SU62823A1 - Artificial vibration device - Google Patents

Description

Fluctuations of flutter can be of great importance for the operation of the wing or tail of an aircraft. Flutter is detected either by artificial excitation of oscillations in the wing or tail, or by shock: on the wing.

The device proposed according to the invention allows flutter to be investigated by any of the indicated methods, i.e., by the excitation of vibrations and shock.

To create artificial vibrations of the wing or tail of the aircraft in the Instrument, a cylinder is used, provided with grooves for controlling the mutual arrangement of loads that create an imbalance when the rods of the rods pass through the slots of the cylinder and are freely attached to its shaft.

The device device is shown in the drawing. The device consists of a hollow cylinder with a shoulder on the side of the bottom mounted on the slits 9 on the shaft 7. The shaft is driven in rotation by a DC motor. The cylinder can move freely on the slots along the axis of the shaft and has two screw grooves 10, which include levers / weights. The levers // are hingedly connected to the sleeve 12, which is freely seated on the shaft /, adjacent to the stop disc, in which the spring 4 rests against the bearing 7.

In the shoulder of the cylinder 2 includes a fork swivel on the axis of the arm 8 of the lever 5, the end of which is pressed by the spring 4 to the profile of the cam washer 6.

The washer 6 is rotated from the cockpit. When rotating the cam disc 6, the cylinder 2 will simultaneously rotate with the shaft / and move non-axially from one extreme position to the other. When cylinder 2 rotates, it rotates the levers 11 with weights 3 with its screw grooves, forcing them also to rotate and develop centrifugal force as a function of the angle and divergence of the levers. Due to the fact that the grooves 10 are screw-shaped, with axial movement of the cylinder 2, the angle and, therefore, the distance of the weights 3 from the shaft axis / and the magnitude of the centrifugal force developed by the weights 3; an imbalance is created that entails

No. 62823

for a change in the amplitude of oscillations. Thus, a flutter test using the first method is carried out with a very simple mechanism.

If it is necessary to use the impact method, the cam washer 6 is set so that the end B of the lever 5 is located on the edge A of the protrusion of the washer 6. With a further sudden rotation of the cam washer 6, the lever 5 will be broken and the spring 4 will almost instantly dissolve the loads 3 by 180 ° , since the grooves 10 allow the weights to disperse by 180 ° or less. Such a rapid divergence of loads by 180 ° will balance their centrifugal forces, i.e., it removes the imbalance, which will be similar to the effect of a blow.

If it is necessary to change the magnitude of the impact, then this can be achieved by rearranging the bracket 8.

Subject invention

Claims (2)

1. A device for creating artificial vibrations, characterized by the use of a controlled spring-loaded and rolling cylinder along the shaft, provided with grooves for controlling the mutual arrangement of loads, creating an imbalance of the desired value when the supporting rods passing through the slots of the said cylinder are rotated freely on the shaft. 2. The form of the apparatus according to claim 1, which is based on the use of a cam and a lever interacting with it and with a cylinder to create a shock and a sudden mutual balance of the loads. f 3