Development of Acoustic Design for Lexus LFA Engine by Yamaha
Yamaha will display its Acoustic Design for engine of the Lexus LFA during the 41st Tokyo Motor Show which begins today. The concept behind designing this acoustic work was to utilize sound as a communication medium linking the driver and vehicle. This design concept was based on two main goals; one to create an engine sound that reacts instantly to even delicate changes by the driver during the vehicle’s operation, and second was to effectively convey all of the high grade engine sound to the driver as acoustic properties where individuals expect form mass-produced super sports car such as Lexus LFA. In this acoustic design the engine is viewed as the generator of sound and the automobile as a medium in conveying sound from one place to another.
This design comes with two advantages. First is the ability to hold down noise under the normal driving conditions like driving in the city. The other advantage is an outstanding response in engine sound during strong acceleration. In this design, Yamaha used the surge tank as part of the intake system for radiating sound, where vibration mode of this tank was controlled by optimizing thickness, rib configuration as well as other aspects. For example when the accelerating the engine at around 3,000 rpm, the driver would hear a powerful harmonic sound structure centered around 250Hz, which is primary component of combustion tone. At the high engine speed of around 6,000rpm, the harmonic sound structure would be centered around 500Hz which would produce a sound that is rich and smooth. Additionally, Yamaha through this design for even higher engine speed would further increase the number of higher frequencies to create a sound that clearly reflects how the engine speed is increasing. The new design will make the vehicle to be equipped with a composite sound conveyance device capable of maintaining balance in the volume and frequencies of sound from the engine while at the same time effectively guiding sound which is radiated by the surge tank into the vehicle’s interior allowing the driver to enjoy sound with a spatial quality as an integral part of the vehicle.
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[...] Yamaha Motor Corporation is putting its latest developed electric powered commuter vehicles on display during the 41st Tokyo Motor Show. Yamaha latest development was based on promoting the concept of Light, Smart, Clean and Silent. Yamaha has achieved this through a slick design which featuring simplicity plus a futuristic styling to accommodate people of all ages regard less of their riding experience. The first in line-up is the EC-03 with a permanent magnet type synchronous motor with a rated output being equivalent to 50cc license category at less than 0.6 kW. It comes with a slim electric power unit and lithium-ion battery on a lightweight aluminum frame. The new EC-03 inherits Yamaha’s exclusive motor control technology contributing to a smooth start-up and acceleration. Built-in charger system on EC-03 provides a easy recharging from a home electric outlet. [...]