Fig 9 - uploaded by Md Shakibul Haque
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Bucket target type thrust reverser system using deflector doors which are installed after nozzle of a jet engine.
Source publication
![Fig. 1 : A KLM with reverse thrust buckets (left) [6] and Northwest...](profile/Md-Haque-149/publication/288737295/figure/fig1/AS:324709313990674@1454428141718/A-KLM-with-reverse-thrust-buckets-left-6-and-Northwest-DC9s-used-to-pushback-with_Q320.jpg)
Through this paper an initiative is taken to put focus on a special
technique of thrust reverser mechanism which is common to the
aviation industries but an uncommon in general. In this technique,
forward thrust produced by jet engine of aircraft is diverged to reverse
direction so as to provide an additional braking effect during landing
and power...
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Citations
... The speed limit is a key factor for a particular aircraft engine in order to ensure its effective operation on ground and this value should be specified from the beginning. For some turbo fan [67]. It is recommended that early selection of normal reverse thrust is desirable for proper operation of the thrust reverser. ...
The common problem that encountered in reverse thrust system of an aircraft is the tendency
to open on air and this is the main causes of accidents. It has fully automated central controller
but in some cases it can’t guarantee the smooth operation of reverse thrust and most of the pilots
are advised or ordered to de-activate the system. The main purpose of this thesis is on how to
model, simulate and design the electro-hydraulic servovalve control system of reverse thrust of a
particular engine with position control at the effective angles ranging from 0o to 15o .This range
is assumed the safest actuation angle with no effect on thrust force as well as momentum
whereas at larger angles the airplane is already out of control in case with defected or
uncommanded reverser thrust. At the end of this thesis we will able to select the controllers
which will able to solve or inform the system malfunction automatically by sensing the position
of the actuator at the respective actuation angles.
In order to simulate the position servo control and analyze the system using PID controllers
we need to design a model of actuator-servo valve system for the reverse thrust hydraulic system.
Model design analysis is with position servo to improve the control of reverse thrust as well as to
sense every movement of the two actuators of each reverse thrust. This helps us early control of
the actuators in cases when two actuators moved xp approximate distance while the other two not
deployed. The control is automatic shutdown of reverse thrust system to prevent moment
unbalance of the aircraft. To simulate the Simulink model of thrust reverser position servo
system; it is necessary to correlate the relationships between actuation angle, engine thrust and
actuator position and to model Electro-hydraulic servovalve control with position servo for the
whole system.
Electro-hydraulic servo system modelling for thrust reverse in this thesis paper is mainly on
the modeling of EHSV at the specific door positions with different load effect. Coupling of the
two synchronized actuators and the mathematical modeling of the actuator position with a load at
60o door position for reference and approximating it to a safer value where door opening hasn’t
effect on reverse thrust. Finally to model a system and its safest actuator position with model
design verification analysis by MATLAB Simulink design verifier.
Key words: Electro-hydraulic servo control; Position servo; Target-type thrust reverser; PID
controller; Model design verification.
... 'As per the geometry of jet engine, maximum thrust is available only at the exit of the nozzle. It will be better to install reversers at the position where maximum forward thrust is available' [45]. The design chosen by this paper is that of the hot stream clamshell door system because it provides a good compromise between simplicity (highest for cascade type) and power (highest for bucket target type). ...
... Left -engine and clam reverser diagram of main components[45], right -reverse thrust in nominal position on a RR725 engine[46]. Both are an accurate representation of the engine to be used. ...
The following paper constitutes the final report on the design of a twin turbofan transcontinental business jet. The cabin layout has been chosen and the fuselage dimensions deduced. Furthermore, an optimum aerofoil design was identified and the dimensions of the wing and those of the high lift devices were calculated. The incorporation of novel ideas such as a windowless CFRP fuselage and fuselage-mounted engines are analyzed further in this paper. The selection and integration of propulsive systems as well as their impact on aircraft drag and weight are considered. Control surfaces have also been designed to be fit for safety and appropriate maneuverability. Finally, an aerodynamic analysis as well as performance and cost preliminary evaluation were carried out. Both the validity of the assumptions made and their impact on preliminary results were identified.
