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Topic: Slip angle

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Oversteer

Weight transfer

Drift racing

Initial D

Honda Civic

	* All Things Motorcycle * - 076: Slip Angle
		Slide angle is the angular difference between the direction inertia sends you and the direction your tires are pointing while slip angle is the angular difference between the direction your contact patch is pointed (thus, the direction the tire moves) and the direction the tire is pointed.
		That is, a slip angle is so called because the part of the contact patch that is to the outside of your turn is moving faster than the wheel itself is in the direction it (the contact patch) is pointing while the part on the inside is moving more slowly.
		The greater the slip angle, the larger portion of the contact patch that is slipping.
	www.msgroup.org /forums/mtt/topic.asp?TOPIC_ID=168 (1306 words)

	Slip angle - Wikipedia, the free encyclopedia
		In car handling, slip angle is the angle between a rolling wheel's actual direction of travel and the direction towards which it is pointing (i.e., the angle of the vector sum of wheel translational velocity v and sideslip velocity u).
		A non-zero slip angle arises because of deformation in the tire carcass and tread.
		A principal means of adjusting developed slip angles is to alter the relative roll couple (the rate at which weight transfers from the inside to the outside wheel in a turn) front to rear by varying the relative amount of front and rear lateral load transfer.
	en.wikipedia.org /wiki/Slip_angle (452 words)

	Slip - Wikipedia, the free encyclopedia
		Slips are usually caused by inadequate synchronization of the two clocks controlling the transmission or by poor reception of the signal.
		In boating, a slip is a ramp used to move boats and flying boats to and from the water.
		This slip can be generated either by the tyre's rotational speed being greater or less than the free-rolling speed (usually described as percent slip), or by the tyre's plane of rotation being at an angle to its direction of motion (referred to as slip angle).
	en.wikipedia.org /wiki/Slip (462 words)

	Tire Technology, excerpt no. 2 from The Racing & High-Performance Tire (Site not responding. Last check: 2007-10-29)
		Slip angle happens when the steering wheel is turned from straight ahead and it's the angle, "a" in the schematic, between where the tire is pointed and where the car is actually going.
		It bears repeating that it is the elastic characteristic of the pneumatic tire that allows the generation of a slip angle, and it is the forces resisting the deformation of the tire structure combined with the tread's grip on the road that allows a car to turn a corner at speed.
		The angle between the vehicle heading and the wheel heading is the slip angle.
	www.insideracingtechnology.com /tirebkexerpt2.htm (2247 words)

	Nevada Racing - Supporting Racing In All Of Nevada (Site not responding. Last check: 2007-10-29)
		This means that the rear end of the vehicle is loose, requiring less and less steering angle to keep the vehicle on the radiused path of the turn.
		Slip Angle - is the difference between the line the tires are steered on and the line they actually follow.
		The angle of tire slip can depend on vehicle speed, lateral acceleration, vertical load on tire, coefficient of friction of the rubber, and inflation of the tire.
	www.nevadaracing.com /chassis.html (1598 words)

	Vehicle turning behavior control apparatus - Patent 5206808
		Thus, a steering angle sensor 23, a brake switch 24, wheel speed sensors 25, 26, 27 and 28, a lateral acceleration sensor 29 and a lateral slip angle sensor 30 are connected to the control unit 22.
		(vehicle lateral slip angle) of the vehicle travel direction made with respect to the direction in which the vehicle is directed and it produces an electric signal indicative of the sensed lateral slip angle.beta..
		Preferably, the lateral slip angle sensor 30 is of the type employing two non-contact speed sensors (doppler sensors) 301 and 302 positions at 45 degrees with respect to the vehicle longitudinal axis, as shown in FIG.
	www.freepatentsonline.com /5206808.html (5571 words)

	VBOX Products
		This is calculated from the direction of motion of the primary antenna, and is derived from the primary components of the doppler velocity (north velocity and east velocity).
		The Slip Angle Sensor can be used toprovide measurements for lane change manoeuvres, steady state cornering tests, trailer angles relative to the towing vehicle and any test involving speed, distance, acceleration, slip, roll or pitch angles.
		In competitive sailing, the slip angle or leeway is normally a very difficult parameter to measure, as it requires a precise measurement of the direction a boat is pointing relative to the direction of travel.
	www.racelogic.co.uk /?show=VBOX-Products-Slip_angle_sensor (895 words)

	[No title]
		The horizontal axis indicates Alpha(Outer), which is the angle between the centreline of the car, and the direction of travel of the outer-wheelprint.
		A steering geometry that generates large dynamic-toe-out angles will cause the inner-wheel of the car to develop a larger steer-angle, and slip-angle, than the outer-wheel, whenever a large steering movement is made, and the car is still travelling straight-ahead (see the "Static-Toe" section, and Figure 2).
		An important observation to be made of Figures 5, 6, and 7 is the size of the angle Alpha(T) between the steer-arm and the track-rod, and its effect on the dynamic-toe curve.
	students.washington.edu /dennyt/fsae/zapletal/Toe/TOEBYZAP.TXT (7059 words)

	Tony Foale Designs, article on motorcycle tyre characteristics and how they work. (Site not responding. Last check: 2007-10-29)
		The angle between the direction of the tyre and the tangent to the curve is known as the 'slip angle'.
		But, because the camber angle of the bike is determined by the need to balance the machine for a given speed around a given corner, it is unlikely that in all cases will the camber thrust be of exactly the correct amount.
		The required lean angle varies as the angle of sliding changes (rear wheel slip angle), the reason for this can be seen in fig.5.
	www.tonyfoale.com /Articles/Tyres/TYRES.htm (2463 words)

	Method for determining variables characterizing vehicle handling - Patent 5557520
		By contrast, it is known from German Patent document DE 36 08 420 C2 to determine the side slip angle on the basis of measured variables with the aid of a vehicle model and on the basis of vehicle parameters.
		A further method, which determines the side slip angle on the basis of the measured values of steering angle, vehicle velocity, yaw velocity and wheel speeds, as well as a value of lateral acceleration which is estimated using a measured value of the lateral acceleration, follows from German Patent document DE 42 00 061 A1.
		In this case, the measurement of the roll angle velocity is carried out, for example, with the aid of a rotational speed sensor having its measuring axis aligned in the vehicle longitudinal direction, which is also used to measure the yaw velocity.
	www.freepatentsonline.com /5557520.html (2789 words)

	TURNING FLIGHT AND SIDESLIP IN HANG GLIDERS (Summary)
		In all cases the slip is said to be a temporary event because of the inherent yaw and pitch stability of the glider.
		A slipping turn describes a circle in space, just as any other turn, but the nose of the aircraft is always pointing toward the outside of the circular flight path, and the airflow against the "slewed" fuselage and other components of the aircraft generates forces that slow the turn rate.
		The decrease in the slip angle is caused by yaw rotational inertia as the nose tends to keep swinging toward the low wingtip at a high rate.
	www.vvhga.org /steve_paper2.html (20451 words)

	Tire Model in Driving Simulator
		The longitudinal and lateral forces generated by a tire are a function of the slip angle and longitudinal slip of the tire relative to the road.
		The longitudinal slip of the tire is defined as a difference between the tire tangential speed and the speed of the axle relative to the road, which is represented by the following equation.
		Given the polynomial saturation function in Equation 10 and lateral and longitudinal stiffness, the normalized lateral and longitudinal forces are derived by resolving the composite force into the side slip angle and longitudinal slip ratio components.
	code.eng.buffalo.edu /dat/sites/tire/tire.html (901 words)

	Slip Angles and Handling (Site not responding. Last check: 2007-10-29)
		Slip angle is a term used to describe a particular type of flex in tires.
		Slip angle is a measurement of how much the tire's contact patch has tw isted (steered) in relation to the wheel.
		It is not uncommon for this slip angle to be as large as 6 to 10 degrees on the race track.
	www.auto-ware.com /setup/slp_hndl.htm (644 words)

	Definition of tyre Slip Angle
		Slip angle is the angular difference between the direction the tyre contact patch with the road is pointing and the direction of the wheel (figure 1, below).
		Therefore, it should be apparent that if the slip angles for the front and rear tyres are the same (the tyres front and rear are generating similar levels of grip), the car will steer essentially as if there was no slip angle at all (neutral cornering).
		Slide angle is the angular difference between the direction inertia sends you and the direction your tyres are pointing while slip angle is the angular difference between the direction your contact patch is pointed (thus, the direction the tyre moves) and the direction the tyre is pointed.
	www.mgf.ultimatemg.com /group2/suspension/chassis_and_handling/slip_angle.htm (716 words)

	Comparison of Optical and RT3000 Slip Angle
		So investigating the slip angle performance is a good place to start when assessing the overall performance of the RT3000.
		The existing instruments, optical slip sensor, yaw rate sensor, accelerometers and steering wheel angle, were already connected to the acquisition system and modification to acquire the RT3000 at the same time was simple.
		The green shows an approximation to Slip Angle calculated using a yaw rate sensor and lateral accelerometer; this approximation is often used to combat the bandwidth problems of the Optical sensor.
	www.oxts.com /default.asp?pageRef=33 (998 words)

	Automotive Engineering International Online: Tech Briefs, Sep. 1999, Page 5
		Slip angle—the angle between the direction a tire is pointed and the direction it is moving.
		Understeer—a cornering condition in which the front slip angle is greater than the rear slip angle.
		Oversteer—a cornering condition in which the rear slip angle is greater than the front slip angle.
	www.sae.org /automag/techbriefs_9-99/05.htm (1453 words)

	HyperTryke Lifting Body Concept Landyacht
		Angle of attack must be kept below stall angle (about 33 degrees) and side force below 0.8 G's (80% of vehicle weight) while keeping the acceleration gage needle green, in the positive region.
		This angle is known as the slip angle...
		At a few degrees of slip, equivalent to moderate-high cornering accelerations (the slip angle of a cruising landyacht), the rolling resistance coefficient may more then double in magnitude." Vertical load on the tire, tire type and ground surface conditions will affect the slip angle.
	www.sevenravens.com /landsailing/hypertryke (1000 words)

	Angular acceleration of car - GameDev.Net Discussion Forums (Site not responding. Last check: 2007-10-29)
		If you are using curves to represing slip angle vs force and the like, you will use the tire forces to determine the rotation of the vehicle.
		This should build up the slip ratio in the rear tires so that they also create a force to the left (so all 4 tires are pushing towards the inside of the radius of curvature, otherwise you wouldnt change direction!).
		The tires are delivering a bit too much force at greater slip angles, maybe twice as much as they are supposed to since I implemented the force proportional to the slip angle.
	www.gamedev.net /community/forums/ViewReply.asp?id=2333782 (2018 words)

	Blazer Rear
		The slip yoke function is retained and a CV incorporated onto the shaft.
		FRONT or REAR: Lifts between 6 inches higher or when the angle at the transfer case output exceeds 12-14 degrees or when the vehicle is built for lots of articulation where the CV may bind at full extension.
		The higher the angle the bigger the CV that is used.
	www.arizonadrivelines.com /blazer_rear_drive_shaft.htm (801 words)

	DrEdEd22Understeer
		Simply stated, the Slip Angle is the difference in direction between where your tires are pointing, and where your car’s momentum is taking it.
		Understeer is represented by large slip angles, oversteer by small or even negative slip angles (counter-steer).
		four-wheel drift, the slip angle is actually very close to zero because we have used proper cornering technique to set the car on the desired path.
	www.homestead.com /redlinerennsport/DrEdEd24SlipAngle.html (1766 words)

	WK11411- Test Method for Obtaining Measurements with Portable Variable Angle Strut Slip Resistance Meters
		This class of SRM is portable by design, and uses a test foot that is in motion when it strikes the surface during testing for the purpose of measuring the slip resistance of the interface.
		The SRM applies horizontal and vertical forces simultaneously, and the ratio of horizontal to vertical force is increased until a slip occurs.
		This is a non-proprietary standard for obtaining slip resistance measurements by a class of tribometers that has an actuated foot that is used to measure slip of surfaces.
	www.astm.org /DATABASE.CART/WORKITEMS/WK11411.htm (243 words)

	Pacejka magic formula not alll that magical? - Live for Speed
		Aligning torque is what straightens a tyre once it is twisted (slip angle) and it also resists the tyre from being twisted further.
		Because the change of slip angle is influenced by aligning torque...
		You assume that the aligning torque is a major factor in determining the current slip angle.
	www.lfsforum.net /showthread.php?t=7720 (4016 words)

	Grip vs. Drift - The How and Why to Understanding Slip Angle Dynamics - DRIFTING.com
		Becuase of the fact that you only want a bit of slip in a straight line, at corner exit you dont want to have the rear tires hanging out, but you do want to have the car rotated which is the whole point of drifting.
		With HICAS (four-wheel steering), the same principle applies except the slip effect isn't as diagonal and it is moreso starting from the back and heading to the front of the contact patch.
		My conclusion is that, in reference to the idea in the beginning of this writeup about slip angle under complete grip (along the contact patch), small amounts of drift essentially help straighten out this contact patch thus increasing lateral traction therefore allowing for tighter steering angles.
	www.drifting.com /forums/showthread.php?t=7820 (3800 words)

	Slip rings, Rotary Joints, Ring, Transmission system, Systems, Schleifring, Joint, Electrical slip
		Obviously the quality of the slip ring is a key determinant in the quality of the overall system.
		For continuous rotation of 360 ° slip rings or rotary joints are required.
		Besides contacting slip rings for the transfer of low data rates more and more non-contacting rotary joints are used, especially for the transmission of digital data at high bit rates.
	www.schleifring.com (858 words)

	Grassroots Motorsports and Classic Motorsports :: View topic - School me on slip angle.... (Site not responding. Last check: 2007-10-29)
		Slip angle is the angular difference between the steer angle of the tire and and the actual path of the vehicle.
		Some tires grip well with a very high degree of slip angle (think rally cars on gravel-the tires are designed to work at these slip angles), others don't (look at F1 cars, they don't look like they are sliding until you look very close).
		Finding that slip angle 'window' in which a tire grips at it's best is what separates the men from the boys.
	www.grmotorsports.com /board/viewtopic.php?t=15151 (988 words)

	RC Aircraft Proving Grounds - Aerodynamic Center Stability Definition
		In the above movie we see that the initial tendency for the aircraft once the slip angle changes is to return to the original slip angle.
		Positive static longitudinal stability means that initially the aircraft tends to return toward the original angle of attack once disturbed.
		The aircraft is actually stable and would return to the original speed and angle of attack if the computer didn't interfere.
	www.geistware.com /rcmodeling/articles/aerodynamics/stability.htm (586 words)

	Ford Motor Company - Press Release - Understanding the terms of driving dynamics
		The angle between the direction a tire is pointed and the direction it is moving.
		A cornering condition in which the front slip angle is greater than the rear slip angle.
		A cornering condition in which the front and rear slip angles are equal.
	media.ford.com /newsroom/release_display.cfm?release=1569 (670 words)

	Angular Slipping in Spondylolisthesis - Wheeless' Textbook of Orthopaedics
		in pts who have a 50 % slip and is always present in pts w/ 75 % slip;
		- angle that is formed by extending a line along anterior border of body of L5 until it intersects
		- slip angle is measured by drawing a line perpendicular to line drawn along posterior aspect of first
	www.wheelessonline.com /ortho/angular_slipping_in_spondylolisthesis (152 words)

	Geophysical confirmation of low-angle normal slip on the historically active Dixie Valley fault, Nevada
		A recent geologic study of surface rupture characteristics in southern Dixie Valley suggests that the Dixie Valley fault is low angle (<30°) along a significant portion of the 1954 rupture.
		Current fault motion postdates a 13 to 15 Ma basalt, imaged in the hanging wall, and inherits from a fault formed during an earlier extensional pulse, concentrated at 24.2 to 24.4 Ma.
		The earlier extension suggests extraordinary slip rates as high as 18 mm/yr, resulting in the formation of the low-angle fault break.
	www.agu.org /pubs/crossref/2001/2000JB900385.shtml (411 words)

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