Solid rocket engine shell dynamic loading test device and unbalance loading protection method

Abstract

The invention provides a dynamic loading test device for a solid rocket engine shell and an unbalance loading protection method. The dynamic loading test device comprises a stress application cap, a plurality of connecting pull rods, a pressurizing assembly, a test platform and a dynamic loading and unbalance loading multi-channel coordination control system. The pressurizing assemblies are vertically connected with the stress application cap through the connecting pull rods; the multiple pressurizing assemblies are composed of unbalance loading protection assemblies and hydraulic actuators. And the dynamic loading and unbalance loading multi-channel coordination control system is electrically connected with the hydraulic actuator. A mounting gap between the upper surface of the stress application cap and the connecting pull rod is eliminated by adjusting the strokes of the unbalance loading protection assemblies; and a dynamic loading and unbalance loading multi-channel coordination control system is used for controlling multiple groups of hydraulic actuators. According to the invention, the unbalance loading phenomenon possibly generated during the dynamic loading test is solved, the mounting gap between the connecting pull rod and the stress application cap is eliminated, the stress application cap is enabled to apply uniform force to the test piece, and the unbalance loading problem is not generated under the condition that the load is rapidly increased.

Description

Technical Field

[0001] The invention belongs to the technical field of solid rocket engine structural strength testing, and in particular relates to a solid rocket engine casing dynamic loading testing device and an eccentric load protection method. Background Art

[0002] Static test is an important part of the solid rocket engine structural strength test. The solid rocket engine structural static test is a basic test that uses experimental methods to simulate loads and boundary conditions to observe and study the strength, stiffness, stability, stress and deformation distribution of solid rocket engines or their components under (quasi) static loads. The static test mainly installs the actuator on the ground test platform, connects it to the engine casing through the test fixture, and applies load to the engine casing to achieve the purpose of axial tension, axial compression, shear force, bending moment and various load combination assessment tests.

[0003] At present, with the increasingly high requirements for engine performance assessment, new requirements have been put forward for the dynamic and rapid loading targets in the field of shell structure strength testing. The traditional solid engine composite shell structure strength test adopts a static loading method, and the test implementation process is slow. It usually takes about thirty minutes to simulate a working condition. There is a large difference between the test load loading process and the actual load-bearing working condition. The use of dynamic loading can well simulate the actual load state of the engine, and has greater accuracy and effectiveness in verification. In the axial compression dynamic loading test of the solid rocket engine shell, the lower end of the test piece is fixed by a supporting device (transition frame, test platform), and the upper end is connected to the afterburner cap / afterburner beam through a transition frame. Two or four symmetrical sets of concentrated force dynamic loading devices are used to apply tension to the afterburner cap / afterburner beam to achieve the loading of the axial compression load on the test piece.

[0004] During the axial compression dynamic loading test of the solid rocket engine casing, there is a gap in the initial position of the connecting tooling during the test assembly process, and there is a gap at different loading points before the load is applied. Therefore, after the dynamic load begins to be applied, there is a risk of unbalanced loading due to the rapid increase in load, which not only causes uneven force on the test piece, but also poses certain safety hazards. Summary of the invention

[0005] The purpose of the present invention is to solve the problem of off-center loading risk in the axial compression dynamic loading test of the solid rocket engine casing in the prior art, and to provide a solid rocket engine casing dynamic loading test device and an off-center loading protection method.

[0006] To achieve the above purpose, the technical solution provided by the present invention is:

[0007] A solid rocket motor casing dynamic loading test device is provided.

[0008] The dynamic loading test device includes a force cap, a test platform, a dynamic loading eccentric load multi-channel coordinated control system, and a plurality of one-to-one corresponding connecting rods and pressurizing components; the test platform is used to install the test piece, and the upper end of the test piece is fixedly connected to the middle of the force cap through a transition frame; each group of pressurizing components is vertically connected to the force cap through a connecting rod, and multiple groups of pressurizing components are evenly arranged circumferentially along the central axis of the force cap; each group of pressurizing components consists of an eccentric load protection component with adjustable length and a hydraulic actuator; the eccentric load protection component eliminates the gap between the connecting rod and the upper surface of the force cap by adjusting its own length; the upper end of the eccentric load protection component is fixedly connected to the lower end of the connecting rod, and the lower end is fixedly connected to the upper end of the hydraulic actuator, and the lower end of the hydraulic actuator is fixed to the side of the test platform; the dynamic loading eccentric load multi-channel coordinated control system is electrically connected to the hydraulic actuator, and is used to control the tension applied by the hydraulic actuator to the force cap.

[0009] Furthermore, the overload protection assembly includes a support member, a laser displacement sensor and two connecting rods; the support member is an internal hollow column with a forward threaded hole at the upper end, a reverse threaded hole at the lower end, and a fixing seat in the middle for installing the laser displacement sensor; the connecting rod is provided with an external thread, and the two connecting rods are respectively installed in the forward threaded hole and the reverse threaded hole through threaded matching; the connecting rod at the top of the support member is connected to the connecting pull rod, and the connecting rod at the bottom of the support member is connected to the hydraulic actuator, and the two connecting rods and the support member are used to adjust the distance between the connecting pull rod and the hydraulic actuator.

[0010] Furthermore, the pressurizing assembly also includes a force sensor, which is installed between the eccentric load protection assembly and the hydraulic actuator.

[0011] Furthermore, a plurality of through holes are provided on the force cap, the upper end of the connecting rod has a disc structure, the lower end of the connecting rod passes through the through hole and is connected to the connecting rod of the overload protection assembly located at the upper end of the support member, and the upper end is clamped on the upper surface of the force cap through the disc.

[0012] Furthermore, the dynamic loading and eccentric loading multi-channel coordinated control system includes a control console, a plurality of neural network controllers, and a plurality of hydraulic control channels corresponding one to one with the neural network controllers;

[0013] The control console is electrically connected to a plurality of neural network controllers, and the plurality of neural network controllers are electrically connected to hydraulic control channels corresponding thereto, so as to control a plurality of hydraulic actuators corresponding thereto.

[0014] A method for protecting a solid rocket motor casing from an eccentric load during a dynamic loading test is also provided, which is applied to a dynamic loading test device and comprises the following steps:

[0015] Step 1: Assemble the dynamic loading test device;

[0016] Step 2: Install the test piece on the test platform, and fix the upper end of the test piece to the middle of the force cap through a transition frame, so that the test piece is located in the middle of multiple groups of pressure components to ensure balanced force on the test piece during the test;

[0017] Step 3: Use tools to adjust the strokes of multiple sets of eccentric load protection components to eliminate the installation gap between the upper surface of the force cap and the connecting rod, so that the connecting rod is in a stressed state and the force cap remains in a balanced state;

[0018] Step 4: Use a dynamic loading eccentric load multi-channel coordinated control system to control multiple groups of hydraulic actuators, and control multiple groups of hydraulic actuators individually or jointly to prevent eccentric loads caused by uneven force on the test pieces when pressurizing multiple groups of hydraulic actuators.

[0019] Furthermore, in step 3, during adjustment, the values ​​of multiple force sensors and laser displacement sensors are monitored synchronously, and during the adjustment process, it is ensured that the values ​​of the multiple force sensors remain consistent and the distances between the multiple sensors and the force cap remain consistent.

[0020] Furthermore, in step 4, the console outputs a given signal synchronously to multiple neural network controllers, the neural network controller controls the corresponding hydraulic control channel, and then controls multiple hydraulic actuators to synchronously apply tension to the force cap, and then outputs a feedback signal to the console, and the console outputs the feedback signal to multiple neural network controllers; the console can control multiple hydraulic actuators and realize the interaction of feedback signals between different hydraulic actuators, thereby coordinating the loading of dynamic loads between the hydraulic actuators.

[0021] The advantages of the present invention are:

[0022] 1. The present invention proposes a solution to the off-center loading phenomenon that may occur when a solid rocket engine is subjected to a dynamic loading test, thereby eliminating the installation gap between the connecting rod and the booster cap, so that the force applied by the booster cap to the test piece is uniform, and even when the load increases rapidly, there will be no off-center loading problem.

[0023] 2. The structure and installation process of the present invention are simple, the installation operation risk is low, and the adjustment is convenient. It can flexibly adapt to different test schemes for dynamic load loading and realize the process design of different test pieces.

[0024] 3. The dynamic loading and unbalanced loading multi-channel coordinated control system of the present invention can realize the independent control of different hydraulic actuators, and can also realize the interaction of feedback signals between different hydraulic actuators, thereby coordinating the loading effects of dynamic loads between the hydraulic actuators to achieve the purpose of preventing unbalanced loading. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The features and advantages of the present invention will become more readily understood through the following description with reference to the accompanying drawings, which are not drawn to scale and in which some features are exaggerated or minimized to show details of particular components:

[0026] Figure 1 It is a schematic diagram of the assembly of the test piece, the dynamic loading test device and the test platform in an embodiment of the present invention;

[0027] Figure 2 is a schematic structural diagram of an eccentric load protection assembly according to an embodiment of the present invention;

[0028] Figure 3 It is a schematic diagram of the control principle of a dynamic loading and unbalanced loading multi-channel coordinated control system in an embodiment of the present invention.

[0029] In the figure: 100 - dynamic loading test device; 110 - force cap; 120 - connecting rod; 130 - overload protection assembly; 131 - support member; 132 - connecting rod; 133 - fixed seat; 140 - force sensor; 150 - hydraulic actuator; 200 - test platform; 300 - test piece. DETAILED DESCRIPTION

[0030] The present invention will be described in detail below with reference to the accompanying drawings by means of exemplary embodiments of the present invention. It should be noted that the following detailed description of the present invention is only for the purpose of illustration, and is not intended to limit the present invention.

[0031] like Figure 1 As shown, a solid rocket engine casing dynamic loading test device 100 includes a boost cap 110, a test platform 200, a dynamic loading eccentric load multi-channel coordinated control system, and two one-to-one corresponding connecting rods 120 and a pressurizing assembly; the test platform 200 is used to install a test piece 300, and the upper end of the test piece 300 is fixedly connected to the middle of the boost cap 110.

[0032] Each group of pressure components is vertically connected to the force cap 110 through a connecting rod 120, and the two groups of pressure components are evenly arranged circumferentially along the central axis of the force cap 110. In this embodiment, pressure components are used at two positions, and the force cap 110 used is a force beam, so that the force cap 110 connected to the two groups of pressure components maintains a balanced state.

[0033] Specifically, two through holes are provided on the force cap 110, and the upper end of the connecting rod 120 has a disc structure. The lower end of the connecting rod 120 passes through the through hole and is connected to the connecting rod 132 located at the upper end of the support member 131 of the overload protection assembly 130, and the upper end is clamped on the upper surface of the force cap 110 through the disc.

[0034] The two sets of pressurizing components are composed of an eccentric load protection component 130 with adjustable length, a force sensor 140, and a hydraulic actuator 150; the upper end of the eccentric load protection component 130 is fixedly connected to the lower end of the connecting rod 120, the lower end is fixedly connected to the upper end of the force sensor 140, the lower end of the sensor 140 is fixedly connected to the upper end of the hydraulic actuator 150, and the lower end of the hydraulic actuator 150 is fixed to the side of the test platform 200. The eccentric load protection component 130 eliminates the gap between the connecting rod 120 and the upper surface of the force cap 110 by adjusting its own length.

[0035] like Figure 2 As shown, the overload protection assembly 130 includes a support member 131, a laser displacement sensor and two connecting rods 132; the support member 131 is an internal hollow column, with a forward threaded hole at the upper end, a reverse threaded hole at the lower end, and a fixing seat 133 for mounting the laser displacement sensor in the middle; the connecting rod 132 is provided with an external thread, and the two connecting rods 132 are respectively installed in the forward threaded hole and the reverse threaded hole through threaded matching; the connecting rod 132 at the upper part of the support member 131 is connected to the connecting rod 120, and the connecting rod 132 at the lower part of the support member 131 is connected to the hydraulic actuator 150, and the two connecting rods 132 and the support member 131 are used to adjust the distance between the connecting rod 120 and the hydraulic actuator 150, thereby eliminating the installation gap between the upper surface of the force cap 110 and the connecting rod 120.

[0036] In this embodiment, the support member 131 is made of 30CrMnSiA, and its shape and size can be adjusted according to the size of the test load and the morphology of the fixed interface of the laser displacement sensor.

[0037] The dynamic loading and eccentric loading multi-channel coordinated control system is electrically connected to the hydraulic actuator 150 and is used to control the pulling force applied by the hydraulic actuator 150 to the force adding cap 110 .

[0038] like Figure 3 As shown, the dynamic loading and eccentric loading multi-channel coordinated control system includes a control console, multiple neural network controllers and multiple hydraulic control channels corresponding to the neural network controllers one by one; the control console is electrically connected to the multiple neural network controllers, and the multiple neural network controllers are electrically connected to the hydraulic control channels corresponding to them, so as to control the multiple hydraulic actuators 150 corresponding to each other.

[0039] This embodiment proposes a solution to the unbalanced loading phenomenon that may occur when a solid rocket engine is subjected to a dynamic loading test. The installation gap between the connecting rod 120 and the booster cap 110 is eliminated, so that the force applied by the booster cap 110 to the test piece 300 is uniform, and even when the load increases rapidly, there will be no unbalanced loading problem.

[0040] This embodiment also provides a method for protecting against eccentric load in a dynamic loading test of a solid rocket motor casing, comprising the following steps:

[0041] Step 1: Assemble the dynamic loading test device 100;

[0042] Step 2: Install the test piece 300 on the test platform 200, and the upper end of the test piece 300 is fixedly connected to the middle of the force cap 110 through a transition frame, so that the test piece 300 is located in the middle of the multiple groups of pressurizing components, so that the force on the test piece 300 is balanced during the test;

[0043] Step 3: Use a tool to adjust the stroke of the multiple sets of eccentric load protection components 130 to eliminate the installation gap between the upper surface of the force cap 110 and the connecting rod 120, so that the connecting rod 120 is in a stressed state and the force cap 110 is kept in a balanced state;

[0044] Step 4: Use a dynamic loading and eccentric loading multi-channel coordinated control system to control multiple groups of hydraulic actuators 150, and control multiple groups of hydraulic actuators 150 individually or jointly to prevent the test piece 300 from being subjected to uneven force and eccentric loading when the multiple groups of hydraulic actuators 150 are pressurized.

[0045] Next, each step of the above method in this embodiment will be described in more detail.

[0046] In step 1, a plurality of pressurizing components are symmetrically connected to the bottom of the force cap 110 with the central axis of the force cap 110 as the symmetry axis, and the force cap 110 connected to the plurality of pressurizing components is kept in a balanced state.

[0047] In this embodiment, based on factors such as test load conditions, two sets of symmetrical pressurizing components are selected to apply tension to the force cap 110, such as Figure 1 As shown, since the lower end of the hydraulic actuator 150 in the pressurizing assembly is fixed on both sides of the test platform 200, the distance from the lower end surface of the hydraulic actuator 150 to the force cap 110 is fixed. During the installation process, due to assembly or other reasons, the connecting rod 120 does not contact the upper surface of the force cap 110, or the connecting rod 120 and the upper surface of the force cap 110 are in contact with the naked eye, but there may still be a gap, so that the loads generated by the pressurizing assemblies on both sides on the force cap 110 are inconsistent. Further precise adjustment is required.

[0048] In step 2, the test platform 200 is located directly below the force cap 110, and the test piece 300 is installed between the force cap 110 and the test platform 200. Two sets of pressure components are used to apply a tensile force to the force cap 110 to achieve the loading of the axial compressive load on the test piece 300.

[0049] In this embodiment, the dynamic loading test installation is adjusted according to the test load conditions, the loading position and number of the test piece 300 to achieve the protection effect. The side wall of the support member 131 is provided with a clamping position for tools such as a wrench. The connecting rod 132 and the support member 131 are rotated relative to each other by the wrench, thereby changing the relative position of the connecting rod 132 in the positive threaded hole at the upper end. If the adjustment distance is not enough, the relative position of the lower connecting rod 132 in the reverse threaded hole can also be adjusted to change the length of the eccentric load protection assembly 130, thereby pulling the connecting rod 120 downward to fully contact the upper surface of the force cap 110, eliminating the installation gap between the connecting rod 120 and the upper surface of the force cap 110, and synchronously adjusting the eccentric load protection assemblies 130 on both sides.

[0050] During adjustment, the values ​​of the two force sensors 140 and the laser displacement sensor are monitored synchronously. During the adjustment process, ensure that the values ​​of the two force sensors 140 remain consistent, and the distance between the two sensors and the force cap 110 remains consistent. At this time, the force cap 110 is in a balanced state, avoiding the dynamic loading test device 100 from being in an unbalanced load state, and then the dynamic load is loaded.

[0051] In step 4, dynamic loading usually requires joint loading of hydraulic actuators 150 of multiple channels. Once the load is offset, the initial calibrated spacing values ​​and load values ​​of each channel will quickly form a large gap. The synchronization and coordination of the actions of multiple hydraulic actuators 150 under differentiated working conditions are the key to fast, accurate and uniform loading.

[0052] The dynamic loading and eccentric loading multi-channel coordinated control system adopts a closed-loop control system with dual parameters of force and displacement. The control principle is as follows: Figure 3 As shown, the input signal console outputs a given signal synchronously to multiple neural network controllers, the neural network controller controls the corresponding hydraulic control channel, and then controls multiple hydraulic actuators 150 to synchronously apply tension to the force cap 110, and then outputs a feedback signal to the feedback signal console, and the feedback signal console outputs the feedback signal to multiple neural network controllers; the console can control multiple hydraulic actuators 150 and realize the interaction of feedback signals between different hydraulic actuators 150, thereby coordinating the loading of dynamic loads between each hydraulic actuator 150.

[0053] In the previous single-channel control system, the feedback signal of the hydraulic system is only returned to the corresponding controller. Based on the actual needs of dynamic joint loading, the feedback signals of multiple control channels will be collected in the console and then selectively returned to different hydraulic control channels. Therefore, it is possible to realize the individual control of different hydraulic actuators 150 and the interaction of feedback signals between different hydraulic actuators 150, thereby coordinating the loading effects between the systems and achieving the goals of real-time, fast and accurate.

[0054] This embodiment prevents the off-center loading problem that occurs when the solid rocket engine is subjected to a dynamic loading test by setting up an off-center loading protection component 130 and a dynamic loading off-center loading multi-channel coordinated control system in terms of hardware connection and software control, thereby improving the accuracy and reliability of the dynamic loading test results.

[0055] The solid rocket engine casing dynamic loading test device and off-center load protection method designed in this embodiment eliminate the installation gap between the connecting rod 120 and the booster cap 110, eliminate the off-center load problem, and can realize independent control of different hydraulic actuators 150 through the dynamic loading off-center load multi-channel coordinated control system, and can also realize the interaction of feedback signals between different hydraulic actuators 150, thereby coordinating the loading effects of the dynamic loads between the hydraulic actuators 150 and achieving the purpose of preventing off-center loads.

[0056] Finally, it should be noted that the features mentioned and / or shown in the above description of the exemplary embodiments of the present invention may be combined in the same or similar manner into one or more other embodiments, combined with the features in other embodiments or substituted for the corresponding features in other implementations. The technical solutions obtained by these combinations or substitutions shall also be deemed to be included in the protection scope of the present invention.

Claims

1. A solid rocket engine casing dynamic loading test device, characterized in that: The dynamic loading test device (100) comprises a force-adding cap (110), a test platform (200), a dynamic loading and eccentric loading multi-channel coordinated control system, and a plurality of one-to-one corresponding connecting rods (120) and a pressurizing assembly; The test platform (200) is used to install the test piece (300), and the upper end of the test piece (300) is fixedly connected to the middle of the force-adding cap (110) through a transition frame; Each group of pressurizing components is vertically connected to the force cap (110) via a connecting rod (120), and the multiple groups of pressurizing components are evenly arranged in the circumferential direction along the central axis of the force cap (110); Each group of pressurizing components is composed of an eccentric load protection component (130) capable of adjusting its length and a hydraulic actuator (150); the eccentric load protection component (130) eliminates the gap between the connecting rod (120) and the upper surface of the force cap (110) by adjusting its own length; The upper end of the eccentric load protection assembly (130) is fixedly connected to the lower end of the connecting rod (120), and the lower end is fixedly connected to the upper end of the hydraulic actuator (150), and the lower end of the hydraulic actuator (150) is fixed to the side of the test platform (200); The dynamic loading and eccentric loading multi-channel coordinated control system is electrically connected to the hydraulic actuator (150) and is used to control the pulling force applied by the hydraulic actuator (150) to the force adding cap (110).

2. A solid rocket engine casing dynamic loading test device according to claim 1, characterized in that: The off-center load protection assembly (130) comprises a support member (131), a laser displacement sensor and two connecting rods (132); The support member (131) is in the shape of a hollow column, with a positive threaded hole at the upper end, a reverse threaded hole at the lower end, and a fixing seat (133) for mounting a laser displacement sensor at the middle part; The connecting rod (132) is provided with an external thread, and the two connecting rods (132) are respectively installed in the forward threaded hole and the reverse threaded hole through thread matching; The connecting rod (132) at the upper part of the support member (131) is connected to the connecting rod (120), and the connecting rod (132) at the lower part of the support member (131) is connected to the hydraulic actuator (150). The two connecting rods (132) and the support member (131) are used to adjust the distance between the connecting rod (120) and the hydraulic actuator (150).

3. A solid rocket engine casing dynamic loading test device according to claim 1, characterized in that: The pressurizing assembly further comprises a force sensor (140), and the force sensor (140) is installed between the eccentric load protection assembly (130) and the hydraulic actuator (150).

4. A solid rocket engine casing dynamic loading test device according to claim 2, characterized in that: A plurality of through holes are provided on the force cap (110), the upper end of the connecting rod (120) has a disc structure, the lower end of the connecting rod (120) passes through the through hole and is connected to a connecting rod (132) of the overload protection assembly (130) located at the upper end of the support member (131), and the upper end is clamped to the upper surface of the force cap (110) through the disc.

5. A solid rocket engine casing dynamic loading test device according to claim 1, characterized in that: The dynamic loading and eccentric loading multi-channel coordinated control system includes a control console, a plurality of neural network controllers, and a plurality of hydraulic control channels corresponding to the neural network controllers one by one; The control console is electrically connected to the plurality of neural network controllers, and the plurality of neural network controllers are electrically connected to the hydraulic control channels corresponding thereto one by one, for controlling the plurality of hydraulic actuators (150) corresponding thereto.

6. A method for protecting a solid rocket engine casing from eccentric loading during a dynamic loading test, applied to the dynamic loading test device of claims 1 to 5, characterized in that: The following steps are involved: Step 1: Assembling a dynamic loading test device (100); Step 2: The test piece (300) is mounted on the test platform (200), and the upper end of the test piece (300) is fixedly connected to the middle of the force-applying cap (110) through a transition frame, so that the test piece (300) is located in the middle of the plurality of pressure-applying components, so that the force on the test piece (300) is balanced during the test; Step 3: Use a tool to adjust the stroke of the multiple sets of eccentric load protection components (130) to eliminate the installation gap between the upper surface of the force cap (110) and the connecting rod (120), so that the connecting rod (120) is in a stressed state and the force cap (110) is kept in a balanced state; Step 4: Use a dynamic loading eccentric load multi-channel coordinated control system to control multiple groups of hydraulic actuators (150), and control the multiple groups of hydraulic actuators (150) individually or jointly to prevent the test piece (300) from being subjected to uneven force and eccentric loading when the multiple groups of hydraulic actuators (150) are pressurized.

7. A method for protecting against eccentric loading in a dynamic loading test of a solid rocket motor casing according to claim 6, characterized in that: In step 3, during adjustment, the values ​​of the multiple force sensors (140) and the laser displacement sensor are synchronously monitored, and during the adjustment process, it is ensured that the values ​​of the multiple force sensors (140) remain consistent, and the distances between the multiple sensors and the force cap (110) remain consistent.

8. A method for protecting against eccentric loading in a dynamic loading test of a solid rocket motor casing according to claim 6, characterized in that: In step 4, the console outputs a given signal to the multiple neural network controllers synchronously, and the neural network controllers control the hydraulic control channels corresponding to them, thereby controlling the multiple hydraulic actuators (150) to synchronously apply tension to the force-adding cap (110), and then outputs a feedback signal to the console, and the console outputs the feedback signal to the multiple neural network controllers; The control console can control a plurality of hydraulic actuators (150) and realize the interaction of feedback signals between different hydraulic actuators (150), thereby coordinating the loading of dynamic loads between the hydraulic actuators (150).

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