Features and modernization methods of thrust measurement devices for liquid rocket engine test stands

During the liquid rocket engines (LRE) testing, direct thrust measurement is carried out using thrust measurement devices. The aim of the work was, on the basis of existing data from the theory of tests and test stands devices, to highlight the design features of the thrust measurement devices and propose an option to improve the performance of this stand system. The work considers the basic circuit power schemes of thrust measurement devices by the example of power measuring systems of existing fire test stands and the features of work on preparing systems for testing. The types of calibration systems worked out in practice, their advantages and disadvantages, which constitute calibration errors, are considered. An option is proposed to modernize thrust measurement devices, in particular, through implementing of an electromechanical drive based on a planetary roller-screw mechanism as a force setting element into the calibration system. A possible general conceptual diagram of the power drive operation as a part of the calibration system of the thrust measurement devices is given. The advantages and disadvantages, the predicted effects of implementation are considered. A more detailed analysis of this proposal may serve as an occasion for the modernization of the specific operational thrust measurement devices design at the fire test stand for LREs or may be a working option when designing a new thrust measurement device.