Cascade type reverse thrust device multi-rigid-body dynamics simulation analysis method

Abstract

The invention belongs to the technical field of engine reverse thrust device design, and relates to a cascade type reverse thrust device multi-rigid-body dynamics simulation analysis method. The method comprises the steps of determining the motion relation of all components of a blade grid type reverse thrust device and loads in the working process of the blade grid type reverse thrust device; determining the relative coordinates of each part of the blade grid type reverse thrust device; applying constraint to all components of the blade grid type reverse thrust device; carrying out load loading on loaded surfaces in sequence according to the stroke step length, and obtaining distributed aerodynamic loads equivalently acting on the surface of the choke valve through constraint counterforceand moment of force of the middle point of the lower edge of the choke valve; interpolating the discrete load obtained according to the step length to obtain a load curve changing along with the reverse thrust stroke; adding a drive to an actuator cylinder acting on the choked flow door; and performing simulation solution output. According to the invention, the motion characteristics and load transmission characteristics of the reverse thrust motion mechanism in the working process can be obtained, so that the improvement work of the design is fully supported by data.

Description

technical field [0001] The application belongs to the technical field of engine thrust reverser design, and in particular relates to a multi-rigid body dynamics simulation analysis method for a cascade thrust reverser. Background technique [0002] Due to the continuous increase of the carrying capacity and flight speed of modern transport aircraft, the required run distance for takeoff and landing is getting longer and longer. There are many common deceleration methods for transport aircraft, among which the engine thrust reverser device with many advantages has been most widely used in military and civilian transport aircraft. [0003] The thrust reverser is a cluster space mechanism composed of complex multi-parallel space mechanisms. It has a complex structure, involves performance parameters, and a large number of components, reaching hundreds of components. It is a very difficult task to construct an accurate multi-rigid body dynamic model. Most of the research on the...

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Problems solved by technology

At present, most of the research on the dynamic characteristics of the thrust reverser relies on the ground test run test, which has a long test cycle and high cost. At the same time, it is difficult to obtain the load and force transmission characteristics of each link of the thrust reverser motion mechanism through the test drive test. , which seriously restricts the comprehensive understanding of product performance, and also makes the design improvement work lack sufficient data support

[0004] In the past, the research on the thrust reverser mainly focused on the static load analysis of the finite state, and no data and patents on the dynamic research of the thrust reverser were found.

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