Electric propulsion ground mechanical property evaluation device

Abstract

The invention relates to the technical field of electric propulsion ground testing, in particular to an electric propulsion ground mechanical property evaluation device which comprises an optical vibration isolation platform, a stepping motor, an adjustable bottom plate, a fixed support, a coil, a movable frame, an electric thruster, a steel ball, a permanent magnet and a control box. The screw rod is connected with the lower surface of the front end of the adjustable bottom plate; the steel ball is in contact with the lower surface of the rear end of the adjustable bottom plate; the movable frame is arranged above the adjustable bottom plate through an elastic rod; the permanent magnet is arranged on the front end side of the movable frame; one end of the fixed bracket is fixed on the upper surface of the front end of the adjustable bottom plate, and the other end is movably connected with the permanent magnet; the coil is wound on the fixed bracket; the electric thruster is arranged at the rear end of the movable frame; and the control box is arranged between the adjustable bottom plate and the movable frame. According to the application, the measurement of the thrust of the electric thruster is more reliable, the elastic piece can be protected, and the influence of environment temperature and stress on the measurement result is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of electric propulsion ground testing, and in particular to an electric propulsion ground mechanical performance evaluation device. Background Art

[0002] With the widespread application of electric propulsion technology and the improvement of electric propulsion research and development capabilities, the understanding of electric propulsion has become more in-depth. Thrust measurement is the most basic performance parameter of electric thrusters. It can directly show the relationship between electrical parameters and thrust changes, which is of great significance to the design of electric propulsion space application strategies.

[0003] When conducting simulation tests in the ground environment, since the electric thrusters work in a vacuum environment, they are affected by environmental vibrations caused by the vacuum pump, heat generated during the operation of the thrusters, and the thrusters' own power supply cables and air supply pipelines, making the measurement of electric propulsion's tiny thrust full of challenges.

[0004] Currently, the commonly used electric propulsion thrust measurement principle basically utilizes various pendulum structures. The thrust is obtained by detecting the displacement of the pendulum structure under a small thrust and combining it with calibration. However, the measurement results will be affected by factors such as cables and temperature. Summary of the invention

[0005] The present application provides an electric propulsion ground mechanical performance evaluation device, which reduces the influence of cables and temperature on thrust measurement results and ensures the accuracy of measurement.

[0006] In order to achieve the above-mentioned purpose, the present application provides an electric propulsion ground mechanical performance evaluation device, including an optical vibration isolation platform, a stepper motor, an adjustable base plate, a fixed bracket, a coil, a moving frame, an electric thruster, a steel ball, a permanent magnet and a control box, wherein: the stepper motor is arranged on the optical vibration isolation platform, and is connected to the front end lower surface of the adjustable base plate through a screw; the steel ball is arranged on the optical vibration isolation platform, and contacts the rear end lower surface of the adjustable base plate; the moving frame is arranged above the adjustable base plate through an elastic rod; the permanent magnet is arranged on the front end side of the moving frame; one end of the fixed bracket is fixed to the upper surface of the front end of the adjustable base plate, and the other end is movably connected to the permanent magnet; the coil is wound on the fixed bracket, and there is a gap between the coil and the permanent magnet; the electric thruster is arranged at the rear end of the moving frame; the control box is arranged between the adjustable base plate and the moving frame, and the bottom is fixed on the adjustable base plate.

[0007] Furthermore, a detection module and a temperature controller are provided inside the control box. The detection module is an elastic member strain detection module, and the temperature controller is a constant temperature controller.

[0008] Furthermore, a voltage is applied to the coil, and the permanent magnet drives the movable frame to move in the horizontal direction.

[0009] Furthermore, the position of the adjustable base plate is adjusted by means of a screw rod and a steel ball to keep it level.

[0010] Furthermore, the connecting cable of the electric thruster is a flexible printed cable.

[0011] The electric propulsion ground mechanical performance evaluation device provided in this application has the following beneficial effects:

[0012] The present application replaces the traditional method of measuring displacement through electrical signals by various sensors by using strain gauges to measure deformation, thereby reducing the use of electronic components under vacuum conditions, making the measurement of the thrust of the electric thruster more reliable. At the same time, a temperature controller is designed to protect the elastic parts and reduce the influence of ambient temperature on the measurement results. The connecting cable uses a flexible printed cable to reduce the influence of stress on the measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0014] Figure 1 is a schematic diagram of an electric propulsion ground mechanical performance evaluation device provided according to an embodiment of the present application;

[0015] In the figure: 1-optical vibration isolation platform, 2-stepping motor, 3-adjustable base plate, 4-fixed bracket, 5-elastic rod, 6-moving frame, 7-electric thruster, 8-flexible printed cable, 9-steel ball, 10-control box, 11-detection module, 12-permanent magnet, 13-coil. DETAILED DESCRIPTION

[0016] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0017] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0018] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0019] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0020] In addition, the term "plurality" shall mean two or more.

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] like Figure 1As shown, the present application provides an electric propulsion ground mechanical performance evaluation device, including an optical vibration isolation platform 1, a stepper motor 2, an adjustable base plate 3, a fixed bracket 4, a coil 13, a moving frame 6, an electric thruster 7, a steel ball 9, a permanent magnet 12 and a control box 10, wherein: the stepper motor 2 is arranged on the optical vibration isolation platform 1, and is connected to the front end lower surface of the adjustable base plate 3 through a screw rod; the steel ball 9 is arranged on the optical vibration isolation platform 1, and contacts the rear end lower surface of the adjustable base plate 3; the moving frame 6 is arranged above the adjustable base plate 3 through an elastic rod 5; the permanent magnet 12 is arranged on the front end side of the moving frame 6; one end of the fixed bracket 4 is fixed to the upper surface of the front end of the adjustable base plate 3, and the other end is movably connected to the permanent magnet 12; the coil 13 is wound on the fixed bracket 4, and there is a gap between it and the permanent magnet 12; the electric thruster 7 is arranged at the rear end of the moving frame 6; the control box 10 is arranged between the adjustable base plate 3 and the moving frame 6, and the bottom is fixed on the adjustable base plate 3.

[0023] Specifically, the electric propulsion ground mechanical performance evaluation device provided in the embodiment of the present application is mainly used for ground thrust testing of the electric thruster 7, wherein the optical vibration isolation platform 1 is used for support and fixation, and can isolate vibration to ensure the overall stability of the device; the stepper motor 2 and the steel ball 9 are used to fine-tune the position of the adjustable base plate 3, and the steel ball 9 is used as a rotating fulcrum to drive the lead screw to adjust the level of the adjustable base plate 3 through the stepper motor 2 to ensure the level of the thrust axis; the fixed bracket 4 is used to fix the coil 13; the moving frame 6 is fixed to the adjustable base plate 3 as a whole through the elastic rod 5, and the elastic rod 5 mainly plays a role of supporting and providing restoring force. A cylindrical permanent magnet 12 is arranged on the front end side of the moving frame 6; after power is turned on, under the action of the coil 13 and the permanent magnet 12, the moving frame 6 can move in the direction of the thrust, and after power is turned off, the moving frame 6 can return to the original equilibrium position under the action of the elastic rod 5; the electric thruster 7 is fixed to the moving frame 6 as a whole to generate thrust; the control box 10 is used to calibrate the thrust size and adjust the temperature.

[0024] Furthermore, a detection module 11 and a temperature controller are provided inside the control box 10. The detection module 11 is an elastic member strain detection module, and the temperature controller is a constant temperature controller. The detection module is an elastic member strain detection module, which is generally a cantilever beam structure. The strain gauge is attached to the side of the elastic member. As long as the upper movable frame moves, the elastic member will deform. The method of digging holes on the surface of the elastic material ensures that it has great rigidity in the vertical direction and relatively small rigidity in the horizontal direction. The thrust of the thruster is obtained by detecting the strain with the strain gauge, which reduces the use of electronic components under vacuum conditions. At the same time, in order to solve the problem that the test results of the thruster are affected by temperature drift after working for a period of time, the set temperature controller can provide a constant temperature environment. The temperature is preferably set at 40°C to ensure that the stiffness coefficient of the elastic member will not change significantly.

[0025] Furthermore, a voltage is applied to the coil 13, and the permanent magnet 12 drives the movable frame 6 to move in the horizontal direction.

[0026] Furthermore, the position of the adjustable base plate 3 is adjusted by the screw rod and the steel ball 9 to keep it horizontal.

[0027] Specifically, when the electric propulsion ground mechanical performance evaluation is performed in the embodiment of the present application, the electric thruster 7 is first fastened to the moving frame 6. Before the measurement begins, the internal electronic level bubble is detected to determine whether the adjustable base plate 3 is horizontal. The stepper motor 2 is controlled by PID to drive the lead screw to move vertically, and the adjustable base plate 3 will rotate slightly around the steel ball 9, so that the adjustable base plate 3 is always in a horizontal state, thereby ensuring the level of the thrust axis of the electric thruster 7; then enter the calibration link, load different voltages to the coil 13 on the fixed bracket 4, and the cylindrical permanent magnet 12 fixed on the moving frame 6 will move along the thrust direction to simulate different thrust values. At this time, the elastic structure of the detection module 11 in the control box 10 is deformed, and the deformation amount is detected by the strain gauge to establish the relationship between the standard force and the deformation amount; finally, a thrust test is performed, the power supply of the coil 13 on the fixed bracket 4 is cut off, the electric thruster 7 is started to work to generate thrust, and the deformation amount of the elastic structure in the control box 10 is detected again. Combined with the calibration result, the thrust size can be obtained.

[0028] Furthermore, the connection cable of the electric thruster 7 is a flexible printed cable 8. During the thrust test, the power supply cable of the electric thruster 7 has a great impact on the test. In the traditional design, the impact of the cable is weakened by hanging and various winding forms. The test equipment is huge and not conducive to equipment integration. In the embodiment of the present application, a flexible printed cable 8 is used to reduce the impact of cable stress while ensuring the high integration of the entire device.

[0029] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electric propulsion ground mechanical performance evaluation device, characterized in that: It includes an optical vibration isolation platform, a stepper motor, an adjustable base plate, a fixed bracket, a coil, a moving frame, an electric thruster, a steel ball, a permanent magnet and a control box, wherein: The stepper motor is arranged on the optical vibration isolation platform and is connected to the front lower surface of the adjustable bottom plate through a lead screw; The steel ball is arranged on the optical vibration isolation platform and contacts the lower surface of the rear end of the adjustable bottom plate; The movable frame is arranged above the adjustable bottom plate through an elastic rod; The permanent magnet is arranged on the front end side of the moving frame; One end of the fixed bracket is fixed to the upper surface of the front end of the adjustable bottom plate, and the other end is movably connected to the permanent magnet; The coil is wound on the fixed bracket, and there is a gap between the coil and the permanent magnet; The electric thruster is arranged at the rear end of the moving frame; The control box is arranged between the adjustable bottom plate and the movable frame, and the bottom is fixed on the adjustable bottom plate.

2. The electric propulsion ground mechanical performance evaluation device according to claim 1, characterized in that: A detection module and a temperature controller are arranged inside the control box. The detection module is an elastic member strain detection module, and the temperature controller is a constant temperature controller.

3. The electric propulsion ground mechanical performance evaluation device according to claim 2, characterized in that: A voltage is applied to the coil, and the permanent magnet drives the movable frame to move in a horizontal direction.

4. The electric propulsion ground mechanical performance evaluation device according to claim 3, characterized in that: The position of the adjustable bottom plate is adjusted by the screw rod and the steel ball to keep it level.

5. The electric propulsion ground mechanical performance evaluation device according to claim 4, characterized in that: The connecting cable of the electric thruster is a flexible printed cable.

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