A damper is a valve or plate that stops or regulates the flow of air inside a duct, chimney, VAV box, air handler, or other air-handling equipment. A damper may be used to cut off central air conditioning (heating or cooling) to an unused room, or to regulate it for room-by-room temperature and climate control. Its operation can be manual or automatic. Manual dampers are turned by a handle on the outside of a duct. Automatic dampers are used to regulate airflow constantly and are operated by electric or pneumatic motors, in turn controlled by a thermostat or building automation system. Automatic or motorized dampers may also be controlled by a solenoid, and the degree of air-flow calibrated, perhaps according to signals from the thermostat going to the actuator of the damper in order to modulate the flow of air-conditioned air in order to effect climate control.In a chimney flue, a damper closes off the flue to keep the weather (and birds and other animals) out and warm or cool air in. This is usually done in the summer, but also sometimes in the winter between uses. In some cases, the damper may also be partly closed to help control the rate of combustion. The damper may be accessible only by reaching up into the fireplace by hand or with a woodpoker, or sometimes by a lever or knob that sticks down or out. On a wood-burning stove or similar device, it is usually a handle on the vent duct as in an air conditioning system. Forgetting to open a damper before beginning a fire can cause serious smoke damage to the interior of a home, if not a house fire.
This post is somewhat of a continuation of this other post. I would like to better understand induction and be able to link the electrical equations with Newton's.
For reference, this is a paper about the Eddy Current Damper I would like to study first.
I think these components are very well...
Can someone help me evaluate an idea that I have?
I'm investigating the idea of placing a very progressive pull spring and a digressive shock on a rocker to control the timing and rotation of an axle.
I could be way off, but here's the scenario in my head. Both shock and spring are being...
Hi,
I'm not quite sure if I'm correct. I need to find the boundary conditions for 2 ropes ##T_1 \mu_1, T_2 \mu_2## fixed at ##x=0## to a massless ring with a massless damper of force ##F_d - -bv_y##
Here what I think, since the ring and the damper is massless ##\sum F_y = 0##. Thus, ##-T_1...
Ok, the last time I did something with physics, save for simple in-game simulation of gravity, was many moons ago in high school.
I certainly did not learn to do this in high school, although two subjects I had there at a basic level, are touched: Waves and Classical mechanics.
I have no idea...
The other day when I solved a spring mass damper system in Matlab, I was curious how in olden days would have people solved the equation. We all know the 2nd order differential equation of the system:
However if I know the time, damping coefficient, stiffness and mass, will I be able to find...
Good evening,
I have been wrestling with the following and thought I would ask for help. I am trying to come up with the equations of motion and energy stored in individual suspension components when a wheel is fired towards the car but, there is a twist!
I am assuming a quarter car type...
I was reading the difference in construction between a car clutch (dry, single plate) and a motorcycle clutch (wet, multiplate). I understand wet multiplate clutches do not have torsional springs in them.
How is the Engine vibration damped then?
Can we not use this same arrangement in a car?
This is not actually an automotive project but the thread should suit practical petrolheads and the like, I think.
My problem is that our front garden gate needs a strong spring so that it will shut and latch itself reliably and prevent our (visiting) dog from getting out onto a fairly busy...
Hello,
In problems that involve springs and viscous dampers, eg a mass falls on a spring that also has a viscous damper, how can we calculate the energy absorbed by the damper?
I mean, we know the energy absorbed by the spring (1/2*k*x^2), we know the kinetic energy of the mass (1/2*m*u^2)...
Hello all,
I'm trying to calculate the pressures exerted back on a piston by a working hydraulic fluid in a damper system. I've attached a drawing of the system and the equations I'm using. Essentially the piston motion is restricted by flow through an orifice. I have data for the flow rates...
Homework Statement
Find equations of motion for mechanical system given by picture, where m = 1kg, k1 = 10, k2 = 25, b = 3 and natural lengths of springs are a1 = 1m, a2 = 2m. The whole system is in a gravitational field g = 9.81m/s^2
Homework EquationsThe Attempt at a Solution
I came up with...
Hi!
I have this project on my CAE classes in which I have to design a system like this,
which would be in equilibrium, so i guess that the masses should move with the constant amplitude. I have no idea how to calculate the k parameter, I tried to do this analogically to mass-spring damper...
Evening all,
I've recently undertaken a project where my roll is to analyse the suspension of a mountain bike. The suspension unit in question is a Rock Shox Monarch RT3. To give a brief summary:
The shock uses compressed air as the spring, the pressure is adjustable via an air valve.
The shock...
Homework Statement
Homework EquationsThe Attempt at a Solution
So I'm assuming my solution is just as valid as the one in the book, if not, can somebody explain to me why? I prefer my solution since they say that phi is a known function.
Homework Statement
Diagram for a vehicle suspension is given. Displacement of wheel is given by 'x' and and displacement of body is 'y'.
Spring constant, k = (7*10^4) Nm
Damping coefficient, c = (3*10^3) N/m/s
mass,m = 250kg
a) Make a Laplace Transform of system and utilize it to predict 'y'...
Homework Statement
[/B]
I have this system below.
It is the schematic of a linear accelerometer moving horizontally, where m is the total mass of the slide, b denotes the viscous damping, and k represents the spring constant. The relative position between the moving mass and the case is...
Hi guys. It could be an easy question but I started at the deepest. I wonder how it works like a car suspension system. How does damper work with spring? What is the difference between forced-nonforced systems? Why do we calculate frequency of spring? What does it provide us? What is the point...
Homework Statement
I'm trying to derive the equations of motion and state space as well as the transfer function for a system which has two mass spring damper systems stacked on top of each other. The system is base excited. I attached a pic of the system
Homework Equations
- Sum of the...
I'm trying to find a solution to a system in which a clamped free Euler-Bernoulli Beam system rests on top of a mass-spring-damper system. The MSD system has nonlinearities in both the spring and the damper and is of the form:
I have extended the nonlinear restoring force to its 3rd term and...
Hey guys I'm trying to figure out the ideal knee speed or velocity split for a particular car that I'm designing. What I'm trying to do is relate the knee speed (or crossover speed) of my damper to the crossover point in the displacement transmissiblity graph so that I can achieve optimum...
I've been a bit lost figuring out what damper I should be using for the front suspension I am designing. Right now I'm running a wheel rate of 60 lbf/in at the front with a ride frequency of 1.2254 Hz. The front is also supporting a sprung mass of 391.68 lbf. Comfort is the end requirement of...
Homework Statement
If an aeroplane of a mass of = 5000 with a velocity of ̇ = 500/ℎ has to land on a daily
basis what would be your design characteristic of a damping system to absorb the ground energy
contact within 5 seconds.
Hint: Your answers may include:
i. The values of k (the spring...
Homework Statement
1. The first part of the problem was to find a transfer function. Output is the displacement of the mass (mass of pinion is negligible)
2.The next thing to do was find the poles, which I believe means set the denominator=0 and solve for s.
3. The next thing to do was find...
Homework Statement
Consider the inverted pendulum system, where a uniform rigid bar of mass m and length L is elastically hinged on top of a lumped mass M. The bar is constrained by a torsional spring of coefficient kτ and the mass is constrained by a damper of coefficient c. Derive the...
I am quite uncertain as to why the rear damper is inclined at a angle to the inside of the car. By doing so, does one ensure for rear wheel travel to be along a curved up/down path? i.e I am perplexed as most of the modern rear suspensions are multi-link and have their dampers inclined → This...
Homework Statement
The problem is to determine the transfer function where force F is input and displacement x is output in the mass-spring-damper mechanism.Homework Equations
Spring Force = kx [k:spring constant]
Damping Force = Cx [C:damping coefficient]
Force = (Mass)(acceleration)
The...
Hello,
How can one calculate the dimensions of valve shims in Gas pressure shock absorber?
Desription-
The valve shims are orifices to the fluid flow in the hydraulic damping system. The dimensions play a very vital role in the adjustment of compression and rebound of the damper.
I have...
I understand that the purpose of a damper system is to stop the spring from bouncing during rebound. But,technically speaking,I do not understand the matter of energy absorption in the damper during rebound.
1.The damper is absorbing energy during compression along the bump and dissipating...
How does one go about making a damper for a rotating system? Let's say we have a wind-up toy, and we want it to go slower, or something like that.
Sorry for such a basic question, but I can't really figure out a decent way to do this.
Any ideas?
Homework Statement
The translational system in the first attachment represents the rear/front suspension of a car of mass 1262kg. The distance between the axles is 2.41m and the distance between the centre of mass and the front axle is 1.22m.
I am told that:
m2 = 40 kg
c1 = 800 Nm/s
k1...
Homework Statement
A 10 kg block is displaced 20 mm and released. If damping coefficient is 100 N.s/m,
how many cycles will be executed before amplitude is reduced to 1 mm or below? The stiffness
of the spring is k=20000 N/m.
Homework Equations
The Attempt at a Solution
I...
Hello,
I have a mechanical motion platform. It's only about 8 grams and about 5x5x5 cm.
I'm a bit worried about the natural frequency and I want to mechanically damp it to slightly under-damped. I'm using phosphor-bronze for my spring elements, I'm not sure how much damping is intrinsic to...
Hi,
I am designing a wave energy converter, which has one degree of freedom - heaving motion. Meaning it will move only in vertical direction.
My system can be considered as a Mass Spring Damper system.
Thus my equation of motion is:
F=Fh+Fe
Where,
Fe= Excitation force...
Homework Statement
Write equations that could be used to solve for, V_{1}(s) \quad , \quad V_{2}(s) in the Laplace domain for the mechanical system shown in the figure attached.
Homework Equations
The Attempt at a Solution
I think I understand most of the problem, but I think I...
Hello!
I am taking a course in dynamics and have a question about a spring-mass-damper system (see the attached file) that I want to solve using Lagrange equation (see attached file).
I am having trouble writing the equation of motion for this problem. At first I tried doing it the way I...
Hi guys:Imagine a spring and and damper in parallel, connected to the ground on the right, and connected by a node on the left.I never quite understand why it is said that the forces between the two must be zero.According to my professor and the textbook, it is because the node has no mass, so...
Hi,
This is a real life problem I am trying to find vibration effects.
I have 2 servo motors constantly going back and forth on a granite countertop. The two servo motors are moving two 75 KG masses.
I am trying to solve for the vibration effects that will happen on the granite...
1. Homework Statement
B, K, M
2. Homework Equations
1. xs(t) -----spring ----mass-----damper-----fixed, derive DE for x of mass
given :2. F - > M -----spring-------damper ---- fixed in series, derive the DE for velocity of spring
3. The Attempt at a Solution
1. ma =...
For a report I am investigating whether a gyroscope could be used to stabilise the skyscraper Taipei 101 instead of the tuned mass damper, I have figured out how to set up the gyroscope but I need to calculate radius, speed of rotation etc. To do this I need to find the equivalent moment exerted...
Hi I'm a bit stuck on a problem I'm trying to figure out.
I am trying to design a damper, the layout is show below:
(apologies for the poor 'cad' drawing!)
So far i know:
I for the beam, how much energy needs to be absorbed by the damper (4500j) and the stroke (15mm). The maximum loading...
Homework Statement
I am trying to design a damper but am struggling with some calculations.
The layout is shown below
The two red beams are fixed length, with the longer beam rotating clockwise around the blue pivot
The specification I have to go on is that the damper has to absorb 4500J...
Hello,
I have a question about power dissipated in a linear damper. I know that power is equal to force times velocity, and that force is equal to the damper coefficient times velocity.
What I have to work with is the coefficient and the velocity of the damper, so the instantaneous power...
basically, I am trying to reduce vibrations from my break barrel air rifle which has dual recoils in either direction. they happen almost simultaneously, but it still throws off my accuracy as one occurs just before the pellet leaves the barrel. the kick isn't strong but rather sharp. here's a...
For a project we are supposed to design the suspension system of a half car model. We are supposed to determine the values of the spring constants and damping constants. We are given the mass of the half car, the moment of inertia about the center of mass, and the wheel base. We are given a...