CN105486484A - Pylon pitching modal simulation device suitable to be used for flutter wind tunnel model - Google Patents

Abstract

The present invention is a hanger pitch mode simulation device suitable for flutter wind tunnel models, characterized in that it comprises: hanger beam [1], pitch support arm [2], external hanger beam [3], pitch rotation axis [ 4], spring leaf adjusting screw [5], pitch spring leaf [6], pylon connection joint [7], wing beam frame [8], pylon beam [1] fixed on the pylon connection joint [7] On the wing beam frame [8], the upper part of the pitch arm [2] is connected with the pylon beam [1] through bolts, and the lower part of the pitch arm [2] is connected with the external beam [3] through the pitch rotation axis [4]. The beam [3] can rotate around the pitch rotation axis [4]. The pitch spring [6] is connected to the hanger beam [1] and the external beam [3] through the spring adjustment screw [5], and the spring adjustment screw [ 5] Adjust the pitch spring [6] position.

Description

A pylon pitch mode simulation device suitable for flutter wind tunnel models

technical field

The invention belongs to the technical field of aeroelasticity test, and in particular relates to a hanger pitch mode simulation device suitable for a flutter wind tunnel model.

Background technique

The external objects on the wing of the aircraft have a great influence on the flutter of the wing, such as the engine of the transport aircraft, various missiles and auxiliary fuel tanks carried by fighter jets. The modes (pitch, yaw, side level) of the external store, especially the pitch mode, often participate in the flutter of the wing. Usually, when designing the flutter model, it is required to simulate the mode of the external store, especially the pitch mode. In the past, the external suspension was simulated in the form of a composite beam frame, which would cause the pitch mode of the external suspension to couple with the other two modes, which brought difficulties to the mode identification. To adjust the frequency of the external suspension of the model, it was necessary to replace the entire external suspension beam .

Contents of the invention

The purpose of the present invention is to provide a pylon pitching modal simulation device suitable for flutter wind tunnel models. When carrying out flutter tests with external wings, the present invention can simulate the pitching model of external objects and can be adjusted randomly. The pitch frequency of the external store.

The technical solution of the present invention is: a hanger pitch mode simulation device suitable for flutter wind tunnel models, characterized in that it includes: hanger beam [1], pitch support arm [2], external hanger beam [3] , the pitch rotation shaft [4], the leaf spring adjustment screw [5], the pitch spring leaf [6], the pylon connection joint [7], the wing beam frame [8],

The hanger beam [1] is fixed on the wing beam frame [8] through the hanger connection joint [7], the upper part of the pitch arm [2] is connected with the hanger beam [1] through bolts, and the lower part of the pitch arm [2] The external beam [3] is connected to the external beam [3] through the pitch rotation axis [4], and the external beam [3] can rotate around the pitch rotation axis 4,

The pitch spring [6] is connected to the hanger beam [1] and the external beam [3] respectively through the spring adjusting screw [5], and the position of the pitch spring [6] is adjusted through the spring adjusting screw [5].

Further, the pitch rotation axis [4] is connected to the center of gravity of the external hanger beam [3].

Further, the pitch spring [6] is a U-shaped spring.

The advantage of the present invention is that the present invention simulates the stiffness of the external model in the pitch direction through a set of bearings and spring sheets, so as to realize the decoupling of the stiffness of the external model in the pitch direction and the stiffness in the other two directions, and can be achieved by replacing the spring sheets. Adjust the pitch frequency of the plug-in, reduce the difficulty of model installation, save test costs and debugging time.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a partially enlarged schematic view of the present invention;

Among them, 1-pylon beam, 2-pitch arm, 3-external beam, 4-pitch rotation shaft, 5-spring adjustment screw, 6-pitch spring, 7-pylon connection joint, 8-wing beam shelf.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings, please refer to Fig. 1 to Fig. 2 .

A hanger pitch mode simulation device suitable for flutter wind tunnel models, characterized in that it includes: hanger beam 1, pitch support arm 2, external hanger beam 3, pitch rotation axis 4, spring leaf adjustment screw 5, pitch Spring leaf 6, pylon connection joint 7, wing spar frame 8,

The pylon beam 1 is fixed on the wing beam frame 8 through the pylon connection joint 7, the upper part of the pitch arm 2 is connected with the pylon beam 1 through bolts, and the lower part of the pitch arm 2 is connected with the external beam 3 through the pitch rotation shaft 4, and the pitch The rotating shaft 4 is connected to the center of gravity of the external hanging beam 3 . The external hanger beam 3 can rotate around the pitch rotation axis 4 , which can simulate the pitch mode of the external hanger, and the pitch stiffness is provided by the pitch spring 6 . The pitch spring leaf 6 is a U-shaped spring leaf. The pitching spring 6 is connected to the hanger beam 1 and the external beam 3 respectively through the spring adjusting screw 5, the position of the pitching spring 6 is adjusted through the spring adjusting screw 5, and the pitching spring 6 is fixed by the bolt on the spring adjusting screw 5 s position. When the pitch frequency of the external hanging beam 3 needs to be adjusted, the bolt on the spring leaf adjusting screw rod 5 is unloaded first, and the pitch spring leaf 6 is replaced.

Claims (3)

1. one kind is applicable to the hanger pitching mode analogue means of flutter wind tunnel model, it is characterized in that, comprise: hanger beam [1], pitching support arm [2], support strut [3], pitching turning axle [4], spring leaf adjusting screw(rod) [5], pitching spring leaf [6], hanger jointing [7], spar frame [8]

Hanger beam [1] is fixed on spar frame [8] by hanger jointing [7], pitching support arm [2] top is connected with hanger beam [1] by bolt, pitching support arm [2] bottom is connected with support strut [3] by pitching turning axle [4], support strut [3] can rotate around pitching turning axle [4]

Pitching spring leaf [6] is connected with support strut [3] with hanger beam [1] respectively by spring leaf adjusting screw(rod) [5], regulates pitching spring leaf [6] position by spring leaf adjusting screw(rod) [5].

2. the hanger pitching mode analogue means being applicable to flutter wind tunnel model according to claim 1, it is characterized in that, pitching turning axle [4] is connected to the centre of gravity place of support strut [3].

3. the hanger pitching mode analogue means being applicable to flutter wind tunnel model according to claim 1, it is characterized in that, pitching spring leaf [6] is U-shaped spring leaf.