Seminar On BOSE ELECTROMAGNETIC SUSPENSION Report Download
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.
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.
The Bose suspension required significant advancements in four key disciplines: linear electromagnetic motors, power amplifiers, control algorithms, and computation speed. Bose took on the challenge of the first three disciplines and bet on developments that industry would make on the fourth item. The above figure shows the front module of a BOSE suspension. Prototypes of the Bose suspension have been installed in standard production vehicles. These research vehicles have been tested on a wide variety of roads, on tracks, and on durability courses.
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, regardless of the goings-on at the wheel 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.
The system draws about two horsepower or one-third the load of a typical air conditioner. While it can exert 50 kilowatts (67 horsepower) of energy to leap a 2×6(plank) covers 49 kilowatts cushioning the landing, with the shocks working like generators.
Torsion bars and shock units weigh about what two conventional springs and shocks. The controllers and upsized alternator also add some weight, but the total should be less than that of a hydraulic active suspension.
The system lets a vehicle ride lower at highway speeds to produce less drag and improve handling
To save power the system is regenerative. When the far side of a pothole helps to push the wheel up almost all the power is recovered. The motors momentarily become generators, shunting the recovered energy to storage, either in the engine battery or in some other device. The system ends up consuming one-third of the energy used by a cars air-conditioner.
Every system has some disadvantages attached to it.Some of the drawbacks can be grouped as below
The main drawback of the system is the cost.As it uses nyodinium magnets which are costly to manufacture.Thus this makes this suspension system costlier than any other suspension available.Thus this system can be seen in only high end cars
The second drawback is ,when this system breakdowns its very difficult and costly affair to repair it .The other system available can be easily be repaired
The system is very complex and requires high precision machinery and skilled workers to manufacture
For the first time, the Bose suspension demonstrates the ability to combine in one automobile a much smoother ride than any luxury sedan, and less roll and pitch than any sports car. This performance results from a proprietary combination of suspension hardware and control algorithms.