No. 65 (00186)

Family name : Bogacheva
Given name : Nadejda
Affiliation : Saint-Petersburg State University of Aerospace
              Instrumentation
Abbreviation : SUAI
E-mail address : az@aanet.ru
Title : THE NIBIUM: BRAKING PROCESS MODULAR MODEL
Authors : N. Bogachieva, E. Telizina, A. Zhukov
Abstract : 
Purpose

Braking process modular model (BPMM) NiBiuM is a program of the analysis
of dynamic processes occurring in a wheel braking system when an
airplane Is in the braking state; it is intended for developing,
adopting and comparing new antilock braking systems (ABS). The BPMM
NiBiuM application cuts down a volume of flight tests, thus reducing
expenses for the development of an ABS and a time necessary for
designing.

Problem Mathematical Definition

This model describes a closed control loop incorporating an object of
control. an actuating device and an electronic control. The object of
control model describes the airframe and undercarriage dynamics,
including elastic tyros. The actuating device model incorporates models
of the pressure remote control and the multitask friction brake. The
electronic control model implements a control law. produced by the ABS.
While simulating the TU-330 airplane landing the wheel braking system
dynamics was described by a system of differential equations of the 66th
order with 32 non linearities.

State and Prospects

The reliability of results is confirmed by the comparison of results
received with that of flight tests of IL-96-300. TU-204, TU-334 and
AN-77 airplanes.  Landing of TU-334 and “Irbis” (a business
class airplane) airplanes has been simulated. Works for extending the
model to airplanes of other classes are underway now for certain Russian
customers. The BPMM NiBiuM is being operated in Moscow in
“Rubin” Aviation Corporation and “Tupolev&#8221 ;
Company, in Bench for Aircraft ABS in Korea Electrotechnology Research
Institute.

It is expedient to introduce into this study the 3rd dimension and
extend a spectrum of objects which can be designed with the aid of the
BPMM NiBiuM and an initial data bank for new types of airplanes and
their structural elements, as well as to extend the results to the
investigation of the ABS dynamics of automobiles.

Program Structure and Interface

BPMM NiBiuM has been designed in compliance with the modular principle:
it consists of an assemblage of modules of different degrees of detail
with unified input/outputs, this making it possible to modify the model
structurally and parametrically by means of a dropping menu and in the
process maintaining the correctness of a system of differential
equations, which describes the braking dynamics. The menu is supported
by a contextually-dependent HELP.  Program has been written in Delphi 7.