Ask Question, Ask an Expert


Ask Mechanical Engineering Expert

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

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.

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:



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

Problem 1 -there is a circular combined open and closed

Problem 1 - There is a circular combined open and closed thin-walled section as shown in the figure. (R = 100mm, t = 2mm, S y = 100N) When shear force S y is applied to Web 24, calculate: a) Calculate I xx for the x-axis ...

The tires of the 4555-lb sedan are 65 in wide figure p510

The tires of the 4555-lb sedan are 6.5 in. wide (Figure P5.10). Each tire contacts the ground over a distance of 4.25 in. as measured along the vehicle's length. Calculate the compressive stress between each tire and the ...

For a deck supports of length 325 m are proposed to be

For a deck, supports of length 3.25 m are proposed to be built from aluminum with a Young's modulus of 72 GPa and a yield stress of 480 MPa. A cylindrical design is proposed with outer diameter d = 100 mm and wall thickn ...

For the experimental pump data given belowqflow rate

For the experimental pump data given below: Q F low Rat e ( ???? /s) ???? Total Pressure (kPa) P IN Shaft power (kW) 0.0000 504.82 1.190 0.0004 481.50 1.318 0.0008 476.70 1.573 0.0012 471.50 1.828 0.0017 461.00 2.083 0.0 ...

A domestic food freezer maintains a temperature of - 15degc

A domestic food freezer maintains a temperature of - 15°C. The ambient air temperature is 30°C. If heat leaks into the freezer at the continuous rate of 1.75 kJ/s what is the least power necessary to pump this heat out c ...

There are 3 x 103 spheres in a box calculate the number of

There are 3 x 10 3 spheres in a box. Calculate the number of different combinations for the spheres in order to have 1100 spheres in the front third of the box. Assuming that the distribution is normal, calculate the pro ...

Project solve the 3-dimensional steady state heat transfer

PROJECT Solve the 3-dimensional, steady state heat transfer problem for a cartesian system either numerically or analytically. - If you use the numerical method, write a computer code using the finite difference method o ...

1 using the expression for the gradient in polar

1. Using the expression for the gradient in polar coordinates (Appendix A), find the gradient of ψ(r,θ) when Where is the gradient maximum? The terms A and a are constant. 2. Given the following expression for the pressu ...

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 ...

Example how an p-channel flash eprom would work is the

Example how an p-channel flash EPROM would work. Is the p-channel worse or better than the n-channel asides form speed? Estimate the write and erase times (using the Fowler-Nordheim tunneling formulae for a triangular ba ...

  • 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

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

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen