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Why AERODYNAMICS are so important? In the design of a modern vehicle the external shape of its body plays a key role. To move forward a vehicle must overcome the resistance of the air; this resistance depends on the external design of the vehicle. The ease with which a vehicle moves in the airflow is indicated by the product of its front surface and the aerodynamic coefficient Cx -a non-dimensional aerodynamic coefficient of resistance, determined by the exterior of each vehicle-. Aerodynamics also affect passenger comfort: the design conditions the shape of the coach and, thus, the interior ventilation and the aerodynamic noise inside the passenger compartment. As for vehicle stability, largely influenced by the vehicle's aerodynamic movements, this aspect is optimised as we explain in the following section. As one of the determining factors for saving fuel, reducing noise and optimising the stability of the DIVO, HISPANO has worked in close collaboration with the firm Pininfarina and the INTA (Spanish National Institute of Aerospace Technology) to achieve what is probably the best aerodynamic coefficient ever for a Luxury Touring Coach.
Minimising
vibrations and noise level In
most cases, the greatest problem with vibrations and noise occurs when
the dynamic forces exerted on the structure alter its natural
frequencies. By
means of insulating the problematic parts and modifying the mass of
critical elements so that the resonance and excitation frequencies are
different, HISPANO has developed a reliable and versatile system for the
reduction of vibrations and noise, with the introduction of chemical
additives that optimise the damping coefficients of visco-elastic
materials. Another
important aspect is the close collaboration that chassis manufacturers
and first component suppliers have offered us to resolve all possible
sources of dynamic irregularities. Passive safety As one of the main objectives of the project, the safety of the crew compartment has been maximised to increase the structural rigidity of this area 30% in comparison to conventional coaches. Thanks to this new design, the vehicle is able to absorb front-side impacts in emergency situations. Another feature is that there is no driver's door on the left side and that the driving position is extra-elevated to enhance the aforementioned features.
A step ahead of the norms From
the very beginning of the project HISPANO's R+D department has analysed
the current legal framework and future trends in the sector to define a
vehicle which complies with the strictest requirements laid down by
official approval bodies.
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The
excellent aerodynamic coefficient is complemented by the level of
soundproofing of the engine unit, and low noise level in normal running
conditions, achieving excellent general driving dynamics.
It
is well known that HISPANO was the first company in Spain to receive the
Reg. 66 EC certification (behaviour of the structure in the event of
rollover). In this new model, a system of protective rings provides a
practically non-deformable space for maximum passenger safety, using new
materials, which allow the weight of the body and the way that it
behaves in emergency situations, to be optimised.
These
norms are, amongst others: > The 96/36/EC, 96/37/EC and
96/38/EC directives referring to seat anchorage and passenger
safety systems (safety belts, safety belt attachment and seat
design).