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Questions tagged [mechanical-engineering]

Questions within the problem domain of mechanical engineering. Mechanical Engineering can be a broad field; consider choosing more specific tags if they apply.

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Recommended torque

I am working on an assembly where I have various screws, mainly metal on metal fastening. Where can I find a realiable source for recommended torque settings based on screw size, screw material and ...
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1answer
29 views

Is there is vanadium-free high speed steels?

Vanadium is present in all high speed steel grades. unfortunately vanadium not only very expensive but is also a will known cytotoxic metal. some workers get severe persistent cough lasts for months ...
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Please help solve this problem! [on hold]

Fluid with mdot = 0.025 kg/s and Tm,i = 25oC is flowing through a long metal cylindrical tube where the diameter is 0.032 m and the length is 2 m. The surface of the tube is heated with a heat flux of ...
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Designing a piston pump for windpump

I am designing a savonius type wind pump for low wind speeds(avg speed = 2.7 m/s), with these speeds and rotor area of about 2 m2. Acc. to my calculations, I am getting a volume flow rate of ...
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Yield stress and tangent modulus of Silicon and Al2O3

I searched a lot for the values of yield stress and tangent modulus of Silicon and $\text{Al}_2\text{O}_3$ on the Internet. But I was not successful. Is there any help to find them?
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1answer
27 views

What is relief amount in grooving operation

Can somebody please explain what relief amount at the end of cut in a grooving operation on lathe is?
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1answer
30 views

Calculations of compound gears?

Recently I've been scratching my head over an assignment, and I have trouble understanding a couple of the parts. The issue I have is with the overall calculations, since we've just started on ...
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10 views

Finding the W in piston-cylinder system

I am tried to solve this question by using, $Q-W=\Delta U$, where the kinetic or potential energy differences are neglected. I changed the equation to $W=Q-\Delta U$ and also to $W=\Delta H-\Delta U$....
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50 views

How can I do engineering projects for money at home? [closed]

I am a M.Sc. graduate in mechanical engineering and I have experience with engineering software, like MATLAB, CATIA, and ABAQUS. I want to know how I can find industrial projects like finite element ...
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1answer
27 views

What are rules of thumb for designing a gravity feed system for cylinders?

So, I just printed out this battery holder off Thingaverse. Unfortunately, it doesn't work very well, so I'm interested in redesigning it. There's a number of issues but the most annoying one is ...
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1answer
50 views

Calculating the Braking Energy of a vehicle

you might find my question stupid. I am unfortunately not an engineer and didn't find the answer on google. I want to calculate the braking energy of a vehicle decelerating from v2 to v1 (km/h). ...
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1answer
37 views

compression buckling under lateral load

I'm trying to figure out what size of round tube to use for a tensegrity structure that'll probably have people climbing on it. The rigid elements are 21' steel tubes, and in normal cases they ...
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1answer
53 views

How do we know that deformations occur in a uniform fashion throughout the length of shaft?

When equal and opposite torque act on the two ends of a circular shaft,how do we know that deformations occur in a uniform fashion throughout the length of shaft?Is it because that all cross section ...
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1answer
43 views

stress/shear analysis of components

I am working on analyzing a few problems, but have not really come across this type of stress concentration problem. Does anyone know where I can study the analysis of this situation? Pressing ball ...
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1answer
17 views

Minor loss due to splitting of pipe

I am solving pipe flow problems and it came to my mind how does one find out the minor loss associated with the splitting of pipe. Here how does one find the minor loss associated when the flow is in ...
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0answers
61 views

Analytical six-bar linkage trajectory solution

Six-bar linkage is shown on the image: It has one degree of freedom, so if one of the variables is constrained, it's possible to calculate the positions of all the joints. In this specific case the ...
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2answers
32 views

shearing force distribution in a trapezoid

I need help figuring the distribution of a horizontal shearing force in an elastic solid trapezoid. When force $F_1$ is applied to all the top surface of the trapezoid, at equilibrium, is the force in ...
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19 views

Reference on how to design belt tensioners?

I am designing a system in which I need to use a belt drive transmission. It is rather small (I am using a maxon EC-max 16 8 Watt motor). I found a set of timing belt + pulleys set that I plan to ...
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2answers
34 views

How to calculate stress in a cylindrical-uniaxial-loaded bar with sudden changes in its diameter

How can I calculate the von Mises stress in the cross-section of a bar like this that is axially loaded?
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14 views

Error analysis in venturimeter

A fluid having specific gravity $0.82$ and viscosity $1 \times 10^{-3}Ns/m^2$ flows through a $0.3m$ diameter line in a refinery.The flow rate is expected to be $140-180$ kg/s.The flow rate has to be ...
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24 views

using a lever when the fulcrum is also the load

There is a wonderful Youtube video of a man moving 2000 lb blocks manually trying to explain how Stonehenge was made. The gentleman from michigan shows how easy it is to move a 2000 lb block by simply ...
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0answers
16 views

What height adjustment mechanism could I use for a headset stand?

Doing a project for College and cant think of any ways to make the top section of the headset rest height adjustable, was thinking of using a rack and pinion but within 10mm width it might not be able ...
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31 views

Calculation of critical internal thread according to VDI 2230 Part 1

I’m doing a “Systematic calculation of highly stressed bolted joints – Joints with cylindrical bolt“ according to VDI 2230 Part 1. In step of calculation R11 “minimum length of engagement”, when my ...
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26 views

How do i go about finding the principal stresses in this mechanics of materials problem? [on hold]

i am doing some mechanics of materials review and i have an assignment due toworrow, but my professor didn't really provide many examples and none involved multiple torques involving all three ...
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23 views

Modeling Water Flow Through Saturated Medium

I am working on a project that uses a variable-speed pump to achieve a desired pressure across a medium (coffee grounds). The system includes a pressure sensor in-line between the pump and the medium. ...
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112 views

Vehicle Dynamics Problem: Cornering wheels must slide on the road

Can anyone see this geometric fact that cornering wheels must slide on the road? What I mean is that the tread within the contact patch of the rolling wheel, which is travelling along a curved/...
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How can pitot tubes give us local velocity in a flow

I am studying about static pressure,dynamic pressure and the principle behind pitot tube. However in pitot tubes we apply Bernoulli equation between two points which are not on the same streamline. ...
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1answer
20 views

How to use the moment-of-momentum equation for water flowing through a pipe?

I am having a lot trouble understanding this problem, I don't even know where to begin or how to articulate my difficulties, but I will try my best. Is the question asking to find the torque ...
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0answers
29 views

Batter Hitting a Ball

Consider a batter hitting a ball. The ball exibits elastic deformation and rigid body translation. When will it happen that whole of the energy supplied by the batter is consumed in Structural ...
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1answer
21 views

Flux and Normal Derivatives

Could someone please clarify the difference between flux and normal derivatives? I am studying PDE's and I came across Neumann Boundary condition (In this condition, the value of the normal ...
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0answers
25 views

Engine power and torque of a vehicle

Having the Power/Torque-RPM curves of a vehicle, how can we derive the engine power equation and the torque out of these curves with respect to time?
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0answers
33 views

Does speed matter while one steel part is pressed into another?

If one press some steel part into steel hole to get unsplittable assembly, does this operation speed matter? Is it better to hit by hammer, or to slowly jam with vice? Does it relate to steel type (e....
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2answers
18 views

Connector for sliding plate to rotating rod

I want to couple a plate, which cannot rotate but only slide along a track, with a threaded rotating shaft. This is for a grip setup, where rotating the rod presses the plate forwards to apply ...
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1answer
29 views

What's the second moment of a T beam with a heel? [closed]

The second moment of area of a rectangle is $I_{yy} = \dfrac{bh^2}{12}$ b : base h : height What is the second moment of area of a T beam like this one?
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1answer
25 views

Moment of inertia calculation at different axes [closed]

I have moment of inertia at 2 different axes orientation. How to calculate the angle between the 2 axes?
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17 views

Intake Mechanism with Obstacle

I'm not exactly sure if this is where I'm supposed to ask, but engineering stack exchange is the closest because my question is about robotics. I'm sorry if this doesn't fit. Question: Are there ...
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1answer
91 views

They survived an elevator fall. How?

In this incident https://www.bbc.com/news/world-us-canada-46274458 an elevator was described as falling 84 floors, but all survived apparently with little or no injury. It would seem that the car did ...
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1answer
26 views

How to use the linear momentum equation to determine the forces required to hold a nozzle stationary?

This is the problem I'm trying to solve: I'm looking at the worked-out solution from my professor and it shows that the sum of the forces in the x-direction is equal to: [d/dt(momentum) in the x-...
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18 views

Ways to measure ultrasonic frequency, intensity and penetration depth from a source?

Let's say I have a source located in an atmospheric medium (i.e an ultrasonic device or a natural source) that radiates ultrasonic waves. What types of equipment (mechanical and/or electronic), ...
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2answers
30 views

MANUFACTURING PROCESS: ROLLING PROCESS

In the rolling process, Why should the velocity of the strip at the entry before coming in contact with roller be lesser than the velocity of the roller?
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1answer
21 views

Derivation of specific helmholtz function relationship for an ideal gas

The question is to prove the following form of helmholtz function for an ideal gas $$f=C_v (T-T_0)-C_vT \ln \frac{T}{T_0} -RT \ln \frac{V}{V_0} -s_0(T-T_0) +f_0$$ I tried using $$df=du-Tds-sdT$$ Now ...
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23 views

Automobile Braking

I am trying to develop a motorcycle braking system as part of a project. I need to calculate the braking torque that need to be applied to stop the vehicle. Given the parameters like mass, ...
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0answers
39 views

Shaft which can independently rotate and translate axially

I would like to mount a sensor onto a shaft which can be translated axially as well rotated independently. This arrangement permits me to capture a 360 deg scan and then translate the shaft axially to ...
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1answer
33 views

Calculate hydraulic torque from motor HP, hydraulic pump and gearbox

I am curious about the design considerations for a hydraulic system. Let's say you have a 3HP 1200RPM motor you also have a hydraulic pump that's rated 4LPM and pressure of 40MPA rated for 40RPM MAX ...
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39 views

How do you calculate the frictional losses in wire ropes over sheaves?

I am currently pulling a load with a wire rope that is moved through a system of sheaves, but had to replace a smaller wire rope cable (1/2") with a larger wire rope cable (3/4"). The sheave/wire ...
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1answer
44 views

Is there such thing as supreme board for international arbitrators?

My cousin is a mechanical engineer, got contacted today from someone who claimed to be working for the supreme board for international arbitrators (sbia) and ICAC in the Middle East and north Africa ...
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0answers
33 views

Strain gauge - Non-uniform strain distribution

If the strain gauge is placed in the area of non-uniform strain/stress distribution, will the gauge average the strains along its lenght? The gauge will not be able to capture local maximum strains, ...
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0answers
29 views

How to select the distance between two starwheeels holding a bottle?

If you have some experience in th field of packing and filling can you tell me which two areas should i choose to support the bottle with two starwheels ? I think the red area should be supported as ...
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1answer
59 views

Why there are no jets (missile or aircraft) faster than Mach 3.3?

Fastest plane ever built: SR-71 ,Max Speed: 3.3 Mach , Development - 1950s Fastest drone ever built: Lockheed-D21 ,Max Speed: 3.3 Mach, Development -1960s Fastest cruise missile ever built: Brahmos ,...
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19 views

Joint Revolute or Fixed?

a shaft is driven by a motor, it is supported in two places by ball bearings and connected in third place by a motor. how can I use this example in Ansys WB? 1. variant : two places, where the bearing ...