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Mechanical Engineering
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Jul 3, 2024
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1
AVIA305
Sec D02
Brian Cortez
Annotated Bibliography
J. Domino, Z. Czyż and R. Bąbel, "Aerodynamic Load Measurements on the Example of Diamond DA42 Model Aircraft," 2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace), Milan, Italy, 2023, pp. 704-708, doi: 10.1109/MetroAeroSpace57412.2023.10189976.
This paper deals with the design, preparation and manufacture of a model aircraft for wind tunnel
testing. The project was based on the twin-engine aircraft, Diamond DA42. Based on technical drawings, a model of thie aircraft was made in a CAD environment and subsequently 3D printed using FDM technology. The dimensions of the model were adjusted to the size of the wind tunnel
measurement space. The model omitted aircraft structural elements such as propellers and landing gear. The entire model was then mounted on a 6-component force balance. For the final version of the model, wind tunnel tests were conducted. The work was supplemented with a description of the test stand and several tests were carried out. The test results provide useful insights into the aerodynamic design and characteristics of the aircraft.
Szczepaniak, R., Pożoga, Ł., Stabryn, S., & Stryczniewicz, W. (2016). FCFD analysis of the influence of winglets on the aerodynamic performance of the DA42 diamond aircraft.
Journal of KONES. Powertrain and Transport
,
23
(1), 361–368. https://doi.org/10.5604/12314005.1213551
This journal presents the application of CAE software for an investigation of the aerodynamic performance of a small two-engine aircraft, the DA42. In the study, Computational Fluid Dynamics was applied in order to determine the influence of winglets on the aerodynamic performance of the DA42 Diamond aircraft. The simulations were performed with the use of SolidWorks Flow Simulation software. In order to evaluate the influence of the winglets on the lift and drag force, two configurations of the selected aircraft were modelled: with and without
2
AVIA305
Sec D02
Brian Cortez
winglets. The results of the simulations confirmed a reduction of induced drag caused by wingtips vortices dissipation introduced by winglets. The maximum reduction of the induced drag was achieved at high angles of attack. This research is pivotal to a well structured argument on the reasoning for the design of the subject aircraft. Collins, P. (2019, October 9).
Flight test: Diamond Aircraft DA42 - sparkling performer
. Flight Global. https://www.flightglobal.com/flight-test-diamond-aircraft-da42-sparkling-
performer/55396.article
This article from flight global gives an overview on the key features of the Diamond DA42 that made it appealing to the masses when it first released. The article goes on to talk about the development, configuration, and operational ability of the DA42. It is particularly useful because
it was published at the time of release of the aircraft, giving it timely relevance. Diamond. (n.d.-a). Da 42 AFM 7.01.05-e revision 9. http://support.diamond-air.at/fileadmin/uploads/files/after_sales_support/
DA42_Twin_Star/Airplane_Flight_Manual/Basic_Manual/70105e-Rev9-complete.pdf
This is the 9
th
revision of the AFM for the Diamond DA42 NG. It contains everything from performance calculations, weight and balance, systems, operating procedures and limitations. It is a comprehensive overview into the inner workings of this aircraft and is an invaluable resource
in calculating aerodynamic performance metrics to add sustenance to my essay.
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Related Questions
Drop-load (I)This exercise is part of a series of problems aimed at modeling a situation by progressively refining our model to take into account more and more parameters. This progressive approach is very close to what professional scientists do!
context
We want to lower a suspended load in a controlled way, so that it hits the ground with a speed whose modulus is not too great. To do this, the suspended load (B) is connected by a rope passing through a pulley to another mass (A), which can move on a horizontal surface. To slow down the descent, we added a spring behind the mass (A).
Information
The masses of the charges A and B are known.The mass of the rope itself is negligible (very small compared to the loads).The pulley has negligible mass and can rotate without friction.The charge ? is initially stationary and is at a known height h.The surface on which mass A is placed is horizontal.There is no friction between mass A and the surface on which it is placed.The string attached…
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Wind tunnel test section
km/h
Model
FD
Moving belt Drag balance
The aerodynamic drag of a new Volvo FH truck is to be predicted at a speed of 85 km/h at an air
temperature of 25°C (p=1.184 kg/m³, u=1.849x10-5kg/m-s). Volvo engineers build a 1/2 scale
model of the FH to test in a wind tunnel. The temperature of the wind tunnel is also 25°C. The drag
force is measured with a drag balance, and the moving belt is used to simulate the moving ground.
Determine how fast the engineers should run the wind tunnel to achieve similarity between
the model and the prototype.
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Can you help with both please.
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3/104 The car is moving with a speed vo= 105 km/h up
the 6-percent grade, and the driver applies the
brakes at point A, causing all wheels to skid. The
coefficient of kinetic friction for the rain-slicked
bogne-road is = 0.60. Determine the stopping distance
ed ISAB. Repeat your calculations for the case when the
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According to Froude scaling laws, what should the revolutions per minute of the prototype propeller be under dynamically similar conditions? and
According to Froude scaling laws, what should the horsepower output of the prototype propeller be under dynamically similar conditions?
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Give a detailed solution in a handwritten format.
Don't use chatgpt.
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Question 5
a) A 1:20 scale model of a surface vessel is used to test the influence of a proposed design on
the wave drag. A wave drag of 6.2 lb is measured at a model speed of 8.0 ft/sec. What speed
does this correspond to on the prototype, and what wave drag is predicted for the prototype?
Neglect viscous effects, and assume the same fluid for model and prototype.
b) Discuss the modelling and types of similarities
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3. Problem
Estimate the frictional resistance Rp for a container ship using the ITTC 1957 model-ship correlation line
Equation (2):
0.075
CF
[ log,,(Re) – 21
The ship has the following particulars:
Full scale ship data
length between perpendiculars Lep
length in waterline
length over wetted surface
195.40 m
Lwz
Los
For the wetted surface S you can use the following
formula by Kristensen and Lützen (2012) derived
for container ships.
200.35 m
205.65 m
breadth
B
29.80 m
draft
T
10.10 m
37085.01 m3
S = 5 + Lw. T
0.995
displacement
design speed
Again, use the most up-to-date ITTC water properties sheet for density and kinematic viscosity.
V
21.00 kn
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What is the link between gust spectrum and force spectrum, and
what is the link between force spectrum and response
spectrum? Please give the related formulas.
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L.
y
X
VA
A
VB
PLANE OF CONTACT
BY
UBC Engineering
On an air hockey table, two pucks of identical mass collide in the middle of the rink. Puck A had an initial
m
velocity vA
1.9?
and puck B had an initial velocity vB = 3.2j
The plane of contact can be thought of as a line angled 0 = 34° above the x-axis. If the coefficient of
0.5 between the pucks, what are the velocities of the pucks after the impact?
||
m
according to the x-y axis shown.
restitution is e =
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>
| E9
docs.google.com/form
تبديل الحساب
Questions
7 نقاط
Q1/ The power of 6-blade flat blade turbine agitator in a tank is a function of diameter of impeller, number of
rotations of the impeller per unit time, viscosity and density of liquid. From a dimensional analysis, obtain a
relation between the power and the four variables.
3.
صفحة 2 من
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CASIO
fx-991ES PLUS
ALPHA
CALC
EGO
the car move ?
[Ans. NA 16.5 kN, Ng =42.3
kN, the car does not move]
%3D
5. A box weighs 150 kg. The coefficient of static friction
between the box and the ground is 0.3. Determine if the
80 kg man can pull the box without slipping when the
coefficient of static friction between the man's shoes and
the ground is 0.4.
Hint: analyse block and man separately i.e. draw separate FBDS
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The following equation may be used to estimate the take-off ground run for an aircraft: Equation has been attached as an image.
Calculate the take-off ground run, from a runway at ISA-SL conditions, for a twin engine aircraft for which the following data may be assumed
Aircraft lift-off speed
155 knots
Max take-off gross weight
220 tonnes
Wing planform area (S)
358 m
Wing CL (t/o flaps deployed, a = 0)
1.1
Wing span
53.18 m
Oswald efficiency factor, e
0.7
KGE = CD(IGE) / Co(OGE)
0.4
Co sum (fuselage, wing, tailplane and nacelle)
0.015
Co for undercarriage
0.021
Co for flaps at taking-off setting
0.0073
Coefficient of rolling friction, u
0.02
Engine thrust (assumed constant)
310 kN per engine
It may be assumed that 1knot = 0.51444 m/s
It may be assumed that 1knot = 0.51444 m/s
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Question 5
a) A 1:20 scale model of a surface vessel is used to test the influence of a proposed design on
the wave drag. A wave drag of 6.2 lb is measured at a model speed of 8.0 ft/sec. What speed
does this correspond to on the prototype, and what wave drag is predicted for the prototype?
Neglect viscous effects, and assume the same fluid for model and prototype.
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C, =-
pu'A
where A is the maximum cross-sectional area of the car in the flow. With the model car, a
force of 3 N was recorded at a flow velocity u of 6 m s. Assuming that flow conditions
are comparable (i.e., at the same Reynolds number), calculate the expected drag force for
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hour). [The density of air p= 1.2 kg m.]
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model of the parachute is tested in a wind tunnel. The wind tunnel temperature and
pressure are the same as those of the prototype, which is 70 °F and standard
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a) Calculate the drag coefficient of the prototype. (Hint: At terminal velocity,
speed is constant so weight is in equilibrium with aerodynamic drag.)
b) At what speed should the wind tunnel be run in order to achieve dynamic
similarity?
c) Find the aerodynamic drag force of the model parachute in the wind tunnel
in pounds.
Payload
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Please don't copy from internet or chegg
NEED DETAILED AND STEP BY STEP ANSWER
Short or incomplete answer = thumbs down
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Current Attempt in Progress
The spring of modulus k = 203 N/m is compressed a distance of 300 mm and suddenly released with the system at rest. Determine the
absolute velocities of both masses (positive if to the right, negative if to the left) when the spring is unstretched. Neglect friction.
k
2 kg
= 203 N/m
wwwwww
5.6 kg
Answers:
2kg mass,
v=
5.6kg mass,
v =
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m/s
m/s
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A model pump has an impeller diameter of 30 cm. During a manufacturer's test, this model achieved an efficiency of 80%. A prototype in the same family (geometrically similar) is 10 times larger
than this tested model. Under the same operating conditions dynamically similar to those in the model test, what most approximately will be the efficiency of the prototype pump?
O 74%
OOOO
O 64%
O 84%
O 94%
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i need the answer quickly
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Submit correct and complete solutions.
Provide step-by-step detailed explanations.
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While using the Buckingham pi theorem to obtain non-dimensional groups, the repeated variables are chosen to be density, length and velocity and the non-repeat variable is angualr velocity.
What is the non dimensional group that will be found in the form of :
Non dimensional group= angular velocity x density ______x length ______x velcoity ________
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!
Required information
The power P generated by a certain windmill design depends upon its diameter D, the air density p, the wind velocity V,
the rotation rate 2, and the number of blades n.
A model windmill, of diameter 50 cm, develops 2.7 kW at sea level when V= 40 m/s and when rotating at 4800 rev/min. What power
will be developed by a geometrically and dynamically similar prototype, of diameter 5 m, in winds of 10 m/s at 2000 m standard
altitude? At 2000 m altitude, p = 1.0067 kg/m3. At sea level, p= 1.2255 kg/m3.
The power developed is
]KW.
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Mechanical EngineeringFluid mechanics
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Give me right solution with clear calculations
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ai the first 3 are a part
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A model of a golf ball is to be studied to
determine the effects of the dimples. A
sphere 10 times larger in diameter than an
actual golf ball is used in the wind tunnel
study. What speed should be selected for
the model to simulate a prototype speed of
50 m/s?
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Fluid Mechanics Problem
Note: Fluids are assumed to be at 20oC.
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5.8 Calculate the drag coefficient and drag force on a cylindrical shape flag post of the
ship having diameter 60 mm and 3m long exposed to wind velocity of 10m/s. The
density and the kinematic viscosity of air are 1.2 kg/m and 1.6x 10m'/s respectively.
[Ans: 10.8 N]
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Related Questions
- Drop-load (I)This exercise is part of a series of problems aimed at modeling a situation by progressively refining our model to take into account more and more parameters. This progressive approach is very close to what professional scientists do! context We want to lower a suspended load in a controlled way, so that it hits the ground with a speed whose modulus is not too great. To do this, the suspended load (B) is connected by a rope passing through a pulley to another mass (A), which can move on a horizontal surface. To slow down the descent, we added a spring behind the mass (A). Information The masses of the charges A and B are known.The mass of the rope itself is negligible (very small compared to the loads).The pulley has negligible mass and can rotate without friction.The charge ? is initially stationary and is at a known height h.The surface on which mass A is placed is horizontal.There is no friction between mass A and the surface on which it is placed.The string attached…arrow_forwardWind tunnel test section km/h Model FD Moving belt Drag balance The aerodynamic drag of a new Volvo FH truck is to be predicted at a speed of 85 km/h at an air temperature of 25°C (p=1.184 kg/m³, u=1.849x10-5kg/m-s). Volvo engineers build a 1/2 scale model of the FH to test in a wind tunnel. The temperature of the wind tunnel is also 25°C. The drag force is measured with a drag balance, and the moving belt is used to simulate the moving ground. Determine how fast the engineers should run the wind tunnel to achieve similarity between the model and the prototype.arrow_forwardCan you help with both please.arrow_forward
- -Sear x dynamics systems questions 1[1 x Week 15-Mechanical (Tutorials x + | C:/Users/40332698/AppData/Local/Packages/microsoft windowscommunicationsapps_8wekyb3d8bbwe/LocalState/Files/SO/145/Attachments/dynamics%... Q - +3 Page view A Read aloud Add textDraw Highlight V Erase ate the 3/104 The car is moving with a speed vo= 105 km/h up the 6-percent grade, and the driver applies the brakes at point A, causing all wheels to skid. The coefficient of kinetic friction for the rain-slicked bogne-road is = 0.60. Determine the stopping distance ed ISAB. Repeat your calculations for the case when the booga car is moving downhill from B to A. the case -8.0 ai noilsi' SA noitisoq de JDT mot gainnige ge = $1 bacilyon A S → vo 6 search 10. $ R F T V 25 % 5 T G B O Ai O A 6 Y H N & 7 U J Fa ★ 8 M 1 K FO 100 9 prt sc F10 O L ) O home P ; B A end F12 { ? + insert } 1 To 6 9°C Cloudy DENG ^ 7arrow_forward\arrow_forwardAccording to Froude scaling laws, what should the revolutions per minute of the prototype propeller be under dynamically similar conditions? and According to Froude scaling laws, what should the horsepower output of the prototype propeller be under dynamically similar conditions?arrow_forward
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