Table of contents
- Exhaust special Sound hobbyist
- “There is no typical BMW sound”
- Check frequencies in the sound studio
- Restriction on the racetrack: where to go?
- Euro 4: Facts 2016
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The sound of our motorcycles is no coincidence. The manufacturers work concentrated on the sound of their products and employ acoustics experts for this.
06/17/2014
The volume and sound of a motorcycle are the conglomerate of noises from all possible corners of the machine. The engine plays a role, how many cylinders it has, the firing order, the intake noise, any vibrations, materials used and so on. The exhaust is just one aspect that acoustic engineers need to consider when doing their job. And that’s not all until the final exhaust of a new bike is ready. “When designing the muffler, other aspects such as power and torque, quality and external noise and other requirements for the package have to be harmonized,” explains Michael Schmalenberger from BMW.
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He and his team take care of the sound on BMW motorcycles. The sound makes the music for them too: “It is an important emotional component of a motorcycle and therefore also a decisive factor in buying. That is why the sound is anchored as a concrete development goal for us and has become very important in recent years. “
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“There is no typical BMW sound”
The basic tone of the engine is influenced by the silencer and the intake system, thus creating the overall sound. In order to bring out the positive sound of the engine to its full advantage, mechanical noise such as rattling and howling, which can be caused by all kinds of moving parts such as pistons, gears, etc., must be kept as low as possible.
According to Schmalenberger, there is no typical BMW sound because that is not possible with a model range from single-cylinder to six-cylinder. “For each model, we define a specific, suitable target sound, the achievement of which is checked again and again during development,” says the engineer, explaining the development process.
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Check frequencies in the sound studio
The experts continue to influence the sound of the motorcycle after checking the individual frequencies in the sound studio with a number of microphones. “Then we change the noise emission by modifying certain components, for example by changing the geometry, increasing the rigidity, damping and so on,” says Schmalenberger. Of course, they always have to keep a strict eye on the money that is written into the development budget for their work.
What is particularly exciting for Schmalenberger is the collaboration with the other development groups, which is not surprising when you consider that an engine developer is much closer to performance and durability than the final sound of the motorcycle or the appearance of the silencer. Bringing all this under one roof “without just producing boring compromises requires a lot of experience, creativity and a certain amount of negotiating skills,” laughs the sound expert.
Restriction on the racetrack: where to go?
More and more racetracks in Europe are introducing stricter noise restrictions. It is becoming increasingly difficult for amateur racers to ride their converted bikes without problems. We asked IDM makers Bert Poensgen and Michael Dangries from the racing training organizer Bike Promotion for their opinion.
Bert Poensgen, General Manager MotorEvents HMP GmbH:
As a hotelier on one of the busiest motorcycle roads, the Riedberg Pass, and as a promoter of the Superbike * IDM, I come across this topic at every turn. It is clearly visible that those who cause noise and those who suffer from noise are facing each other more and more radically. As an enthusiastic motorcyclist, I myself know the feeling very well when I turn up the gas and a great sound comes out of the exhaust of my motorcycle! But I also know the plague when we are sitting in the beer garden in front of my hut and the “sound” of hundreds of motorcycles on Saturday and Sunday is really annoying with no ifs or buts. And as a resident of a racetrack, the screeching of high-revving motorcycles sounds into the living room all day and annoys those affected tremendously. You have to understand the concerns of noise-plagued residents and it is urgently necessary that we try together with all means to make it clear to those who cause noise that excessive noise can seriously damage our hobby.
The same goes for the racetrack. It will be inevitable that all those involved, including the sports authorities who set the noise levels for racing vehicles, realize that only by further reducing them and strictly adhering to these values will it be possible to find racetracks in the long term, where events and, above all, can be found Training can still carry out.
Michael Dangries, Managing Director Bike Promotion:
Unfortunately, the technical development of motorcycles and the will of society in recent years have gone in opposite directions. The sports motorcycles still get an operating license with ever higher noise levels due to completely outdated approval methods, while everywhere in the European environment there are more and more noise restrictions or these are also applied in practice. However, this discrepancy can only be resolved by the manufacturers if they understand that with ever louder motorcycles they “prevent” the use of motorcycles..
We ourselves are on the track for a healthy level of sound. For racing to arouse emotions, you need sound. But senseless noise that annoys even die-hard racetrack drivers doesn’t have to be. In order to preserve our sport, every driver should ensure that his motorcycle does not make more noise than it really needs. Otherwise, at some point we will end up without seats to drive.
Euro 4: Facts 2016
Regulation (EU) No. 134/2014 of December 16, 2013 on “Requirements for environmental compatibility and the performance of the drive unit” stipulated the binding and timely application of UNECE-R41.04 including its limit values and classification of motorcycles. Accordingly, new types of motorcycles must meet the following new requirements from January 1, 2016:
1. “Additional Sound Emission Provisions” in the speed range from 20 to 80 km / h – in this range the bikes have to become even quieter.
2. Compliance with the noise requirements in all selectable operating modes – the values must be observed in each selectable mode.
3. Prohibition of test cycle recognition – that makes software-influenced flap systems more complicated.
4. Measures that make manipulation more difficult – for example, the removal of dB killers will be made more difficult in the future and
5. Labeling of the noise values on the motorcycle to check the noise emissions, which makes the checks easier for the police.
In addition, the reduced noise limit values of UNECE-R 41.04 must be observed. These Euro 4 values represent a reduction of around 2 to 3 dB (A) compared to the previous limit values, depending on the vehicle class. Within the framework of the Euro 5 noise limit values to be set in Brussels in the future, the Federal Government will advocate a further lowering of the noise limit values.
Source: Federal Ministry of Transport
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