Questions tagged [pistons]
The pistons tag has no usage guidance.
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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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Functioning of compression rings
I have just completed a university course in tribology, but have a question that pertains to real-life applications.
For pistons in combustion engines, the rings seal the combustion chamber from the ...
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Different connecting rod designs for diesel vs gasoline engines?
I've noticed that diesel engines tend to have rod caps that are installed at an angle as supposed to straight on gasoline engines.
This is an example of a generic diesel engine piston and this is an ...
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What are good materials to make an elastic and durable diaphragm, preferably with high stiffness?
What are good materials to make an elastic and durable diaphragm, preferably with high stiffness to make a diaphragm or membrane pump for gas? Operating temperature will be between 0 and 100 degrees ...
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Purpose of the piston ring in an engine
I am researching the design of engines and I noticed that most pistons have piston rings. My understanding is that the piston ring helps create a gas-tight seal.
Is the piston diameter machined to ...
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How to draw a pipe being moved between tanks? (ISO standard P&ID)
Where I work, we have a set-up that functionally, works as represented below:
I represented it as such, due to a lack of know-how in regards to the actual, ISO-standardized way of representing this ...
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Clarification of a piston and crank dynamics question
Yesterday, I had an Engineering Mechanics exam which involved a Piston and a Crankshaft engineering dynamics problem, which I was a bit stumped about. I sought clarification from the teaching staff ...
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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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What will be the force F for the given brake system?
I am getting two ways to find F. One is Fx0.2=30 Nm which gives F=150N Other is Fx0.2-640x0.13=0 which gives F=416N I am confused which one is incorrect. I know problem is too basic but still not ...
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Is there any mechanical engineering solution that employs 'ankling', as per a cyclist's ankle/foot/pedal setup?
A cyclist will have the pedal spindle somewhere under the front part of their foot, usually around or just behind the ball of the foot. This means that the ankle is part of the driving movement - at a ...
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Circuit to provide position control for double action hydraulic actuator
I was wondering how to construct a hydraulic circuit to control a hydraulic double acting piston/actuator enabling the electronic control of the piston extension. I have found the following pneumatic ...
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Solenoid with 3mm stroke and ~1ms response time possible?
I need to extend and retract a needle as fast as possible with dwell time while retracted, while one option I really like would be to use Scotch Yoke with dwell. However that would mean the stroke and ...
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Why do high pressure multistage air compressor have different piston diameter sizes? [closed]
I meant like this kind of compressor https://www.bauer-kompressoren.de/fileadmin/_processed_/csm_compressor-block-junior2_b92a76a02e.jpg
also would the compressor reach high pressure if the diameter ...
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Cylinder's surface condition of gas springs (gas struts)
I've discussed part of these question somewhere else, but realized I have to be more specific about it. I'm new to this site and hope I'm doing the right thing.
I'm planning to manufacture gas struts ...
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How can I make inside a LSAW pipe uniform and smooth?
I am using a LSAW 16mm(OD) pipe, and I need to have a smooth and uniform surface inside it so a piston can reciprocate easily inside it. What is the best and fastest way to remove the inside weld line?...
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Work required to push an object inside a pressurized dome by using a piston
There is a large dome (pictured on the left side) with an internal pressure of 2 atmospheres.
Assume that the internal pressure of the dome will stay constant at 2 atm.
The purpose is to move an ...
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What is the force needed to exert on the piston for a certain extrusion rate of a syringe tube?
I am trying to design a syringe pump for microfluidic extrusion uses. I have a 5cc syringe tube that I will use as the cartridge. We would be using it to extrude a variety of materials so the ...
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Design Input: Rotary motion to Linear motion, What system should I choose?
I am posting this here because of the multidisciplinary knowledge needed to tackle this issue.
Problem: I have to make an electromechanical device that is required to have controllable (downward) ...
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Real life example of motor/piston involving an isoterm process?
So I am involved in an introductory course in mathematics for pilots. I have the following problem I would like to give them, as it can be a practical application of integration
However, does there ...
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How to calculate the speed and force of the piston in a vacuum syringe?
Suppose i have 4 empty syringes. And by empty i mean they were having the air sucked out of them, and they "contain vacuum". Assume the head of the syringe is blocked so vacuum can be formed.
I want ...
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What practically is constant volume heat addition in SI piston engine? [closed]
Isochoric means constant volume (In SI engine: piston should not move when the spark is ignited). In reality piston always keeps displacing up and down means volume changes. So, how does this make it ...
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Can hydraulics be used with a squarish piston?
I'm designing a custom part that needs an active shock absorber and space is restricted. I most likely won't be able to use a stock absorber and was thinking, can two squarish tubes be made tight ...
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how are these radial piston rotors machined
A typical radial piston rotor can have simple holes machined from the outside through the inner diameter to create flow channels for hydraulic fluid to actuate the pistons.
I came across this model ...
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What is this part called, and where could I get one?
I'm fairly illiterate when it comes to Engineering, so please understand I have pretty much 0 idea what I'm talking about.
I'm having to build a seawater distillation device for school, and we ...
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Fluid for mechanical lubrication and hydraulic connection to plastic/rubber parts
I have a piston made of anodized aluminium and stainless steel with nitrile seals which I need to connect hydraulically to our system which mainly consists of silicone rubber with polycarb and acrylic ...
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How Can You Calculate Force to Overcome Friction From an O-Ring Seal?
I essentially have a piston in a tube that is sealed with an O-Ring and actuated with a solenoid.
The friction of the O-Ring however, is higher than estimated (guessed as far as I can tell) by the ...
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Calculating piston force for pneumatic vs hydraulic
I'm trying to calculate piston force pressures for double acting pistons for pneumatic and hydraulic pressures. I found the following formula for calculating both
$$\text{Force} = \frac{\text{...
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Thermodynamic, ideal gas problem
I already know solution, I just want to understand something in part b.
A vertical cylinder fitted with a piston contains air initially at 120kPa and 100 celcius. The piston is restrained by a set of ...
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Why aren't modern pistons circular?
I'm trying to make most of an engine from scratch (cylinder, crank case, piston). I've been reading about pistons and I've learned that many modern pistons are cam ground--slightly elliptical in shape ...
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Can an electric motor use reciprocating pistons like an internal combustion engine does?
Would it be possible to have an electric motor that uses an electromagnet to force a piston up and down to turn a shaft, similarly to an internal combustion engine, but without burning fuel?
Is there ...
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How can a car can be lifted using hydraulic press?(Pascal's Law)
The above pic is describing the system how the car will be lifted if car is placed on the larger piston. But if the small piston is moved through 1m (say) ,then the piston is merely moved by ...
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How to couple two pistons to a rotating shaft so that the piston heads move like this?
Assume two vertical pistons with their flat head facing upward.
Is it possible to couple them to one rotating shaft in a way that the position vs. time diagram gets like this? (This is one complete ...
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Is there a mechanism that can turn circular motion into alternating circular motion?
I'm trying to power and agitator (alternating circularly back and fourth) with a crank. I've seen a bunch of complicated mechanisms that do this, but I'm looking for the mechanically simplest method.
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Are there design reasons why there aren't pneumatic pistons for chairs with a stroke >= 400 mm?
In the interest of saving space, I'd like to have a stool that can double as a table. I'd like the height to be adjustable from 16 inches to 32 inches.
But I can't find any pneumatic/spring piston ...
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Why there is no piston style pedal bicycle?
I have interested in walking bicycle. For the concept is just bicycle that you don't cycling pedal but stepping or striding to drive wheel
Which leads me to think that is it better if we use linear ...
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Schematic Reading - Fluid Control Limit Switch Question
Does limit switch LS1 remain pressed on until the piston moves to LS2?
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Find optimal configuration for Stirling Engine
I'm trying to figure out the theoretical calculations for a Stirling Engine system so I can determine optimal piston size, optimal piston displacement and number of pistons. I want to calculate which ...
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Spring - Piston with different extension and compression rate
I am in need of a device that extends freely without much resistance but compresses slowly.
I can provide a door closer analogy.The door should open fast but close slowly....
Do you think this can be ...
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Calculating leakage in an all steel piston cylinder arrangement
I wish to calculate air leakage in a piston cylinder arrangement. One side is pressurized and the other is at atmospheric pressure. All steel construction. No piston rings or lubrication. The piston ...