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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What is the name for a design element which includes trusses within a member?

I cannot think of what to call this design technique, where a truss-like structure is used within a member to provide strength and rigidity with minimized weight. I’ve included a picture which ...
Catradora's user avatar
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A mechanism that modifies the sine wave so it is flattened at its peaks

Piston displacement as a function of time produces a sine wave. I need to modify the motion so the time the piston spends at both the bottom of the stroke and the top of the stroke are extended. The ...
teliocide's user avatar
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Activate a mechanical end-stop with a lever

I would like to be able to record the motion of the shafts on a loom. I have some mechanical end-stops, and would like to trigger them with levers that raise and lower when the treadles at the base of ...
Ellinor Linnea's user avatar
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Mechanical Rotation about a Virtual Axis for Robot EOAT

I am working on a robotics application where we are erecting a cardboard box and stapling the ends shut. I need control over the "top" end flap to make sure it is out of the way for the rest ...
Aaron Holwick's user avatar
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Vertically oriented shaft sleeve rubbing against bearing - Calculating side load due to a certain amount of tilt

At some given angle of tilt, we will perceive the pressing of a rotating SS shaft sleeve against a greased bronze journal bearing. How would you compute the side load force on the bottommost bearing ...
Adrian Beltran's user avatar
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How can I calculate the pressure in a pipe?

I am an engineering student designing a pipe system for a fluid flow and I calculated everything including the pressure loss. Now I have to choose a pipe material and pipe thickness for the piping ...
Armis's user avatar
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Why does/doesn't this structure qualify as a truss/frame?

I am learning about the basics of truss analysis in mechanics. As part of this, I learnt that a truss/frame is composed of at least 3 members, its joints are pinned and that any loading is applied at ...
Guest3301's user avatar
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Creating a state-space representation (.m format, Matlab) via Simcenter 3D (NASTRAN) using Component Mode Synthesis Reduction

I'm trying to create a state-space representation of my FE-model using a "Component Mode Synthesis Reduction" (general form of Craig-Brampton reduction). The picture underneath shows (...
Aeropin's user avatar
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Need help analyzing torque transfer and slippage condition between parts

I have a scenario where Plate A (light blue) shown in the image below is being pressed against two different plates that are in contact with different sections of Plate A. I would like to know which ...
SoloLeveling's user avatar
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How do you calculate the energy released by a gas spring when it is released from being fully compressed?

I'm a Freshman Mech E Student, and I'm designing a 3lb Combat Robot for a club. I wanted to be weird and use something I've never seen on a bot before. It's a fun design challenge, but physics ...
TechNicly's user avatar
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Orifice flow meter equation applicability, modeling leak flow

I am trying to determine the correct equation to model ideal gas flow rate through an orifice as a function of pressure. The equation below I found in Marks' Handbook for Mech Eng 8th Ed, p. 3-64 ...
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New to AutoCAD, trying to accomplish a simple task of trying to simulate how much force can a U channel withstand

Sorry if my question or parts of it seem vague or stupid, I'm fairly new to mechanical engineering. I'm part of a team that is building a simulator platform and I am mostly at the helm of the software ...
Zeshan Noori's user avatar
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How can a slipper assist clutch on a motorcycle provide a friction zone?

Most modern motorbikes come with a slip and assist clutch - this is typically provided by a mechanism of ramps that will force the clutch plates apart when the engine drives the wheel under hard ...
rep_movsd's user avatar
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Can a scroll compressor be used to generate power?

Scroll compressors are efficient, reliable, and a fill a pressure/flow niche in the array of available compressor technologies. However, I have never seen one used the other direction for generating ...
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What specification describes best a bulldozer "strength"?

Bulldozers are tracked-type tractors designed to push soil and heavy objects. In a typical specification sheet, the following are listed: Flywheel power (hp or kW) Gross power (hp or kW) Engine ...
Triceratops's user avatar
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How to interpret the Otto Cycle PV diagram?

AFAIU this is the practical Otto cycle with the added isobaric stroke for when the piston intakes and expells through the valves. However, there's one thing I don't understand: AFAIK, PV diagrams ...
popeye's user avatar
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Total dynamic head calculation of a submersible pump with different dia pipes connected to its discharge

I have to install a submersible pump for pumping ground water to irrigate land. I have six inch diameter metal pipe already available that I plan to use in the project. The pump delivery is 5 inches ...
Bilal Khan's user avatar
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Why does the specified installation torque for a wedge anchor result in a tensile force that exceeds the anchor's ultimate tension specification?

I have been reviewing the specifications for Red Head Trubolt wedge anchors. I am confused by what appears to be a contradiction between the specified installation torque, the resulting installation ...
SLax's user avatar
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Why does CFD over predict shockwave in comparison to wind tunnel?

I ran a CFD simulation of Mach=0.85 flow over an aerofoil and noted that my Cp (coefficient of pressure) plot over predicts the shockwave in comparison to experimental data? Can someone please explain ...
Lerman's user avatar
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How can we calculate the combined stiffness of a spline connected to a straight member?

I have a geometry that looks something like this. What will be the combined stiffness of the members?
Ahsan Cheema's user avatar
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Does gold have elastic behavior?

I know structural steel is considered to have an elastic behavior and after a certain deformation, it has a plastic behavior. How about gold metal?
Megidd's user avatar
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Where is vertical axis of rotation when we observe car yaw?

Where is located vertical axis of rotation when we observe only car yaw, is this axis at different places for different angles of steering wheels?
user707264's user avatar
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Confusion regarding SI units of K (stiffnes)

I know that stiffness, K is equal to product of moment of inertia and square of natural frequency K = Jωn2 Where K = stifness, J = moment of inertia and ωn = natural frequency SI unit of J is kg m2, ...
DSP_CS's user avatar
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How does a fighter craft rebalance itself after it fires its munitions and missiles?

How does a fighter craft rebalance itself after it fires its missiles? Each missile could range anywhere from 40kgs up to 750kgs depending on the model. I am curious to know how a fighter craft ...
Rohit Samant's user avatar
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How to engineer a click from small concentric discs

I am designing a device which clicks when rotated so as to wake up an accelerometer, allowing the device to run on low power and wake to take a reading. I have access to SLA and FDM 3D printers. When ...
Jaspal Singh Rathour's user avatar
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How do mechanical engineers, in practice, account for drag/air resistance when designing machines?

This is a question I've had on my mind for a while. I was recently looking at machine in operation: it was a machine which had a bunch of vertical spindles holding yarn bobbins, rotating at a high ...
User2956's user avatar
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1 answer
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What is the meaning of the traction continuity condition in the generalized momentum balance (continuum mechanics)?

In Nonlinear Finite Elements for Continua and Structures by Belytschko and al. it is stated: As we have already noted, the strong form, or generalized momentum balance, consists of the momentum ...
Paolo Secchi's user avatar
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How position of c.g. affects car polar moment of inertia?

How position of c.g. affects polar moment of inertia for car in turn, why all racing cars have engine placed in the middle, has that something with polar moment of inertia?
user707264's user avatar
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How to calculate torque to rotate a object resting on four wheels

Can anyone help with calculation of torque to rotate a circular object which is resting on four wheels.. You can refer attached drawing for better understanding. Out of 4 wheels, two wheels are to ...
Sachin's user avatar
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Define material from Ogden–Holzapfel two-fiber strain-energy function in Ansys

I'm trying to do a FSI simulation with properties, described in this paper and for the structural properties, the authors use an Ogden–Holzapfel two-fiber strain-energy function to describe the solid ...
Laura's user avatar
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Stress Strain Analysis In Wall

I have a 20mm thick and 10m long wall. On one side of this wall (inner) is 80 degree celcius water, the outer side is air at an ambient temp of 20 degrees celcius. My coeff of thermal expansion is 15e-...
jude's user avatar
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What would be the Force Balance on this situation:

I'm struggling to find the correct Force balance in the following situation: The black parts are hard stopers. The blue part is moving perfectly aligned with the Y-axis in the negative direction. The ...
Bruno Fernandes's user avatar
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Circularity symbol with datum?

I am trying to interpret a technical drawing that has a datum attached to a circularity GD&T symbol. This page says that Circularity never has a datum reference. But this is a technical drawing ...
tar's user avatar
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How to achieve the choking condition at the orifice?

I have a geometry featuring two inlets. One inlet is designated for gaseous Ethylene, and the other is for gaseous Oxygen. During my computational analysis, I am unable to incorporate the complete ...
Mohammed Niyasdeen's user avatar
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Pump Head Requirement in dividing flow

I'll preface this by saying that I'm looking for kind of a simple answer, and will be providing almost all the initial conditions that I'm aware of. I have a single pump, which is to provide 80 m³/h. ...
Sen's user avatar
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What pressure sensor and how should it be installed on to the medical ventilator to get the pressure flow graph?

I'm currently building a project named camshaft mechanism medical ventilator. One of the objective of my project is to get the pressure flow graph from my user. I succesfully build my camshaft. ...
brian's user avatar
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Designing a mechanism for moving a tank in circular motion [closed]

Thanks everyone. For a university proyect of fluid mechanics we have designed a device that rotates a tank separating the movements for both axis in the horizontal and vertical one using leadscrews....
Iñigo Zarate's user avatar
2 votes
0 answers
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Textbook recommendation for how rain works for a mechanical engineer? [closed]

I am looking to find a textbook or even a paper that describes to me how rainfall works. What is the droplet size distribution, how dense are droplets packed, what incident angles do they hit the ...
thephysicsguy's user avatar
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1 answer
60 views

Why is friction problematic on small mechanisms with multiple parts?

This recent video concerns scaling down a nerf gun. Apparently a major problem (mentioned at 2:46) is the fact that friction "multiplies exponentially". Can someone explain more precisely ...
Benjamin Wang's user avatar
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Heat needed to prevent freezing of valve expanding compressed air

I am designing a system that is constantly flowing compressed air through a valve which is open to the atmosphere. I would like to size a heater to keep the valve at a constant temperature and prevent ...
charlp's user avatar
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Motor for a sukkah rooflight

im designing a motor for a roof light but will need to be disengaged from the motor and be able to open and close without any electricity. any ideas would be greatly appreciated
william's user avatar
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How to convert the Differential pressure in Pa to flow rate?

I am using SDP32 sensor and got the differential pressure value of the air. I want to convert this value to flow rate. What is the equation for that?
Rim's user avatar
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Ratio of length to baseplate bolt pattern to assume that a joint is pinned

I have a truss tower that is attached to a hoist arm by a baseplate. The truss tower is 80ft long and the bolt pattern of the baseplate is a 1ftx1ft square. Is it valid to assume that the joint ...
Nachiket Adhvaryu's user avatar
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Rotation of a tube

See image... why is it that in part 1 the answer is negative but in part 2 it is added instead of subtracted? I thought because I got a negative in part 1 I would have to subtract in part 2 but the ...
user22718620's user avatar
1 vote
1 answer
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Why are double-acting reciproating compressors more efficient than single-acting ones?

On many websites, I read that double-acting reciprocating compressors are more efficient than single-acting compressors. These sources say it's because they complete two compression cycles on each ...
Daniel's user avatar
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Auxiliary View to Isometric Projection (3D)

I'm having a hard time to visualize this Auxiliary View into Isometric Projection or the 3D version, my friend said that it shape like a hinge, but I stil could not visualize it, can anyone help me?
aki's user avatar
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Fluid dyanmic - flow in a pipe

Dear fellow engineers, I have a question regarding a fluid dynamic problem which I have sketched out. The initial fluid velocity is 1.5 m/s at 1.5 bar and the fluid is water. The pipe line has a ...
Dfhaa_DK's user avatar
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Rectangular pressure vessel

I'm trying to find a theory reference for stress and deformation analysis of a closed rectangular pressure vessels with constant thickness subjected to pressure loads. By now, my test case would be ...
Enrico's user avatar
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Power and energy usage monitoring for Vechical Control Unit (VCU)

I'm working on a project for an EV (electric vehicle) and I'm working on the VCU. I think the task that was given to me is to get all the data from a transformer or a DAQ (Data acquisition system) and ...
JOE BOB's user avatar
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1 answer
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Virtual work of two forces, how do you know whether they are in the same direction?

L.S. Currently for my course in Continuum Mechanics, I am asked to calculate the force potential in the configuration as shown in the picture. First I will introduce the full problem, then show my ...
Alex Remstedt's user avatar

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