Friction Loading Device for Load Simulation of Front Swing Center Nozzle

Abstract

The invention belongs to a friction loading device and specifically discloses a front-oscillation center spray pipe load simulating friction loading device. The device comprises a friction loading hydraulic system and a friction loading mechanism; the friction loading hydraulic system comprises an oil source, a high-pressure ball valve, a high-pressure filter, a proportional pressure reducing valve and an electromagnetic directional valve; the oil outlet of the oil source is communicated with one end of the high-pressure ball valve by use of a pipeline, the other end of the high-pressure ball valve is communicated with one end of the high-pressure filter by use of a pipeline, the other end of the high-pressure filter is communicated with one end of the proportional pressure reducing valve by use of a pipeline, and the other end of the proportional pressure reducing valve is communicated with one end of the electromagnetic directional valve by use of a pipeline; the other end of the electromagnetic directional valve is communicated with the input end of the friction loading mechanism; the friction loading mechanism comprise an outer barrel, a supporting barrel, a friction disc, a rear end cover, a bearing, a hydraulic cylinder, a fixed friction assembly, a movable friction assembly and a rotating shaft. The front-oscillation center spray pipe load simulating friction loading device is capable of simulating the friction load characteristics of a front-oscillation center spray pipe, and is high in friction torque loading accuracy and good in loading stability.

Description

technical field [0001] The invention belongs to a friction loading device, in particular to a friction loading device for simulating the load of a front swing center nozzle. Background technique [0002] Compared with the servo system characteristics of the front swing center nozzle and the rear swing center nozzle, the structural stiffness is about 6.476×10 6 N / m, the equivalent mass is 336.6kg; the rear swing center nozzle servo system has a structural rigidity of 1.0×10 7 N / m, the equivalent mass is 192.7kg. From the analysis results, the resonant frequency of the servo system of the front oscillating nozzle is significantly lower than that of the rear oscillating nozzle, from 220rad / s to 140rad / s; while the resonance peak is higher, increasing from 1.5dB to 3dB; The phase lag of the front oscillating nozzle servo system is significantly higher than that of the rear oscillating nozzle servo system. Taking the system characteristic angular frequency point ω=20rad / s as an...

AI Technical Summary

Problems solved by technology

This brings great difficulties to the design of the load simulation system.

The existing load platform using open-loop loading technology has low friction torque loading accuracy, or poor loading stability, and crawling phenomenon occurs during operation, which cannot simulate the load characteristics of the front swing center nozzle

Although the load table using passive hydraulic loading technology has high loading accuracy, the servo mechanism cannot accurately load the friction torque during dynamic tests such as transient characteristics.

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