Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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.

0
votes
0answers
21 views

How to design a coaxial 1:2 gear without reversing direction?

I am trying to design a gear that has a 1:2 speed ratio (input:output). This design is very limited in space and for simplicity and space savings requires the input and output shafts to be coaxial. ...
0
votes
1answer
13 views

What Is the Different Between Single Nipple, Double Nipple, and Pipe Nipple

I just work on the engineering company that specialize in water piping. I am confuse about the term of nipple. What is the different between Single Nipple, Double Nipple, and Pipe Nipple? Hope ...
0
votes
1answer
34 views

Is there a motor design where a rotor gradually moves into a stater?

I was wondering if there is a motor/generator design where the rotor moves gradually in and out of the stator along the axis of rotation, or the stator over the rotor. If so, I'd like some resource(s)...
0
votes
0answers
16 views

Using a rotational latch to restrain an object under a horizontal force

So hypothetically, I'd like a to build a latching system to prevent a steel block experiencing a horizontal force from moving until another upwards force releases a latch, at which point it would ...
0
votes
0answers
16 views

About method of work and Energy or Clapeyron theorem

I'm having some difficulty to understand the work and Energy method (aka Clapeyron theorem), especially with different loads. Could you please help me to fix this problem, because I found different ...
0
votes
1answer
14 views

Which mounting bracket to use with a geared box?

Which 90 degree bracket would you use for this one? Do you have any suggestions for what i should be looking for, I find it very hard to find something. It is 5cm between all the outer holes. Would ...
0
votes
1answer
25 views

Deflection of Rectangular Plate with 2 Simply Supported Edges

As shown in the figure provided, a Uniform load acts upon a rectangular plate with edges at Y = 0 and Y = b which are simply supported. Using this form of the Plate Equation: $\frac{\partial^4 \...
0
votes
1answer
30 views

Pump Characteristic Curve

I am bit confused about the curve: We could observe from the [Pump curve] that Total Head decreases with increase in flow rate, but for [System Curve], it is opposite, i.e, Total Head increases with ...
0
votes
2answers
20 views

Why does a lead-compensator type system decrease to a step response

For example, the step response of $\frac{s+1}{s+2}$ is decreasing although its gain is +1, and this system has higher gain at high frequencies than low frequencies based on its Bode plot. But if I ...
3
votes
2answers
97 views

Why do 2-stroke engines burn more oil?

Of course, most 2-stroke engines require oil to be mixed with the fuel (I appreciate there are 2-stroke engines that don't require this). Therefore, it makes sense to me that oil will be burnt during ...
0
votes
0answers
18 views

How to keep lighting “barn doors” open

I have two alum plates (45cm x 20cm x 1mm) that are hinged on the long side with two 30 x 80 hinges (30 x 40 each tang) in the middle, and "L" bracket / 20mm brace at the ends secured with a M4 loc ...
1
vote
2answers
14 views

Gasturbine energy balance

I have a question regarding gasturbine energy balance, the total energy that flows into the gasturbine is given 12 MW and the power needed for the compressor is 4.4 MW and the turbine power is 9.3 MW....
1
vote
1answer
32 views

Magnetic treatment of hard water to prevent scale and corrosion? How does this work?

I ran across this company at their booth at a Tradeshow (2018). They claim to have a chemical free (and as far as I can tell - a power free) treatment method for hard water to minimize scale and ...
0
votes
0answers
10 views

Double-shot molding, over-molding and insert molding?

I would like to have a transparent glass (or plexiglass) molded together within an ABS part. What are the drawbacks/advantages and also design constraints of the following injection processes? -1. ...
0
votes
1answer
36 views

What is the appropriate type of controller for this system?

I am given this transfer function for a system: $T\left(s\right)=\frac{9.81}{s^4+0.5s^3+11.2815s^2+4.905s}$ Now, I want to design a controller that will make the closed loop system have an overshoot ...
0
votes
0answers
26 views

Flow Simulation for Laminar Flow in Annular Gap?

Would anyone be able to run an air flow simulation through the following geometry at 100 cc/min? I'm curious if any dead spots occur and if the geometry of the annular gap will produce laminar flow. ...
-1
votes
1answer
53 views

Device with no moving parts to increase fluid pressure?

I'm currently designing an air rifle and am looking for ways to increase projectile velocity without resorting to combustion, modifying the projectile, barrel length or changing max pressure within ...
0
votes
2answers
46 views

4-stroke vs. 2-stroke rpm

Of course, this is not true for all engines (after all the pre-2014 F1 engines were 4-stroke and were rpm limited to 18,000 rpm). However, from my experience, 2-stroke engines tend to run at a higher ...
0
votes
0answers
18 views

Use of Absolute vs. Differential Pressure Transducers to Calculate Flow Through Annular Restriction

If using a laminar flow element, in conjunction with Poiseuille's equation, to calculate mass and volumetric flow rate, what would the benefit be to using two absolute pressure transducers to measure ...
0
votes
0answers
39 views

Finding the right worm gear for a wormscrew that didn't come with technical specs

I bought a CNC linear rail guide slide from ebay(seen here). I'm trying to find a proper worm gear to mate with the wormscrew. There is no technical specification that came with the kit however on the ...
1
vote
2answers
48 views

Statics Distributed load question

Determine: the distributed load $w_0$ at the end of D of the beam for which the reaction at B is zero the corresponding reaction at C. Please show me how to get the right answer to this question.: ...
0
votes
0answers
19 views

Can you use a flex (spider) coupler as a dog clutch in a motorbike/atv/go kart/lawn mower like setting?

My question is simple: I want to make a dog clutch system for a wakeboarding cable system and was wondering if a flex (spider) coupler could used? The power, velocity, torque is similar to a go kart /...
0
votes
0answers
42 views

Position of Spring to support Vibrating feeder

So I have to design a vibrating feeder of 55kg which moves the material (light objects eg. olives) on it in forward direction (linear motion). I am stucked on the positon of the spring. I mean which ...
0
votes
1answer
32 views

Help with determining the dimension change in the xyz direction of a component under a load?

I'm stuck on this question. I got the first part right which is to work out the dimension change in the x direction but I got the y and z directions wrong. I had to submit this online and it doesn't ...
0
votes
0answers
23 views

Static balancing of link mechanism

So I'm trying to get to the condition as shown in the picture below, where it says that if we have zero free length springs and k1r2=k2r1, then any configuration (pose) of the link is in equilibrium. ...
0
votes
0answers
12 views

calculating pressure in siphon pipe

I've been posed the following question and I am stuck on the final part, part(c). A diagram of the problem is: I was able to complete part (a) and (b) okay, using the mechanical energy equation with ...
0
votes
0answers
31 views

Finite Element Code: Convergence issues

I am trying to code a simple FEM problem. A bar is fixed at the bottom edge, and a displacement is applied at the top. I want to apply the displacement gradually , so I have divided it into a number ...
0
votes
0answers
9 views

Can I power a small vehicle with a gamma Stirling engine and hot water?

This amazon page shows a small vehicle powered by a Stirling engine where an open flame heats the hot cylinder. I am interested in a child-friendly version with a gamma Stirling engine and hot water, ...
0
votes
1answer
28 views

Angular acceleration and the moment of inertia

The wheel is made from a 10-kg thin ring and four 0,5-kg slender rods. If the torsinal spring attached to the wheel's center has a stiffnes $ k = 2 N*m/rad$, so that the torque on the center of the ...
0
votes
0answers
25 views

Is it possible to mechanically switch between rotational directions of an output shaft?

I know that it would not be possible while the input is still rotating, but is it possible to create a gear box or chain assembly that can change the direction of rotation?
0
votes
1answer
51 views

Is it a Lever Or Not?

I will try to lift up 25kg (50 pounds)(electrical child car) on a linear actuator and I know that there would be a 30cm long lever. But my question is if there will be some lever. I think it won´t ...
0
votes
0answers
11 views

What pressure value to use for Poiseuille's equation?

If using a mass flow meter with a annular gap to produce laminar flow and the reading across the restriction is 871 Pa, is this the correct value to use for dP in the Poiseuille equation? Or must that ...
0
votes
1answer
43 views

Calculating the Surface Temperature of a Cable with known heat flow

I have a cable which dissipates $\dot Q_{total}$ and I need to determine the surface temperature of the insulation $T_{ins}$ and the surface temperature of the conductor $T_{cond}$. There is an ...
0
votes
0answers
9 views

Newton Euler Formulation for open chain prismatic-revolute-prismatic manipulator

I am new to using Newton Euler method for modeling dynamics and was wondering if anyone could clear something up for me. The manipulator I'm trying to model is a PRP open chain robot like in the ...
0
votes
1answer
40 views

Fluid Mechanic Buoyancy problem. How to determine the height?

I tried to solve it but I don't know how to bring the Area A in this equation. I used the area of the small vessel, but this one shouldn't be in the equation. Thanks a lot
2
votes
0answers
20 views

Eulerian description of fluid flow

In Eulerian description of fluid flow, we observe how the properties of the fluid are changing at a point. Since a point has zero dimension hence a zero area, how can we make sense of the 'finite ...
0
votes
1answer
46 views

Singularity function

Could you please tell me why the singularity function is one when x=0 I mean $<0> ^0=1$ Thanks you in advance
0
votes
0answers
25 views

Stopping a tall structure from being blown away by a strong wind [duplicate]

I have a 1.5-meter satellite dish, and I wish to have it point directly upwards. Here is what the dish looks like with the feed in place (ignore the wobbliness of the feed, we increased its backplate ...
0
votes
0answers
24 views

Volumetric & Mass Flow Rate Through a Piston-Cylinder Annular Gap with Laminar Flow?

I am attempting to define the proper equations used to calculate both volumetric and mass flow (based on pressure differential) through a Laminar Flow Element. The element consists of a piston ...
0
votes
1answer
17 views

Measuring wire damage using strain gauges

We need to determine the physical damage in some area of overhead lines that can't be inspected visually. The damage's in general caused by short circuit and air pollution (mostly sulphur compound). ...
1
vote
2answers
59 views

Which design to maximize friction for a device standing on concrete?

I have a device 4cm X 5cm X 15cm that stands on asphalt/concrete/road. So, the device is taller than its base which makes contact with the asphalt. I want to maximize the friction so that the device ...
0
votes
1answer
17 views

How can I calculate the discharge flow rate of compressor of 1 HP?

Outlet nozzle - 1 1/4 inch Cut off pressure - 8 bar Tank capacity - 35 ltrs How can I calculate the discharge flow rate? Based on the outlet nozzle, discharge rate will vary.
1
vote
0answers
18 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). ...
0
votes
1answer
32 views

Air conditioner using liquid nitrogen and a cryogenic heat exchanger

I have been trying to understand if compressor-based systems in air conditioners can be replaced to make something more economical and energy efficient. From what I understand, the compressors ...
1
vote
0answers
37 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 ...
0
votes
0answers
13 views

Entrainers to distill MTBE from Methanol? - Chemical Engineering Question

What have you found to be some effective entrainers to distill MTBE from Methanol, given the azeotropic conditions at 67%. I have tried to simulate 1-butanol, as well as ethanol, and numerous other ...
0
votes
2answers
117 views

Statically indeterminate fixed-pinned beam problem

F=32KN; Mf1=60KN-m; Mf2=-58KN-m; g=30KN/m I need to solve this using Force method. Find the reaction at the pinned end.
1
vote
1answer
30 views

When calculating the deformed radius of a pressurized thick-walled cylinder, why is the hoop strain used rather than the radial strain?

The context I’ve taken an interest in the design of pressure vessels for use in submarine applications. From a cursory survey of what is used in industry, it seems the de facto standard housing is a ...
0
votes
1answer
16 views

Rotate rack while keeping it engaged with gears

I am trying to design and construct a working replica aircraft instrument (a Horizontal Situation Indicator to be exact) but am facing a couple of issues. The first one can best be demonstrated with ...
0
votes
0answers
16 views

Analyse Soldiworks 2018 Files

we currently need some help in analyzing the real (!) content of our design files of Solidworks 2018. Recently we are faced with ghost-parts within our assembly files. Unfortunately, support is not ...