What is Brake: Definition and 138 Discussions

Homework Statement Hey y'all. Heres the problem: The flywheel to the right is spinning at 300 radians per second in a counter clockwise direction. The brake (to the left) is applied with a force F of 5kN. How long will it take the flywheel to stop rotating? Assume:  The flywheel is made of...

Hi! For a university project I have to design a braking mechanism for a remote controlled car. I have very little experience in designing constructions, so I thought I'd ask here for any advice on the matter. I'm mostly curious about the design pattern, the thought process I should be going...

Hi guys I have problem, basically I want to measure the power output from a water wheel. so basically I measured the power output by connecting the pulley that attach on the shaft of the water wheel. then this pulley is connected to other pulley which sit on the shaft of the DC motor. this DC...

Homework Statement Hey guys, not much of a physicist. But, I am fairly certain I am right. We are using a "prony brake" at school to calculate torque in a motor. To me the amount of force supplied should equal the amount of force the motor can turn ie: when the motor stops the force applied on...

how would you calculate the resistance required for a resistor which is in series with a generator (DC motor in reverse) to achieve a certain torque from the generator? Eg, there's a torque of 30kN acting on a 100kW generator while it moves at 50RPM. The is the same mechanism as electric...

Homework Statement A force F of 90N is applied to the cable and each calliper rotates about its hinge at B. With what force does each brake block at A push against the wheel rim? * Image attached * Homework Equations Moment_B = ( Distance from B ) x ( Force acting on calliper...

In automatics,one needs to press the brake (i.e the brake shift interlock switch) to shift the car out of park. What damage would happen if the brake shift-interlock wasn't present. Has it got something to do with the Fottinger fluid clutch? i.e with the automatic "creep" effect?

Is regenerative brake technology available on vehicles other than ecars and ebikes.if so what is the maximum efficiency reached till now on bikes and cars.

If we assume 70% of braked energy from the previous case is transferred to heat into two front brake rotors.How much would the mean temperature of front rotor increase when the vehicle is put to stop. Assume that : 1)rotor's diameter is 3mm. 2)rotor's thickness is 1cm. 3)Density : 7800...

Hi, Will I have a higher slipping force / torque by increasing the width of my brake shoe and drum? Though my instinct says it is possible, textbook says it's only the coefficient of friction that controls the slipping force. Can you pl help me understanding this? Thanks.

Hey guys I am working on a safety system for the brake system and I am looking for a detent switch that can be used to stop the system from working, ie the engine and fuel pumps an dother electronic controls in the car. The switch has to be SPST and should keep the system 'off' until the...

I have been trying to understand how the hand-brakes in my car function-and hence I read-up on brake drums and their functioning. Reasoning that one brake shoe(i.e 1 friction shoe out of a total of 2) always gets worn more than the other: if its a leading-trailing shoe type In common-usage...

Dear all, Can Torque max. be used instead of Power max. in the bmep equation?-(as shown on attached pic) The name of the equation seems to suggest it is only for Brake Power but hopefully i am wrong. Also, when I do a calculation for bmep for max. Brake Power and max. Torque, the bmep...

Most brake calipers sit on the edge of a wheel and connect to each other in some sort of "U" like shape, hugging the edge to clamp it. I have a need for a brake caliper whose sides connect right through the point of rotation, though, not around the side. My device I dreamed up in my head and...

Why is brake mean eff.pressure higher at max.Torque than max.power?,I am looking for an explanation in terms of equations,since I already know the theoretical reason i.e at Max.Power→the rpm is at Max for the engine →the friction losses are maximum→bmep at max power is lower than at max.torque...

Homework Statement Refer to Figure attached. A disk of conductivity σ and thickness b rotates around an axis through its center with a magnetic field B applied perpendicular to the plane of the disk over a small area a2. Find the approximate torque tending to slow the disk at the instant its...

Homework Statement Write an expression for the force applied to the brake caliper in the braking system(hydraulic) of a bicycle. F= force applied to the brake lever a = distance between F and the pivot point of the brake lever. b= distance between pivot point and lever piston. d1= diameter of...

what is the approx brake pedal force that a person applies while braking on the brake pedal?

Hi all, I am designing a Hydraulic press brake to air bend up to 4 feet of 1/8 in mild steel. I know it will take 11 tons of force per foot of material, 44 ton to do the trick. A 60 ton jack will cost over $1000, where 3-20 ton jacks are $40 each. My question, if I evenly space the 3 20 ton...

Homework Statement This is just for a formal engineering report, no product will be made. for my ME class, one of the very first courses. pre-requisite for this class is only vector static. This is the first week of class, and the lectures covered the role of engineers... I am being...

Greetings, I'd like to solicit assistance relative to a brake hydraulic system. I am rebuilding a vintage system that contains a pressure differential unit. The unit contains a dynamic piston with seals in a fixed bore. The seals are intended to keep fluid outboard of them in the bore. I...

Hello everybody! I imagined and prototyped this brake long ago for the deployment mechanisms of a satellite I never built. In essence, it's clean, it can work in vacuum and in a wide temperature range, and it can wait for long without maintenance, so other uses must be possible, like...

Hello. I tried to solve this question: So F1D1=F2D2. Thus: 60N/ 0,06m x 0,2 m= f/0,02m x 0,04m =100 Newton applied to the piston, but this doesn't fit to the answers offered. What did I wrong?:(

Hello , I have to change a car's rear drums to discs . I have the weight at each of the rear wheels . Using DAC I know the max speed and max Decelerations sustained by the car . What are the basic formulae used to calculate the braking forces and the braking distance .

I'm not talking about caked on or burnt on brake dust due to years of neglect. I'm talking my car has 5000 miles on it and came out from an oil change with greasy brake dust all over my alloy wheels. I am not the type to scrub my wheels all weekend, so I want to nip this in the bud before it...

Dimensions -- Disc Brake Surface Area During frequent braking under race conditions the disk brake rotors on the car described above reach a temperature of 500C. These disk brakes rely on forced convection to cool them. The dimensions of each disk rotor are: outer radius 130mm; inner radius...

Hello everyone, I am a new member here. Nice place you have; I have been reading on here again and again and figured it would be the right place to ask you about a problem I just can't get sorted out myself. It is about bicycles and disc brakes. I have an aluminum track frame that I want a...

Air brake over hydraulic brakes! Why air brakes are used in long vehicles like trains, instead of hydraulic brakes?

Homework Statement Investigate the amount of kinetic energy involved when your car's speed is 60 km/h, 50 km/h, 40 km/h, 30 km/h, 20 km/h, and 10 km/h. (Find your car's mass in the owner's manual) How much work does the brake system have to do to stop the car at each speed? Homework Equations...

I m doing ABS simulation, now I just wonder that how much break torque that brake pressure can produce,,, in my simulation I used about 1000 NM, I don't know is it too much? However, the result shown that car will stop from 180km/hr in abt 5 s,,,Is it make sense? Between, in the my code, I...

Hi there, I work in heavy machinery rebuilding and we were reviewing a leak test procedure to make it standardized. Essentially, the brake piston squeezes together the clutch plates (stationary) and the friction disks (which move with the shaft). The piston is pushed by compressed springs...

I'm trying to connect a disk from a brake to a shoulder using self locking screws but can't find a formula that would help me to calculate the torque these screws would be subjected to or how many bolts I would need. What do I need to do?

I've encountered a problem that I can't seem to make any logical sense of. Hopefully someone here can help! I have a 24VDC motor with an attached electric brake to prevent back-driving. The motor is controlled with a 5V analog joystick. The joystick has a button that needs to be pressed to...

Hi everyone! I am new to the forum but you have helped me many times in the past. I need your opinion about how much (roughly) brake torque can be produced by a regular car. I am developing a simplified vehicle model and I don't know how much torque to apply when the vehicle slows down. I...

I’ve built a light weight frame for a hoist which only needs to lift around 500 lbs. The cable spool needs to hold 250’ of 3/16 cable that can lift a submersible pump from that depth. The hoist will also be used to develop the well and without going into great detail about this, I’ll just say...

Homework Statement A hydraulic brake system is shown. The area of the piston in the master cylinder is 6.41 cm2, and the area of the piston in the brake cylinder is 1.69 cm2. The coefficient of kinetic friction between the brake shoe and the wheel drum is 0.449. How large is the...

To my intuition, I find more easy to believe that the universe is infinitely old and the big bag was just one of an infinite number of similar events in a larger universe, rather then the universe had a beginning. However, after watching many documentaries, and reading a lot of popular...

I am working on a project that uses two electric motors to control an elevation/traverse system. A problem with the motor that controls the traverse system is that it is able to be back-driven. To eliminate the back-driving, I will be adding an electric motor brake to mount on the the shaft...

There are different types of CCB units. Hydraulically powered, pneumatic, electromagnetic and of course mechanical. But, can anyone give me the proper advantages and disadvantages of electromagnetic CCB over other variants. Googled it. But invain. Regards.

So every mountain biker or motocross rider knows to never grab the front brake in the air. When you do the front end drops and can potentially ruin your day in a hurry. I figure that due to the loss of rotational inertia gravity accelerates the front wheel more rapidly, but I would like to see...

Homework Statement You're driving down the highway late one night at 20 m/s when a deer steps onto the road 35 m in front of you. Your reaction time before stepping on the brakes is 0.50 s, and the maximum deceleration of your car is 10 m/s^2. How much distance is between you and the deer when...

Homework Statement Design and Perform calculation for an Electromagnetic Brake system of a truck having 3 Axils assuming that each axil carries equal load. The truck is carrying a load of 30000 Kg and the weight of truck is 6000 Kg and moving with 100km/h speed before the brake is applied...

Hello friend. I am working of design of Electromagnetic Disc Brake system. I have performed some calculation. which you can find on following links. https://rapidshare.com/files/3568781938/untitled_folder.zip https://rapidshare.com/files/2134776724/untitled_folder_2.zip Please have a...

A while back I piggy-backed onto another thread (and then withdrew it as being out of place) an example of a system possibly violating the conservation of energy and momentum (angular momentum directly) - a spinning hollow right circular cylinder placed under frictionless axial compression. Many...

This has got my brain tied in a knot. Read https://www.physicsforums.com/showthread.php?t=304215" and felt you folks would have good insights. I have pieced together a spindle/hub/rotor combo that would require a 1" thick spacer to work. Using a 1 piece spacer and 10.9 mounting bolts, will...

I was trying to explain the ABS brake system to my daughter, then this question popped up. http://auto.howstuffworks.com/auto-parts/brakes/brake-types/anti-lock-brake1.htm I understand the ABS brake system in general, as the above website says, The question I have is, why is the...

I read an article about Brake Shafts bending behavior due to braking. Assume that there is a Shaft and to its end a brake disc is fixed. The shaft is set to rotate at certain rpm. Now when brakes are applied it seems the shaft tend to bend. Could anyone explain me the reason for this...

Brake Disc Design- Torque Acting On Wheel Stud Bolts I have currently been working on designing a brake disc assembly. The current problem i am having is trying to workout the force acting on each wheel stud. The frictional force of the brake pad is 3.2 KN with an efective radius of...

Homework Statement I have currently been working on a group project designing a brake disc assembly. The current problem i am having is trying to workout the force acting on each wheel stud. The frictional force of the brake pad is 3.2 KN with an efective radius of 105MM from the center...

Hello all,. I have been doing work on my brakes and now I would like to get new brake rotors. I replaced the standard brake pads with performance pads; I love them, and now I want even more. I already am going to replace the tires but I can't decide what brake pads I want. I have...