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Topic: Dynamic brake

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	Mine Safety and Health Administration (MSHA) - Technical Reports - DYNAMIC HOIST TESTS
		The motor brake applies a braking force directly to the motor shaft and is adjusted to set after the conveyance is stopped by the drum brake.
		The dynamic braking resistor would dissipate the energy generated by the overhauling load, and the load would be lowered at a safe slow speed.
		The hoist should slow down to a predesigned dynamic braking speed and continue at this speed until the holding brake is reactivated, thereby stopping the hoist.
	www.msha.gov /S&HINFO/TECHRPT/HOIST/PAPER2.HTM (0 words)

	RAILROAD.NET - Shop Notes - Locomotive Blended Braking
		Locomotive blended braking is the braking of a locomotive through simultaneous use of both the dynamic brake and the air brake.
		As both the air brake effort and the dynamic braking force are taken by the DA module for braking calculation, the maximum braking capability of the locomotive will be obtained from maximum dynamic brake retarding force in combination or "blending" with a portion of the brake cylinder pressure as required.
		As the dynamic brake retarding force is proportional to the locomotive speed, the brake cylinder pressure is increase through the action of the DA module and magnet valves to maintain maximum locomotive braking efficiency.
	www.railroad.net /articles/columns/shopnotes/blendedbrake/index.php (788 words)

	PC Form EC-99 BRAKE AND TRAIN AIR SIGNAL INSTRUCTIONS
		Dynamic Braking On locomotives equipped with dynamic brake, the automatic brake may be used when using dy- namic braking as the dynamic interlock prevents air brakes applying on the locomotive, however, the independent brake must not be applied while using dynamic brake as it may cause locomotive's wheels to slide.
		Dynamic Braking The dynamic brake, where provided, may be used to reduce speed, to bunch the slack before using automatic air brake, and to hold the slack in while releasing train brakes on a moving train.
		The dynamic brake may be used, within the speed and current ranges for the class of locomotive in- volved, independently of or in conjunction with the train air brakes to control the speed of a train.
	penncentral.railfan.net /pc-rules/ec-99_3-69.html (16581 words)

	Active Dynamic Brake (ADB-2) - Selectronics, Inc.
		In the traditional configuration of the Leesona winder the process of slowing the spindle to a stop for doff or after a yarn break has occurred is accomplished by draining off the kinetic energy of the spinning package.
		This “braking effect” is created by “dumping” this energy, in the form of electric current produced by the motor’s spinning armature, into a fixed-value resistor.
		The "braking rate" is internally adjustable by a potentiometer and may be set to the most desirable braking profile for any application.
	www.selectronic.com /ADB.htm (459 words)

	Electronic control dynamic brake proportioning - Patent 5015040
		Torque proportioning between the front and rear wheels of a vehicle is achieved by controlling the speed of each rear wheel, via modulation of the hydraulic brake pressure of the rear wheel during braking, to be the same as the speed of the front wheel on the same side of the vehicle.
		During braking of an automotive vehicle, the brake torque (the torque established by the wheel brakes resisting wheel rotation) generated by a hydraulic brake system causes the wheel to decelerate.
		The pressure modulator 26 is controlled to modulate the brake line pressure at the calipers 22 for establishing brake torque at the rear wheel by means of an electronic controller 30 in a manner so as to establish the speed.omega..sub.r of the rear wheel equal to the speed.omega..sub.f of the front wheel during vehicle braking.
	www.freepatentsonline.com /5015040.html (0 words)

	To Brake, or Dynamic Brake? - Trains.com Forums
		The brakes are activated by air pressure from the brake cylinder on each car that are linked to all the brake pads by the rods and levers of the brake linkage.
		With dynamic brakeing you have to plan ahead as when you are brakeing you are only doing it from the locomotives and if they are all at the head end you have a whole trains worth of slack action to controll.
		Development of approximately 15-18 psi of independent brake cylinder pressure, dynamic braking will be reduced to that of a standard range dynamic brake or, depending on locomotive brake cylinder pressure switch design, will eliminate all dynamic braking completely.
	www.trains.com /TRC/CS/forums/1/730099/ShowPost.aspx (0 words)

	Dynamic braking resistors manufactured by Post Glover IPC
		Braking cycle is usually stated as a percentage; however, the actual times on and off can be used to offer the optional resistor package while minimizing size and cost.
		Dynamic Braking Resistors are used with AC VFD's to produce a braking torque in the motor during overhauling conditions.
		The dynamic braking resistor is connected across the DC bus and will see voltages as high as 800 volts.
	www.postglover.com /dynamicbraking.html (583 words)

	DPG Online - Dynamic Corporation (Site not responding. Last check: 2007-10-31)
		Dynamic Corporation became the supplier of resistors for all new GE locomotives in 1986 and started producing resistors for the transit and AC locomotive markets in 1993 and 1994.
		Dynamic was purchased in 1999 by Amsted Industries, an industrial manufacturer serving three major markets: railroad, construction and building, and general industrial.
		Dynamic was the first high-capacity resistor manufacturer to obtain engineering approvals as an OEM supplier for both Electro-Motive Division and Diesel Division of General Motors and General Electric for new locomotive production and aftermarket service parts manufacturing.
	www.dynohm.com /division.php?division_key=3 (282 words)

	North American Freight Train Brakes (Site not responding. Last check: 2007-10-31)
		This connects the brake cylinder to the atmosphere, releasing the air pressure in the cylinder and thus releasing the brakes.
		An equalising valve is connected between the equalising reservoir and the brake pipe and it is this valve that vents the brake pipe air to atmosphere until it reduces to be equal to the equalising reservoir pressure.
		The corresponding brake pipe REDUCTIONS are 26 psi for the 90 psi brake pipe, 29 psi for the 100 psi brake pipe, and 23 psi for the 80 psi brake pipe.
	www.railway-technical.com /brake2.html (7065 words)

	Air brake (rail) - Wikipedia, the free encyclopedia
		Electro-pneumatic or EP brakes are a new type of air brake that will allow for immediate application of brakes throughout the train instead of the sequential application for the current type.
		These generally involve connecting the air brake hoses, charging up the brake system, setting the brakes and manually inspecting the cars to ensure the brakes are applied, and then releasing the brakes and manually inspecting the cars to ensure the brakes are released.
		The train in question had brake shoes that lost their grip when overheated, and this train was diverted to a line with a 30km 900m descent from Katoomba to Emu Plains.
	en.wikipedia.org /wiki/Air_brake_(rail) (2143 words)

	Dynalite Dynamic Mount Drag Race Rear Axle Kits (Site not responding. Last check: 2007-10-31)
		Dynamic Mount Rotors separate heat distortion between the hat and rotor and provide truer running with lower drag at the rear axle.
		GT brake hats are precision machined from premium grade aluminum and engineered for maximum strength with the lowest rotating weight.
		Dynamic mount hats use specially machined slots with T-Nuts to provide an extremely durable "floating mount" for the rotor.
	www.wilwood.com /BrakeKits/Pages/15/index.asp (838 words)

	DS Series Direct Acting Caliper Brakes
		The TL series brake is particularly well-suited to accommodate very high braking torque requirements in the harshest environments.
		The brake size must be chosen to give required braking torque and to dissipate the energy during stopping without over heating the disc.
		Brake torque is often related to drive motor torque by an arbitrary service factor typically 75% -100% full load torque for crane travel and similar inertial loads which tend to be self stopping or 150% -200% for crane hoists and other overhauling loads.
	www.brakes.ca /tlcalipers.html (462 words)

	TCE Performance Products - Producing Winning Results since 1993
		Dynamic distibution takes into account the weight shift of the vehicle during a braking event.
		Braking force in G. This is an inertia force measurement equal to the total weight of the vehicle; 1G equals 3200lbs for example and 2G equals 6400lbs.
		The purpose of the Dynamic Distribution Calculator is to use this with the Bias Calculator to estimate the required mix of front and rear brake torque or Dynamic Bias of a vehicle.
	www.tceperformanceproducts.com /dynamic_dist.html (701 words)

	BMWTips.com Vehical Brake information (Site not responding. Last check: 2007-10-31)
		Brake Power is determined by the rate of KE to TE transfer, or also know as WORK.
		Basically, fade is caused by over use of the brakes to the point where a majority of the fluid pressure and/or pad friction is lost.
		SS lines almost always make a difference at braking events at or over 0.25g, this is equivalent to the kind of hard braking you see when driving back roads in an aggressive manner.
	www.bmwtips.com /tipsntricks/BrakeInfo/brakes.htm (3029 words)

	Low Speed Plate Brake Tester (Site not responding. Last check: 2007-10-31)
		When brake torque is applied to a wheel, a braking force or retarding force is generated at the interface between the tire and the road surface.
		The amount of braking force that can be generated by a wheel is dependent on the load on the wheel, the construction of the tire and the condition of the road surface (friction between the tire and road).
		Braking efficiency is defined as the ratio of maximum vehicle deceleration without wheel lockup divided by the coefficient of friction between the tire and the road.
	www.hunter.com /pub/undercar/901701/btest.htm (10333 words)

	Dynamic Brake for an Automotive Engine Test Bench (Site not responding. Last check: 2007-10-31)
		Typically, the relevant dynamic test cycles are translated into equivalent dwell times at a number of characteristic operating points of the engine with respect to speed and load.
		d) dynamic misadjustments in the air-to-fuel ratio (due to the dynamics of the air transport in the intake manifold, several aspects of fuel dynamics and sensor and actuator dynamics) leading to (largely avoidable) spikes in the emission rates.
		By replacing the static dynamometer of the engine test cell by a dynamic brake, most of the above-mentioned problems could be studied and solved in a systematic manner, with more efficiency, and at lower development cost.
	www.oldimrt.ethz.ch /~shafai/Public/1983_P1.html (401 words)

	BMW World - Technology
		The criteria for full brake application are the speed with which you apply the brakes and the amount of brake pressure you exert.
		An emergency is defined by DBC on the basis of the rate of increase in brake pressure in the main brake cylinder.
		A brake pressure sensor records the magnitude and speed of the brake pressure change and the sensor communicates these values to the DBC control unit.
	www.bmwworld.com /technology/dbc.htm (0 words)

	Dynamic Brake conversion kit
		The replacement hood section has the dynamic brake cooling air intake louvers molded into the sides, and a fan set into the fan mounting plate on the top.
		The heater duct was inside the dynamic brake section on the DB equipped SW8's, but on standard units was inside a small box mounted in the corner between the right hood side, the walkway and the cab wall.
		Ed Heck of Reading and Northern RR graciously arranged for John Gabriel and I to be able to measure 803 to nail down the shape of the hood in the dynamic brake section.
	www.lvrrmodeler.net /DBkit.htm (0 words)

	Heidelberg - Speedmaster CD 74 - User Report: Häuser KG and Artoos Communication Group Belgium
		In this context, the dynamic sheet brake in combination with the new blast air delivery system on the Speedmaster CD 74 is a decisive advantage also for Artoos.
		But even with just two sheet brakes, make-ready of all grammages and printing stocks takes place at a speed of 12,000 sheets per hour and jobs are processed reliably at up to 15,000 sheets per hour.
		The innovative dynamic sheet brake together with the precisely adjustable blast air delivery system is highly appreciated by both print shops as "the best delivery they ever had" as it allows them to take full advantage of the maximum speed of 15,000 sheets per hour reached by the Speedmaster CD 74 perfecting models.
	www.heidelberg.com /www/html/en/content/articles/product/success_stories/speedmaster_cd74_haeuser (595 words)

	Dynamic Brake Requirements (Site not responding. Last check: 2007-10-31)
		Use of dynamic brakes is an effective method to control speed and stop trains.
		The requirements to identify inoperative brakes only includes dynamic brakes that are defective or ineffective due to malfunction.
		Tagging does not have to take place if the dynamic brakes are simply cut out to comply with dynamic brake axle limitations.
	tp1.clearlearning.com /ballew/10/htm/dbr.htm (135 words)

	AutoWeb - BMW Dynamic Brake Control Further Increases Safety
		The criteria for activating full application of the brakes are the speed with which the driver applies the brakes and the level of brake pressure applied.
		The hydraulic unit is part of the Dynamic Stability Control (DSC) system and its activation allows for the most effective application of the brakes in an emergency braking situation.
		DSC allows for the computer controlled application of brake pressure to any or all of the wheels in a manner designed to retain directional stability of the car in critical situations.
	www.autoweb.com.au /start_105/showall_/id_BMW/doc_bmw9809221/article.html (426 words)

	SP Operating Rules 1960 -- page 165
		In using dynamic brake, ten seconds should elapse after throttle is placed in idle position before making any move to initiate dynamic braking.
		When speed of train and dynamic braking characteristics of units comprising the engine are such that harsh slack action would result from dynamic braking, it is permissible to use the independent brake in lieu of the dynamic brake to gather the slack gently.
		Automatic service brake applications while the dynamic brake controlling lever is in OFF position should be avoided.
	espee.railfan.net /sp_rules-regs_1960/rules-165.html (224 words)

	[IRFCA] Using Dynamic Brakes in an Electric Loco
		The Dynamic or Rheostatic brake is applied by the crew to control the train without any application of train brakes or locomotive brakes.
		For applying dynamic brake, the master controller (MP) is brought to the 'O' position from the traction mode.
		The locomotive brake should not be applied while applying dynamic brakes as it may cause wheels to lock and slide on the rails.
	www.irfca.org /docs/waX-dynamic-braking.html (196 words)

	Dynamic Brakes
		When the industry moved offshore into waters requiring subsea blowout preventers (BOP) and marine risers, it was no longer considered safe to use hydromatic brakes to control the huge weights involved.
		The eddy-current braking system does not depend upon water pressure to work and is not at risk in the case of burst connections.
		Moreover, the dynamic brake can handle the cyclic overloads often encountered when floating vessels heave in ocean swells.
	www.oceanstaroec.com /fame/1999/brakes.htm (165 words)

	Electric motors & motor controls engineering - dynamic brake
		Is the dynamic brake circuit (standard switch with in series a resistor limiting the maximum current) widely employed only in application where is demanded high current sinked???
		I saw a schematic, for ac motor, where the switch for the dynamic brake had to carry 2A.
		Dynamic brake circuit current ratings depend on the motor HP rating and motor voltage rating.
	www.eng-tips.com /viewthread.cfm?qid=21829 (255 words)

	Drivecon dynamic brake mods, resistors, and line regen converters
		Heavy duty NEMA class resistor ballast for high duty cycle dynamic braking.
		Large, inefficient dynamic brake resistors are not required with this energy saving line regenerator.
		Separately mounted DC shunt regulator module designed to extend braking cycles and braking power beyond the standard 20% offered by the drive itself.
	www.drivecon.com /dybrk_lr.htm (196 words)

	Mine brake system awarded :: ABC Tropical Queensland
		Having to hit the skids as you approach a unexpected quick changing light or to counteract the car in front's severe braking and avoiding an accident is a major feat in a small car.
		The operating speed can be at about 75 to 80km per hour for coal haulers and then applying the brake as hard as you can.
		They developed an entire brake testing package which was backed up by the risk assessments they did as well as evaluations by the Queensland Mines Inspectorate and Intersafe an external body that verified the mathematics behind it."
	www.abc.net.au /tropic/stories/s1710602.htm?backyard (0 words)

	AutoWeb - BMW Dynamic Brake Control Further Increases Safety
		The criteria for activating full application of the brakes are the speed with which the driver applies the brakes and the level of brake pressure applied.
		The hydraulic unit is part of the Dynamic Stability Control (DSC) system and its activation allows for the most effective application of the brakes in an emergency braking situation.
		DSC allows for the computer controlled application of brake pressure to any or all of the wheels in a manner designed to retain directional stability of the car in critical situations.
	autoweb.drive.com.au /cms/newsarticle.html?&start=105&showall=&id=BMW&doc=bmw9809221 (0 words)

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