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.
4,253
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Looking for bolt with press nut
I'm looking for a bolt without a thread that I can attach to an object using a kind of press nut. Whats the name of these kind of bolts and nuts? Can't find any information about it?
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Please see image and calculate for combined stress and deformation
This image is from an assignment
I am struggling with this question. help would be much appreciated
The cross section of the I-beams truss structure is 0.0031771m².
The forces from left to right are, ...
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How can I determine the best thicknesses of a circular plate to achieve minimum weight and high strength?
I want to design a circular plate made from iron ductile material, So I want to determine the best thicknesses of the profile (t1,t2,t3,...etc) as shown in the image tyo achieve the best plate weight ...
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What would be the consequence of operating a mechanical transmission at low temperatures
Is there any risk of mechanical failure or other detriments resulting from running a mechanical transmission at low temperatures?
The transmission in question is connected to the vehicle's coolant ...
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What is the recommended Nylon washer thickness, OD and ID for M2.5 screws?
I am using two different M2.5 screws. One has head of diameter 4.5mm and the other has a head diameter of 4.75mm. If I want to use Nylon washer to distribute the load evenly, what is the recommended ...
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ASTM B209 does not list Aluminium Alloy 1070
This is my first post.
We manufacture products using various grades or alloys of Aluminium sheet, one of our common alloys is 1070. In referencing the ASTM B209/209M-21a standard I do not see 1070 ...
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How would I calculate combined stress analytically
The cross sectional area is 0.0031771 metres squared.
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What is the difference between maximum principal strain and maximum in-plane principal strain?
For the purpose of answering/explaining this, it does not need to be restricted to strains (i.e., it can be stresses too). I am mainly trying to understand when to use which one (i.e., if I am ...
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How to balance an irregular shape on a motor shaft?
I have an irregular shaped object about 100g in weight and 3x3x3 cm in size that I'd like to mount on a shaft (eg of a small motor) and spin. The trick is, I'd like it to be pretty close to perfectly ...
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Are there pressure vessels with hand inserts?
I'd like to work with some bike-tire parts while at moderate pressure (60 psi), so I'm hoping to use a pressure vessel, but it has to be transparent and have inserts so I can use my hands to ...
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Can the volume of fluid flow affect a strain gauge's measurement accuracy?
I have two machines for testing solenoids, one new and one old.
When a bypass is connected to both hoses (the input hose is connected to the output hose), I get ~1:1 for the input output pressure; the ...
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Deformation Due to Material Removal and Residual Stress
Suppose I have a piece of metal (of arbitrary geometry) with some residual stress profile. I then remove a chunk of the metal and the piece of metal deforms (due to the residual stress). For ...
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Checking if a Residual Stress Field Achieves Mechanical Equilibrium
Suppose I told you the Cauchy Stress Tensor at every point inside a chunk of metal. And, yes, I know this means that I would need to tell you about an infinite number of points - let's ignore that ...
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Connect two motors to different planes and rotate them on the same center point
I am trying to design a kinetic art sculpture. I want to rotate two independent planes at the same center point and control both their speed and direction independently. So I've found that having two ...
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One way bearings
I want to use one way bearings for a project, but there are some things I just can't figure out about them.
So I know that a one way bearing restricts rotation of an axle in one way and allows ...
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How to add compressor curve in Aspen HYSYS for a centrifugal compressor with IGV and only one efficiecy 65% is given in data sheet at 400rpm
I am trying to check the adequacy of existing centrifugal compressors in a gas train.
The adequacy check is required due to a new tie-in in an existing gas train inlet, from a new source of "...
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In a lead screw mechanism with a fixed travelling nut, will the screw and its driving mechanism move instead?
https://www.youtube.com/shorts/tUkkOStjz8o
Imagine this but upside down.
Since the platform bolted to the travelling nuts will be pressed against the ground and will have nowhere to go, I reckon the ...
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Impact on high frequency radial forces on ball bearings
Dear Stackexchange forum,
Do high frequency radial forces (e.g. 6kHz) do significantly increase wear and reduce the life span of ball bearings?
I am looking for an expert in ball bearing research ...
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Will a lid hovering above bursting air bubbles catch smog particles
The bubble bursting phenomenon goes like the above describes:
At 1, the air bubble is under water.
At 2, the bubble emerges above the surface, with a thin film of water rising to keep it from bursting....
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Continuous swinging machine
I'm making art piece that is hanging from roof and I would like to have it in continuous swinging motion. What kind of mechanism could be used in this case?
info about the art piece
about 16kg
shape ...
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Is there a way to add a DIY knock sensor to an engine?
I have a Rotax 914, a type of aircraft engine which is basically a 1980s turbocharged carbureted 4-cylinder boxer. There is no knock sensor, but considering the absolute devastation that detonation ...
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Metal casting simulation and the solidification analysis
Casting process analysis
Mold filling affects the quality of a casting. The fluid flow phenomena are closely related to the casting quality and surface finish. The dimensional accuracy of a casting ...
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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 ...
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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 ...
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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 ...
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27
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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 ...
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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 ...
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50
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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 ...
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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 ...
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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 (...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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?
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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?
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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, ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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