09-11-2012, 11:56 AM
ELECTROMAGNETIC SUSPENSION
1ELECTROMAGNETIC.doc (Size: 1.66 MB / Downloads: 54)
Abstract:
Now a day’s comfort and control are two major aspects in field of design and manufacturing. At present condition spring and damper system are used as shock absorber in automobiles. As concerned to comport and control their system are lagging to provide optimum level of performance. With view of increase the comfort and control electromagnetic suspension system introduced to fulfill the requirement of modern days. This seminar intended to explain the resurgence of interest in the suspension system in recent year and outline the significant challenges that lie a head in commercializing suspension system.
Introduction:
Bose, mention that word and music comes to mind specifically, audio systems for upscale cars, as well as expensive but worth-the-cost systems for the home. Business travelers might even connect that name with noise-canceling headphones that reduce some of the stress of flying. What one doesn't associate with Bose is automobile suspension. By and large, today’s vehicle suspensions use hydraulic dampers (shock absorbers) and springs that are charged with the tasks of absorbing bumps, minimizing the car's body motions while accelerating, braking and turning and keeping the tires in contact with the road surface. Typically, these goals are somewhat at odds with each other. Luxury cars are great at swallowing bumps and providing a plush ride, but handling usually suffers as the car is prone to pitch and dive under acceleration and braking, as well as body lean under cornering .On the other end of the spectrum, stiffly sprung sports cars exhibit minimal body motion as the car is driven aggressively, as cornering is flat, but the ride quality generally suffers. In an ongoing research project that has spanned over 24 years Bose has created a unique electromagnetic suspension system for automobiles that is close to commercial release and is set to replace traditional shocks and springs with electronic actuators. "This is the first time a suspension system is the same for a sports car and for a luxury car", said its creator, Dr Amar Bose, chairman and head of technical design. The result is a ride that is level and bump free over incredibly rough terrain and when the vehicle turns in to corners.
Suspension:
The main objectives of the suspension system are:
• To prevent the road shocks from being transmitted to the vehicle parts, thereby providing suitable riding and cushioning effect to the occupants.
• To keep the vehicle stable while in motion by providing good road holding during driving cornering and braking.
• Provides safe vehicle control and free of irritating vibrations and reduce wear and tear.
Challenges:
Every automotive suspension has two goals: passenger comfort and vehicle control. Isolating the vehicle’s passengers from road disturbances like bumps or potholes provides comfort. Control is achieved by keeping the car body from rolling and pitching excessively, and maintaining good contact between the tire and the road.
Unfortunately, these goals are in conflict. In a luxury sedan the suspension is usually designed with an emphasis on comfort, but the result is a vehicle that rolls and pitches while driving and during turning and braking. In sports cars, where the emphasis is on control, the suspension is designed to reduce roll and pitch, but comfort is sacrificed. Bose engineers took a unique approach to solving this problem, and the result is an entirely new approach to suspension design.
Solution:
In 1980, Bose founder and CEO Dr. Amar Bose conducted a mathematical study to determine the optimum possible performance of an automotive suspension, ignoring the limitations of any existing suspension hardware. The result of this 5-year study indicated that it was possible to achieve performance that was a large step above anything available. After evaluating conventional and variable spring/damper systems as well as hydraulic approaches, it was determined that none had the combination of speed, strength, and efficiency that is necessary to provide the desired results. The study led to electromagnetics as the one approach that could realize the desired suspension characteristics.
Working:
The Bose system uses a linear electromagnetic motor (L.E.M.) at each wheel, in lieu of a conventional shock and spring setup. The L.E.M. has the ability to extend (as if into a pothole) and retract (as if over a bump) with much greater speed than a fluid damper (taking just milliseconds). These lightning-fast reflexes and precise movement allow the wheel's motion to be so finely controlled that the body of the car remains level.
The L.E.M. can also counteract the body motion of a car while accelerating, braking and cornering, giving the driver a greater sense of control and passengers less of a need for Dramamine. To further the smooth ride goal, wheel dampers inside each wheel hub smooth out small road imperfections, isolating even those nuances from the passenger compartment. Torsion bars take care of supporting the vehicle, allowing the Bose system to concentrate on optimizing handling and ride dynamics.
A power amplifier supplies the juice to the L.E.M.s. The amplifier is a regenerative design that uses the compression force to send power back through the amplifier. Thanks to this efficient layout, the Bose suspension uses only about a third of the power of a vehicle’s air conditioning system. There are a few other key components in the system, such as control algorithms that Bose and his fellow brainiacs developed over a few decades of crunching numbers. The target total weight for the system is 200 pounds, a goal Bose is confident of attaining.
Research Vehicle:
In many of today’s production vehicles, the suspension system is comprised of front and rear suspension modules that bolt to the underside of the vehicle. The Bose suspension takes advantage of this configuration by creating replacement front and rear suspension modules. Using this approach, the research team has been able to retrofit the Bose suspension into existing production vehicles with minimal modifications. Bose’s front suspension modules use a modified McPherson strut layout and the rear suspension modules use a double-wishbone linkage to attach a linear electromagnetic motor between the vehicle body and each wheel. Torsion springs are used to support the weight of the vehicle. In addition, the Bose suspension includes a wheel damper at each wheel to keep the tire from bouncing as it rolls down the road. Unlike conventional dampers, which transmit vibrations to the vehicle occupants and sacrifice comfort, the wheel damper in the Bose suspension system operates without pushing against the car body, maintaining passenger comfort.
1ELECTROMAGNETIC.doc (Size: 1.66 MB / Downloads: 54)
Abstract:
Now a day’s comfort and control are two major aspects in field of design and manufacturing. At present condition spring and damper system are used as shock absorber in automobiles. As concerned to comport and control their system are lagging to provide optimum level of performance. With view of increase the comfort and control electromagnetic suspension system introduced to fulfill the requirement of modern days. This seminar intended to explain the resurgence of interest in the suspension system in recent year and outline the significant challenges that lie a head in commercializing suspension system.
Introduction:
Bose, mention that word and music comes to mind specifically, audio systems for upscale cars, as well as expensive but worth-the-cost systems for the home. Business travelers might even connect that name with noise-canceling headphones that reduce some of the stress of flying. What one doesn't associate with Bose is automobile suspension. By and large, today’s vehicle suspensions use hydraulic dampers (shock absorbers) and springs that are charged with the tasks of absorbing bumps, minimizing the car's body motions while accelerating, braking and turning and keeping the tires in contact with the road surface. Typically, these goals are somewhat at odds with each other. Luxury cars are great at swallowing bumps and providing a plush ride, but handling usually suffers as the car is prone to pitch and dive under acceleration and braking, as well as body lean under cornering .On the other end of the spectrum, stiffly sprung sports cars exhibit minimal body motion as the car is driven aggressively, as cornering is flat, but the ride quality generally suffers. In an ongoing research project that has spanned over 24 years Bose has created a unique electromagnetic suspension system for automobiles that is close to commercial release and is set to replace traditional shocks and springs with electronic actuators. "This is the first time a suspension system is the same for a sports car and for a luxury car", said its creator, Dr Amar Bose, chairman and head of technical design. The result is a ride that is level and bump free over incredibly rough terrain and when the vehicle turns in to corners.
Suspension:
The main objectives of the suspension system are:
• To prevent the road shocks from being transmitted to the vehicle parts, thereby providing suitable riding and cushioning effect to the occupants.
• To keep the vehicle stable while in motion by providing good road holding during driving cornering and braking.
• Provides safe vehicle control and free of irritating vibrations and reduce wear and tear.
Challenges:
Every automotive suspension has two goals: passenger comfort and vehicle control. Isolating the vehicle’s passengers from road disturbances like bumps or potholes provides comfort. Control is achieved by keeping the car body from rolling and pitching excessively, and maintaining good contact between the tire and the road.
Unfortunately, these goals are in conflict. In a luxury sedan the suspension is usually designed with an emphasis on comfort, but the result is a vehicle that rolls and pitches while driving and during turning and braking. In sports cars, where the emphasis is on control, the suspension is designed to reduce roll and pitch, but comfort is sacrificed. Bose engineers took a unique approach to solving this problem, and the result is an entirely new approach to suspension design.
Solution:
In 1980, Bose founder and CEO Dr. Amar Bose conducted a mathematical study to determine the optimum possible performance of an automotive suspension, ignoring the limitations of any existing suspension hardware. The result of this 5-year study indicated that it was possible to achieve performance that was a large step above anything available. After evaluating conventional and variable spring/damper systems as well as hydraulic approaches, it was determined that none had the combination of speed, strength, and efficiency that is necessary to provide the desired results. The study led to electromagnetics as the one approach that could realize the desired suspension characteristics.
Working:
The Bose system uses a linear electromagnetic motor (L.E.M.) at each wheel, in lieu of a conventional shock and spring setup. The L.E.M. has the ability to extend (as if into a pothole) and retract (as if over a bump) with much greater speed than a fluid damper (taking just milliseconds). These lightning-fast reflexes and precise movement allow the wheel's motion to be so finely controlled that the body of the car remains level.
The L.E.M. can also counteract the body motion of a car while accelerating, braking and cornering, giving the driver a greater sense of control and passengers less of a need for Dramamine. To further the smooth ride goal, wheel dampers inside each wheel hub smooth out small road imperfections, isolating even those nuances from the passenger compartment. Torsion bars take care of supporting the vehicle, allowing the Bose system to concentrate on optimizing handling and ride dynamics.
A power amplifier supplies the juice to the L.E.M.s. The amplifier is a regenerative design that uses the compression force to send power back through the amplifier. Thanks to this efficient layout, the Bose suspension uses only about a third of the power of a vehicle’s air conditioning system. There are a few other key components in the system, such as control algorithms that Bose and his fellow brainiacs developed over a few decades of crunching numbers. The target total weight for the system is 200 pounds, a goal Bose is confident of attaining.
Research Vehicle:
In many of today’s production vehicles, the suspension system is comprised of front and rear suspension modules that bolt to the underside of the vehicle. The Bose suspension takes advantage of this configuration by creating replacement front and rear suspension modules. Using this approach, the research team has been able to retrofit the Bose suspension into existing production vehicles with minimal modifications. Bose’s front suspension modules use a modified McPherson strut layout and the rear suspension modules use a double-wishbone linkage to attach a linear electromagnetic motor between the vehicle body and each wheel. Torsion springs are used to support the weight of the vehicle. In addition, the Bose suspension includes a wheel damper at each wheel to keep the tire from bouncing as it rolls down the road. Unlike conventional dampers, which transmit vibrations to the vehicle occupants and sacrifice comfort, the wheel damper in the Bose suspension system operates without pushing against the car body, maintaining passenger comfort.