Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Mechanical Engineering Expert

Assignment: Isolation and Fault Detection for Lateral Flight of an UAV
 
Introduction:

Fault tolerance is very significant for aircraft flight control.  The majority of the faults take place in the actuators and sensors onboard the aircraft.  Once a fault has occurred the aircraft could become uncontrollable and be hazardous to passengers and crew.  This assignment is to examine the effects of sensor faults on the lateral dynamics of an Unmanned Aerial Vehicle.

Background
Lateral Dynamics

The Lateral Dynamics of any aircraft are defined in terms of the Body-fixed velocities and corresponding Earth-fixed orientation (see Figure).

226_figure lateral dynamics.png

 

In this specific case the velocities are roll rate (p) and yaw rate (r).  All other Body-fixed dynamics are regarded as constant (e.g. surge velocity) or zero.  The effects of such velocities on to the initially fixed Earth-fixed axes are represented through the orientation of the aircraft.

These are the roll angle (φ) and yaw angle (ψ).  In addition, the affect of sideslip on the aircraft is included in the form of the sideslip angle (β).

The corresponding inputs to the lateral dynamics of the aircraft are the aileron deflection (δa) and the rudder deflection (δr).  The ailerons control the roll motion and the rudder controls the heading or yaw. The Lateral Dynamics of an UAV can be represented by the following differential equations:

520_equation.png

 

Here the translational velocities are find outd in m/s, rotational velocities in rad/s and the angles in radians.  The constant value for the surge velocity is taken to be U0 = 30 m/s.

In addition to the flight dynamics, this aircraft representation also consists of the dynamics of the aileron and rudder actuators.  Both actuators have a maximum amplitude deflection of 25 degrees and a maximum rate limit of 5 degrees/second.

Faults in Lateral Dynamics

The faults in the Lateral Dynamics of an aircraft can be either multiplicative or additive. The multiplicative faults occur in the dynamics of the aircraft and can be caused by changes to the aircraft itself throughout flight.   These types of faults are not considered here. Instead, additive faults caused by the sensors in the system will be the main focus of this assignment.  In particular faults which occur on the heading channel which are added to the sensed dynamics from the aircraft shall be the subject of this study.

Problem Specification

The following stages are expected to be performed in this assignment:

problem1.  Construct a continuous time simulation of the Lateral Dynamics of the UAV using zero initial conditions.

problem2.  Simulate a suitable man oeuvre where changes in heading can be observed (e.g. zig-zag).

problem3.  Simulate three separate stepwise faults in the heading channel of magnitudes 2, 5 and 10 degrees.

problem4.  Simulate a separate drift wise fault in the heading channel.

problem5.  Analyses the effect of these separate faults.

problem6.  Using a suitable limit checking method, detect these faults in the system.

problem7.  Using a suitable fault diagnosis method, diagnose these faults.

problem8.  Repeat this investigation with simulated white noise of amplitude ±5degree included in the heading output of the system.

problem9.  describe how the FDI system has to be altered to accommodate the existence of noise.

problem10. Comment on the influence of the faults and the FDI system on the Lateral Dynamics if a heading control system was employed.

Mechanical Engineering, Engineering

  • Category:- Mechanical Engineering
  • Reference No.:- M9547

Have any Question? 


Related Questions in Mechanical Engineering

Whats the maximum proof strength in ksi of a j429 gr 8 bolt

What's the maximum proof strength (in ksi) of a J429 GR 8 bolt and that of an ASTM A490 bolt? What's the proof strength of a metric Class 10.9 bolt in MPa? What is the ultimate strength and the yield strength (in MPa) of ...

The figure illustrates the operation of an air lift pump

The figure illustrates the operation of an air lift pump. Compressed air is forced into a perforated chamber to mix with the water so that the specific gravity of the air-water mixture above the air inlet is 0.5. Neglect ...

If the speed of the shaft is doubled in given problem what

If the speed of the shaft is doubled in given Problem, what will be the percentage increase in the heat transferred from the bearing? Assume that the bearing remains at constant temperature. Problem An automobile cranksh ...

1 a beaker has the shape of a circular cone of diameter 7

1. A beaker has the shape of a circular cone of diameter 7 in and height 9 in. When empty, it weighs 14 oz; full of liquid, it weighs 70 oz. Find the density of the liquid in both SI and U.S. customary units. 2. Some exp ...

While brewing beer a delinquent professor finds it

While brewing beer, a delinquent professor Finds it necessary to rapidly cool the "wort," a fermented malt mixture, from near the boiling point of water to room temperature. A 5.7 L sample of the wort at 363 K is combine ...

Using the equations for stress transformationa confirm the

Using the equations for stress transformation, a. confirm the angles that define the planes of maximum and minimum shear stress b. determine the maximum and minimum values of the shear stress

An athlete at high performance inhales of air at 100 atm

An athlete at high performance inhales of air at 1.00 atm and 298 K. The inhaled and exhaled air contain 0.50 and 6.2% by volume of water, respectively. For a respiration rate of 32 breaths per minute, how many moles of ...

Sea water rho 1025 kgm3 flows through a pump at 021 m3s

Sea water, ρ = 1025 kg/m 3 , flows through a pump at 0:21 m 3 /s. The pump inlet is 0.25 m in diameter. At the inlet the pressure is -0.15 m of mercury. The pump outlet, 0.152 m in diameter, is 1.8 m above the inlet. The ...

In practice how could you measure that much stretch in a

In practice, how could you measure that much stretch in a bolt of this size? The bolt of problem is put in service and its temperature rises to 2508F. How much change in length of the bolt would you expect this increase ...

If you could go back in time and be part of any engineering

If you could go back in time and be part of any engineering achievement in the past, what would you choose? Your choice must involve something that was accomplished before 1970, although it might still be in use today. Y ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro