Piston Definition and 381 Threads

Hi All, First off, everyone on this forum is amazing. Period. Second, I had a thought experiment the other day that was interesting and was hoping you could comment on it: The System: Imagine an infinitely long hollow cylinder in one direction, made of a metal (perhaps aluminum). At the...

Homework Statement A vertical cylinder with a heavy piston contains air at 285 K. The initial pressure is 3.25 105 Pa, and the initial volume is 0.425 m3. Take the molar mass of air as 28.9 g/mol and assume CV = 5/2R. (a) Find the specific heat of air at constant volume in units of J/kg...

Homework Statement Find the constant Torque being applied. We are given a diagram of a piston engine, along with the masses of piston, flywheel and rod connecting the two. I know that the expanding gas in the piston does 4 kJ of work. I know that at the beginning of each rotation the engine...

Hi, Can someone explain the lubrication mechanism for a piston in a typical automotive internal combustion engine? If the walls in the piston chamber are coated with oil, the lubricant should also burn along with the petroleum during the combustion phase (leaving problematic residues), so, is...

Homework Statement Piston mass: 0.25kg Stroke (distance between extreme positions): 9cm 4500rev min-1 (a)Calculate acceleration of piston at maximum displacement (b)Calculate velocity as piston moves past its equilibrium point (c)What is the net force exerted on the piston at maximum...

Homework Statement Figure P1.30 (attached) shows a gas contained in a vertical piston-cylinder assembly. A vertical shaft whose cross-sectional area is 0.8 cm2 is attached to the top of the piston. Determine the magnitude, F, of the force acting on the shaft, in N, required if the gas...

Dear Experts, The car moves basically because of the energy from the explosion that happens in the cylinder which pushes the piston whose reciprocal motion turns the wheels. Does the explosion caused by the ignition of gas and air mixture lead to the exhaust gas dirtying the inside of the...

3.A cylinder/piston arrangement contains 5 kg of water at 100°C with x = 20% and the piston, mP = 75 kg, resting on some stops. The outside pressure is 100 kPa, and the cylinder area is A = 24.5 cm2. Heat is now added until the water reaches a saturated vapor state. Find the initial volume...

An adiabatic piston of mass m... Homework Statement An adiabatic piston of mass m equally divides a diathermic container of volume V and length l. A light spring connects the piston to the right wall. In equilibrium pressure on each side of the piston is P. The container starts moving with...

Homework Statement A piston is seated at the top of a cylindrical chamber with radius 5 cm when it starts moving into the chamber at a constant speed of 3 cm/s. What is the rate of change of the volume of the cylinder when the piston is 2cm from the base of the chamber? Homework...

Homework Statement No need to include the figure, it's pretty much a piston sitting on some stops. Homework Equations Errmm...none I think The Attempt at a Solution My question is in regards to part c, and then part e. I know that in state 2 it's a superheated vapour...

The problem given says: A cylinder has a cross-sectional area of 0.02 m^2. How much work is done by a gas in the cylinder if the gas exerts a constant pressure of 7.8x10^5 Pa on the piston, moving it a distance of 0.06 m? I figured I needed to find the work, but I didn't have the force...

OK very crude first sketch let me try to explain and you tell me if it sounds remotely workeable. Likemany other eco nuts after the holy grail of energy, I'm trying to brainstorm a low cost solar CHP system. I'm of the opinion that passive solar is always going to win on a BTU/$ collected and...

Homework Statement Two pounds of air contained in a cylinder expand without friction against a piston. The pressure on the back side of the piston is constant at 200 psia. The air initially occupies a volume of 0.5 ft3. What is the work done by the air in ft-lbf if the expansion continues until...

Homework Statement If the cross-section of the barrel of a pump is 5 square centimeters, the stroke of the piston is 20 centimeters, and the volume of the receiver, in which the air is drawn from, is 1 liter, calculate the ratio of the pressure of the air in the receiver to the original...

Homework Statement The piston has a displacement of 10 cm and there are 50 cycles per second. Calculate the average acceleration that occurs between the start/stop point and the middle of the cycle. This value has to do with evenly accelerated movement. This can be described according to the...

We are designing a foot pedal mechanism to actuate two hydraulic pistion pumps. But the torque to actuate a pump is more than 50In-lbs at full stroke. In addition, a spring is used to make the control shaft of a pump return to its neutral position. Totally the torque to actuate a pump is...

I am wanting to form an equation I can use on excel that allows me to find how far the piston has gone down depending on how many degrees the crankshaft has turned. I know the length of the stroke but I also know that the stroke is not linear to the degrees turned, as in the stroke goes farther...

Homework Statement Consider the simplified single-piston engine in the figure. The piston rod oscillates in simple harmonic motion. The wheel of radius 1.89 m rotates at a constant angular speed of 6.7 rad/s. (my own paint version of the figure) If the piston is fully extended at time t = 0, find...

Homework Statement A piston in an automobile engine is in simple harmonic motion. Its amplitude of oscillation from the equilibrium (centered) position is ±6.87 cm and its mass is 1.472 kg. Find the maximum velocity of the piston when the auto engine is running at the rate of 3220...

Homework Statement Suppose the system is at room temperature, 300 kelvin, and that before we put weights on top of the plunger in the cylinder the pressure inside is 1 atmosphere. 1)If i place a .5kg block on top of the piston, what is the pressure of the gas inside the cylinder? 2)At that...

This came up in class today and based on the equations it makes sense, but logically I can't get my head around this. Let's say we've got a hydraulic system with two pistons: Piston 1: 2cm2 Piston 2: 12cm2 Piston 1 moves a distance of 21cm, which according to A1D1=A2D2 means that Piston...

What are all the given aspects of this? I understand how the reaction happens, but what about it pushes the piston.

Homework Statement A piston cylinder device with a spring attached initially contains 0.02m^3 of R-134A at 50C. A valve connected to the cylinder is opened and 20kg of R-134A enters the device from a supply line at 800kPa and 80C. The spring is compressed and the piston moves up. The process...

how can i find pressure or force in piston cylinder if i have... crank speend=5000rpm crank shaft throw=42mm piston diameter=95mm piston gudgeon mass=500g i know cylinder diameter=bore... is crank throw=stroke?

Homework Statement Working through 5.17 problem in Bedford 5th edition (Engineering Statics) p214 "The hydraulic piston AB exerts a 2000 N force on the ladder at B in the direction parallel to the piston. Determine the weight of the ladder and the reactions at C." piston between A and B on...

Homework Statement Piston 1 in the figure below has a diameter of 0.31 in.; Piston 2 has a diameter of 1.7 in. In the absence of friction, determine the force vector F necessary to support the 500 lb weight. Homework Equations F1/A1=F2/A2 The Attempt at a Solution I used...

Hope someone is able to assist. I have been musing about generating greater efficiencies in ICEs and pose the following: * Consider the exhaust phase of an internal combustion engine (diesel or gasoline) in which the exhaust stroke is pushing hot gases and particulates out of a simple valve...

Freinds, I have to design and simmulate a pneumatic piston cylinder, and want to calculate force profile of piston with time. please help me in this regard, also please tell me any simmulation software simmulating pneumatic piston cylinder.

Hi, I am industrial automation engineer,I am 52 years old and I am from Romania. I would love to talk with you about "ROTARY MACHINE WITH ECCENTRIC PISTON" ,I like to say:"rotary piston" I asked the name "Rotary Piston" but the Patent Office has given the name:"ROTARY MACHINE WITH ECCENTRIC...

Homework Statement a piston of mass M is attached to a cylinder made from thermal insulation. There is no friction between the piston and the cylinder. At first, the cylinder is placed horizontally and n mol of an ideal gas of monatomic molecule at the same temperature To and the same pressure...

Homework Statement A cylinder is equipped with a smoothly movable piston which is connected by a spring to the bottom of the cylinder as shown in the figure. An ideal gas of 0.1 mol is confined in the space on the left side of the cylinder at a temperature of 300 K. The atmospheric pressure is...

I have already asked the question of piston diameter size and efficiency in an earlier thread but i'll recap. My question was that is it true that the larger diameter piston have a larger propensity to overcome the mechanical loss of fricition due to the piston rings contact with the mating...

Hello everybody, I have kind of a philosophical question about vacuum and piston. I know this does not work in the real world because, of imperfection in seals and lack of "real vacuum", but here it goes. If you have a tube which is closed in one end, open in the other end, and 100% rigid...

Homework Statement A piston in an automobile engine is in simple harmonic motion. Its amplitude of oscillation from the equilibrium (centered) position is ±4.73 cm and its mass is 1.733 kg. Find the maximum velocity of the piston when the auto engine is running at the rate of 4380 rev/min...

Homework Statement 645 J of heat is transferred to 0.185 mol of air inside a cylinder with volume 0.40 L. The air is at initial pressure is 3.00E6 Pa and temperature 780K. Find the final temperature if the cylinder volume is allowed to increase while pressure remains constant.Homework...

Homework Statement Ok the problem I have been set has a frictionless piston containing steam at 200kpa at 200 degrees c and it is originally at 0.5m^3. It has a linear spring above it just touching and exerting no force. Heat is added and the gas expands pushing the cylinder up and causing the...

Homework Statement A vertical cylinder contains 500 moles of a monatomic ideal gas and is closed off by a piston of mass 50 kg and a cross-sectional area of 100 cm2. The whole system is thermally insulated during the entire process described below. Initially, the piston is clamped in...

Please explain why sometimes a shim is also installed in the groove of a piston ring, in a piston.

Hi, I have an assignment due tomorrow and have been working for hours and hours on it, and have done all of the questions pretty much, except for these 2 parts of questions, since it is due tomorrow morning if someone can help me out that would be great! Here they are: 1.Consider a system...

Homework Statement Imagine a hydraulically operated dentist's chair having a mass of 200kg, and in it is stiing a 54.8kg patient. The large piston below the chair has 5cm(diameter), while the small piston, moved by a pedal on which the dentist steps, has 1cm(diameter). What's the pressure in...

The purpose is to investigate the relationship between the cylinder diameter and the range of motion of a piston in a hydraulic system. The teacher didn't give any initial of final position at all, so I think the teacher means in general. Homework Statement What is the displacement of the...

Homework Statement Perfect gas in an enclosed cylinder, the thermal capcity of the components in the cylinder and piston are small and they are perfect thermal insulators. The piston is pushed in slowly and allowed to return to its original position slowly. How does the Temperature vary with...

Hi could someone tell me if it is possible to calculate the shear loss from a metal piston ring against the cylinder in a hydraulic pump when the outlet pressure and speed (in rpm) of shaft are known. Cheers (Updated: maybe along the lines of in cylinder pressure x piston speed x friction...

suppose a bike which has 2 piston engine and other is 4 piston. which one is most powerful? thanks

Homework Statement A piston can move without friction inside a large tube of .002m^2 of cross sectional area. The weight of the piston is negligible. A mass of kg sits on top of the piston as shown in the figure below. The large tube is connected to a horizontal smaller tube which has 4 x...

Homework Statement A vertical cylinder of cross-sectional area 0.25 m2 is fitted with a tight-fitting, frictionless piston of mass 22 kg. The acceleration of gravity is 9.8 m/s2 . If there are 1 mol of an ideal gas in the cylinder at 310 K, find the pressure inside the cylinder. Assume that...

Homework Statement A closed system comprising a cylinder and frictionless piston contains 1kg of a perfect gas of which molecular mass is 26. The piston is loaded so that the pressure is constant at 200kPa. Heat is supplied causing the gas to expand from 0.5m^3 to 1m^3. Calculate heat...

Alright. I need a motor that is capable of pumping air into a piston filled with compressed air. The motor needs to pump the air into the piston at a constant speed, as the piston is being used to raise up a load. The problem is that the weight of the load on the piston will be between 10-200...

I did a few derivations to calculations to figure out the velocity of efflux off a pipe which is situated on the piston of a piston cylinder arrangement. Attached is the attempt...though I have a doubt in it - An attachment follows...can someone confirm if it's correct?