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

Speed control of motors ac motors as well as dc motors can

Speed control of motors (ac motors as well as dc motors) can be accomplished by using solid-state switching circuitry. In one such method, a solid-state relay is activated using a switching signal generated by a microcom ...

Application use of critical angle to measure permittivity a

Application: Use of critical angle to measure permittivity. A plane electromagnetic wave is incident on the surface of a dielectric at 36° from within the dielectric, at the interface between the dielectric and free spac ...

Noise constitutes a pure stochastic signal and is therefore

Noise constitutes a pure stochastic signal and is therefore "totally non-periodic" (a) Examine the amplitude and phase spectra of noise. Is the spectrum continuous? Do amplitude and phase spectra display stochastic behav ...

Outline the production process of a typical ic chip suppose

Outline the production process of a typical IC chip. Suppose a digital control circuit is assembled using discrete elements such as bipolar junction transistors, diodes, capacitors, and resistors, instead of their monoli ...

Radiation resistance an antenna is connected to the source

Radiation resistance. An antenna is connected to the source with a 50 Ω transmission line. The antenna radiates in free space. Calculate the standing wave ratio on the transmission line if: (a) The antenna is a half-wave ...

Application parameters of coaxial line the rg-l1u coaxial

Application: Parameters of coaxial line. The RG-l1/U coaxial line has the following properties: Z 0 = 75 Ω and v p = 2c/3 m/s. Assuming the line to be lossless, calculate its inductance and capacitance per unit length.

Prepare a two-page report on why you selected engineering

Prepare a two-page report on why you selected engineering, what discipline you wish to enter, the possible career paths you might follow, and why. Create the first page using a word processor. Create the second page usin ...

Develop a list of your skills and abilities determine which

Develop a list of your skills and abilities. Determine which could be improved with work experience and which will be developed in the classroom.

The delivered equipment cost for a fixed-bed carbon

The delivered equipment cost for a fixed-bed carbon adsorption system with a capacity of 5000 acfm was $100,000 in 1994. Estimate the installed cost of a similar system with a capacity of 7500 acfm in 2000.

As an engineering expert on a state planning board you have

As an engineering expert on a state planning board, you have to decide which traffic safety projects (involving installation of traffic lights, road-widening, etc.) should be funded by the state. Previously these matters ...

  • 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

A cola-dispensing machine is set to dispense 9 ounces of

A cola-dispensing machine is set to dispense 9 ounces of cola per cup, with a standard deviation of 1.0 ounce. The manuf

What is marketingbullwhat is marketing think back to your

What is Marketing? • "What is marketing"? Think back to your impressions before you started this class versus how you

Question -your client david smith runs a small it

QUESTION - Your client, David Smith runs a small IT consulting business specialising in computer software and techno

Inspection of a random sample of 22 aircraft showed that 15

Inspection of a random sample of 22 aircraft showed that 15 needed repairs to fix a wiring problem that might compromise

Effective hrmquestionhow can an effective hrm system help

Effective HRM Question How can an effective HRM system help facilitate the achievement of an organization's strate