CN-122016212-A - Multichannel air spring displacement loading system and control method thereof

Abstract

A multichannel air spring displacement loading system and a control system thereof comprise a tool (1), pressure sensors (2), air springs (3), laser displacement sensors (4), a guide mechanism (5) and a limiting mechanism (6), wherein the tool 1 is of a rigid structure, is located on the upper floating surface of the air springs (3) and serves as a common lifting surface of the upper surface of the air springs (3), the lower surface of the tool (1) is fixedly connected with the upper surface of the air springs (3), the lower surface of the air springs (3) is fixedly connected with a foundation, the pressure sensors (2) are installed on the air springs (3) and used for measuring real-time air pressure in each air spring and transmitting the real-time air pressure to the control system through signal cables, each independent air spring is matched with the pressure sensor (2), the air springs (3) are arranged in a plurality for realizing a displacement loading executing mechanism, the laser displacement sensors (4) are installed on the side of the air springs and are used for measuring displacement changes of the upper surface and the lower surface of the air springs (3), the air springs (3) are fixedly connected with the upper surface of the control system through the signal cables, each independent air springs (3) are installed on the side, and the guide mechanism (5) is stably and does not have a sudden change when the air springs (1) are in a sudden load.

Inventors

• HOU JINGFENG
• RUI PENG
• HE TIANYU
• LI YANAN
• HE ZHIGUO
• HAO YANYAN
• DOU XUECHUAN
• WANG LIJUAN
• WANG MENG

Assignees

• 北京强度环境研究所

Dates

Publication Date

20260512

Application Date

20260309

Claims (5)

1. 1. The multichannel air spring displacement loading system is characterized by comprising a tool (1), a pressure sensor (2), an air spring (3), a laser displacement sensor (4), a guide mechanism (5) and a limiting mechanism (6); the tool 1 is of a rigid structure and is positioned on the upper floating surface of the air spring 3 and used as a common lifting surface of the upper surface of the air spring (3), the lower surface of the tool 1 is fixedly connected with the upper surface of the air spring (3), and the lower surface of the air spring (3) is fixedly connected with a foundation; the pressure sensor (2) is arranged on the air springs (3) and is used for measuring the real-time air pressure in each air spring and transmitting the real-time air pressure to the control system through a signal cable; the air springs (3) are actuating mechanisms for realizing displacement loading, and a plurality of the air springs (3) are arranged; the laser displacement sensor (4) is arranged on the air spring side and is used for measuring the displacement changes of the upper surface and the lower surface near the air springs 3 and transmitting the displacement changes to the control system through a signal cable, and each independent air spring (3) is matched with the laser displacement sensor (4); the static lower end of the guide mechanism (5) is fixedly connected to the ground, and the axially moving upper end of the guide mechanism is fixedly connected to the tool (1) and is used for only reserving vertical movement degrees of freedom and restraining other direction degrees of freedom so as to prevent the tool (1) from generating angular movement in pitching and rolling directions in the movement process; Two ends of the tooling are provided with limiting mechanisms (6); under the condition of no load of the tool (1), a guide mechanism (5) is arranged to ensure that the upward floating and falling process of the tool (1) is stable and resultant force generated by the air spring (3) is free from abrupt change.
2. 2. A system according to claim 1, characterized in that if the air chambers of a plurality of air springs (3) are connected, the air springs connected to each other are regarded as one independent air spring.
3. 3. The system of claim 1, wherein the lugs are arranged at two ends of the tool (1) and are matched with the flanging structure for use, so that the movement range of the tool (1) in the vertical direction is limited, and the tool (1) is prevented from being in an excessively high or excessively low position.
4. 4. The method for installing a system according to claim 1, wherein the flow is as follows: A1, selecting and arranging the air A2 by the spring (3) according to the load or the load approximate distribution condition, the loading stroke requirement and the like on the tool (1); A3, designing the vertical supporting frequency of the air spring (3) according to the vibration frequency requirement of the test process of the tool 1, and installing a corresponding additional air chamber; a4, under the condition that the tool (1) is in no-load, a guide mechanism (5) is arranged to ensure that the tool (1) floats upwards and falls back stably and resultant force generated by the air spring (3) is free from abrupt change; A5, designing and installing a limiting mechanism (6) according to the loading stroke requirement.
5. 5. A control method of a multichannel air spring displacement loading system is characterized by comprising the following steps: under the condition that the tool (1) is in no-load, using all air springs (3) to perform slow position control, floating the tool (1) to a test position for maintenance, and recording load distribution values of all the air springs (3; B2, applying 30% and 60% of the maximum test static load step by step on the tool (1), and respectively recording the load distribution values of all the air springs (3); according to the load change trend of each air spring (3), pushing out load distribution values of all the air springs (3) when the tooling (1) bears 60% -100% static load, and calculating a load distribution proportional relationship, for example, the load distribution proportional relationship of n air springs is 1:f2:f3:f4. B4, when the dead weight of the tool (1) is not more than 10% of the maximum static load borne by the tool 1, the load distribution of the air spring (3) at 60% of the static load is considered to be no difference from the load distribution of the push-out air spring (3) at 60% -100% of the static load; B4, selecting three air springs (3) with positions close to the edge of the tool (1) from all the air springs (3) to be set as a displacement closed-loop control mode, and setting the rest air springs (3) as a load closed-loop control mode; and B5, two types of air springs (3) exist in the loading process at the same time.

Description

Multichannel air spring displacement loading system and control method thereof Technical Field The invention belongs to the technical field of vibration tests, and particularly relates to an application of a plurality of air springs jointly used for supporting the same rigid structure, and in an occasion with high requirement on position maintenance precision, for example, after displacement loading of a test piece, vibration tests are carried out. Background The fuel in the storage tank of the liquid fuel propellant spacecraft such as the carrier rocket is required to be conveyed to the engine through the fuel conveying pipeline under pressure, and meanwhile, in the normal working process of the engine, the engine vibration can be transmitted to the fuel storage tank through the fuel conveying pipeline, and the pressure of about 1MP is usually present in the conveying pipeline. In order to fully simulate the working state of the fuel delivery pipeline in the ground test, a vibration test under flexible displacement static load needs to be carried out. In the ground test, the flexible displacement loading can be realized by air springs, and for the working condition of larger size or larger counter force in the displacement loading, a plurality of air springs are usually required to be arranged separately and loaded together. Because the test needs to compound vibration working conditions, the rigidity of a structure or a tool lifted by a plurality of air springs is higher, and the multi-point (4 points or more than 4 points) synchronous position control system is a typical hyperstatic system, and under the premise of lacking single-point theoretical bearing, the bearing load of an individual air spring is possibly overlarge or undersize due to long-time position maintenance, so that the test risk is brought. Disclosure of Invention (One) solving the technical problems The invention discloses a multichannel air spring displacement loading system and a control method thereof, which adopt a pressure and displacement combination control method to realize high-precision flexible displacement loading. (II) technical scheme A multichannel air spring displacement loading system comprises a tool, a pressure sensor, an air spring, a laser displacement sensor, a guide mechanism and a limiting mechanism; the lower surface of the tool is fixedly connected with the upper surface of the air spring through a bolt, and the lower surface of the air spring is fixedly connected with the foundation through a bolt; the pressure sensor is arranged on the air springs and is used for measuring the real-time air pressure in each air spring and transmitting the real-time air pressure to the control system through the signal cable; the air springs 3 are a plurality of execution mechanisms for realizing displacement loading; The laser displacement sensor is arranged at the air spring side and is used for measuring the displacement changes of the upper surface and the lower surface near the air spring and transmitting the displacement changes to the control system through the signal cable, and each independent air spring is matched with the laser displacement sensor; the static lower end of the guide mechanism is fixedly connected to the ground, and the axially moving upper end of the guide mechanism is fixedly connected to the tool, so that only the vertical movement freedom degree is reserved, the other direction freedom degrees are restrained, and the tool 1 is prevented from generating angular movement in the pitching and rolling directions in the movement process; two ends of the tooling are provided with limiting mechanisms which are fixedly connected with the foundation through bolts; Under the condition of no load of the tool, the guiding mechanism is arranged, so that the tool is ensured to float upwards and fall back stably, and resultant force generated by the air spring is free from abrupt change. Further, if the air cells of the plurality of air springs are communicated, the air springs communicated with each other are regarded as one independent air spring. Further, the lugs are arranged at the two ends of the tool and are matched with the flanging structure for use, so that the movement range of the tool in the vertical direction is limited, and the tool is prevented from being in an excessively high or excessively low position The system installation method comprises the following steps: A1, selecting and arranging a spring according to the load on the tool or the load distribution condition, the loading stroke requirement and the like; A3, designing the vertical supporting frequency of the air spring according to the vibration frequency requirement of the tool test process, and installing a corresponding additional air chamber; A4, under the condition of no load of the tool, installing a guide mechanism to ensure stable floating and falling processes of the tool, and ensuring that resultant force generated by the air s