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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2answers
26 views

Why does the method of joints not match a force balance result?

I am trying to figure out why the two approaches do not match in solving this statics problem. This involves the image below. The first thing to do is to find the reactions at A and E. This is easy ...
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2answers
26 views

Moving a Bushing in Circular Motion

I am trying to design some way of making a bushing move in a circle. Specifically, I want the center of the bushing to draw out a trajectory that is a 3" diameter circle. I do not want the ...
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2answers
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For this drawing, is the front side view for this object supposed to be sectioned out or do you use only hidden lines instead?

For this drawing, is the front side view for this object supposed to be sectioned out or do you use only hidden lines instead ?
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1answer
29 views

Can carbohydrates in powdered form provide a more 'energy efficient' alternative solution to traditional combustion engines? [closed]

In my high school chemistry class I am studying the affect of surface area over the rate of reaction. In this case, using Collision Theory to describe how a high surface area to volume ratio ...
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1answer
43 views

Why different characteristic dimension for Biot Number and Fourier Number?

In unsteady heat conduction analysis, Biot Number and Fourier Number are given as follows: $$Bi=\frac{h L_c}{K}$$ $$Fo=\frac{\alpha t}{L_c^2}$$ where $L_c$ is the characteristic dimension or length ...
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Engineering Drawing Question: Draw the Whole Object. Draw the top plan. Draw the left view. Draw the section A-A all in third angle projection [closed]

Draw the Whole Object. Draw the top plan. Draw the left view. Draw the section A-A all in third angle projection.
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3answers
46 views

How to combine the power of two rods spinning at a different speed into one rod spinning at a combined speed?

I have two rods (that will be powered via something like two water wheels), and I need to combine their power so they both rotate the same rod. Sadly, they may spin at different speeds, and the ...
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0answers
17 views

Could you please let me know Tata Nexon car can turn in "L" shaped road with 10 feet road to 9 feet road [closed]

I am planning to buy Tata Nexon car, to park my car I have to go through "L" shaped road with 10 feet road to 9 feet road. Is it possible to go and park in this road.
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7answers
3k views

Why are multiple locomotives attached only to the front for larger trains?

For long freight trains and those that will be climbing to stations at higher altitudes, an extra or two locomotives are attached to the front. I've always wondered why. For argument's sake, if there ...
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2answers
35 views

Interpretation of dx/dt and u in CFD

I am currently studying CFD and I have a question about how I should interpret the term u and dx/dt. I would like to find that out in the textbook, but I could not. When I solve 1D Euler Equation with ...
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2answers
59 views

Stress-strain Curve Interpretation

A significant barrier to my understanding of typical engineering stress vs. engineering strain curves is that for certain values of stress, there are multiple values of strain (i.e., the stress-strain ...
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4answers
86 views

A problem on beams

Problem - I have interpreted "by hinging them together at B" as following - Now if this is the case, then applying a load on the right beam will have no effect, in my understanding, on ...
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0answers
32 views

Double Summation of Matrices in Convex Optimization in CVX

I want to implement the following optimization problem from the following paper Randomized Gossip Algorithms, Page 10 Eq. 53\ 1- In this problem, $W$, $P$, and $P_{ij}$ are $n\times{n}$ matrices. I ...
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2answers
73 views

Calculating Torque With a Second Arm Attached to the Main Arm

I am working on some code that will handle the arm of a robot, and I want to be able to hold the arm in place against the force of gravity. The arm is in 2 parts just like a human arm and I intend to ...
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1answer
63 views

Slope of the Bending moment diagram where a point force acts

Consider a beam that is arbitrarily loaded and at any distance x, we take an element in the beam between two sections, where a point force acts as shown. Let us assume the directions of shear force ...
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2answers
30 views

Weight of the beam not considered in Macaulays method

I'm currently writing a lab report following an experiment to compare the Theory of Macaulays method to the lab results. My query is, None of the lectures or teaching I received has considered the ...
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1answer
37 views

Which forces act on a circular drive without central rotation point?

Imagine a ring (here green) with a fixed position in space (blue axis is Z, up). On that ring, there is a device that consists of a rigid structure (here yellow), three presser rollers (here cyan) ...
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3answers
64 views

Why does the string having length C not have an impact on the overall system?

The Q: Given: a1 and a2 are the accelerations of mass 8 kg , 2 kg respectively. i) Total Length of Sting $L=4 x_{1}+2 x_{2}+C$ ii) $\frac{d L}{d t}=\frac{4 d\left(x_{1}\right)}{d t}+\frac{2 d\left(x_{...
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6answers
2k views

When a car with an open differential turns, why does the inner wheel slow down and the outer wheel speed up?

I asked this in the physics stack but hopefully will get more interest here. So I understand that when driving on a curved path, the inner wheel must travel a shorter distance than the outer wheel. ...
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5answers
147 views

How do I calculate surface area of dashboard through integration?

How can I calculate surface area of dashboard through integration. I traced the surface using pencil. I can calculate rough area but I want to calculate actual area through integration. The vertical ...
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1answer
63 views

Is there a mechanism that allows this kind of piston/plunger movement?

I am trying to create a prototype for a gravity energy storage system, and I need to release potential energy stored in a heavy load of mass M, raised to a height *H. I intend to use the mass ...
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2answers
43 views

Relationship between shear force and load intensity

The book I'm referring to for studying beams, said that its quite cumbersome to construct shear force and bending moment diagrams, by writing the SF and BM equations for each segment of the beam and ...
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3answers
20 views

Is it possible to construct geared speed and torque dials?

Say you have a very complex completely mechanical machine, and you want to put a dial indicating rotation speed of the central drive shaft and its torque. But the machine is completely mechanical, and ...
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0answers
34 views

Relationship between the infinity norm of estimation error and the trace of estimation error covariance matrix in Kalman filter

I am working on designing an interconnected distributed control system. In this system, I need to use Kalman filter because the measurements are noisy. I have two questions: 1 - What is the ...
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0answers
23 views

What GD&T methodology should I use to specify alignment of two holes perpendicular to a shaft?

A round shaft 120mm long has two holes; one 10 mm from the end, the second 80 mm from the end. Each hole is perpendicular to the shaft's length. And here's the problem: the center line of both holes ...
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0answers
38 views

Which method is suitable for manufacturing this small scale geometry?

I want to have a channel manufactured in the dimensions shown in the picture. Which method is suitable for it. I think CNC can not achieve to work in such small scale. That rectangular prisms with 1....
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0answers
44 views

Two motors to drive multiple shafts

I have multiple shafts I’d like to rotate independently and sequentially. I’m looking for a two motor solution - like a mechanical multiplexer - so one motor chooses the shaft and the second motor ...
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2answers
35 views

Question about cam follower design

It's always said that jerk function should be smooth to avoid undesired vibrations. What exactly is the vibration in a cam follower mechanism and why is it important to avoid it?
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3answers
39 views

Concentrated and Distributed loads in regards to moments

A load is any externally applied force or moment. A load which is spread over a very small area of the beam is called a concentrated load. A load which is spread over a significant area of the beam ...
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2answers
42 views

Is Smith Diagram and Modified Goodman Diagram the same? And how does one construct it?

I am confused about the names. Moreover, I haven't found any textbook which attempts to show step-by-step construction of these diagrams. I would be happy if anyone pointed to some textbooks or even ...
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1answer
35 views

What does a dual bearing motor mounting system look like?

I came across the following excerpt about how to mount wheels: The most robust system is the dual bearing system. In this, the wheel axle is mounted on two bearings and chain driven. This takes all ...
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1answer
36 views

Concerned about snow and dirt getting into the drive chain based on my design

I am working on building an autonomous snow thrower similar to the one in this video. I tore an old RX73 tractor down to just the chassis, by removing the engine, transmission, mower deck, brakes ... ...
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2answers
44 views

How do I add resistance to a ball joint?

I'm trying to make a simple design that consists of two ball joints connected to each other in such a way that I have rotation and translation of the second joint, but with an adjustable resistance. I'...
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2answers
75 views

Are these section views correct Autodesk inventor

So I used AutoDesk inventor and created this machine part for the purpose of exercise , But it is preferred to not to hatch ribs in my course so is there a way to make it look like image (5 and 6) ? ...
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1answer
32 views

What is meant by Solid Mesh and Surface Mesh? [closed]

Solid Mesh vs Surface Mesh, which method should I choose in simulation studies. What is the geometry behind these meshes. Which mesh gives accurate results?
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1answer
36 views

What is the name of this height-adjustment structure?

I'd want to build a scale which can be "locked" in order to prevent weight from being pressed in it. The scale and the weight are permanently fixed on a vehicle and I want to make sure it ...
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3answers
81 views

Difference between Stiffness (K) and Modulus of Elasticity (E)?

Stiffness (F=Kx) is the extent to which an object resists deformation in response to an applied force. Elastic Modulus (E=Stress/Strain) is a quantity that measures an object or substance's resistance ...
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2answers
75 views

What is this type of detent mechanism called?

I'm trying to find out what this common rotary detent mechanism is actually called. I see them in all sorts of cheap plastic toys, and I'd like to see if I can find them for sale, but I don't know ...
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2answers
30 views

Shear force in a beam at ends

Consider a cantilever beam acted upon by a point load at its free end. The shear force diagram is shown. I have a little doubt,is the shear force at x= 0 ,both 0 and $-W$ or just $-W$? Similarly at ...
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2answers
48 views

How can I find the right resonant frequency of a chassis?

Structures have infinite DOFs, so it possess infinite mode shapes. How can we find the right resonant frequency out of the infinite resonant frequencies so that we can save our structure? For example, ...
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2answers
104 views

Solving Timoshenko beam equation for cantilever beam

Update with solution Solution 1 Problem: Beam clamped at left side, free end on right side, point load pointing downwards. x is defined positive from the clamped end towards the free end. Create FBD ...
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1answer
50 views

Multiple vs single rocket engine nozzles [closed]

I am an aeronautical engineering student and at university with a group of friends we are are working on building a rocket aimed at getting past the Karman Line (boundary to space). We will be ...
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4answers
47 views

Can air currents be used to keep dust from settling on solar panels?

I've been trying to build products to start my own solar company. A common issue with solar panels is dust accumulation, which reduces the already low efficiency even further. I've been working on ...
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2answers
59 views

A query regarding constructing vacuum sealed vessels

The atmospheric pressure at the surface of the earth is about 101 $kPa$. For Carbon fiber reinforced plastic (70/30 fibre/matrix, unidirectional, along grain): Young's Modulus is: $181\ GPa$ Density -...
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1answer
32 views

Why is the direction of static friction towards centre in case of circular turning?

Here , a car turning on a circular track. I have marked all the kinds of friction , velocity happening in the diagram. For the front wheels , VT (Tangential velocity) ,Vr(Radial velocity) , VR(...
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2answers
63 views

A problem from Damped free Vibrations

Problem: I can understand the problem physically that the block is pulled by some amount X so that its displacement at t=0 is X. It is then released from that position so that its velocity at t=0 is ...
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1answer
27 views

What wire rope to use for a load-bearing telescoping lift, and how to secure it

I'm trying to find a thread that has good fatigue resistance and strength for a telescoping lift to be used in a robotics competition. The lift will lift a weight of around 2-3 kg. I do not intend to ...
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2answers
41 views

Why is direction of velocity in front direction

These are how circular turning tracks look like. Now , according to my textbook: This is how it looks like. But I argue upon each & every point of it. Here , the car is turning but it’s ...
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4answers
35 views

Derivation of static & kinetic friction formula

We know formula of static friction & kinetic friction = μsN and μkN. I have searched online a lot about them. I do know what is the formula & how to use it but I couldn’t find any article ...
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0answers
46 views

What else can you call an acme fitting?

Selling products on Amazon, I've had a listing pulled over "trademark violation" for mentioning that an HVAC sets come with acme fittings and/or acme adapters. a) Is there any way that this ...

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