A device for measuring the tiny thrust of an engine with an adjustable range

Abstract

The invention relates to a range-adjustable device for measuring small pushing force of an engine. The range-adjustable device comprises a base, a vertical beam, a step supporting shaft, a bearing, a transverse beam, a propellant storage box, a balance weight, an electric cabinet, a force sensor, a force sensor fixing support, a signal processing unit and a computer. The range-adjustable device is characterized in that the bearing structure is adopted, the dead load of the engine is balanced by the balance weight, the range is changed by changing a specific value of a force arm of the engine to a force arm of the sensor, a propellant pipe is directly connected with the step supporting shaft, propellants flow through a propellant flowing way of the step supporting shaft, and influences of the propellant pipe and a control line on the accuracy are eliminated by reducing the force arm. When the measured pushing force is changed from the micro-Newton order to the milli-Newton order, the null point drifting is smaller than +-0.5%F.S. per hour, steady state measuring errors are smaller than +-1% of the full range, and the dynamic response delay time is shorter than 15 ms. The measuring device is simple and reliable in measuring process, good in repeatability and capable of meeting the requirement for measuring the small pushing force of the engine.

Description

technical field [0001] The invention relates to a force measuring device, in particular to a high-precision measuring device for the tiny thrust of an engine, which belongs to the technical field of force measurement. Background technique [0002] The rapidly developing micro-satellites and their networking technologies are widely used in many fields such as data communication, data transmission, ground environment monitoring, space environment observation, navigation and positioning, and scientific experiments. Compared with medium and large satellites, small satellites, microsatellites and miniature planetary probes put forward higher requirements for the quality, volume and efficiency of the propulsion system on the star. When performing satellite attitude control, orbit control and constellation position maintenance, the required The thrust is very small, reaching the mN or sub-mN level, and the precise control of the small satellite is realized through the jet medium of...

AI Technical Summary

Problems solved by technology

However, this device still has some problems and inconveniences in the field measurement, such as: too high requirements for the operation of the testers, the influence of the handling process and the engine installation process on the measurement system, and the zero point changing too much every time the equipment is started. In the actual test process, it is necessary to further improve and improve the performance and ease of operation of the equipment

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