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6 views

Are these oscillations normal in a boiler?

I recently helped upgrade an old (±20years) 4ton boiler (heavy fuel oil) with some monitoring instrumentation. I decided to have a look at the data and I'm not sure if these kind of oscillations are ...
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0answers
11 views

Does the strength of a servo motor depend on the motor or the power?

I am making a life-size robotic dog, and i am having trouble with getting it to walk as it is too heavy for my 4 micro sg servos. Can i make the servos more powerful with more power? If not i can just ...
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0answers
9 views

Can you get the ratchet mechanism out of a socket wrench by itself? Anyone know where if so?

Title pretty much says it all; looking for a reversible ratchet hub for a special latch that I'm designing. Definitely open to any ideas/sources that the community at large might have. Thanks!
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1answer
18 views

Mesh generation in FEM

When a frame structure is analyzed using a FEM computer software, does the program still generate mesh, even as a line mesh, on frame members, or we must do it ourselves?
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1answer
26 views

Does Finite Element Method use direct stiffness method?

Does Finite Element Method use direct stiffness method? Or it is another mathematical method? We definitely use direct stiffness method to solve frames. FEM is based on entirely this or depending on ...
4
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2answers
397 views

What is a tolerable amount of elongation in steel?

I was looking at the elongation of various steel alloys, and the numbers were in the 10-20% range. Is this the amount of elongation at the point of failure? If so, what is the percentage of ...
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3answers
41 views

Can I safely cook on High temperature paint?

Like a million others, I have a set of enameled cookware that has seen enough use that the enamel has boiled, burned, or chipped off down to the cast iron substrate. Surprisingly, the outer painted ...
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1answer
32 views

Braking movement of a chain through a pulley or sheave

I am attempting to build a rotating climbing ladder, similar to the one below. The structural supports will be different, but the mechanism of chain (or cable) running in a loop over pulleys/sheaves ...
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1answer
20 views

How to make a 500+ psi water gun staff

I would like to create a life size lego Bionicle Aqua axe(gali nuva Type or gali master of water Type). The problem is unlike The trident in this video: https://m.youtube.com/watch?v=NK6MWt7vpVE&t=...
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2answers
37 views

How can I find deflection in a member that doesn't have a constant area moment of inertia?

I'm trying to calculate the maximum deflection in a simply supported member with a uniformly distributed load. The trouble is this member does not have a constant area moment of inertia. I've drawn a ...
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0answers
16 views

What is the use of streamlines in Fluid Mechanics when velocity fields seem sufficient?

So, streamlines are a family of curves which, for every instant in time, are the velocity field envelops. And in general, envelopes of a vector field are the curves whose tangent vector at each point ...
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0answers
17 views

PMDC Motor Characteristic Graph

I am trying create a graph similar to as shown below. However, I am confused as to how the torque is related to the characteristics. The graph that is to be replicated for certain parameters: The ...
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2answers
35 views

What is the maximum temprature that could be achieved by compressing air?

We know that compressing air produces heat but is it possible to achieve temprature of 700degree C just by compressing air. If not what will be the maximum temprature that could be achieved?
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1answer
23 views

Best solution to fix loose bolts problem, on delicate/ fragile surface?

Most common practice to fix loose bolts is using washers, but while using washers and tightening the delicate surface gets damaged, so what are better alternatives to fix loose bolts problem
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1answer
15 views

Can air be ionized using microwaves?

I have been doing a good bit of research lately into a new form of electric "jet engine" developed by researchers in Wuhan, China; in the article summarizing the technologies used to produce ...
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0answers
20 views

I'm trying to deduce how this Automated Packaging System from the video works in terms of the sequence, the cylinders used and the instruments used

This is how it goes..... Link to the video: https://www.youtube.com/watch?v=ASNa_mxQbS4&feature=youtu.be For the cylinders, I guess they use Cylinder A for activating an effective mechanism to ...
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0answers
16 views

Simplifying the soda gun mechanism

I'm looking to design a push button mechanism similar to the soda gun where water is forced to pass through a single passage based on which button has been pressed. What are the different approaches I ...
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0answers
8 views

Import Coordinate System as Marker in MSC Adams

A very simple question, yet I couldn't find an answer: I created a simple part (e.g. in SolidWorks) with one solid body and two Coordinate Systems. I would like to place my Joints, Revolutes, etc. in ...
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0answers
18 views

Transformer Phase Fault

I have a transformer for troubleshooting. It is a 3 phase DELTA-WYE Step down (11KV/400V) transformer, the low side voltages (secondary) are Line to line voltages: RED-YELLOW : 400 V YELLOW - BLUE :...
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2answers
492 views

Is it possible to build an efficient Electric Vehicle engine with minimal to no computing control systems?

First of all, I am neither an electronic nor a mechanical engineer, so if some of what I say sounds ignorant, that's most likely because it is. I have been thinking about this for a while now. I love ...
1
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1answer
23 views

How to interpret the phase plot from an accelerometer on vibrating machinery

Attached is a plot of amplitude vs frequency and on the inset phase vs frequency. I have constructed this phase plot via $\arctan\left(\frac{Im}{Re}\right)$ How can I interpret the phase plot or ...
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1answer
31 views

Modeling the structure vs FEM

When you model the structure to be analyzed with a structural analysis program, indicating the beam elements, shell elements, nodes, rigid links etc... The analysis is still called Finite Element ...
3
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2answers
46 views

How high will a flywheel catapult launch a payload?

First off, this is not a homework question or anything like that. I'm trying to build a catapult to launch a payload using a flywheel as an energy device! It goes like this: The flywheel spins up to ...
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0answers
15 views

What is the pressure of water-dew resulted from cooling of atmospheric air down to dew point temperature?

Suppose, In a room, Air is at 1 atm presssure. So should be the pressure of any water surface in the room. If the room temperature is cooled downed to dew point temperature, vapor (moisture) will ...
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0answers
16 views

how to Implement linear tetrahedral elements for finite element computations? [closed]

I am trying to implement 3D tetrahedral elements in my finite element code (which works fine for linear triangles and quadrangles in 2D). But my simulations are crashing with tetrahedral elements. My ...
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0answers
15 views

Can the signal reflections from seismographic surveys be intercepted and interpreted to produce valid results

I am watching the news about Turkey conducting seismographic surveys in the Eastern Mediterranean and from day 1 I have been wandering if a "listener" can record the sound produced by the ...
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0answers
26 views

Determine Heating costs in $/kWh for a specific location

Suppose I wanted to find the average heating price for a specific location in the US, where: heating_price: The price of equivalent unit energy intensity of heating energy source (e.g. natural gas), ...
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0answers
5 views

Remote point vs point mass in Ansys

I have seen the feature of promoting a point mass to remote point and I cannot figure out what are the use cases of using that feature. I understood that you can add command snippet below remote point ...
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3answers
53 views

Buckling of Parallel rods

I am trying to calculate critical force $P$, if two rods (same diameter and length - rigid fiberglass sandwiched on two steel plates) are parallel to each other. $$ P = \frac{\pi^2 EI}{(KL)^2} $$ I ...
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1answer
36 views

Laser saturation and laser saturation intensity

Can someone explain what is laser saturation and laser saturation intensity? I don't find a proper definition and it seems to me similar to steady state intensity.
3
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2answers
51 views

Can you use an accelerometer to measure beam deflection under static loading?

With an appropriately collocated accelerometer is it possible to retrieve lateral deflection of a beam under static loading. The beam will be loaded and then deflect until it reaches equilibrium with ...
0
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0answers
21 views

Smart inverter washing machine or conventional machine? [closed]

Should I buy a Smart inverter washing machine or conventional washing machine? Inverter machine is only slightly expensive than the conventional one and I like the features of the inverter model I ...
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0answers
19 views

MatLab Electrical Engineering Question [closed]

I cant figure how to design a control form from this level of information, this is all I have been given. When it says design a control of the form G(s)=K/s does that mean a denomiter of s^2 + s + 1 ...
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0answers
33 views

Thermography - objects appear hotter than they are

recently I started working with IR thermal camera (Hikvision DS-2TD1217-3/V1) and I have a slight problem. The camera works fine when there are only people in the image, however if I place a hot ...
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0answers
10 views

How to model leaning columns in opensees?

I want to modelling three buildings next to each other in opensees software . Duo to modelling leaning columns , buildings overlap with each other . Now my question is that for 3 adjacent buildings ...
3
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0answers
32 views

Aerospace bolts and washer combination

In my aerospace company we have repetitive discussions regarding the stacking of low tolerance fasteners with non-countersunk washers. For example a fastner NAS6703-X (size 10) has a max. base radius ...
0
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1answer
38 views

Bending of an L-shaped beam

First post so bear with me: I am designing a frame for a press, which needs to be able to withstand 250 N. I am planning to make the frame an L-shaped beam, turned around. With a side view, it will ...
1
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1answer
34 views

On the steam locomotives, why was the driver's cabin not located in the front of the boiler for better visibility?

I always wondered how the drivers of steam locomotives could observe the road.
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0answers
19 views

Finding an Engineer for a Trailer project [closed]

Can anyone tell me how I would go about hiring an engineer for a small trailer project? I have read many posts, and it seems that I want the same thing a lot of people want...I want to make a trailer,...
2
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2answers
64 views

How to calculate miter angles for an angled stretcher

See the image below: When I lay this out in Fusion, I can get the angles but I can't figure out how to calculate it mathematically. The goal is to have the angled stretcher fully contact the upper 45&...
0
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0answers
24 views

Generator cut power suddenly [closed]

I have a generator that I use every once in a while and the other day it just cut the power suddenly. The motor kept on running but the generator wouldn't produce any power. I measured it with a ...
0
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0answers
21 views

Mdf cutting seems to require absurdly low spindle speed for the right chip load

I've been trying to calculate the correct spindle speed and feed rate for my setup and it took me to some absurd settings. Can you do the math and check the sources hand in hand with me, plase? My ...
1
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1answer
22 views

How to use MERRA data in Pavement ME Version 2.6 for rigid design?

We are testing out Pavement ME, Version 2.6 on our server, and we can't figure out how to import the MERRA Climate Data for rigid pavement designs. We have followed the steps outlined in the help ...
1
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0answers
39 views

Moment of a force in 3D

The question is not to help me get my task completed. There is the 3D statics problem that I have been attempting to solve for a long time. I have no help, hence I would like to pose you a few ...
1
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0answers
33 views

Statics - other methods for determining reactions of supported beam

Question: Because the question regards the statics, I am going to pose it as well. Are there other methods to solve equilibrium problems other than the method of sections, when dealing with pivots. ...
2
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0answers
28 views

Internal Tent Temperature

Here is the problem I am working on: "Consider a perfectly sealed polygonal tent with the sun directly overhead. The solar irradiance of a surface 90° to the sun’s rays is 1,000 W/m2. However, ...
1
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1answer
49 views

transformation matrix from the original reference to the main reference

Consider the state of tension in the neighborhood of the point $ P $ represented in the Figure. Determine the principal directions of the stress state in $P$ and write the transformation matrix from ...
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4answers
61 views

Why one big cargo ship is more efficient than 10 or 100 smaller ships?

Given the fact that small container ships are easier to manufacture than big container ships.. then why is it considered better to build bigger ships instead of many smaller ships? And to see why ...
1
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2answers
55 views

why do centrifugal compressors have curved blades?

Why are centrifugal air compressors built with backward curving blades?
0
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1answer
19 views

Specifications of Tensile Test Specimen?

I am Currently Working on Measuring Various Mechanical Properties of Metalic Materials using Universal Testing Machine (UTM) at Various Temperatures. I know that for Testing at Ambient Conditions, ...

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