AEE 4263 HW 10
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AEE 4263-02 Space Flight Mechanics Homework
HW10
Fall 2023
1.
(15 points) A spacecraft has the following inertia tensor:
I
=
[
500
−
8
−
7
−
8
300
−
5
−
7
−
5
400
]
kg
−
m
2
a.
(5 points) What are the minimum, intermediate, and maximum principal moments of inertia to the nearest kg
−
m
2
?
b.
(10 points) What is the transformation matrix from body to principal coordinates (i.e.,
C
b
p
) to four decimal places?
Solution:
a.
Minimum MOI= 501
kg
−
m
2
Intermediate MOI= 400
kg
−
m
2
Maximum MOI= 299
kg
−
m
2
b.
C
b
p
= -0.9970 -0.0416 -0.0652
0.0380 -0.9978 0.0551
0.0674 -0.0525 -0.9963
MATLAB:
%% Homework 10 Problem 1
close all clear all
clc
I= [500 -8 -7; -8 300 -5; -7 -5 400] %kg-m^2
[eigenVectors, eigenValues] = eig(I)
I_pricipal= [-eigenVectors(:,3), eigenVectors(:,1), eigenVectors(:,2)]
I_pricipal'*I*I_pricipal;
MOI= diag(eigenValues)
1
2.
(15 points) A spacecraft is spinning about the z-axis of its principal frame at 2
π rad
/
s
. The principal moments of inertia about the center of mass are:
I
xx
=
370
kg
−
m
2
I
yy
=
420
kg
−
m
2
I
zz
=
530
kg
−
m
2
The nutation damper has the following properties:
R
=
1
m μ
=
0.01
m
=
10
kg k
=
10000
N
/
m c
=
150
N
−
s
m
Use the Routh Hurwitz stability criteria to assess the spacecraft’s stability as a:
a.
(7 points) major axis spinner
b.
(7 points) minor axis spinner
c.
(1 point) why do you not need to evaluate the intermediate axis?
Solution:
a.
Major axis = Stable
r1_maj =1538460
r2_maj =23859450
r3_maj =1588940954.55
r4_maj =134666.21
r5_maj =7361318631.66
b.
Minor axis = Unstable
r1_min =2203740
r2_min =34177050
r3_min =2276680293.88
r4_min =-149591.50
r5_min =2970492893.22
c.
Intermediate axis: Did not need to evaluate because motion is not stable by there being different signs on the r’s. Spin is unstable about the intermediate axis.
r1_int =1941390
r2_int =29964450
r3_int =1996576766.15
r4_int =-231592.44
r5_int =-2584430101.53
MATLAB:
%% Homework 10 Problem 2
close all clear all
clc
R= 1; %m
mu= 0.01; m= 10; %kg
k= 10000; %N/m
c= 150; %N-s/m
w0= 2*pi;
% Major
2
Ixx_maj= 370; %kg-m^2
Iyy_maj= 420; %kg-m^2
Izz_maj= 530; %kg-m^2
MOI_maj= [Ixx_maj Iyy_maj Izz_maj];
a4_maj= (1-mu)*m*Ixx_maj*Iyy_maj;
a3_maj= c*Ixx_maj*(Iyy_maj+ (1-mu)*m*R^2);
a2_maj= k*(Iyy_maj+(1-mu)*m*R^2)*Ixx_maj + (1-mu)*m*((Ixx_maj-
Izz_maj)*(Iyy_maj-Izz_maj)-(1-mu)*Ixx_maj*m*R^2)*w0^2;
a1_maj= c*((Ixx_maj-Izz_maj-(1-mu)*m*R^2)*(Iyy_maj-Izz_maj))*w0^2;
a0_maj= k*((Ixx_maj-Izz_maj-(1-mu)*m*R^2)*(Iyy_maj-Izz_maj))*w0^2 + ((Iyy_maj-Izz_maj)*(1-mu)^2)*m^2*R^2*w0^4;
r1_maj= a4_maj
r2_maj= a3_maj
r3_maj= a2_maj-((a4_maj*a1_maj)/a3_maj)
r4_maj= a1_maj- (a3_maj^2 *a0_maj)/((a3_maj*a2_maj) - (a4_maj*a1_maj))
r5_maj=a0_maj
% Minor Ixx_min= 530; %kg-m^2
Iyy_min= 420; %kg-m^2
Izz_min= 370; %kg-m^2
MOI_min= [Ixx_min Iyy_min Izz_min];
a4_min= (1-mu)*m*Ixx_min*Iyy_min;
a3_min= c*Ixx_min*(Iyy_min+ (1-mu)*m*R^2);
a2_min= k*(Iyy_min+(1-mu)*m*R^2)*Ixx_min + (1-mu)*m*((Ixx_min-
Izz_min)*(Iyy_min-Izz_min)-(1-mu)*Ixx_min*m*R^2)*w0^2;
a1_min= c*((Ixx_min-Izz_min-(1-mu)*m*R^2)*(Iyy_min-Izz_min))*w0^2;
a0_min= k*((Ixx_min-Izz_min-(1-mu)*m*R^2)*(Iyy_min-Izz_min))*w0^2 + ((Iyy_min-Izz_min)*(1-mu)^2)*m^2*R^2*w0^4;
r1_min= a4_min
r2_min= a3_min
r3_min= a2_min-((a4_min*a1_min)/a3_min)
r4_min= a1_min- (a3_min^2 *a0_min)/((a3_min*a2_min) - (a4_min*a1_min))
r5_min=a0_min
% Intermediate
Ixx_int= 370; %kg-m^2
Iyy_int= 530; %kg-m^2
Izz_int= 420; %kg-m^2
MOI_int= [Ixx_int Iyy_int Izz_int];
a4_int= (1-mu)*m*Ixx_int*Iyy_int;
a3_int= c*Ixx_int*(Iyy_int+ (1-mu)*m*R^2);
a2_int= k*(Iyy_int+(1-mu)*m*R^2)*Ixx_int + (1-mu)*m*((Ixx_int-
Izz_int)*(Iyy_int-Izz_int)-(1-mu)*Ixx_int*m*R^2)*w0^2;
a1_int= c*((Ixx_int-Izz_int-(1-mu)*m*R^2)*(Iyy_int-Izz_int))*w0^2;
a0_int= k*((Ixx_int-Izz_int-(1-mu)*m*R^2)*(Iyy_int-Izz_int))*w0^2 + ((Iyy_int-Izz_int)*(1-mu)^2)*m^2*R^2*w0^4;
3
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5. Two cables are tied to the 2.0 kg ball shown below. The ball revolves in a horizontal
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- Edition Eighth Z▼▲ Ā Mc Graw Hill Vector Mechanics for Engineers: Statics HW: Ch 6 จงหาตำแหน่งของจุดศูนย์ถ่วงของชิ้นส่วนเครื่องจักรกลด้านแกน x ของวัสดุประกอบดังรูป Find the position of the center of gravity of the mechanical part on the x-axis side of the composite as shown in the figure. mm 20 34 mm 62 mm 51 mm 20 mm 200 mm 10 mm © 2007 The McGraw-Hill Companies, Inc. All rights reserved. 45 m 100 mm 55 mm 7-52arrow_forwardA mechanic changing a tire rolls a wheel along the ground towards the car. The radius of the wheel is 42cm, and the speed of the wheel as it rolls is 2 revolutions per second. Height Above Ground (m) radiu HIDE wheel spet Time The diagram above illustrates the vertical motion of a point on the tire over time. It is possible to model the height of this point using a sinusoidal function of the form h(t)=-a sin[b(t-c)]+d. a) Determine the length of time required for one revolution of the tire. b) State the numerical value for each of the parameters a, b, c & d. And write a function representing the motion of the point in the form h(t)= -a sin[b(t−c)]+d.arrow_forwardSaved em Set 02 - Chapter 2 Part 1 Required information of 2 Consider the following vectorial representations. Add the three vectors shown to form a resultant vector R , and report your result using polar vector representation. Take Y= 3 m. 2 m ok 3 m 30° 162 2 (Enter a positive value for the phase angle.) 4.84 m @ cesarrow_forward
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- For the Following question Graph all 4 : [I just need all 4 graphs and please explain and make clean solution] Position vs time Velocity vs time Acceleration vs time Force vs time [For your convenience, I have solved the numerical solutions for the problem] (Please Look at the picture since it is much cleaner) Question : A 550 kilogram mass initially at rest acted upon by a force of F(t) = 50et Newtons. What are the acceleration, speed, and displacement of the mass at t = 4 second ? a =(50 e^t)/(550 ) [N/kg] v = ∫_0^t▒(50 e^t )dt/(550 )= v_0 +(50 e^t-50)/550=((e^t- 1))/11 x = ∫_0^t▒(e^t- 1)dt/(11 )= x_0 +(e^t- t - 1)/(11 ) a(4s)=(50*54.6)/550= 4.96[m/s^2 ] v(4s)=((e^4-1))/11= 4.87[m/s] x(4s)=((e^4- 4 - 1))/11= 4.51 [m]arrow_forwardm and n are orthogonal vectors. Let their component forms be defined as (mx, my) and (nx, ny) respectively, where all values are integers. mx+nx=-3 and nymy=40. If Oarrow_forwardWhich of the following dimensions belongs in the set (force, velocity, acceleration, magnetic field}? * mass speed displacement temperature When two vectors are perpendicular, their * dot product is zero cross product is zero. both are zero both are not necessarily zero The cross product of tWO vectors 3İ + 4j -5k and-i+j- 2k isarrow_forwardA docs.google.com In circular motion vr=0 vr=v theta vr=-v theta ar=0 The right representation of r-theta ***I' coordinates is --- a b. d a O b According to the figure, the vector 25 points equation isarrow_forward10. [-/3 Points] DETAILS SERCP8 4.P.012. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Two forces are applied to a car in an effort to move it, as shown in the following figure, where F, = 427 N and F, = 381 N. (Assume up and to the right as positive directions.) 10° 180° F (a) What is the resultant of these two forces? magnitude N direction ° to the right of the forward direction (b) If the car has a mass of 3,000 kg, what acceleration does it have? Ignore friction. m/s2 Need Help? Read Itarrow_forwardCan you answer quickly 9)Let A axis team consist of XA, YA and ZA vectors, and B axis team consists of vectors XB, YB and ZB. Let the expression of the origin of the A axis set on the B axis set be denoted by BPAORG. Let BVA denote the representation of the vector VA on the B axis set. Let it be defined as BAR = [BXA BYA BZA]. BAR BPAORG0 0 0 1 Let the 4x4 matrix given as BAT. So what is the result of BAT ACT CBT matrix multiplication? Matrix whose diagonal elements are zero and whose other elements are aZero matrixMatrix whose all elements are oneIdentity matrixarrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
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