Rotation load applying device for tail rotor shaft fatigue test

Abstract

The invention provides a rotation load applying device for a tail rotor shaft fatigue test so as to determine fatigue performance and weak parts of a tail rotor shaft and provide a basis for determining service life of the tail rotor shaft. The technical scheme of the invention is as follows: first, second, third and fourth hydraulic actuators are connected with a loading disc through rotation moment loading joints and are perpendicular to the disc surface of the loading disc; the first, second, third and fourth hydraulic actuators are symmetrically arranged around a tail rotor shaft test member with the same arm of force; a fifth hydraulic actuator and a sixth hydraulic actuator are connected through two support arms of a rotation shear loading joint and the loading disc which are 90 degrees from each other, and are parallel to the disc surface of the loading disc; the tail rotor shaft test member is secured to a test bed through an upper support bearing fake piece and a lower support bearing fake piece; the upper part of the tail rotor shaft test member is connected with the lower part of a tail decelerated output flange plate; and the upper part of the tail decelerated output plate is connected with the loading disc.

Description

technical field [0001] The invention belongs to the fatigue test technology of the tail rotor shaft of a helicopter, and relates to a rotating load applying device for the fatigue test of the tail rotor shaft. Background technique [0002] The single-rotor with tail rotor type is the most widely used form of helicopters in the world at present. The anti-torque of the main rotor is balanced and the heading control of the helicopter is realized through the rotation of the tail rotor shaft to drive the tail rotor to rotate. The tail rotor shaft is a typical complex moving part in the tail drive system of a helicopter. It bears the combined action of various loads such as rotational bending moment, torque, and tail rotor thrust during flight. Its force situation is complicated, and fatigue damage is the main failure mode. Its working reliability directly affects the flight safety of the helicopter. In order to ensure its good performance and reliability of use, its load and str...

AI Technical Summary

Problems solved by technology

[0003] Existing test devices of similar products use a single arm to load separately, which cannot simulate the periodically changing load of rotating parts

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