CN-121980668-A - Axial guy cable rigidity-changing system for slender truss structure

CN121980668ACN 121980668 ACN121980668 ACN 121980668ACN-121980668-A

Abstract

The invention relates to an axial inhaul cable rigidity-changing system aiming at an elongated truss structure, which comprises a tension actuating mechanism, a tension measuring feedback mechanism and a control system, wherein the tension actuating mechanism applies tension to an inhaul cable according to a real-time driving instruction of the control system, the tension measuring feedback mechanism measures tension on the inhaul cable in real time and feeds the tension back to the control system, and the control system adopts a PID closed-loop control method and sends a real-time driving instruction to the tension actuating mechanism according to the real-time tension on the inhaul cable. The invention has low structure installation requirement, does not need an additional structure for installation, only needs to use the original truss for eliminating the axial inhaul cable of the pretightening force, has simple control method, can greatly change the physical characteristics of the structure, and can greatly change the rigidity of the truss structure in the bending direction by simply adjusting the tension force on the axial inhaul cable, thereby realizing vibration suppression and dynamic performance optimization.

Inventors

CHEN YU
LIU FEIHU
WANG GUANGYUAN
WU YONGSHENG
YU KUAI
CHEN ZHUO
GE MENG

Assignees

中国空间技术研究院

Dates

Publication Date: 20260505
Application Date: 20251212

Claims (8)

1. The axial inhaul cable rigidity-changing system for the slender truss structure is characterized by comprising a tension actuating mechanism, a tension measurement feedback mechanism and a control system; the tension actuating mechanism applies tension to the inhaul cable according to a real-time driving instruction of the control system; The tension measurement feedback mechanism is used for measuring the tension on the inhaul cable in real time and feeding back the tension to the control system; The control system adopts a PID closed-loop control method, and sends a real-time driving instruction to the tension actuating mechanism according to the real-time tension on the inhaul cable.
2. The system of claim 1, wherein the cables are disposed along the body truss axis.
3. The axial guy stiffness varying system for an elongated truss structure of claim 1, wherein said guy multiplexing primary truss structure is an axial guy for eliminating pretension.
4. The axial guy stiffness varying system for an elongated truss structure of claim 1 wherein the stiffness matrix of the truss and the guy tension The relation of (2) is as follows: Wherein the method comprises the steps of Is a rigidity matrix of the truss without axial guy cable tension, Is an axial pulling force of Rigidity matrix of truss Is an axial pulling force of The truss stiffness at the time changes matrix, Wherein the method comprises the steps of L is the length of the inhaul cable.
5. The system of claim 1, wherein the tension actuator comprises, but is not limited to, a linear motor, an articulation motor, a voice coil motor, and a piezoelectric ceramic actuator.
6. An axial guy stiffness varying system for an elongated truss structure as recited in claim 1 wherein the tension measurement feedback mechanism includes, but is not limited to, a tension pressure sensor, a spring load cell, a piezoelectric strain sensor.
7. An axial guy stiffness system for an elongated truss structure as set forth in claim 1 wherein the guy includes, but is not limited to, carbon fiber or aramid fiber.
8. The axial guy variable stiffness system for an elongated truss structure of claim 1, wherein the axial guy variable stiffness system is mounted at the root of the truss structure.

Description

Axial guy cable rigidity-changing system for slender truss structure Technical Field The invention belongs to the field of spacecraft truss structure design, and relates to an axial inhaul cable variable stiffness system for an elongated truss structure. Background In spacecraft structures, elongate trusses are widely used in systems such as satellite deployable mechanisms, space station support frames, and the like. The structure has the advantages of light weight and high rigidity, and plays an important role in guaranteeing the on-orbit performance of the spacecraft. However, during launch and in-orbit operation, the truss structure is often in a complex dynamic excitation environment, the natural frequency of the truss structure is easy to couple with the frequency of the control system, resonance phenomenon is caused, vibration is amplified, and therefore gesture stability and payload performance are affected. Currently, there are a number of technical approaches to vibration control of truss structures in the aerospace field. The passive damping method has the advantages of simple structure and high reliability, and can effectively inhibit vibration in a certain frequency band, but the inhibition frequency band is usually limited, and is difficult to completely adapt to a broadband vibration environment. The active control scheme, such as a system based on a piezoelectric actuator, has the characteristics of quick response and high control precision, is suitable for micro-amplitude vibration suppression, but the output displacement level is usually smaller, and is limited to a certain extent when the overall rigidity and frequency of the truss are greatly adjusted. In addition, cable systems which are arranged perpendicular to the truss are adopted on the ground, rigidity regulation and control are achieved through lateral tension regulation, the method expands the actuating stroke to a certain extent, but a supporting structure which is equivalent to the truss in size is usually required to be configured, extra complexity and quality can be possibly introduced, and the cable systems are not suitable for on-orbit application. Of note, many of the prior space truss structures themselves have included guys for stiffening or maintaining morphological stability. If the rigidity active regulation and control can be realized on the basis of the existing inhaul cable, the complexity and the weight of the system can be prevented from being obviously increased, the vibration problem caused by frequency coupling is expected to be effectively solved, and the adaptability of the spacecraft to an on-orbit dynamic environment is improved. Disclosure of Invention The invention solves the technical problem of overcoming the defects of the prior art and providing an axial inhaul cable rigidity-changing system for an elongated truss structure. The solution of the invention is as follows: An axial inhaul cable stiffness-changing system for an elongated truss structure comprises a tension actuating mechanism, a tension measurement feedback mechanism and a control system; the tension actuating mechanism applies tension to the inhaul cable according to a real-time driving instruction of the control system; The tension measurement feedback mechanism is used for measuring the tension on the inhaul cable in real time and feeding back the tension to the control system; The control system adopts a PID closed-loop control method, and sends a real-time driving instruction to the tension actuating mechanism according to the real-time tension on the inhaul cable. Preferably, the guy wires are arranged along the axis of the main truss. Preferably, the cable multiplexing original truss structure is used for eliminating the axial cable of pretightening force. Preferably, the rigidity matrix of the truss and the tension of the inhaul cableThe relation of (2) is as follows: Wherein the method comprises the steps of Is a rigidity matrix of the truss without axial guy cable tension,Is an axial pulling force ofRigidity matrix of trussIs an axial pulling force ofThe truss stiffness at the time changes matrix, Wherein the method comprises the steps of L is the length of the inhaul cable. Preferably, the tension actuating mechanism includes, but is not limited to, a linear motor, an articulating motor, a voice coil motor, a piezoceramic actuator. Preferably, the tension measurement feedback mechanism includes, but is not limited to, a tension pressure sensor, a spring load cell, a piezoelectric strain sensor. Preferably, the pull cord includes, but is not limited to, carbon fiber or aramid fiber. Preferably, the axial guy cable stiffness varying system is installed at the root of the truss structure. Compared with the prior art, the invention has the beneficial effects that: (1) The invention directly utilizes an axial guy cable structure originally preset for eliminating pretightening force or enhancing stability on a spacecraft truss, does