# All Questions

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14 views

### Why a factor of 2 appears in gasket force calculation in ASME section VIII div. 1 flange design?

In mandatory appendix 2 of ASME section VIII div. 1 the following calculation is given for calculating minimum bolt load required for operating conditions of a flange joint i.e. , under internal ...
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### 140 km/h 11 kW motorcycle battery calculations help

This is my first post on endless sphere. For a while I have been planning an electric motorcycle build, inspired by the 11 kW Zero motorcycle model. Now while I love the tech of zero motorcycles, I am ...
121 views

### Block diagram vs flow chart?

I was studying a book of control system where i read that a block diagram is a specialized high level type of flow chart So what will be the difference between a normal flow chart and a block diagram?...
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### Calculating Forces using equations of equilibrium

The homogeneous bar shown in Fig. P-106 is supported by a smooth pin at C and a cable that runs from A to B around the smooth peg at D. Find the stress in the cable if its diameter is 0.6 inch and the ...
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### A few questions about cars

When I start the car, why do I hear the engine working when I'm not pressing the gas pedal? How exactly does the torque and power of the gears work? Torque = Radius * Force Power = Torque * Speed ...
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### Pavement Mechanistic-Empirical Design application (v2.3) - Rehabilitation Flexible Calibration Factors

In v2.3 of the software, we noticed that in the rehabilitation flexible calibration tab, there are no standard deviation inputs for thermal cracking. They do appear in the new flexible rehabilitation ...
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### How fast could a human pedal a car? [closed]

Suppose that we were to install bicycle pedals into a passenger car, say a civic coupe, in such a way that pedaling is as mechanically efficient as riding an ordinary bike. Further suppose that we ...
29 views

### basic second order system transfer function - natural period and natural frequency

I have a question about general second-order system transfer functions. I notice two takes on this transfer function. One has a denominator of: $$\tau^2 s^2 + 2\zeta\tau s + 1$$ where $\tau$ (tau) ...
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### How to Calculate the Mechanical Advantage of Parallel Pulleys, and Why?

I am trying to learn about pulleys. I understand why a fixed pulley has a mechanical advantage of 1, as it only changes the direction of motion. Another way to look at it is that the fixed pulley is ...
49 views

### Why is the Cape Elizabeth Fog Signal shaped like this?

On a recent trip to Cape Elizabeth, Maine, I came across this fog signal: It appears to have an electromagnetic diaphragm in the middle, surrounded by concrete and some very curiously shaped steel ...
22 views

### Cad align with point vs auto fit at Cloudcompare via GEOMAGIC Control

I need to compare two STL (Dental model Scanned) files and find the deviation between their points, SO this two STL files have different boundary, so i already used the GEOMAGIC Control software for ...
37 views

### Cause of stepped crack up and away from lintel

What are the likely causes of a stepped crack up and away from the edge of a lintel? See the diagram below.
26 views

### How to produce aluminium powder by E. J. Hall method

I have watched videos on YouTube producing Aluminum powder by mechanical methods. Like this one. It uses Aluminum foil and coffee grinder: There are similar videos which use the same basic method but ...
13 views

I come from Maths background, but recently I encountered problem where a channel is described as "flat fading channel". I would like to make some conclusions based on that fact. I suspect that for ...
34 views

### What is the range of frequency used in TV remote?

Household TV remote control use Infrared rays. Infrared rays have frequency from 300 GHz to 430 THz. What is the range of frequency used in TV remote?
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### Automating the Coolant Top-Up for CNC Machines

I am designing a liquid dispensing system for CNC machines that will top-up a mixed solution of coolant & water at the required concentration. Present concentration in the machine sump will ...
46 views

### Materials science and materials engineering

Good day, I would like to enquirer the followings: What is the difference between studying materials science and materials engineering? Are there any jobs exclusive to those who have studied ...
84 views

### Is there any reason why “inner-flange” style trains are almost universal?

There's basically two ways train wheels can operate, the flanges could be either "inner" or "outer". Switches can be made in equivalent ways for inner and outer flanges. We could expect that, just ...
40 views

### What is the “allowable number of axle-load to failure equation” used in Pavement ME Design?

How is the allowable number of axle-load to failure equation actually used in the software? Is there any documentation regarding the calculation of the tensile strains?
31 views

### What does this bandpass signal equation indicates?

This is the equation for bandpass signal from transmitter. What are the values for different parameters present in this equation. For example, what should be the value of P, Sl(t), Fc etc. Also what ...
149 views

### Can a speedbump safeguard a pipeline located below?

Recently I noticed a concrete speed bumper created near my parking. On enquiring the purpose, the committee who took the decision told me that the purpose of the bumper is to safeguard an existing ...
13 views

### Difference between RK and SRK equations of state in molar volume calculations

I'm doing a simple paper for my postgrad course in Chem. Eng. In this study, I'm just comparing equations of state and the data found in PH diagrams. For Methane, at 263.15 K and 20000 kPa, the molar ...
44 views

### is there a formula to determine if a structure will topple over

as a child all of us have built a tower out of Lego. we built it as high as we could but then eventually it topples over. is there a formula to calculate how wide and heavy the base has to be for the ...
11 views

### Diameter and length socket set screw for KP08 bearing

I got two bearings, but it does not have two socket set screw. Tell me, where can I find the specification for an hexagon socket set screw (which is used in the KP08 bearing)? I could only find that ...
28 views

### bending rigidity of a metal rod

Say you have a metal rod with a square cross section (say 10cm by 10cm) of a certain length. You'd like to make it less prone to bending. Is it better to: keep it the way it is or remove material ...
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### Is the young's modulus of a braided rope stronger than the sum of its parts?

I know that if I have a thin rope of Young's modulus Y, then getting n of these ropes and holding them in parallel gives a Young's modulus of nY. If I was to braid/weave them, does this affect the ...
26 views

### Cannot understand an equation related to impedance. (Power system analysis)

Can someone explain how can we find |Z| term and also from where does the cosine term arrive at the final equation.
15 views

### Relationship between Heat Flux and Engine RPM

I'm doing a project that involves knowing the average steady-state heat dissipation rate of a single cylinder air-cooled engine (through the engine wall and fins) at a given RPM. The problem is that I ...
56 views

### Resolving moments and forces

The calculations for a design I am doing are making me go round in circles. I have simulated the design but I cannot seem to resolve this mathematically and it is really bugging me! Below is an ...
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### Windings for Linear Generator

I have built a small, simple linear generator. It works, but I'm sure it could be more efficient because I didn't know how many windings of magnet wire to use. I know there is a formula I could use ...
22 views

### What is the difference between a bogie and a chassis

Both bogie and chassis seem to define the part of a wheeled vehicle that describes how the wheels are linked together. Are these ...
48 views

### Could an EV reverse to brake?

One of the benefits of electric cars is that many parts can be eliminated, simplifying the overall system. Could EVs eliminate brakes as well by slowing the car down using reverse torque from the ...
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### How to determine if my stepper motor will rotate this shaft

I have a stepper motor with the following characteristics: - Holding Torque: 40 N* cm - rotor inertia: 54 g*cm2 - drive torque 2.2 N * cm This is the system: the shaft is HDPE, and the ...
61 views

### Design Roller Compacted Concrete Pavement Section

I have been asked to consider using RCC instead of traditional PCC on an upcoming project. For a rough order of magnitude estimate, can I assume that the pavement section design will be similar? I ...
40 views

### How do I calculate the compressive strength of a wall?

I literally just have a thin steel wall that stands vertically with a load on top. The thin edges of the wall are oriented vertically with the load applied on top of the top thin edge, with the large ...
20 views

### Press brake tooling for 360 tube?

I’m trying to find out if it’s possibly to form a cylinder or tube with a diameter of 1 inch using some kind of curling die for a press brake. I’ve seen dies that make small 360 degree bends like that ...
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### What do you think are the difficulties in tissue engineering of complex organs such as the heart and liver, as compared to skin?

What do you think are the difficulties in tissue engineering of complex organs such as the heart and liver, as compared to skin?
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### What kind of sensors to be used to measure the carbon dioxyde concentration?

I'm planning a thought project for measuring the C02 in a room (at office namely), and communicating its results to a computer. But I'm blocked at the early stage: which sort of sensor and which is ...
12 views

### Isn't this explanation of speed regulation in a DC shunt motor wrong?

This site:(https://www.motioncontroltips.com/faq-what-are-dc-shunt-motors-and-where-are-they-used/ ) explains the speed regulation of DC shunt motor as follows: If the load on the motor is increased, ...
9 views

### Sound power level of a device with sound pressure level of 56 dB (A), according to ISO 2151

The sound pressure level given in a data sheet was determined in accordance with ISO 2151. To calculate power level from pressure, I need to know the conditions the pressure level was measured (shape ...
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### Root locus: ambiguity on which branch goes where?

I could not find a Controls Stackexchange, I hope this is the right place, otherwise I would be glad to post it in the appropriate section. My question concerns the root locus method. Given a plant ...
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### When does torque applied on a shaft produce bending and when does it not?

In both cases in the picture above torque is applied to the shaft, however in the first case the force $F_{c}$ also produces bending across the shaft. So my question is, how do I know if a torque ...
38 views

### Average Nusselt number or heat transfer coefficient to compare better heat transfer?

I'm simulating different arrays for cylinders in a simple cross flow heat exchanger (cylindrical pipes) as shown below: Inlet temperate(300K) is constant and the cylinders are at constant temperature(...
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### Naming of 1P4A or 5A layer configurations

Glass is brittle and easily damaged. So, a new kind of glass material is made, in which it's layers are made of hexagonal tablets (made of borosilicate glass) arranged in 1P4A or 5A, as happens in ...
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### Heat transfer and rise in temperature

Consider an object of mass M and specific heat C, and initial temperature T1. Let energy is transferred to the object at the rate of W watt. I want to calculate temperature of the object at time t. ...
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### Rotating vertical pole setup

software person here, venturing for the first time in the design of a mechanical system for a hobby project. Please note I have some experience in disassembling, fixing, reassembling mechanical ...
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### Is my aluminium drill swarf okay?

So I've been drilling standard 1/4" aluminium in a small (250W) consumer drill press. I've used a little oil to help, but I'm not sure if I'm doing it right. The holes seem okay though. They're 10mm ...