High-precision and wide-range micro-thrust measurement system

Abstract

The invention relates to a micro-thrust measurement technology based on a thrust platform, and its purpose is to design a universal wide-range thrust measurement research platform. The thrust platform adopts a torsion balance scheme based on a flexible pivot, including: platform structure, leveling mechanism, trim mechanism, flexible pivot, capacitive displacement sensor, calibration and force coil, damper, etc. The system has two working modes: open loop and closed loop. When working in open loop, the beam starts to rotate under the action of continuous (or pulse) thrust, and as the rotation angle gradually increases, the elastic restoring force also increases accordingly. Under the attenuation of damping, the final rotation angle will tend to a (quasi) steady state new equilibrium position. The thrust is obtained by measuring the angular displacement of the beam. In closed-loop operation, the thrust is balanced by introducing a counterbalance force generated by the force applicator. The invention has the advantages of high measurement precision, wide measuring range, strong versatility and the like.

Description

technical field [0001] The invention belongs to the technical field of micro-thrust measurement, in particular to a micro-thrust measurement technology based on a thrust platform. Background technique [0002] When the measured thrust range is in the Newton level, the external noise input of the measuring instrument has relatively little influence on the precision of the thrust sensitive device. However, when thrust levels drop into the low millinewton and sub-millinewton range, the amplitudes approach vibration amplitudes produced by factors such as building vibrations, highways, people's footsteps that occur every day and are usually ignored. In some cases, these effects generate forces that are even greater than the output of some microthrusters. [0003] Although some direct microthrust diagnostic techniques exist, such as force transducers and plume flux measurements, etc. But these direct measurement methods have difficulties when thrust or impulse levels are low. T...

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Problems solved by technology

The common problem of Documents 3 and 4 is that the measuring range is too narrow, and there is translational motion in addition to the rotation of the suspension wire, which will affect the measurement of the rotation angle. In addition, the bearing capacity of Document 3 is relatively small (0.45kg), and the calibration is not flexible and convenient.

The main problem of Document 5 is that the measuring range is too large, which is not suitable for the thrust measurement of the μN level (mainly judged from the resolution (1μm) and typical measurement value (greater than 30mN) of the capacitive displacement sensor), and the system design is relatively rough and does not have Capabilities such as leveling and crossbeam matching have an impact on measurement results

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