Developing simulations for the Missile Defense Agency - Advanced Technology group

30+ years experience in missiles, smart munitions and other aerodynamic systems. Specializing in systems engineering, aerospace systems design, simulation and modeling, aerodynamics, and numerical analysis.

Answered

Implement friction into a model, related to the velocity. (Missile Launch)

This question is familiar. look here.

Implement friction into a model, related to the velocity. (Missile Launch)

This question is familiar. look here.

environ 9 heures ago | 0

Answered

How to make a marker circle bold?

plot(x, y, 'ro', 'linewidth',2);

How to make a marker circle bold?

plot(x, y, 'ro', 'linewidth',2);

1 jour ago | 0

| accepted

Answered

how can i resolve this equation Runge kutta method

Ths is the equation for a parabola. y'' = -1 y' = -y y = -1/2 y^2 No need for a numerical approximation.

how can i resolve this equation Runge kutta method

Ths is the equation for a parabola. y'' = -1 y' = -y y = -1/2 y^2 No need for a numerical approximation.

4 jours ago | 0

Answered

Missile Lauch friction gamma factor - Output deviating from desired output, please help!

Step 1: Draw a free body diagram that shows the body with all of the forces that act on it and the coordinate frame(s) that are...

Missile Lauch friction gamma factor - Output deviating from desired output, please help!

Step 1: Draw a free body diagram that shows the body with all of the forces that act on it and the coordinate frame(s) that are...

6 jours ago | 0

| accepted

Answered

How to calculate the slope from geopraphical coordinates?

First of all, you should consider the relationship between the WGS84 lat/lon/alt and the ECEF frame. Altitude is perpendicular ...

How to calculate the slope from geopraphical coordinates?

First of all, you should consider the relationship between the WGS84 lat/lon/alt and the ECEF frame. Altitude is perpendicular ...

7 jours ago | 1

Answered

calculate rotation matrix in 3D

I'll assume that we make the reference frame right-handed by negating the axis_3 vector such that axis_1 = [2.7239 -0.2014 -...

calculate rotation matrix in 3D

I'll assume that we make the reference frame right-handed by negating the axis_3 vector such that axis_1 = [2.7239 -0.2014 -...

17 jours ago | 1

| accepted

Answered

Translational motion of a rotating object.

To begin, Chasles' theorem states that translational motion and rotational motion obey the law of superposition. Therefore, you...

Translational motion of a rotating object.

To begin, Chasles' theorem states that translational motion and rotational motion obey the law of superposition. Therefore, you...

25 jours ago | 0

Answered

change variable value based on other variable in if loop

Your input command is requesting a string input: in1 = input('first: ','s'); in2 = input('second: ','s'); This results in in1...

change variable value based on other variable in if loop

Your input command is requesting a string input: in1 = input('first: ','s'); in2 = input('second: ','s'); This results in in1...

25 jours ago | 1

| accepted

Answered

I don't know the problem involved Backward difference.

I am assuming that your question is that you don't understand Simpson's rule. Below is an exerpt from Wikipedia: Simoson'...

I don't know the problem involved Backward difference.

I am assuming that your question is that you don't understand Simpson's rule. Below is an exerpt from Wikipedia: Simoson'...

environ un mois ago | 0

| accepted

Answered

1-2-1 or X-Y-X rotation matrix not supported

I recently cataloged all of the permutations of the 2 and 3 axis planar rotations. It is easy to write your own functions. See...

1-2-1 or X-Y-X rotation matrix not supported

I recently cataloged all of the permutations of the 2 and 3 axis planar rotations. It is easy to write your own functions. See...

environ un mois ago | 0

Answered

Extracting data from simout MATLAB work space

simout is a timeseries structure. I like to extract separate vectors from the structure, for example: t = timout.time(simout.t...

Extracting data from simout MATLAB work space

simout is a timeseries structure. I like to extract separate vectors from the structure, for example: t = timout.time(simout.t...

environ un mois ago | 0

Answered

Where can I publish Matlab-compiled software?

If you want to share the source code, you can post it on Matlab File Exchange

Where can I publish Matlab-compiled software?

If you want to share the source code, you can post it on Matlab File Exchange

environ un mois ago | 0

| accepted

Answered

In my Simulink model I would like to conditionally write output data to selectable .mat files in different relative directories.

This sounds like a rather sophisticated way of constructing output. I'm not sure if that is easily acomplished with the "to fil...

In my Simulink model I would like to conditionally write output data to selectable .mat files in different relative directories.

This sounds like a rather sophisticated way of constructing output. I'm not sure if that is easily acomplished with the "to fil...

environ un mois ago | 0

| accepted

Answered

minimum feret diameter of particle

https://blogs.mathworks.com/steve/2018/02/20/minimum-feret-diameter/?s_tid=answers_rc2-1_p4_MLT

minimum feret diameter of particle

https://blogs.mathworks.com/steve/2018/02/20/minimum-feret-diameter/?s_tid=answers_rc2-1_p4_MLT

environ un mois ago | 0

Answered

Vlookup equivalent function for matlab

If your data is in a 2D table (matrix) and you want to locate a column that matches the exact value from another column, then lo...

Vlookup equivalent function for matlab

If your data is in a 2D table (matrix) and you want to locate a column that matches the exact value from another column, then lo...

environ un mois ago | 0

| accepted

Answered

How calculate the second and third numerical derivative of one variable f(x)

The Matlab "diff" function is basically the Backward difference formula. There are much more accurate ways to compute numerical...

How calculate the second and third numerical derivative of one variable f(x)

The Matlab "diff" function is basically the Backward difference formula. There are much more accurate ways to compute numerical...

environ un mois ago | 0

Answered

Runge kutta order 2 by hand

In the statement Y(1) = [t(1);y(1)] the simi-colon ";" indicates you are attempting to put 2 rows of numbers into a single ro...

Runge kutta order 2 by hand

In the statement Y(1) = [t(1);y(1)] the simi-colon ";" indicates you are attempting to put 2 rows of numbers into a single ro...

environ un mois ago | 0

Answered

Correct way to detect Zero crossing

A thought you might want to consider: if you multiply the current value, y(i) by the previous value y(i-1), this product is on...

Correct way to detect Zero crossing

A thought you might want to consider: if you multiply the current value, y(i) by the previous value y(i-1), this product is on...

environ 2 mois ago | 1

Answered

How to add optional outport to simulink model?

You can use a switch to select between the two different output options that you want, and there are a number of ways to activat...

How to add optional outport to simulink model?

You can use a switch to select between the two different output options that you want, and there are a number of ways to activat...

environ 2 mois ago | 0

| accepted

Answered

Ralston's method function

There is an error in your function in the k2 term. For Ralstons method, it should be: k1 = h*f(t(i), y(i)); k2 = h*( f( t(i) ...

Ralston's method function

There is an error in your function in the k2 term. For Ralstons method, it should be: k1 = h*f(t(i), y(i)); k2 = h*( f( t(i) ...

environ 2 mois ago | 0

Answered

First and Second Order Central Difference

For starters, the formula given for the first derivative is the FORWARD difference formula, not a CENTRAL difference. (here, ...

First and Second Order Central Difference

For starters, the formula given for the first derivative is the FORWARD difference formula, not a CENTRAL difference. (here, ...

environ 2 mois ago | 0

| accepted

Answered

How can I integral Acceleration-time data to Velocity with removing drift?

It seems that what you are asking cannot be done. More information is needed. In order to remove an error in the data, you nee...

How can I integral Acceleration-time data to Velocity with removing drift?

It seems that what you are asking cannot be done. More information is needed. In order to remove an error in the data, you nee...

environ 2 mois ago | 1

Answered

Unit step function explanation

Double is simply the data type , i.e. double precision. (T>=0) is a logical 0 or 1. double converts the answer to double preci...

Unit step function explanation

Double is simply the data type , i.e. double precision. (T>=0) is a logical 0 or 1. double converts the answer to double preci...

environ 2 mois ago | 1

| accepted

Answered

Solving Linear System of Equations with a Real Parameter

Using the symbolic toolbox, you can solve it as follows: 1) Define symbolic quantities; syms A B x1 x2 x3 x4 lamda 2) Write t...

Solving Linear System of Equations with a Real Parameter

Using the symbolic toolbox, you can solve it as follows: 1) Define symbolic quantities; syms A B x1 x2 x3 x4 lamda 2) Write t...

environ 2 mois ago | 1

| accepted

Answered

Not sure why vector changes assignment when using ode45

I dont think that the statement out3=(3,1) is a valid statement. It may be that out3 is not the size that you intend. try o...

Not sure why vector changes assignment when using ode45

I dont think that the statement out3=(3,1) is a valid statement. It may be that out3 is not the size that you intend. try o...

environ 2 mois ago | 1

Answered

Why ,the quaternion values from sensor fusion toolbox are switched ?

There are two different ways that are commonly used to represent quaternions. Q = [a,b,c,d] with d being the scalar part, and a...

Why ,the quaternion values from sensor fusion toolbox are switched ?

There are two different ways that are commonly used to represent quaternions. Q = [a,b,c,d] with d being the scalar part, and a...

environ 2 mois ago | 0

Answered

Euler's method for two first order differential equations?

Try preallocating x and y nsteps = (b-a)/h + 1; % this is the number of elements in t(a:h:b) (It is = N+1) x=zeros(1,nsteps);...

Euler's method for two first order differential equations?

Try preallocating x and y nsteps = (b-a)/h + 1; % this is the number of elements in t(a:h:b) (It is = N+1) x=zeros(1,nsteps);...

environ 2 mois ago | 0

| accepted

Answered

How do i create a projectile?

Always start by making a drawing of the problem. Define the coordinate system (which way is positive/negative) What are the pa...

How do i create a projectile?

Always start by making a drawing of the problem. Define the coordinate system (which way is positive/negative) What are the pa...

2 mois ago | 0

Answered

Error - Undefined function or variable

Line 16: if epsc<=eps0 Variable epsc is not defined.

Error - Undefined function or variable

Line 16: if epsc<=eps0 Variable epsc is not defined.

2 mois ago | 0