MACHINE ACOUSTICS

What is machine acoustics?

The field of machine acoustics deals with the noise caused by machines. The focus is often on their reduction or modification. To get an understanding of how such noises can be changed it is first important to understand what their starting point is. Therefore, the origin of such noise is explained in more detail in the following section. 

Origin:

First of all, a working process is needed to convert the energy. This is often a conversion of electrical energy into dynamic forces or moments. This is for example the case with an electric motor, which is located in a chipping machine. Multiple conversions can also occur within one machine. The electric motor drives the tool, but the interaction between tool and workpiece also generates forces (cutting forces). For this reason, various location-dependent dynamic forces act inside the machine structure. It can therefore be stated that the dynamic behavior inside the machine is superimposed by labor forces.

Effects:

This can also cause the surface of the machine to vibrate. As soon as this happens, the vibration is also transferred to the air around the machine. In concrete terms, this means that the air is pressed and compressed, which in turn can lead to a dynamic fluctuation in air pressure that spreads throughout the room. If this air pressure fluctuation is sufficiently large and in the audible frequency, we take it as noise. The intensity and tone of the sound is directly related to the amplitude and frequency of the air pressure fluctuation. The following figure shows the described mechanism of origin graphically.

Machine acoustics formation mechanism

Remedy:

Along this acoustic creation chain, machine acoustics follows the approach of eliminating the noise as early as possible. Ideally, this should be done in such a way that the disturbing noise does not occur in the first place.

Nevertheless, it can happen that no sensible or economical solution can be found for a machine that eliminates the source of a noise. In such cases, passive elements are used to reduce or absorb the noise. The noise barrier in road traffic is a typical example of this.

Machine acoustics is an interdisciplinary field. For example, it influences both structural dynamics in physics and the health perception of noise in medicine. For this reason, it cannot be regarded as a separate, independent field.

In which phases are machine acoustic analyses used?

Machine Acoustic Analyses are used in various phases of the product life cycle of machines. The following list provides a brief overview of a few typical applications in the most important phases:

Development:

At this stage a recording of the actual acoustic state can be of interest. For this purpose acoustic measurements are used. Typical questions, which are asked in this context Is the target achieved? Are further acoustic measures necessary? Such measurements can be supplemented by so-called benchmarking (comparative measurements). Furthermore, identification measurements also play a decisive role because they pursue the goal of detecting acoustic problem areas. 

Production:

In the production stage, acoustic measurements are often used for quality assurance. This requires a precisely defined measurement procedure, so that the results remain comparable and „controllable“ at a later time. By means of an update measurement, the obtained acoustic results can be incorporated into the development, especially in the calculation departments. This serves to make future predictions even more accurate. 

Application phase:

Especially in larger stationary systems, which may also represent a larger investment, the acoustic properties should not change significantly over the operating time. Supplementary measurements and their comparison to previous measurement results are therefore also useful at this point. Furthermore, potential weak points can be detected and eliminated early by acoustic measurements and their downstream FFT analysis.

The field of machine acoustics is very comprehensive and versatile. We would be pleased to offer you a specific consultation for your project. 

Our services include

  • Determination of the actual acoustic state of a machine acoustic system
  • Performance of comparative measurements (benchmarking)
  • Identification of problem areas of machine acoustic systems
  • Determination of transmission paths
  • Frequency and third-octave band analysis

Contact

HoloMetrix GmbH
Wixhäuser Str. 23
64390 Erzhausen
Germany

+49 6150 8507158

Frankfurt University of Applied Sciences Logo

FOUNDED OUT OF THE FRANKFURT UNIVERSITY OF APPLIED SCIENCES

© 2021  HoloMetrix GmbH – All rights reserved

MACHINE ACOUSTICS

What is machine acoustics?

The field of machine acoustics deals with the noise caused by machines. The focus is often on their reduction or modification. To get an understanding of how such noises can be changed it is first important to understand what their starting point is. Therefore, the origin of such noise is explained in more detail in the following section. 

Origin:

First of all, a working process is needed to convert the energy. This is often a conversion of electrical energy into dynamic forces or moments. This is for example the case with an electric motor, which is located in a chipping machine. Multiple conversions can also occur within one machine. The electric motor drives the tool, but the interaction between tool and workpiece also generates forces (cutting forces). For this reason, various location-dependent dynamic forces act inside the machine structure. It can therefore be stated that the dynamic behavior inside the machine is superimposed by labor forces.

Effects:

This can also cause the surface of the machine to vibrate. As soon as this happens, the vibration is also transferred to the air around the machine. In concrete terms, this means that the air is pressed and compressed, which in turn can lead to a dynamic fluctuation in air pressure that spreads throughout the room. If this air pressure fluctuation is sufficiently large and in the audible frequency, we take it as noise. The intensity and tone of the sound is directly related to the amplitude and frequency of the air pressure fluctuation. The following figure shows the described mechanism of origin graphically.

Machine acoustics formation mechanism

Remedy:

Along this acoustic creation chain, machine acoustics follows the approach of eliminating the noise as early as possible. Ideally, this should be done in such a way that the disturbing noise does not occur in the first place.

Nevertheless, it can happen that no sensible or economical solution can be found for a machine that eliminates the source of a noise. In such cases, passive elements are used to reduce or absorb the noise. The noise barrier in road traffic is a typical example of this.

Machine acoustics is an interdisciplinary field. For example, it influences both structural dynamics in physics and the health perception of noise in medicine. For this reason, it cannot be regarded as a separate, independent field.

In which phases are machine acoustic analyses used?

Machine Acoustic Analyses are used in various phases of the product life cycle of machines. The following list provides a brief overview of a few typical applications in the most important phases:

Development:

At this stage a recording of the actual acoustic state can be of interest. For this purpose acoustic measurements are used. Typical questions, which are asked in this context Is the target achieved? Are further acoustic measures necessary? Such measurements can be supplemented by so-called benchmarking (comparative measurements). Furthermore, identification measurements also play a decisive role because they pursue the goal of detecting acoustic problem areas. 

Production:

In the production stage, acoustic measurements are often used for quality assurance. This requires a precisely defined measurement procedure, so that the results remain comparable and „controllable“ at a later time. By means of an update measurement, the obtained acoustic results can be incorporated into the development, especially in the calculation departments. This serves to make future predictions even more accurate. 

Application phase:

Especially in larger stationary systems, which may also represent a larger investment, the acoustic properties should not change significantly over the operating time. Supplementary measurements and their comparison to previous measurement results are therefore also useful at this point. Furthermore, potential weak points can be detected and eliminated early by acoustic measurements and their downstream FFT analysis.

The field of machine acoustics is very comprehensive and versatile. We would be pleased to offer you a specific consultation for your project. 

Our services include

  • Determination of the actual acoustic state of a machine acoustic system
  • Performance of comparative measurements (benchmarking)
  • Identification of problem areas of machine acoustic systems
  • Determination of transmission paths
  • Frequency and third-octave band analysis

Contact

HoloMetrix GmbH
Wixhäuser Str. 23
64390 Erzhausen
Germany

+49 6150 8507158

Frankfurt University of Applied Sciences Logo

FOUNDED OUT OF THE FRANKFURT
UNIVERSITY OF APPLIED SCIENCES

© 2021  HoloMetrix GmbH – All rights reserved

MACHINE ACOUSTICS

What is machine acoustics?

The field of machine acoustics deals with the noise caused by machines. The focus is often on their reduction or modification. To get an understanding of how such noises can be changed it is first important to understand what their starting point is. Therefore, the origin of such noise is explained in more detail in the following section. 

Origin:

First of all, a working process is needed to convert the energy. This is often a conversion of electrical energy into dynamic forces or moments. This is for example the case with an electric motor, which is located in a chipping machine. Multiple conversions can also occur within one machine. The electric motor drives the tool, but the interaction between tool and workpiece also generates forces (cutting forces). For this reason, various location-dependent dynamic forces act inside the machine structure. It can therefore be stated that the dynamic behavior inside the machine is superimposed by labor forces.

Effects:

This can also cause the surface of the machine to vibrate. As soon as this happens, the vibration is also transferred to the air around the machine. In concrete terms, this means that the air is pressed and compressed, which in turn can lead to a dynamic fluctuation in air pressure that spreads throughout the room. If this air pressure fluctuation is sufficiently large and in the audible frequency, we take it as noise. The intensity and tone of the sound is directly related to the amplitude and frequency of the air pressure fluctuation. The following figure shows the described mechanism of origin graphically.

Machine acoustics formation mechanism

Remedy:

Along this acoustic creation chain, machine acoustics follows the approach of eliminating the noise as early as possible. Ideally, this should be done in such a way that the disturbing noise does not occur in the first place.

Nevertheless, it can happen that no sensible or economical solution can be found for a machine that eliminates the source of a noise. In such cases, passive elements are used to reduce or absorb the noise. The noise barrier in road traffic is a typical example of this.

Machine acoustics is an interdisciplinary field. For example, it influences both structural dynamics in physics and the health perception of noise in medicine. For this reason, it cannot be regarded as a separate, independent field.

In which phases are machine acoustic analyses used?

Machine Acoustic Analyses are used in various phases of the product life cycle of machines. The following list provides a brief overview of a few typical applications in the most important phases:

Development:

At this stage a recording of the actual acoustic state can be of interest. For this purpose acoustic measurements are used. Typical questions, which are asked in this context Is the target achieved? Are further acoustic measures necessary? Such measurements can be supplemented by so-called benchmarking (comparative measurements). Furthermore, identification measurements also play a decisive role because they pursue the goal of detecting acoustic problem areas. 

Production:

In the production stage, acoustic measurements are often used for quality assurance. This requires a precisely defined measurement procedure, so that the results remain comparable and „controllable“ at a later time. By means of an update measurement, the obtained acoustic results can be incorporated into the development, especially in the calculation departments. This serves to make future predictions even more accurate. 

Application phase:

Especially in larger stationary systems, which may also represent a larger investment, the acoustic properties should not change significantly over the operating time. Supplementary measurements and their comparison to previous measurement results are therefore also useful at this point. Furthermore, potential weak points can be detected and eliminated early by acoustic measurements and their downstream FFT analysis.

The field of machine acoustics is very comprehensive and versatile. We would be pleased to offer you a specific consultation for your project. 

Our services include

  • Determination of the actual acoustic state of a machine acoustic system
  • Performance of comparative measurements (benchmarking)
  • Identification of problem areas of machine acoustic systems
  • Determination of transmission paths
  • Frequency and third-octave band analysis

Contact

HoloMetrix GmbH
Wixhäuser Str. 23
64390 Erzhausen
Germany

+49 6150 8507158

Frankfurt University of Applied Sciences Logo

FOUNDED OUT OF THE FRANKFURT UNIVERSITY OF APPLIED SCIENCES

© 2021  HoloMetrix GmbH
– All rights reserved