Axle-system axial pulsating force measurement device

Abstract

The invention relates to an axle-system axial pulsating force measurement device, which is applicable for measurement of axial pulsating force and axial thrust and is characterized in that the device comprises a first positioning flange and a second positioning flange; the first positioning flange and the second positioning flange are fixedly arranged on an axle with certain spacing between; two dowel bars are symmetrically arranged and are respectively sheathed in a chute of the second positioning flange in a sliding way; four force reeds are arranged at two sides of the second positioning flange in a two-to-two symmetrical way; four strain gauges are arranged on the force reeds in an attaching way and adopt full-bridge connections among each other, and output ends thereof are connected with a telemetering data collection system. The invention provides the measurement device with simple structure and high measurement precision for pulsating force measurement, adopts microstrain measurement technology combining mechanical amplification and full-bridge connection of strain gauges, precisely measures the axial pulsating force of the axle system and provides precise parameters for the improved designing for reducing vibration noise of the axle system and related components.

Description

technical field [0001] The invention relates to a measuring device, in particular to an axial pulsating force measuring device for measuring a shaft system, which can be used for measuring the axial pulsating force and also for measuring the axial thrust. Background technique [0002] When ships and warships are sailing, the vibration and radiation noise of the stern are closely related to the complex structure of the stern, the main propulsion device and the wake field of the stern. Due to the inhomogeneity and unsteadiness of the propeller incoming flow, the hydrodynamic pulsation component acting on the propeller blades not only causes the propeller to directly radiate sound, but also excites the vibration of the bilge plate and blades above the propeller, which is transmitted through the shafting and bearing housing structure to the hull structure, causing stern vibration and radiating noise into the water. The measured data show that at low speed (4 knots), this part o...

AI Technical Summary

Problems solved by technology

Since it is difficult to directly measure the propeller's unsteady force on a real ship, the axial pulsation force transmitted on the measuring shaft can only be used to convert the propeller's unsteady force

However, foreign propeller data show that the amplitude of the pulsation component of propeller axial excitation is about 6‰ of its static thrust component, and the dynamic strain of the shafting caused by it is extremely small and superimposed on the large static strain. Therefore, it is difficult to Acquisition of propeller axial pulsation force parameters using traditional direct strain measurement method

Foreign countries have been researching the measurement of the axial vibration excitation force of the shafting system. In China, no real ship or actual ship test research has been conducted on the propeller axial vibration force, and there is still a lack of propeller unsteady excitation force and thrust bearing dynamic stiffness. Therefore, for the forecast analysis of the low-frequency noise components caused by the propeller passing through the shafting to excite the hull structure, there is a lack of accurate input, thus hindering the quantitative evaluation of the propeller-excited shafting and the vibration noise of the stern structure and further research on control

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