stator | 😍🙏 | Web Framework library
kandi X-RAY | stator Summary
kandi X-RAY | stator Summary
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QUESTION
- Icing of the engine and the leading edges of the intake duct can occur during flight through clouds containing supercooled water droplets or during ground operation in freezing fog. Protection against ice formation may be required since icing of these regions can considerably restrict the airflow through the engine, causing a loss in performance and possible malfunction of the engine. Additionally, damage may result from ice breaking away and being ingested into the engine or hitting the acoustic material lining the intake duct. 147 2. An ice protection system must effectively prevent ice formation within the operational requirements of the particular aircraft. The system must be reliable, easy to maintain, present no excessive weight penalty and cause no serious loss in engine performance when in operation. 3. Analyses are carried out to determine whether ice protection is required and, if so, the heat input required to limit ice build up to acceptable levels. Fig. 13-1 illustrates the areas of a turbo-fan engine typically considered for ice protection. 4. There are two basic systems of ice protection; turbo-jet engines generally use a hot air supply (fig. 13-2), and turbo-propeller engines use electrical power or a combination of electrical power and hot Ice protection Fig. 13-1 Areas t picall considered for ice protection. Fig. 13- Hot air ice protection. 148 149 Ice protection air. Protection may be supplemented by the circulation of hot oil around the air intake as shown in fig. 13-3. The hot air system is generally used to prevent the formation of ice and is known as an anti- icing system. The electrical power system is used to break up ice that has formed on surfaces and is known as a de-icing system. HOT AIR SYSTEM 5. The hot air system provides surface heating of the engine and/or powerplant where ice is likely to form. The protection of rotor blades is rarely necessary, because any ice accretions are dispersed by centrifugal action. If stators are fitted upstream of the first rotating compressor stage these may require 149 Ice protection protection. If the nose cone rotates it may not need anti-icing if its shape, construction and rotational characteristics are such that likely icing is acceptable. 6. The hot air for the anti-icing system is usually taken from the high pressure compressor stages. It is ducted through pressure regulating valves, to the parts requiring anti-icing. Spent air from the nose cowl anti-icing system may be exhausted into the compressor intake or vented overboard.
How can I use regex to get 1. , 2. ... I tried using this but to no avail ^\d..*(?=\d.), it gives me everything
...ANSWER
Answered 2020-Aug-27 at 13:03QUESTION
I'm trying to investigate the Modelica example Modelica.Electrical.Machines.Examples.SynchronousInductionMachines.SMPM_VoltageSource
but I replaced the signalVoltage by an inverter and a PWM block signalPWM which is based on Modelica.Electrical.PowerConverters.DCDC.Control.SignalPWM. So instead of sine voltages I want to investigate PWM modulated voltages.
The problem is that the controller keeps increasing its output linearily because of the integrating part of the controller as it never reaches the reference value of the desired q-current. In addition it outputs strange values for voltageController.y[1] in the range of [24E3,...,150E3], which is probrably the problem.
Unfortunately I don't understand why the controller works fine with the sine voltages and doesnt with the PWM voltages.
Below is my main model:
...ANSWER
Answered 2019-Nov-06 at 09:41With a voltage of ±200V and a load of 120Nm its simply not possible to obtain the demanded currents.
In contrast to the original MSL example you use a sign torque with 120Nm as load.
If you use that in the original MSL example, you will notice that the machine
keeps accelerating and that the required voltage grows without bounds (plot e.g. smpm.plug_sp.pin[1].v to see that).
In your example the voltage is limited to 200V. The demanded currents of -53A and 84.6A are not obtained, but the machine still generates a torque of 127Nm, which lets the machine accelerate. With increasing speed the required voltages increase also for a certain torque / current demand - but in your example the actual voltage is limited. Therefore the set currents are never reached.
What you can consider:
- increase the available voltage
(but for the current setup you need unrealistic high values of several thousand volts) - demand lower currents
(You can setIdon 0 anyway, as you have a machine withLd=Lq, so onlyIqproduces torque andIdis used for field weakening) - make your current controllers aware of the voltage limit
(use e.g.Modelica.Blocks.Continuous.LimPIDfor that, which contains anti-windup already)
The problem lies in your PWM computation.
I rebuilt the example with the original SignalPWM block from the MSL and a VoltageToDutyCycle component.
In the screenshot below the simulation results of the new model with f=14kHz are compared with the MSL version with ideal voltage supply. The screenshot shows the controller output (like in your question) and Iq.
The results were computed with the package below. It contains
- a partial model for all common components and variables
- an example with PWM and inverter
- an example with ideal continuous voltage supply
Note that the hints from my original answer remain, if the maximum voltage is reached. The controllers are not aware of the voltage limit, which can lead to integrator windup problems.
QUESTION
Based on the example Modelica.Electrical.Machines.Examples.SynchronousInductionMachines.SMPM_VoltageSource, I am trying to use the inverter from Modelica.Electrical.PowerConverters.DCAC.MultiPhase2Level to feed the SMPM.
Unfortunately I get the error
Simulation model is not globally balanced, having 337 variables and 335 equations
but I can't figure out which two equations are missing.
What confuses me even more is that the model is balanced if I remove the signalPWM, inverter and the constantVoltage sources.
ANSWER
Answered 2019-Sep-12 at 09:22You vectorized the component componentsignalPWM, using m=3 instances. But only the first instance has its input connected.
Change the connection
QUESTION
I'm trying to figure out a good way to programmatically generate contours describing a 2D surface, from a 3D STEP model. Application is generating NC code for a laser-cutting program from a 3D model.
Note: it's easy enough to do this in a wide variety of CAD systems. I am writing software that needs to do it automatically.
For example, this (a STEP model):
Needs to become this (a vector file, like an SVG or a DXF):
Perhaps the most obvious way of tackling the problem is to parse the STEP model and run some kind of algorithm to detect planes and select the largest as the cut surface, then generate the contour. Not a simple task!
I've also considered using a pre-existing SDK to render the model using an orthographic camera, capture a high-res image, and then operating on it to generate the appropriate contours. This method would work, but it will be CPU-heavy, and its accuracy will be limited to the pixel resolution of the rendered image - not ideal.
This is perhaps a long shot, but does anyone have thoughts about this? Cheers!
...ANSWER
Answered 2019-Jul-07 at 03:22I would use a CAD library to load the STEP file (not a CAD API), look for the planar face with the higher number of edge curves in the face loop and transpose them on the XY plane. Afterward, finding 2D geometry min/max for centering etc. would be pretty easy.
Depending on the programming language you are using I would search for "CAD control" or "CAD component" on Google combining it with "STEP import".
QUESTION
I'm analyzing an induction motor, varying the frequency and absolute value of the stator current. Since the FEM-Tool only works with a current input, I need to vary the current over the frequency to obtain current-values of constant torque for each frequency.
To generate a mesh, I use 2 for-loops: The outer loop sets the current. The inner loop varies the frequency with said current, gets the machine's torque and finally, the matrices are appended adding the current stator-current, frequency and torque each in separate matrices. Plotted it looks like this: Example of the plot using the raw data For the plot I used smaller, more imprecise matrices and rather arbitrary values:
...ANSWER
Answered 2019-Apr-17 at 23:23Your data need to be in a meshgrid form, that is 2D:
QUESTION
I'm creating a web form using Flask and Flask-WTF. The form is dynamic, with the fields determined by the database. Some questions in the database specify a radio button field, while others specify a single word.
I need to require that the radio button fields have a selection. Using wtforms.validators.DataRequired works perfectly for the string fields, but not the radio fields.
ANSWER
Answered 2019-Mar-21 at 17:38I still don't know why DataRequired (and InputRequired) don't properly work with radio fields, but here's how I solved it.
I subclassed FlaskForm as follows:
QUESTION
SOLUTION FOR FUTURE REFERENCE
Problem was the "tecnico" variable that became 0 at every postback, also to avoid any problem I get rid of global variables data1 and data2 and moved them inside the Bindrepeater routine, like this:
...ANSWER
Answered 2018-Jun-11 at 22:29I think your problem could be your global variables not preserving their new value after postback:
QUESTION
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Kenneth_ForquerENG_115
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Kenneth Forquer ENG 115");
ANSWER
Answered 2017-Nov-22 at 05:13One option would be to check if their answer is among the answer choices before checking if the answer is correct. You could do it like this:
QUESTION
I am trying to convert a Three STL viewer demonstration into an ES6 Class which is then compiled with webpack 2 but i want it to open the file from URL rather than from an actual file input, ive managed to load the three components and most of the class is working but i think i am having problems in the scope with a few of the components, ive ran into a problem i dont seem to be able to get past when trying to use FileReader and then opening the scene and object. TypeError: Cannot read property 'remove' of undefined
ANSWER
Answered 2017-Jul-24 at 16:37after a bit more playing around, and looking at the problem area, i realised that i was applying this to the global variable where this in the context i wanted did not exist, i would like to find a better way of passing this into child functions inside ECMA class functions without using a global variable
updateQUESTION
I am trying to select an element by its data-id attribute. The issue is that it is not working across all elements for some reason. For some reason, the script below will only work on items under the Rotor-Stator category and no other.
Here is a sample of the HTML
...ANSWER
Answered 2017-Feb-23 at 14:06Well because data-id="489 " has space in it just like a few others. Also format your HTML much more otherwise you're up for more problems!
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