Thrust rack in-situ calibration system

Abstract

The invention discloses a thrust rack in-situ calibration system, which comprises a standard sensor assembly, a hydraulic system and a loading and unloading control system, wherein the standard sensor assembly comprises a sensor pull rod, a front universal flexible element, a standard sensor and a back universal flexible element, the hydraulic system comprises a hydraulic cylinder, a press cavity oil filling valve, a hand lifting pump, a pulling cavity oil filling valve, an electric joint pressure meter and a pressure cavity energy accumulator, the loading and unloading control system comprises a self control pump, a wide frequency servo motor, a pulse automatic tracking system, a computer and a collecting card, the in-situ thrust calibration system controls the work of the self control pump through the pulse automatic tracking system and the wide frequency servo motor, in addition, measurement signals of the standard sensor are fed back to the computer, the computer transmits the pulse signals to the pulse automatic tracking system through software operation, the automatic loading and unloading on the standard sensor by the hydraulic cylinder is realized, in addition, the necessary time can be stabilized, the loading stability can reach 0.004 percent F.S per 30 minutes (or longer time).

Description

technical field [0001] The invention relates to an in-situ calibration system of a thrust bench, which belongs to the technical field of aerospace engine testing. Background technique [0002] During the test run of the rocket engine, the basic method of thrust measurement is to fix the engine on the moving frame of the thrust frame, and the moving frame and the fixed frame of the thrust frame are connected by spring plates. During the test run, the thrust generated by the engine makes the moving frame and the engine They move together in the thrust direction and act on the load cell through the force transmission mechanism. The thrust frame mainly consists of three parts, one is the thrust transmission mechanism, which is composed of a fixed frame, a moving frame, a spring leaf and pre-tightening force components, etc.; the other is a measuring device, including a working force sensor, a transmission cable, and a data acquisition device; the third is On-site calibration de...

AI Technical Summary

Problems solved by technology

The advantage of the mechanical type is high loading accuracy and simple design; its main disadvantage is that it takes time and effort to load large tonnage and is limited by the site

The main advantage of the hydraulic type is that it is easy to load, small in size, light in weight, and the loading range is much larger than the weight loading range; its main disadvantage is that the loading pressure is unstable, easy to produce impact, damage the sensor, and the loading accuracy is not easy to guarantee

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