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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2k views

Retarding Force [closed]

I need help with the following question: A pile-driver has a hammer mass of 1000 kg which is dropped onto a pile from a height of 5 meters. The pile is driven 0.5 meters into the ground. The pile has ...
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1answer
49 views

Need help to understand why something tips over and how to prevent it [closed]

I am designing a television stand for 55 inch television that weighs 24 kilograms. Now, i have made a stand and attached it to the back of the television. Now, what should be the weight of the stand ...
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1answer
527 views

Disadvantages of wire cut cnc edm

Before purchasing Wire cut cnc edm I just wants to know about disadvantages of it over using mechanical lathe machine.
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1answer
25 views

Improving efficiency in automobileIC Engines [closed]

I think that the varying load in roads affect the efficiency of IC engines in large amounts. I am planning to do a mechanism which stores the power produced in IC engines mechanically, and then ...
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1answer
54 views

Can a mechanic pull apart a strong bolt by hand power alone with an ordinary wrench? [closed]

I am wondering whether a typical mechanic can break a bolt using a wrench. For example, let's say the wrench is 15" long and the force is applied at a radius of 13". The mechanic applies a force of ...
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2answers
71 views

Can we use Gravitation Force for Generation of Free electricity? [closed]

How we can generate free electricity constantly? with the help of magnetic field we can generate free electricity but its amount is very less, also with the help of eccentric load we can generate free ...
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1answer
91 views

Need motion equations for falling ball for simulating

I am currently MS student in artificial intelligence (AI) and working on my thesis on reinforcement learning, which robot should learn by itself how to control a quadcopter. Long story short, I have ...
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1answer
71 views

Are tires of a soprts car small in size for low ground clearance? [closed]

since the ground clearance of a sports car is low. Do we use small tires for them?
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1answer
1k views

How is the mass of air in the intake manifold calculated in an electronically fuel injected vehicle?

I am considering a two wheeler petrol engine. How is the mass of air entering the intake manifold calculated? Given that I have: Manifold Absolute Pressure sensor Intake Air Tmperature sensor ...
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1answer
199 views

Pivot Point Equations [closed]

Assume we have a platform fixed to a pivot point: We use 2 rods, either side of the pivot point, but at different distances from it. If we were to lift ROD 1 by a certain amount, how much would ROD ...
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0answers
37 views

The Hydrolock - How to build a deep sea docking system?

How do you build a docking system at deep sea pressures? Example a Challenger Deep Sea Base at 10,000 meters seawater or approximately 1,000 atmospheres? My answer below is meant to be a logic-model, ...
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1answer
143 views

Head loss for T junction diverging water pipes

I am writing to ask for help with a T-junction pipe problem. Attached picture shows the pipe configuration. The schematic shows a large pipe with ID 16.5mm and smaller 4mm ID tubes connected to it. ...
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1answer
148 views

Velocity inlet boundary condition in Ansys Fluent

Ansys Fluent offers a very simplified version of boundary conditions. So if I know the velocity at the inlet, I need not care about pressure and vice versa. What I am having trouble with is that I ...
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1answer
46 views

Rajay 300B Compressor Map

Question about the 40K speed line. What is happening when it drops off to the right? It starts around 60 CFM 1.2 pressure ratio and then drops to 1.0 pressure ratio at around 250 CFM. Are they ...
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4answers
50 views

Does the torque on gear varies with different gear arrangements?

Suppose that there is a gearbox with gear ratio 3000:3. The gear with 3000 rpm will have a smaller torque than the 3 rpm gear. My question is that will for different gear arrangement(i.e planetary ...
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1answer
43 views

Not too sure how to approach this equation - fluids mechanics

Apologies if anything has been left out. Ok, so there is just 1 equation which I am struggling to understand, I have made an attempt and also written out the full equation in 2 parts, but I dont know ...
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1answer
43 views

As a rugged and waterproof device, how does gopro dissipate heat?

I am new to designing rugged + waterproof products. I am curious about how to dissipate heat when the electronics are running and the ambient environment is even hotter. It seems like the mode of heat ...
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1answer
33 views

How to connect the rings to the coil

Hello I was recently watching this video and I have 1 question the video doesn't explains.It says that when the coil will start rotating the rings will start rotating as well. But how do I connect ...
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1answer
54 views

Length of semi major axis for the ellipse in “Total Strain Energy theory”

The equation describing the "Total Strain Energy Theory" (Haigh & Beltrami's Theory of failure) is given as follows: $$σ_1 + σ_2 - 2μ σ_1 σ_2 ≤ (Syt)^2$$ where $σ_1$ and $σ_2$ are ...
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1answer
51 views

How to calculate riser dimensions given cast material and cast dimensions?

I tried to calculate the dimensions of a cylindrical riser with height and diameter being the same ,for casting a steel cube,I tried using both Caine's and modulus method to solve it ,but every ...
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1answer
30 views

Can we coat brass with nickel by peen (mechanical) plating?

Is it possible to plate brass conductor with aluminum by peen plating?
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1answer
43 views

Stress Analysis University Report Help

I'm working on a final report for the mechanics of material course, and the project was to choose a structure or mechanical element and carry out stress analysis using solidworks and then confirm ...
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1answer
125 views

How would you go about calculating the force required for an actuator to lift a bridge?

I have been trying to come up with the optimal way to calculate the force required for an actuator to be able to lift a bridge 90 degrees. (A drawbridge) The actuator is placed as follows: (The bridge ...
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1answer
35 views

Please check the front,top and left hand side view of my figure

Below is the link what I have tried Please check if it is correct or not?
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1answer
38 views

Method of joints not working on simple truss, supposed to be stable and determinant

In the process of editing the question to put better pictures of my dimensions in, I realized that how I calculated my angles was incorrect, and that is why my answers were yielding inconsistent ...
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1answer
36 views

Torque Required for spinning tube

I'm trying to spec a stepper motor that would allow me to position a tube, as well as spin the tube continuously in either direction. Ideally at a maximum of 60rpm, but variable speed which be ideal. ...
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1answer
38 views

how to determine how much speed a motor will produce under load?

I am working on a one-wheel project, I would like to use an electric go kart motor chain driven to a 30 cm diameter wheel and get 90 kg at least 13 m/s with an acceleration of 3 m/s2, I ...
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2answers
63 views

Bending moment in Euler-Bernoulli finite Element

I'm trying to calculate the bending moment distribution on a fixed-fixed Euler-Bernoulli beam. It is known that interelement nodes show different values for the bending moment. What is customary to do ...
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1answer
37 views

Running single Peltier Module at high power vs running multiple peltier Modules at low power? Which is more efficient? [duplicate]

Please give calculation for peak power consumption wrt whichever is efficient.
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1answer
45 views

How to Calculate Torque to Prevent Rotating

I'm stuck with how to calculate the external torque which must be applied to prevent the aircraft rotating about axis? The imagine shows an aircraft which has a jet engine with a rotor that has an ...
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1answer
29 views

Problem for backwards moving vehicle in hills

The vehicle running at Hill station.. Same time vehicle moves back ward direction in manual transmission system. So avoid the problem.. I think ratchet pinion mechanism suitable! or not?
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1answer
24 views

How a turbo jet engine produces thrust

As i read on some website of nasa, that velocity of the gas flowing from nozzle of the jet is responsible for thrust, But ky confusion is that, as the velocity increases presure should drop at nozzle, ...
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1answer
47 views

Design suggestions for Mechanical rotating disc with 30 degrees step

I am a software engineer with no knowledge of mechanical engineering. I need to buy or build a rotating disc which can rotate in 30 degree steps only i.e each time I try to rotate it, it should take ...
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1answer
30 views

SINGLE supported beam

Let's say I have a beam supported exactly in the middle (like a seesaw) and a distributed force applied on it across the beam. What is the way to calculate the displacement, moment, shear...etc of the ...
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1answer
43 views

understanding required torque for a servo

Good morning. I have been reading the threads about "Understanding required torque for a motor lifting a weight" in hopes it would apply to my situation. I would like to utilize an R/C servo to rotate ...
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2answers
37 views

Does utilizing exhaust energy to supercharge (“turbocharging”) increase the thermal efficiency of a gasoline internal combustion engine?

The work done by a turbocharger increases the inlet charge without much of a burden to the exhaust flow. This increases the amount of air (and fuel) that flows into the engine. How does this affect ...
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2answers
37 views

Help me to park my car [duplicate]

My front gate is 13 feet wide and length is 20 feet and the road is 11 feet wide I have a Scorpio SUV can it be park in my house
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1answer
64 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 ...
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2answers
109 views

Why are rotary ramjets not replacing turbojets yet?

Rotary ramjet is an engine that uses ramjets attached to a shaft to allow them to operate at the supersonic speeds they require without the engine itself being in translational motion. The huge ...
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1answer
55 views

calculate number of cylinders and volume in a turboprop

I've been given the following: CL (lift coefficient) $\eta_p$ (efficiency of the propeller) $n_p$ (number of revolutions of the propeller) $n_e$ (number of revolutions of the engine) $\eta_g$ (...
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2answers
88 views

Impact capacity of tension cables, columns and foundations

A rock is falling from an embankment of mass $m_a$ at a height of $h$. Below, a fall protection fence catches the rock, dissipating the energy through tension cables to steel posts and then into ...
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1answer
232 views

Why using average pressure in calculations gives the most accurate results?

In the saga of trying to answer the question that came into my mind while studying the basic concepts of Fluid Mechanics, "Why textbooks use geometric center to calculate hydrostatic pressure when ...
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2answers
54 views

Move two discs freely and quickly on the underside of a surface? [closed]

The discs must remain in flat contact to the surface at all times but you can assume no friction while pushing them about. No using magnets from the other side of the surface, for all intensive ...
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2answers
189 views

Engineering mechanics(statics) [closed]

I don’t get how to get the answer to part e. Should we assume reactions at A and B in all three figures are same? If so, why?
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1answer
26 views

Backplane connector adapter

I have a backplane. A backplane is a PCB which more or less serves as a hub for other PCBs. The other PCBs connect to it through its "backplane connectors" and it routes the numerous quantity of ...
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1answer
52 views

What is the Thickness of JIS Standard Pipe

I work in engineering company that doing pipe installation. Just now our company got inquiry from Japanese company. They ask me to manufacture a pipe for exhaust ducting. The thing is they use ...
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2answers
71 views

Change of fluid of Pump

If the fluid moved by a pump is changed by another different one, what will be the effect of such kind of operation for the pump ? Specifically, a pump moving 60 m3/hr of "liquid nr. 1" (sp.grav.: 0....
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2answers
51 views

Net water pressure in pipes [duplicate]

Greeting, I have two pipes A ,B same diameter, joined to be one pipe C with double diameter of A , water flow in A with pressure 90bar and in B with pressure 40 bar . The question is how much ...
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1answer
125 views

Young engineer wanting to work in the industry: is PhD worth it? [closed]

I'll soon get my engineering diploma (~MSc, from a "renowned-but-not-in-the-top-3" so-called french grande école). The degree itself is not specialized, but I mainly studied mechanical and industrial ...
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1answer
72 views

Designing a simple measurement system [closed]

I am trying to get a better understanding of measurements and instrumentation before starting an online class next week. I have been reading a text book and came across a concept question I am stuck ...