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.

639 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
1
vote
0answers
33 views

Design of fan pipe for propelling glitter

I am trying to create a prototype for a glitter shooting mechanism. It is worth mentioning that I have no experience with mechanical engineering or fluid dynamics. I think the below image describes ...
1
vote
0answers
1k views

How to calculate the flow rate of a gas through a pipe?

I am trying to calculate the flow rate of Nitrogen through a cylindrical pipe. I only need a ballpark value, and the only information I have is the inlet pressure as 15 psig (assuming the same ...
1
vote
0answers
46 views

I need a mechanism/method to control a shaft that can rotate at different speeds. (faster clockwise and slower anti-clockwise)

I need to develop a mechanism - Where in I have a shaft that needs to rotate at different speeds. Lets say at a higher RPM clockwise and a lower RPM anti-clockwise. This shaft is attached to my ...
1
vote
0answers
152 views

Electronic Pressure Control, EPC

In short, the question is: How the EPC affects an automatic transmission? I'm planning to build an automatic transmission controller module, TCM for 4F27E Ford transmission. So far I haven't found an ...
1
vote
0answers
20 views

Basic dimension relationships in a valveless pulsejet engine

I'm willing to take my own shot at the construction of a blast supercharged valveless pulsejet, a holy grail among DIY jet enthusiasts. However, since my idea is not very compatible with the geometry ...
1
vote
1answer
65 views

Inefficiency of intermittent burn in rockets

Imagine I have a combustion chamber with a nozzle. There is a high pressure oxygen bottle and a high pressure gaseous fuel bottle connected to the chamber. Would the fuel efficiency be lower if I ...
1
vote
0answers
48 views

Design compensator to improve yaw rate control performance for aircraft

I am trying to design a compensator to improve the yaw rate ($\dot{r}$) control performance of an aircraft. The lateral dynamics for this aircraft is given in steady space form as following: where A (...
1
vote
0answers
40 views

How can we dissipate the heat from a block of 10*10*3 mm with 100 degree Celsius without losing the portability of the block?

I have a Peltier's device of 10*10*3mm and the material is Bismuth Telluride. The hot side is 100 $^oC$ and I want to dissipate the heat, and at the same time, the device should be portable i.e. it ...
1
vote
0answers
30 views

Pressing shaft into bore or bearing?

Curious as to what extent a shaft/pin will will follow a bore when being pressed in. Considering fixturing for a project to hold a shaft straight, but most of what I have seen, the shaft will self ...
1
vote
0answers
36 views

Solidworks static simulation having issues

I've got everything set. Material is aluminum alloy 6061. I've set the component contacts to no penetration. I have a contact set where both blocks meet and keep getting the same error. The bottom ...
1
vote
0answers
46 views

Extracting load info on Abaqus with Python

I have a model on Abaqus that I've managed to run some 85 jobs on manually. Between jobs, only the loads vary, and I select these loads by resuming what I need and suppressing what I don't with my ...
1
vote
0answers
75 views

The optical encoder resolution

The optical encoder has a code wheel with a single track of slots and two photodetectors. The photodetectors are positioned so that they produce signals with a 90 degree phase difference. I want to ...
1
vote
0answers
14 views

Does the air cushion on which the original hyperloop will sit require energy constantly or not

Does the air cushion on which the original hyperloop idea envisioned by Elon Musk require energy constantly to keep afloat, as the hovercraft does or would it be designed as the modern air suspension ...
1
vote
0answers
38 views

How to calculate load on roller to create given deflection?

I am trying to calculate what loading on a fixed roller will create a predetermined maximum deflection. I ran some calculations, but the values I'm getting are significantly lower than I would expect. ...
1
vote
0answers
35 views

What is the difference between $K$ ,$K_{IC}$ and $K_t$?

I have seen three representation of stress concentration factor values $K$,$K_{IC}$ and $K_t$ now all that I know is $_I$ in suffix represents opening mode of crack.The suffix $t$ stands for tip....
1
vote
0answers
30 views

gear design.improving gear strength

For improving the gear strength, which one is better based on manufacture and economy? Increasing module or increasing N? With the same surface strength.
1
vote
0answers
52 views

Does there exist a device which can construct a perfect parabola?

For instance, a compass can create a perfect circle, and two pins can be used to create an ellipse. Devices such as Spirographs can also be used to draw all sorts of continuous parametric curves. Is ...
1
vote
0answers
26 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 ...
1
vote
0answers
12 views

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 ...
1
vote
0answers
35 views

Heat sink Design

I have a problem where there is an 80 Watt thermal load that needs to be cooled to maintain 80 Celsius. The base of the heat sink is 5" x 7" and is oriented vertically with cooling via natural ...
1
vote
0answers
29 views

What is the smallest size of pipe to which I can Weld a 1 inch pipe Perpendicular to the Axis?

I would to know what is (or how to calculate) the size (dia) if the smallest pipe to which I can weld a 1 inch pipe from the side of the bigger pipe perpendicular to its axis (like a tee).
1
vote
1answer
84 views

How to compute the size of a polygon moving along non-circular guide rails

I am trying to compute the optimal (a non-optimal solution would also work) size of carts that can move along guiding rails. Each cart is connected to the rails at two points. Each cart is also ...
1
vote
0answers
564 views

Is it possible to calculate torque using strain gauges on a rotating shaft?

I am currently designing a torque sensor and am looking into the ability to use strain gauges as a instrument to measure strain and calculate torque. The current setup is two motors connected via a ...
1
vote
0answers
17 views

motion gesture and axis definition

I read something about defining hand gesture, which include mid-air hand gesture (e.g a peace sign with the two fingers moving one after another), touch-based gesture (e.g. on touch screen), and ...
1
vote
0answers
42 views

Deciding between Electric or Hydraulic Actuators for a Dynamic Load of around 4 kN to 6 kN

This is a project regarding linear actuators for a 4 Wheeled Robot, with spider like hinged legs. The first question on my mind was to figure out is if a hydraulic system has any weight to Force(...
1
vote
0answers
34 views

Solenoid stroke limits

Im new to rotary solenoids and I had like to understand the definition of stroke. For example, some rotary solenoid has in its technical information a parameter called stroke options and it says 25-...
1
vote
0answers
42 views

Fusion 360: Measurement issues to Slicer Software

So I made a design for the Autodesk Competition but for some reason, I have never had this issue, but when I export to .obj and open in S3D, it doesn't convert the measurements. My meaning: I have a 3....
1
vote
0answers
52 views

Heat Transfer in A Cylinder of an Internal Combustion Engine

I am new in engineering, could anyone explain the approach to calculate the max heat generation, the heat transfer from the cylinder to the atmosphere and from cylinder to the piston. I am also ...
1
vote
0answers
26 views

Steel Worm/Steel Wheel vs Steel Worm/Bronze Wheel

I have a question regarding worm drives, specifically double-enveloping types: Do steel worm/steel wheel combinations last longer than steel worm/bronze wheel or steel worm/brass wheel combinations? ...
1
vote
2answers
167 views

Should I use shaft or hole basis on a constant diameter shaft with both clearance and interference fits?

I'm looking to manufacture some steel pins and plates, with a view to large scale production in the future. One of the pins of the design has a constant diameter. This pin passes through holes in two ...
1
vote
0answers
66 views

Distance travelled at articulation point of turning vehicle

Problem outline: I'm trying to figure out the distance travelled at the articulation point of a turning vehicle with 4 driven wheels (each wheel houses a motor and can all rotate at different RPMs). ...
1
vote
0answers
52 views

Enthalpy vs Heat

If we have a closed cylinder filled with a gas and we heat it, by $1^{st}$ law we have: $\Delta q=\Delta U$ (?) since $\Delta V$ = 0. But $\Delta H= \Delta U+ V. \Delta P$. What does that difference ...
1
vote
1answer
90 views

Effect of friction (or horizontal motion) on vertical surface deformation

I am trying to model the dynamics of some system. In summary, the system consists of one horizontal linear actuator that drives an object along a planar surface and one vertical actuator that brings ...
1
vote
1answer
57 views

How do you calculate the chain tension required when compressing bulk material over a conveyor?

Bulk material is conveyed over a slat conveyor, and the material is leveled with overhead rollers while being transported in the conveyor to maintain an even material height. Most of these "levelers" ...
1
vote
0answers
149 views

Best spout shape to ensure minimal water sticks after pouring?

I have a tipping bucket rain gauge whose accuracy I feel could be improved by redesigning the shape of the bucket lip. In particular, after tipping, there tends to be a bead of water (approx 0.1 - 0....
1
vote
3answers
202 views

Honeycomb structures vs shear stress

Honeycomb structures are made of top and bottom shells and honeycomb geometry at core. In terms of bending load, maximun normal strains take place on top and bottom hence, sheet parts can support them ...
1
vote
0answers
259 views

ANSYS Fluent - Using Patch to set initial conditions, should I set the pressure and velocity or only one property to generate shock waves in a pipe?

I am fairly new to CFD and I am working in ANSYS Fluent. I am trying to model two specific shock waves in opposite directions in a length pipe. The shock waves need to be traveling at specific Mach ...
1
vote
0answers
87 views

How to attach a wheel to a turning axle for a ball machine

I'm trying to make a DIY tennis ball machine. However, I'm not quite sure how to attach the wheels to the steel rods, which will be attached to the motors. In other words, the wheel and the rod should ...
1
vote
0answers
39 views

Decision criterion if bolted joints are loaded concentrically or eccentrically

When dimensioning bolts I have to decide if the applied load is concentrically or eccentrically to the bolt axis (according to VDI 2230 but I think in other approaches too). But how do I decide and ...
1
vote
0answers
648 views

Derivation of Bimetallic Strip Stress in Roark's Formulas

I am trying to understand some analytic expressions given in the handbook Roark's Formulas for Stress and Strain for bimetallic strip stresses. Namely, Roark's Formulas give the formulas $$\text{...
1
vote
0answers
116 views

Equations of motion for a motor supported by a spring resting at the centre of a beam

Assumptions from this: Sum of forces on the beam to be calculated Sum of moments on the beam to be calculated Sum of forces on the motor to be calculated As: F=-kx = kθL^2 Equations of Motion ...
1
vote
0answers
30 views

Differential equations strange 2 DOF systems

I'm trying to find state-space representation of following 2DOF systems. I tried classic Double pendulum equations for it but I'...
1
vote
0answers
52 views

Rube Goldberg, twisting in a lightbulb

For my rube golberg project I have to twist a lightbulb in and have it turn on. I have seen different videos on how they do it but they never explain it and most of the videos are blurry. We can't ...
1
vote
0answers
157 views

Question about how to couple round servo shaft to flat shaft

I'm looking to control a commercial deadbolt using a small servo, motor, or gear motor. The deadbolt has a common Schlage cylinder such as this one that has a flat shaft that runs through a slotted ...
1
vote
0answers
46 views

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 ...
1
vote
0answers
37 views

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 ...
1
vote
0answers
103 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 ...
1
vote
0answers
38 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?
1
vote
0answers
35 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....
1
vote
0answers
27 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 ...

1
3 4
5
6 7
13