Questions tagged [modeling]
Use this tag for questions about numerical or analytical modeling and simulation of engineered systems.
187
questions
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2answers
75 views
Are these section views correct Autodesk inventor
So I used AutoDesk inventor and created this machine part for the purpose of exercise , But it is preferred to not to hatch ribs in my course so is there a way to make it look like image (5 and 6) ?
...
1
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1answer
58 views
Autodesk inventor create rib feature failed
It's been kind of painful to create a rib I'm new to inventor while I was trying to create a rib symmetric about the YZ Plane this error keeps popping up
0
votes
1answer
36 views
How to draw hidden rib in Autodesk Inventor
I drew the outer hollowed body and the cylinder on 2 separate parts but I can't figure out how to draw this rib so that it is passes through the centre of the cylinder, a video of a similar example ...
1
vote
0answers
18 views
Tranfer function of non-self regulating process
This system is non-self regulating process with mathematical model :
dh/dt = (fi-fo)/C
where
fi = flow input,
fo = flow output,
C = tank capacity or volume tank.
I want make tranfer function of this ...
-1
votes
2answers
58 views
Mathematical model of an hydraulic jack
How to find a mathematical model of this hydraulic jack system?
I'm confused about the part when the piston extender, check valve 1 opens and check valve 2 closes, then liquid from the bottom tank ...
1
vote
2answers
48 views
How does one deal with indeterminacy in modeling the motion of vehicles with multiple wheels? (Dynamics Question)
Consider a vehicle with four wheels and suspension (coil and dampers) rolling over an arbitrary surface. What would be the magnitude (not direction) of the normal force on each wheel? Is there a ...
-1
votes
2answers
53 views
I’m having trouble converting this orthogonal shape to isometric, I’m only a beginner and would really appreciate some help [closed]
Orthogonal to isometric shape, I need help with this as I’m only a beginner, please help me.
1
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0answers
34 views
Sliding-mode control is a model-based technique?
The sliding mode control can be considered a model-based control? In my opinion yes since takes the information of the mathematical model of the system to be controlled handling with possible ...
0
votes
1answer
27 views
Workbench: Explain the difference between the case with bonded contact and the case with the frictional coefficient of 0.01
Explain the difference between the case 1 with bonded contact (top image) and the case 2 (bottom image) with the frictional coefficient of 0.01
For both cases, the top plate has displacement and the ...
0
votes
1answer
35 views
Solidworks - how to make a groove on a double curvature surface
Today, as I was making -for another post - the following part
Although, I managed to use a couple of ways to do the above (revolve a sketch, and b) using swept cut) I wondered how would I make ...
0
votes
1answer
40 views
Unstable System. Error Trying to model the Red Bull Stratosphere Free Fall
I tried to model a problem months ago and still I can't solve, I don't want forget this problem so I would like to share what I tried and if you know what is happening with my graph.
This is the ...
0
votes
0answers
36 views
Examples of model-based control techniques
I am trying to find out the differences between the model-based control approach and the data-driven one.
Surely the main difference is the latter's independence from the information of the ...
0
votes
1answer
39 views
Nominal model and Mathematical model of a real plant [closed]
What is the difference between nominal model and mathematical model of a real plant?
I am interested in understanding the difference since I want to understand why in some cases is not the best idea ...
1
vote
1answer
28 views
a model of a solid using trusses to approximate internal stresses?
my question is as follows: could the stresses on a solid body be aproximated with a discrete model based on trusses?, this is, that the result yielded by the analysis of the truss structure will ...
3
votes
1answer
84 views
Modelling of Ball and Beam System
I'm trying to model a basic ball and beam system using Euler-Lagrange Equation. My system looks something like this
I have come up with this final Euler-Lagrange Equation:
Where JB is the ball's ...
1
vote
1answer
28 views
Linear Nastran model not converging
I am running a SOL 101 linear statics FEA. If I fix down the whole geometry it converges. But anything less than around 90% fix down and it will sit there crunching away at the numbers forever. This ...
1
vote
1answer
70 views
Dynamic model of a two-mass electric drive taking into account the Gear Ratio
Two-mass rotational system has the following form and is represented in following structural diagram.
where $\tau_e$, $\omega_1$ and $J_m$ - motor torque, angular velocity and moment of inertia
$\...
2
votes
1answer
81 views
How to design an enclosure around the load cell (Beam type)?
Hardware and Electronics Used: Arduino UNO, HX711 ADC Load cell amplifier, Load Cell (2Kg);
Currently, I am working on a project which requires me to put load cell along with the other circuitry in an ...
0
votes
1answer
88 views
Modeling torque as surface pressure
Consider a rod with a length of 150 [mm] and a diameter of 44 [mm]. At the left boundary the rod is fixed to a wall. At the right end a torque of 1000 [N m] is applied. The remaining boundaries are ...
0
votes
1answer
45 views
transfer function with constants
I have the following differential equation and I need to obtain the transfer function of Z / P but there are constants so I cannot factor to obtain the relationship, how could I obtain the transfer ...
0
votes
0answers
26 views
propeller air mass flow equation
I am trying to model a hovercraft and I need to obtain an air inlet flow ratio in (kg / s) of a propeller based on its dimensions (it can be the radius) and speed, is there an equation like that? ...
0
votes
2answers
87 views
How do I read this schematic drawing notation for a drill hole?
It's for an NX part. I can't figure out the depths and such. I just know the placement of the 4 holes and that the diameters are 10 mm each.
0
votes
0answers
32 views
Find orientation of reference nodes in Abaqus
I am constructing a simplified model of a pontoon-supported floating bridge in Abaqus. I have chosen to represent the pontoons as one-noded user-elements defined from the mass and stiffness matrix for ...
2
votes
2answers
84 views
When can the thermal and mechanical energies of a fluid control volume be considered separately?
For a fixed control volume of a fluid, the conservation of energy equation is typically written as something like
$$\dot{Q} - \dot{W} = \frac{\text{d}}{\text{d}t}\iiint_{CV} \left( \hat{u} + \frac12 V^...
0
votes
0answers
32 views
Are there examples of spring-mass-damper system that exhibit increasing growth in an unstable way
Simply, are there examples of spring-mass-damper systems that exhibit unbounded behavior or at least increasing behavior for a period of time. I am trying to do some vibrations research, but I am ...
2
votes
0answers
18 views
How are circular dependencies dealt with inside MBSE?
How are circular dependencies (best) managed inside of MBSE environments? Let's say I have two properties that are linked to each other / they are linked to properties that affect each other.
How is ...
0
votes
0answers
17 views
What is the order of execution in system models?
I'm learning SysML/MBSE right now. In what order is a model "executed", that is: in what order are dependencies between properties reconciled?
For instance, if I have one component/subsystem ...
0
votes
1answer
58 views
How to model this real-world system to define transfer function for stability?
The system shown is an off-axis drive system that rotates the platform to 60° via a substantially-sized NEMA 34 stepper motor. The axial force required by the stepper/ballscrew assembly has already ...
0
votes
0answers
30 views
Magnetomotive forces acting on assembly
Apologies if this is the wrong place to pose this question, or if it is poorly formulated, I would appreciate any help, even if that is pointing me to a place where I can learn more about solving ...
0
votes
0answers
39 views
Optimal control of the gradient type PDE
I recently encountered the following optimal control problem.
The purpose of the system is to find the parameter $x$ at which the maximum or minimum of the function $f$ a is reached. $x$ is unknown to ...
1
vote
2answers
62 views
Trouble with an actuator on a Robotics SolidWorks design. Any ideas why?
I am in the process of developing a robotics design on SolidWorks.
The goal of this design is to tilt a platform using 2 actuators.
My design utilizes 2 indirect actuators that are separately powered ...
3
votes
0answers
28 views
Is there any formula to model the effective Young's Modulus of a fluid-filled spherical shell?
I am creating composites of a host epoxy and filler particles which are thin-walled fluid-filled shells. Using the Halpin-Tsai equations, for example, I can predict the bulk composite Young's modulus ...
1
vote
1answer
22 views
Thermal Capacitance - Convention for Modeling of Electrical Equivalent
As an EE, I am very comfortable with the mapping of thermal quantities to their electrical equivalents. However, understanding how thermal capacitances should be connected is driving me crazy.
this ...
2
votes
1answer
29 views
differential drive vehicle in screen coords
differential drive vehicle in world frame
what would change in the kinematic model of the differential drive vehicle if i wanted to simulate it
using pygame module in python ( pygame or opencv or any ...
3
votes
0answers
30 views
Problem in the inverse kinematic model of a car like vehicle?
I'm a electrical engineering student and i am building a simulation of a car like vehicle .
As I understand it:
The input for the forward kinematic model are the control
variables and the output is ...
0
votes
0answers
32 views
Are gas distribution networks tree-like?
I was wondering, if it is justified to say, that gas distribution network graphs (primarily in Europe) are typically tree-like. By gas distribution networks I mean municipal and regional distribution ...
-1
votes
1answer
97 views
Deriving equation of motion of a 1 degree of freedom system
Before solving this system, note that the rigid bars $\mathrm{\overline{OA}}$ and $\mathrm{\overline{OB}}$ are rotating about point $\mathrm{O}$, not their respective CGs. To account for this two ...
4
votes
0answers
178 views
Solidworks Loft error (guide curve not intersecting with profiles)
I am trying to add 'finger grooves' to my model of a brake lever and want to use a loft to do so. I have created (to my knowledge) all required sketches for the loft but SW gives me an error when ...
1
vote
1answer
51 views
Autodesk Inventor Make Holes on Different Edges Based on One Line
I need to invent a construction based on standard square tubes with holes placed in certain distance from each other and from ends of the tubes:
I also need to imagine the tube with holes as a ...
2
votes
0answers
23 views
Setup Invention Process in Engineering CAD Software
I need to develop a collapsible metal construction. I have a few specific prerequisites. Generally speaking, it will be something like a big construction toy, but not be a toy. It has the specific ...
2
votes
2answers
35 views
Force Transmission in Flexible Tools such as this tool
In general, I want understand how the Power transmission in flexible tools works such as this flexible pick up tool in this link: https://www.youtube.com/watch?v=TLbCatz4Pnkv=q9AkmsTNLkY . ...
1
vote
0answers
39 views
Superimposing a Vector Field onto a Toroid in Matlab
I am a systems and control PhD student in Aerospace Engineering. Currently, I am trying to create a wind shear model of a toroidal thermal "bubble" in Matlab similar to the one in this paper (shown ...
0
votes
1answer
181 views
Pspice ac sweep problem
I want to run an AC sweep from 1 Hz - 10 MHz and calculate the output of the circuit (the voltage on RL), however spice shows that my voltage is 0 in a lot of parts that it shouldn't. I believe the ...
1
vote
1answer
57 views
Help understanding this dimension sheet
I am trying to currently model a few parts for my custom 3D Printer. I have found some flanged lead screw nuts i'm going to use, but i'm having a hard time reading the dimension sheet. Specifically, ...
0
votes
1answer
74 views
Calculate forces/ torques on a parallel spring array
I am stuck on the calculation of forces on a certain system involving parallel springs.
The schematic of the system is as follows:
The lower plane is fixed and the upper plane movable. There is a ...
2
votes
1answer
170 views
linearizing a non linear state space equation
I have this 1-DOF helicopter simulator.
The motor's armature resistance is $R$, inductance $L$ and motor constant $K$ and reaction torque on the motor shaft is $τ$. $T$ is equal to $k_1w_2^2$ and $...
0
votes
0answers
57 views
Lagrangian of a piezoelectric material
I'm confused about the Lagrangian of a piezoelectric material. I've seen multiple sources which seem to contradict each other.
The way I personally approach the problem is the following ($\underline{...
2
votes
1answer
66 views
Modeling the torque of a real motor
I am trying to control a real inverted pendulum by means of a DC motor, for this I must model the torque of the motor, the work I've done in this direction is the following (which I believe is right):
...
2
votes
0answers
16 views
Increase in target emission rate (TER) when using a air source heat pump (ASHP) in standard assessment procedure (SAP) calculation
I am running a SAP calculation on a proposed building which will be utilising a 8.5 kW ASHP for space and water heating. I am also running a comparative analysis against a mains gas boiler to show the ...
2
votes
0answers
23 views
How does one calculate the principial component stresses in an ellipsoidal tank due to head pressure?
I have parameterized the following common bulkhead tank, which has cylindrical walls (easy enough) and ellipsoidal bulkheads. The upper tank is full of a fluid of density 800 kg/m^3 and the lower is ...
