire diameter comprises:

[0019] The equivalent diameter of the corrugated pipe is determined according to the steel wire distribution circle diameter, the corrugated pipe pass diameter, and the steel wire diameter through the following formula:

[0020]

[0021] wherein D dl is the equivalent diameter of the bellows, D is the distribution circle diameter of the steel wire, d is the pass diameter of the bellows, d gs is the diameter of the steel wire.

[0022] Optionally, the first mapping relationship between the elongation of the swing hose and the steel wire winding angle is determined according to the equivalent diameter of the bellows, the medium internal pressure, the initial length of the steel wire, the diameter of the steel wire, the bending length of the steel wire, and the initial length of the swing hose, and includes:

[0023] The first mapping relationship between the elongation of the swing hose and the steel wire winding angle is determined according to the equivalent diameter of the bellows, the medium internal pressure, the initial length of the steel wire, the diameter of the steel wire, the bending length of the steel wire, and the initial length of the swing hose by the following formula:

[0024]

[0025] γ=atan(βD / 2L)

[0026] wherein ΔL is the elongation of the swing hose, F is the axial load borne by the single layer of steel wire, L0 is the initial length of the steel wire, n is the number of steel wires in the single layer of steel wire, E is the material elastic coefficient, d gs is the diameter of the steel wire, L w，i is the bending length of the steel wire, γ is the steel wire weaving angle, β is the steel wire winding angle, D is the distribution circle diameter of the steel wire, and L is the initial length of the swing hose.

[0027] Optionally, the second mapping relationship between the steel wire bearing length of the bearing steel wire and the steel wire winding angle is determined according to the first mapping relationship and the bending length of the steel wire, and includes:

[0028] The second mapping relationship between the bearing length of the bearing steel wire and the steel wire winding angle is determined according to the first mapping relationship and the bending length of the steel wire by the following formula:

[0029] L g,i =L w,i +ΔL

[0030] wherein L g,i is the bearing length of the steel wire, L w，i is the bending length of the steel wire, and ΔL is the elongation of the swing hose.

[0031] Optionally, the third mapping relationship between the equivalent elongation of all the steel wires and the steel wire winding angle is determined according to the second mapping relationship and the initial length of the steel wire, and includes:

[0032] According to the second mapping relationship, the steel wire initial length, a third mapping relationship between equivalent elongation of all steel wires and the steel wire winding angle is determined by the following formula:

[0033]

[0034] Wherein, ΔL dx is the equivalent elongation of all steel wires, L g,i is the steel wire bearing length of the bearing steel wire, L0 is the steel wire initial length, and n is the steel wire root number of the single layer steel wire.

[0035] Optionally, the first function relationship between the maximum elongation steel wire stress and the steel wire winding angle is determined according to the second mapping relationship, the third mapping relationship and the bellows equivalent diameter, and the first function relationship comprises:

[0036] According to the second mapping relationship, the third mapping relationship and the bellows equivalent diameter, a first function relationship between the maximum elongation steel wire stress and the steel wire winding angle is determined by the following formula:

[0037]

[0038]

[0039]

[0040] γ=atan(βD / 2L)

[0041] Wherein, σ gs,max is the maximum elongation steel wire stress, F gs,max is the tension of the maximum elongation steel wire, F z,max is the axial tension of the swing hose of the maximum elongation steel wire, ΔL dx is the equivalent elongation of all steel wires, ΔL is the elongation of the swing hose, F is the axial load of the single layer steel wire, γ is the steel wire weaving angle, d gs is the steel wire diameter, β is the steel wire winding angle, D is the steel wire distribution circle diameter, and L is the swing hose initial length.

[0042] Optionally, the second function relationship is determined according to the medium internal pressure, the bellows equivalent diameter, the steel wire initial length, the first mapping relationship, the second mapping relationship and the mapping relationship, and the second function relationship comprises:

[0043] According to the medium internal pressure, the bellows equivalent diameter, the steel wire initial length, the first mapping relationship, the second mapping relationship and the mapping relationship, a second function relationship is determined by the following formula:

[0044] γ = atan (βD / 2L)

[0045]

[0046] wherein M is the bending moment, F is the axial load borne by the single layer of steel wires, ΔL is the elongation of the hose, ΔL dx is the equivalent elongation of all the steel wires, D is the diameter of the distribution circle of the steel wires, β is the winding angle of the steel wires, γ is the weaving angle of the steel wires, θ i is the initial phase angle of the i-th steel wire, L is the initial length of the hose, L g,i is the length of the steel wires, L0 is the initial length of the steel wires, and n is the number of the steel wires of the single layer.

[0047] According to a second aspect of the present application, a device for determining the weaving angle of the steel wires of a hose is provided, comprising:

[0048] a data acquisition module configured to acquire the internal pressure of the hose, the diameter of the distribution circle of the steel wires, the diameter of the hose, the diameter of the steel wires, the initial length of the steel wires, and the initial length of the hose;

[0049] a function determination module configured to determine a first function relationship and a second function relationship according to the internal pressure of the hose, the diameter of the distribution circle of the steel wires, the diameter of the hose, the diameter of the steel wires, the initial length of the steel wires, and the initial length of the hose, wherein the first function relationship is the function relationship between the stress of the steel wire with the largest elongation and the winding angle of the steel wire after the steel wire bears the load, and the second function relationship is the function relationship between the bending moment generated when the hose bends and the winding angle of the steel wire;

[0050] a weaving angle determination module configured to determine the target winding angle of the steel wire according to the first function relationship and the second function relationship, so as to calculate the weaving angle of the steel wire.

[0051] According to a third aspect of the present application, an electronic device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the hose steel wire weaving angle determination method when executing the computer program.

[0052] The one or more technical solutions in the embodiments of the present application have at least the following technical effects:

[0053] The embodiment of the present specification provides a swing hose steel wire weaving angle determination method and device, the medium internal pressure of the swing hose, the steel wire distribution circle diameter, the wave tube drift diameter, the steel wire diameter, the steel wire initial length of each steel wire, the swing hose initial length are acquired; then the first function relationship and the second function relationship are determined according to the medium internal pressure of the swing hose, the steel wire distribution circle diameter, the wave tube drift diameter, the steel wire diameter, the steel wire initial length of each steel wire, the swing hose initial length, the first function relationship is the function relationship between the stress of the steel wire with the maximum elongation after the steel wire bearing and the steel wire coiling angle; the second function relationship is the function relationship between the bending moment generated when the swing hose bends and the steel wire coiling angle; then the target steel wire coiling angle is determined according to the first function relationship and the second function relationship, so as to calculate the steel wire weaving angle. In this way, while reducing the engine swing load moment caused by the bending of the swing hose, the stress uniformity of the steel wire mesh swing hose is improved, the carrying capacity is improved, and the service life of the swing hose is improved.

[0054] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, the content of the specification can be implemented, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0055] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered as limiting the present application. Moreover, the same reference numerals are used to represent the same components throughout the drawings.

[0056] In the drawings:

[0057] Figure 1 A flow chart of a swing hose steel wire weaving angle determination method in an embodiment of the present application is shown.

[0058] Figure 2 A steel wire mesh swing hose structure schematic diagram in an embodiment of the present application is shown.

[0059] Figure 3 A steel wire winding around the swing hose axis coiling schematic diagram in an embodiment of the present application is shown.

[0060] Figure 4 A steel wire mesh swing hose structure schematic diagram in an embodiment of the present application is shown.

[0061] Figure 5 A stress of the steel wire with the maximum carrying capacity and the steel wire coiling angle β relationship curve schematic diagram in an embodiment of the present application is shown.

[0062] Figure 6 A curve showing the relationship between the bending moment of the swinging hose and the wire winding angle β caused by uneven force of the steel wire in the embodiment of the present application is shown.

[0063] Figure 7 A coordinate system diagram in the embodiment of the present application is shown.

[0064] Figure 8 A swinging hose bending diagram in the embodiment of the present application is shown.

[0065] Figure 9 A steel wire initial phase angle diagram in the embodiment of the present application is shown.

[0066] Figure 10 A swinging hose end face force diagram in the embodiment of the present application is shown. DETAILED DESCRIPTION

[0067] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0068] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0069] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0070] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms “setting”, “mounting”, “connecting”, “connecting” should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0071] The embodiment provides an electronic device. The electronic device can include a swing hose steel wire weaving angle determination apparatus, a memory, a processor and a communication unit, the memory stores machine readable instructions executable by the processor, when the electronic device is running, the processor and the memory communicate through a bus, the processor executes the machine readable instructions, and the swing hose steel wire weaving angle determination method is executed.

[0072] The memory, the processor and the communication unit are electrically connected with each other directly or indirectly to realize the transmission or interaction of signals. For example, the elements can be electrically connected with each other through one or more communication buses or signal lines. The swing hose steel wire weaving angle determination apparatus includes at least one software function module stored in the memory in the form of software or firmware. The processor is used to execute the executable modules (for example, the software function modules or computer programs included in the swing hose steel wire weaving angle determination apparatus 10) stored in the memory.

[0073] The memory can be, but is not limited to, a random access memory (RAM), a read only memory (ROM), a programmable read only memory (PROM), an erasable programmable read only memory (EPROM), an electric erasable programmable read only memory (EEPROM) and the like.

[0074] In some embodiments, the processor is configured to perform one or more functions described in the embodiments. In some embodiments, the processor can include one or more processing cores (e.g., a single-core processor (S) or a multi-core processor (S)). For example only, the processor can include a central processing unit (CPU), an application specific integrated circuit (ASIC), an application specific instruction-set processor (ASIP), a graphics processing unit (GPU), a physics processing unit (PPU), a digital signal processor (DSP), a field programmable gate array (FPGA), a programmable logic device (PLD), a controller, a microcontroller unit, a reduced instruction set computer (RISC), or a microprocessor, etc., or any combination thereof.

[0075] For ease of illustration, only one processor is described in the electronic device. However, it should be noted that the electronic device in the embodiments can also include multiple processors, and thus the steps performed by one processor described in the embodiments can also be jointly performed or separately performed by multiple processors. For example, if the processor of the server performs steps A and B, it should be understood that steps A and B can also be jointly performed by two different processors or separately performed in one processor. For example, the processor performs step A, the second processor performs step B, or the processor and the second processor jointly perform steps A and B.

[0076] In the embodiments, the memory is configured to store a program, and the processor is configured to execute the program after receiving an execution instruction. The method defined by the flow disclosed in any of the embodiments can be applied in the processor or implemented by the processor.

[0077] The communication unit is configured to establish a communication connection between the electronic device and other devices through a network, and to transmit and receive data through the network.

[0078] In some embodiments, the network can be any type of wired or wireless network, or a combination thereof. By way of example only, the network can include a wired network, a wireless network, a fiber optic network, a telecommunications network, an intranet, the Internet, a Local Area Network (LAN), a Wide Area Network (WAN), a Wireless Local Area Network (WLAN), a Metropolitan Area Network (MAN), a Wide Area Network (WAN), a Public Switched Telephone Network (PSTN), a Bluetooth network, a ZigBee network, or a Near Field Communication (NFC) network, among others, or any combination thereof.

[0079] In the present embodiment, the electronic device can be, but is not limited to, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a Personal Digital Assistant (PDA), and the like. The present embodiment does not limit the specific type of the electronic device.

[0080] In combination Figure 1 As shown, the present embodiment further provides a method for determining the weaving angle of a swing hose, which is applied to the wire mesh cover of a swing hose of a liquid rocket engine. The method comprises steps 101 to 103.

[0081] Step 101: obtaining the medium internal pressure of the swing hose, the wire distribution circle diameter, the wave tube pass diameter, the wire diameter, the initial length of each wire, and the initial length of the swing hose.

[0082] It should be explained that the engine swing controls the attitude of the rocket, and the servo mechanism is used to push the engine to swing. The swing hose is connected with the engine. The medium enters the engine through the swing hose, and the medium can be liquid fuel. The engine swing will cause the swing hose to bend, and the medium in the swing hose will also generate a medium internal pressure.

[0083] In combination Figure 2The steel wire mesh sleeve swing hose structure schematic diagram is shown in the figure, the steel wire mesh sleeve swing hose mainly includes steel wire mesh sleeve 1, corrugated pipe 2, reinforcing ring 3, welding joint 4. Steel wire mesh sleeve is mainly used to bear the axial load generated by medium pressure, corrugated pipe plays a sealing role, and together with the reinforcing ring, it bears the radial load generated by the internal pressure of the medium. The internal pressure of the swing hose, the diameter of the steel wire distribution circle, the diameter of the corrugated pipe, the diameter of the steel wire, the initial length of each steel wire, the initial length of the swing hose, and the number of steel wire layers, the number of steel wires in each layer, and the elastic coefficient of the steel wire material are obtained. These basic data can be directly obtained.

[0084] Step 102: determining a first function relationship and a second function relationship according to the internal pressure of the swing hose, the diameter of the steel wire distribution circle, the diameter of the corrugated pipe, the diameter of the steel wire, the initial length of each steel wire, and the initial length of the swing hose, the first function relationship is the function relationship between the stress of the steel wire with the largest elongation and the steel wire winding angle after the steel wire bears the load; the second function relationship is the function relationship between the bending moment generated when the swing hose bends and the steel wire winding angle;

[0085] After obtaining the above basic data, two function relationships need to be established, that is, the function relationship between the stress of the steel wire with the largest elongation and the steel wire winding angle, and the function relationship between the bending moment generated when the swing hose bends and the steel wire winding angle. These two function relationships can be regarded as the conditions for restricting the steel wire winding angle, and the ideal steel wire winding angle can be determined according to the first function relationship and the second function relationship.

[0086] Step 103: determining the target steel wire winding angle according to the first function relationship and the second function relationship, so as to calculate the steel wire weaving angle.

[0087] These two function relationships can be regarded as the conditions for restricting the steel wire winding angle, and the ideal steel wire winding angle, that is, the target steel wire winding angle, can be determined according to the first function relationship and the second function relationship. The target steel wire winding angle represents that the bending moment of the swing hose generated by the bearing steel wire is within a certain range of requirements, and the stress of the steel wire with the largest elongation is the smallest. Combined with Figure 5 、 Figure 6 as shown.

[0088] It needs to be explained that after the steel wire winding angle is determined, the steel wire weaving angle can be calculated. Combined with Figure 4 as shown, the steel wire weaving angle and the steel wire winding angle have a conversion relationship, which can be obtained by the following formula:

[0089] γ=atan(βD / 2L)

[0090] Wherein, γ is the steel wire weaving angle, β is the steel wire winding angle, D is the diameter of the steel wire distribution circle, and L is the initial length of the swing hose.

[0091] In an alternative embodiment, determining the first function relationship and the second function relationship can comprise the following steps:

[0092] After the swing hose is bent, the steel wire bending length of each steel wire is determined;

[0093] According to the steel wire distribution circle diameter, the bellows pass diameter, and the steel wire diameter, a bellows equivalent diameter is determined;

[0094] According to the bellows equivalent diameter, the medium internal pressure, the steel wire initial length, the steel wire diameter, the steel wire bending length, and the swing hose initial length, a first mapping relationship between the elongation of the swing hose and the steel wire winding angle is determined;

[0095] According to the first mapping relationship and the steel wire bending length, a second mapping relationship between the steel wire bearing length of the bearing steel wire and the steel wire winding angle is determined;

[0096] According to the second mapping relationship and the steel wire initial length, a third mapping relationship between the equivalent elongation of all steel wires and the steel wire winding angle is determined;

[0097] According to the second mapping relationship, the third mapping relationship, and the bellows equivalent diameter, the first function relationship is determined;

[0098] According to the medium internal pressure, the bellows equivalent diameter, the steel wire initial length, the first mapping relationship, the second mapping relationship, and the mapping relationship, the second function relationship is determined.

[0099] Specifically, the number of layers N of the steel wire mesh sleeve is determined according to the bearing requirement. The steel wire diameter is small, and the difference in bearing between different layers of steel wires is represented by a bearing uniformity coefficient. In the following calculation of steel wire length and stress, the difference in distribution circle diameter of different layers of steel wires is ignored, and the innermost layer of steel wire is taken as a representative for analysis. The braiding process of a single layer of steel wire mesh sleeve also affects the steel wire length and local stress, which is ignored here, and the steel wire shape is considered as an ideal spiral line rotating around the bellows. Only the influence of different braiding angles on steel wire stress and swing hose bending moment is compared and analyzed.

[0100] In detail, a coordinate system as shown in Figure 7 is established. The initial lengths of the steel wires are the same, and a steel wire with a starting point position of (0, 0, D / 2) is selected for analysis, where D is the steel wire distribution circle diameter, and the trajectory equation is

[0101]

[0102] Where: L is the initial length of the wobble hose (flexible part); D is the diameter of the wire distribution circle; β is the angle of the wire winding around the axis of the wobble hose, as shown in Figure 3 ; and t is the control variable.

[0103] The initial length of the wire is

[0104]

[0105] When the wobble hose is bent as shown in Figure 8 , the bending radius is:

[0106]

[0107] Where: α is the bending angle of the wobble hose.

[0108] At this time, without considering the force on the wire, the trajectory equation of the ith wire is: Figure 9

[0109]

[0110] Where: θ i is the initial phase angle of the ith wire, as shown in Figure 8 .

[0111] The length of the ith wire is:

[0112]

[0113] However, the structural characteristics of the wire determine its tensile resistance and compression resistance, so the length of the longest wire in all the wires should be L0. The actual length of the ith wire is:

[0114] L w,i = L wl,i + L0―max(L w,l )

[0115] For the wire with a length less than L0, it does not mean that the wire is shortened after the wobble hose is bent, but it means that the ith wire is elongated when the length is greater than L0―L w,i .

[0116] When the wobble hose is bent at an angle α and bears the internal pressure P of the medium, not all wires necessarily bear the load. For the wires that bear the load, their length is equal to L w,i plus the elongation of the wire under the load.

[0117] The equivalent diameter of the corrugated pipe is determined by the following formula:

[0118]

[0119] ​The axial load generated by the medium internal pressure is:

[0120]

[0121] The axial load borne by the single layer of steel wires is:

[0122]

[0123] Wherein, D dl is the equivalent diameter of the corrugated pipe, D is the distribution circle diameter of the steel wires, d is the pass diameter of the corrugated pipe, d gs is the diameter of the steel wires, F total is the axial load generated by the medium internal pressure, P is the medium internal pressure, F is the axial load borne by the single layer of steel wires, and N is the layer number of the steel wires.

[0124] A first mapping relationship between the elongation of the swing hose and the steel wire winding angle is determined by the following formula:

[0125]

[0126] γ = atan (βD / 2L)

[0127] Wherein, ΔL is the elongation of the swing hose, F is the axial load borne by the single layer of steel wires, L0 is the initial length of the steel wires, n is the number of steel wire roots of the single layer of steel wires, E is the material elastic coefficient, d gs is the diameter of the steel wires, L w，i is the bending length of the steel wires, and γ is the steel wire weaving angle, β is the steel wire winding angle, D is the distribution circle diameter of the steel wires, and L is the initial length of the swing hose.

[0128] It should be noted that the steel wire weaving angle and the steel wire winding angle have a conversion relationship, and ΔL can finally be changed into an expression related to the steel wire winding angle β.

[0129] A second mapping relationship between the bearing length of the bearing steel wires and the steel wire winding angle is determined by the following formula, including:

[0130] L g,i = L w,i + ΔL

[0131] Wherein, L g,i is the bearing length of the steel wires, L w，i is the bending length of the steel wires, and ΔL is the elongation of the swing hose.

[0132] The bearing steel wire length satisfies the following formula at this time, and this condition can be used as a judgment basis for calculating the number of bearing steel wires.

[0133] L g,i > L0

[0134] The effective elongation of each bearing steel wire is different, and the steel wire with the largest elongation (original length of steel wire) is taken as a reference to calculate the equivalent elongation of all steel wires, so as to obtain the tension of the steel wire with the largest elongation, and further to calculate the tension of all bearing steel wires.

[0135] The third mapping relationship between the equivalent elongation of all steel wires and the winding angle of the steel wire is determined by the following formula:

[0136]

[0137] wherein, ΔL dx is the equivalent elongation of all steel wires, L g,i is the bearing length of the bearing steel wire, L0 is the initial length of the steel wire, and n is the number of steel wire roots of the single layer of steel wire.

[0138] Then, according to the second mapping relationship, the third mapping relationship and the equivalent diameter of the bellows, the first functional relationship between the stress of the steel wire with the largest elongation and the winding angle of the steel wire is determined by the following formula, including:

[0139]

[0140]

[0141]

[0142] γ=atan(βD / 2L)

[0143] In the bearing steel wire, the axial tension of the i-th steel wire of the swing hose is:

[0144]

[0145] wherein, σ gs,max is the stress of the steel wire with the largest elongation, F gs,max is the tension of the steel wire with the largest elongation, F z,max is the axial tension of the swing hose borne by the steel wire with the largest elongation, ΔL dx is the equivalent elongation of all steel wires, ΔL is the elongation of the swing hose, F is the axial load borne by the single layer of steel wire, γ is the weaving angle of the steel wire, d gs is the diameter of the steel wire, β is the winding angle of the steel wire, D is the diameter of the distribution circle of the steel wire, L is the initial length of the swing hose, and F z,i is the axial tension of the swing hose borne by the i-th steel wire.

[0146] In combination with Figure 10As shown, according to the medium internal pressure, the corrugated pipe equivalent diameter, the steel wire initial length, the first mapping relationship, the second mapping relationship and the mapping relationship, a second function relationship is determined by the following formula:

[0147] γ = atan (βD / 2L)

[0148]

[0149] Wherein, M is the bending moment, F is the axial load borne by the single layer steel wire, ΔL is the elongation of the swing hose, ΔL dx is the equivalent elongation of all steel wires, D is the steel wire distribution circle diameter, β is the steel wire winding angle, γ is the steel wire weaving angle, θ i is the initial phase angle of the i-th steel wire, L is the initial length of the swing hose, L g,i is the steel wire bearing length, L0 is the steel wire initial length, and n is the number of steel wires in the single layer.

[0150] By combining the above formulas, the maximum stress of the steel wire (i.e. the stress of the steel wire with the maximum elongation) can be obtained. The stress is compared with the allowable stress of the steel wire, and in combination with the bending moment, a more ideal steel wire winding angle can be determined. It can be used to judge the allowable life of the swing hose.

[0151] Taking an actual data as an example, taking a swing hose with a corrugated pipe diameter of 80 mm, a steel wire distribution circle diameter of 110 mm and a length of 200 mm as an example, two layers of steel wire mesh are used, the steel wire mesh has a space ratio of about 0.85 (the number of steel wires is rounded down), the steel wire diameter is 1 mm, and the medium internal pressure is 20 MPa. When the steel wire winding angle β changes in the range of [0, 360°], the maximum stress of the steel wire is as shown in Figure 5 , and the bending moment of the swing hose caused by the uneven stress of the steel wire is as shown in Figure 6 It can be seen that when the steel wire winding angle β is 360°, the stress of the steel wire is the smallest, and the bending moment of the swing hose caused by the uneven stress of the steel wire is 0. It needs to be explained that when the basic data changes, Figure 5 , the bending moment is still 0 when the steel wire winding angle is 180 degrees and 360 degrees. However, the steel wire winding angle corresponding to the minimum steel wire stress is not necessarily 360 degrees. Specifically, the range of the steel wire winding angle needs to be obtained according to the required range of the bending moment, and then the winding angle of the steel wire with the minimum stress is determined in the range of the steel wire winding angle, and finally the corresponding steel wire weaving angle is calculated.

[0152] In summary, the embodiment of the present specification provides a method for determining the weaving angle of the steel wire of the swing hose, which obtains the internal pressure of the medium of the swing hose, the diameter of the steel wire distribution circle, the pass diameter of the bellows, the diameter of the steel wire, the initial length of each steel wire, and the initial length of the swing hose. Then, according to the internal pressure of the medium of the swing hose, the diameter of the steel wire distribution circle, the pass diameter of the bellows, the diameter of the steel wire, the initial length of each steel wire, and the initial length of the swing hose, a first function relationship and a second function relationship are determined. The first function relationship is the function relationship between the stress of the steel wire with the largest elongation and the winding angle of the steel wire after the steel wire bears the load. The second function relationship is the function relationship between the bending moment generated when the swing hose bends and the winding angle of the steel wire. Then, according to the first function relationship and the second function relationship, the target winding angle of the steel wire is determined to calculate the weaving angle of the steel wire. In this way, while reducing the engine swing load moment caused by the bending of the swing hose, the stress uniformity of the steel wire mesh of the swing hose is improved, the carrying capacity is improved, and the service life of the swing hose is improved.

[0153] Based on the same inventive concept, the embodiment of the present application also provides a device for determining the weaving angle of the steel wire of the swing hose, which comprises:

[0154] A data acquisition module is configured to obtain the internal pressure of the medium of the swing hose, the diameter of the steel wire distribution circle, the pass diameter of the bellows, the diameter of the steel wire, the initial length of each steel wire, and the initial length of the swing hose.

[0155] A function determination module is configured to determine a first function relationship and a second function relationship according to the internal pressure of the medium of the swing hose, the diameter of the steel wire distribution circle, the pass diameter of the bellows, the diameter of the steel wire, the initial length of each steel wire, and the initial length of the swing hose. The first function relationship is the function relationship between the stress of the steel wire with the largest elongation and the winding angle of the steel wire after the steel wire bears the load. The second function relationship is the function relationship between the bending moment generated when the swing hose bends and the winding angle of the steel wire.

[0156] A weaving angle determination module is configured to determine the target winding angle of the steel wire according to the first function relationship and the second function relationship to calculate the weaving angle of the steel wire.

[0157] The embodiment of the present specification provides a swing hose steel wire weaving angle determination device. The swing hose steel wire weaving angle determination device is determined by obtaining the medium internal pressure of the swing hose, the steel wire distribution circle diameter, the bellows pass diameter, the steel wire diameter, the steel wire initial length of each steel wire, and the swing hose initial length. Then, according to the medium internal pressure of the swing hose, the steel wire distribution circle diameter, the bellows pass diameter, the steel wire diameter, the steel wire initial length of each steel wire, and the swing hose initial length, a first function relationship and a second function relationship are determined. The first function relationship is a function relationship between the stress of the steel wire with the largest elongation after the steel wire is loaded and the steel wire winding angle. The second function relationship is a function relationship between the bending moment generated when the swing hose is bent and the steel wire winding angle. Then, according to the first function relationship and the second function relationship, a target steel wire winding angle is determined to calculate the steel wire weaving angle. In this way, while reducing the engine swing load moment caused by the bending of the swing hose, the stress uniformity of the steel wire mesh swing hose is improved, the carrying capacity is improved, and the service life of the swing hose is improved.

[0158] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the swing hose steel wire weaving angle determination device described above can refer to the corresponding process in the foregoing method, and will not be described in detail here.

[0159] The above is only various embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of determining a weave angle of a swing hose steel wire, characterized by, The method applied to a wire mesh sleeve of a liquid rocket engine swing hose comprises: obtaining the medium internal pressure of the swing hose, the wire distribution circle diameter, the bellows pass diameter, the wire diameter, the wire initial length of each wire, and the swing hose initial length; determining a first function relationship and a second function relationship according to the medium internal pressure of the swing hose, the wire distribution circle diameter, the bellows pass diameter, the wire diameter, the wire initial length of each wire, and the swing hose initial length, the first function relationship being a function relationship between the stress of the wire with the largest elongation and the wire winding angle after the wire bears the load, and the second function relationship being a function relationship between the bending moment generated when the swing hose bends and the wire winding angle; determining the target wire winding angle according to the first function relationship and the second function relationship, so as to calculate the wire weaving angle; the method further comprises: determining the wire bending length of each wire after the swing hose bends; determining the bellows equivalent diameter according to the wire distribution circle diameter, the bellows pass diameter, and the wire diameter; determining the first mapping relationship between the elongation of the swing hose and the wire winding angle according to the bellows equivalent diameter, the medium internal pressure, the wire initial length, the wire diameter, the wire bending length, and the swing hose initial length; determining the second mapping relationship between the wire bearing length of the bearing wire and the wire winding angle according to the first mapping relationship and the wire bending length; determining the third mapping relationship between the equivalent elongation of all wires and the wire winding angle according to the second mapping relationship and the wire initial length; determining the first function relationship between the stress of the wire with the largest elongation and the wire winding angle according to the second mapping relationship, the third mapping relationship, and the bellows equivalent diameter by the following formula: wherein, is the tensile force on the steel wire with the largest elongation, is the tensile force on the steel wire with the largest elongation, is the axial tensile force on the wobble hose by the steel wire with the largest elongation, ΔL dx is the equivalent elongation of all the steel wires, ΔL is the elongation of the wobble hose, F is the axial load on the single layer of steel wires, is the steel wire braid angle, d gs is the steel wire diameter, β is the steel wire lay angle, D is the steel wire distribution circle diameter, L is the initial length of the wobble hose; determining the second function relationship according to the medium internal pressure, the bellows equivalent diameter, the wire initial length, the first mapping relationship, the second mapping relationship, and the mapping relationship by the following formula: wherein, is the bending moment, F is the axial load carried by the single layer of steel wires, ΔL is the elongation of the hose, ΔL dx is the equivalent elongation of all steel wires, D is the diameter of the wire distribution circle, β is the wire winding angle, is the wire weaving angle, θ i is the initial phase angle of the i-th steel wire, L is the initial length of the hose, L g,i is the steel wire carrying length, L0 is the initial length of the steel wire, n is the number of steel wire strands of the single layer.

2. The method of swing hose steel wire braid angle determination of claim 1, wherein, the method further comprises: determining the bellows equivalent diameter according to the wire distribution circle diameter, the bellows pass diameter, and the wire diameter by the following formula: where D dl is the equivalent diameter of the bellows, D is the diameter of the wire distribution circle, d is the pass diameter of the bellows, d gs is the diameter of the wire.

3. The method of claim 1, wherein, determining the first mapping relationship between the elongation of the swing hose and the wire winding angle according to the bellows equivalent diameter, the medium internal pressure, the wire initial length, the wire diameter, the wire bending length, and the swing hose initial length by the following formula: ​ wherein AL is the elongation of the swing hose, F is the axial load borne by the single layer of steel wires, L0 is the initial length of the steel wires, n is the number of steel wires in the single layer, E is the material elasticity coefficient, d gs is the steel wire diameter, L w，i is the steel wire bending length, is the steel wire weaving angle, β is the steel wire winding angle, D is the steel wire distribution circle diameter, and L is the initial length of the swing hose.

4. The method of claim 1, wherein, The second mapping relationship between the bearing length of the bearing steel wire and the winding angle of the steel wire is determined according to the first mapping relationship and the bending length of the steel wire, and includes: The second mapping relationship between the bearing length of the bearing steel wire and the winding angle of the steel wire is determined according to the first mapping relationship and the bending length of the steel wire, and includes: where L g,i is the wire bearing length, L w，i is the wire bending length, and ΔL is the elongation of the swing hose.

5. The method of claim 1, wherein, The third mapping relationship between the equivalent elongation of all steel wires and the winding angle of the steel wire is determined according to the second mapping relationship and the initial length of the steel wire, and includes: The third mapping relationship between the equivalent elongation of all steel wires and the winding angle of the steel wire is determined according to the second mapping relationship and the initial length of the steel wire, and includes: wherein ΔL dx is the equivalent elongation of all steel wires, L g,i is the steel wire length of the load bearing steel wire, L0 is the initial length of the steel wire, and n is the number of steel wires of the single layer.

6. A device for determining the angle of wire braid on a swing hose, characterized in that The device includes the swing hose steel wire weaving angle determination method according to any one of claims 1-5. The data acquisition module is configured to acquire the medium internal pressure of the swing hose, the steel wire distribution circle diameter, the corrugated pipe diameter, the steel wire diameter, the initial length of each steel wire, and the initial length of the swing hose. The function determination module is configured to determine a first function relationship and a second function relationship according to the medium internal pressure of the swing hose, the steel wire distribution circle diameter, the corrugated pipe diameter, the steel wire diameter, the initial length of each steel wire, and the initial length of the swing hose. The weaving angle determination module is configured to determine a target steel wire winding angle according to the first function relationship and the second function relationship, so as to calculate the steel wire weaving angle.

7. An electronic device, comprising: The device includes the swing hose steel wire weaving angle determination method according to any one of claims 1-5. The device includes the swing hose steel wire weaving angle determination method according to any one of claims 1-5.

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