# All Questions

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### erroe in running matlab cide

anybody can help me with this error. It is very important and emergency. Thanks "Error using fis_1 (line 98) Unrecognized method, property, or field 'params' for class 'fismftype2'. Error using ...
4 views

### How to use confidence level in this problem?

The effects of cutting speed (A) [1000 & 1200 rpm], tool geometry (B) [Type i and Type ii] and cutting angle (C) [12-25 degrees] on the life of a in hours of a machine tool is studied each ...
15 views

### Do the tubes of an automotive radiator flow in parallel or series?

The radiator in my car is damaged. One tube has a severe gash in it. I need to drive the car about 100 km before I can get a replacement radiator installed and coolant drains too fast to reasonably ...
29 views

### What is the frequncy range of seismic vibrations?

I'm working on a structure which needs to sustain common seismic vibrations due to earthquakes. So I want to do some modal analysis to find natural frequencies of the structure and make sure they are ...
32 views

### Analysis Of Braced Frame By Hand Calculation

Suppose we have a rigid jointed, statically indeterminate frame with bracing as shown below: Note: there would also be a distributed lateral load along at least one side of the structure and all ...
32 views

### Is there anybody who can explain about the structure of this wooden screen? [closed]

Is there anybody who can explain about the structure of this wooden screen? i need a design of it. (...)The parts broken were at least five feet removed from Slade, who had his back to the screen; but ...
22 views

### Ship Resistance [closed]

How do I calculate the resistance of a ship, when I only have the actual ship parameters, L, B, D, T, and speed. Froude's number is low as well. How do I do this without any scaled-down model?
22 views

### What is the meaning of “load case consistent” in stress analysis terms?

I’m a (junior) stress engineer and have been tasked with sizing a lug. Various loadcases have been run through FEM and loads have been distributed into the lug bolt for each. In other words, each ...
28 views

### How to decrease Nitrogen gas consumption in Iron & Steel Plant? [closed]

I need to decrease nitrogen gas consumption in iron & steel plant. Currently it's not possible to measure every dot from steel mill to determine real usage so they use what air separation unit ...
11 views

### Dimensioning holes through a hollow shaft

I have three types of holes in a hollow shaft that are perpendicular to the shaft. The first type of hole go only through to the centerline. The second type go all the way through (i.e. out the other ...
18 views

### What's the rationale for closely spaced standard LVL sizes?

Generally LVLs in the US seem to conform to heights that were historically used for solid lumber. e.g., 5 1/2" is the height of a nominal 2x6. This makes sense because presumably LVLs had easier ...
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### What causes an inflated spherical cap to look more like a mountain?

I'm working with bulge tests of materials using biaxial loading (applying pressure from one side through a circular aperture). The materials are clamped on the edges. The diameter of the aperture is &...
643 views

### What are 1 ball and 2 ball bearings?

When looking at various small fans (like those found in a computer or the bathroom) you often see in their specifications the type of bearings they use. And the typical values there are either "...
44 views

### Torque / power needed to move 5000 kg

I am trying to find the required Nm of torque to move 5000 kg on a rail that is submerged in 10 meters of water using a hydraulic motor. Mass / load: 5000 kg Speed : 5 meters / minute Wheel dia : 250 ...
43 views

### Welding Carbon fibre

How do you weld carbon fibre to another piece of carbon fibre? If it can't be welded together what other solutions are there for connecting carbon fibre together?
27 views

### Is sitting on a double-decker bus's upper deck more hazardous than sitting on its lower deck?

Many people online allege feeling more 'wobbly' or 'unstable' while seated on the upper deck, than on the lower, and that in an accident, sitters on upper floors are more likely to be ejected out ...
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### Why couldn't they create objects with the same “high resolution” as they can today, in the 1980s? [closed]

If you compare hardware or any kind of physical structure manufactured by a factory in the 1980s and one today, the former appears quite "primitive" somehow, in spite of being "high-...
18 views

### Ash size particle dependency of initial coal particle size in fluidized bed combustors

I'm looking for information on coal ash size in fluidized beds. How dependent is it on the initial coal particle size? Would I expect ash from 5mm coal particles to be significantly larger than ash ...
14 views

### How is it possible to build compact Terawatt continuous-wave lasers? [closed]

I have designed an interstellar spacecraft called Solar One. It employs a combination of 3 propulsion methods: nuclear fusion, beam-powered propulsion , and photon propulsion. Basically, several ...
21 views

### Point load acting on a table, determine the dimensions of the table legs [closed]

A square table with 4 legs are subjected to a point load of 1000 N at its geometric center at its top. Determine the dimensions of 4 legs of the table. This is a question asked on a number of ...
14 views

### Freewheels to fix direct shaft drive

Is it a valid solution to install freewheels between axel and wheels in order to allow the exterior wheel to spin faster than the interior wheel when turning in a system where the shaft bring the ...
28 views

### Why culmination points in tunnels?

The shortest connection between two portals would be a tunnel with constant gradient. Why do long tunnels instead rise from both portals to a culmination point, introducing unnecessary steep gradients?...
18 views

### What is the structural factor in context of wind loads?

Coefficient called "structural factor" appears in building codes when calculation of wind loads in discussed. The wind load is proportional to this factor. I have a lot of trouble ...
69 views

### Are there differences between Ice Packs?

My girlfriend will get a refrigerator from the landlord, but right now she hasn't one. But she has a freezer. So we will get ice packs (images: 1, 2, 3) and use a cooling box for the time. Now I was ...
30 views

### Move part on driving shaft using threads

I have imagined the following setup: Rough dimensions: Diameter shaft: 6mm Diameter inner part: 20mm Diameter outer part: 40mm Would the inner part slide along the shaft when turning the shaft, ...
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### How to weld a copper flange with a Nickel alloy pipe?

I have a copper flange and I want to weld it to a nickel alloy pipe. Normally, which welding technique is used to join these two parts? Also what is the filler material to be used to weld a copper ...
44 views

### Were steam locomotive fitted with centrifugal governor?

Wikipedia states that steam engines were fitted with centrifugal governor to keep a rotational speed almost constant. For steam locomotives, Wikipedia speaks about regulator but nothing about the ...
28 views

### Tiled/block pavement used to pave high traffic roadway?

We're normally paving the high-traffic road with concrete or asphalt. While for sidewalk/garden, we use pave block/tiles (either concrete or else) Common reason is because pave block/tiles doesn't ...
40 views

### Gain and Phase Margins from Bode Plot

What's the interpretation of the margins when the curve of magnitude never crosses 0 dB or the phase curve never crosses the -180º? For example: $$G(s) = \frac{s+20}{(s+1)(s+7)(s+50)}$$ I know that ...
15 views

### Engage and disengage DC motor from free-spinning reel

So i want to have a reel (~4cm diameter) that will pull a ~80cm string with a torque of ~8kg-cm (edit: thanks for the clarification). To pull I want to use a gear motor. E.g. 12V DC motor like this: ...
10k views

### Are toasters really electrified inside of the “slots”?

My mother was born 1950. Me in the mid-1980s. All my life, she's been saying that I must never stick a metal object, such as a knife, into the toaster, because it will electrocute me. I've always been ...
21 views

### error in matlab using fuzzy type-2

I have a project in MATLAB and SIMULINK. I have to use this code "convertToType2" but after running the project there is an error as following: "Undefined function or variable '...
17 views

### Autodesk Inventor Place Component with User Parameter Length

I have some user parameters which I set in "fx": Now I need to place standard square tube ("Place from Concent Center") with a length of ...
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### 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 ...
69 views

### Would a sacraficial anode be used to protect large boat (aircraft carrier) or is there something different?

I did the calculation for the surface area to anode ratio (zinc) for a project recently. It was my first time going through this exercise, and I ended up with a 7.2% number for surface area ratio (...
25 views

### Calculating final drive force from engine torque and tyre spin ratio

Trying to build a simplified physics simulation for cars, along the lines of "Car Physics" by Marco Monster. I'm stuck at straight line acceleration. I don't know if I understand the ...
36 views

### Door Design Calculation

I am in process of designing a door; Mass = 370kg Width = 535mm Height = 878mm Thick = 100mm max angle = 120 deg I have done calculations to size the hinges; just struggling with the force ...
45 views

### Any Idea of This China's “Transparent Concrete”?

I am currently make an attempt to make miniaturized version of this China's solar highway on my garage https://www.youtube.com/watch?v=zK8FvzI3yDA Just so i can re-evaluate the performance However, I ...
78 views

### Difference between Linear Force and Force about an Axis

I am confused between How forces work when applied in singular linear direction vs Force Applied to a continuous mass about an axis(example to rotate it). Example 1: Consider an object of mass $m$ ...
53 views

### What is the purpose of those “dual parasols”?

Watching a live video stream from South Korea just now, I noticed these parasols in the background. They look like normal parasols but have two "layers". Like a hole in the top with another &...
19 views

### An indeterminate beam with two spring attachments [closed]

So I need to solve this question using stiffness matrix method. But I am really confused about the springs.
21 views

### What is the axial temperature distribution for a electric heating tube

Is the axial temperature distribution uniform for a simple and cheap electric heating element such as shorturl.at/tEJSU I understand that the current that is passed is same along the tube but not sure ...
56 views

### Engineering calculations in a tool that will handle units

I know Mathcad handles units along with numbers which makes it easier to avoid errors by tracking units the way we would by hand. e.g. 250 kW + 500 W I just ...
13 views

### d40cy1 refrigerator compressor speed control resistor values

I have a bar fridge with a d40cy1 compressor in it. I can't find an manual for it. I would like to bypass the thermostat and speed control and force it to run continuously at its lowest speed. I ...
47 views

### Bending moment when there are no constraints

I faced this problem in an old book (Hall Allen S., Theory and Problems of Machine Design; 1961) The answer according to the book is 592 [in.lb], but I think the bending moment should be 0 because ...