As an automotive technology has developed more sophisticatedly, we put more emphasis on noise taken place when a vehicle is driven. From the past, the problem of a noise reduction in a vehicle interior has been crucial in NVH (Noise, Vibration, Harshness) fields. As a major focus of a vehicle is mov...
As an automotive technology has developed more sophisticatedly, we put more emphasis on noise taken place when a vehicle is driven. From the past, the problem of a noise reduction in a vehicle interior has been crucial in NVH (Noise, Vibration, Harshness) fields. As a major focus of a vehicle is moved to sensibility, the researches on this also have actively proceeded. Noise taken place in vehicles can make drivers uncomfortable, and a feeling of fatigue the drivers have can cause dangerous situations, or even car accidents.
In this paper, the vibrations and noise transferred to an interior of a vehicle through a transmission bracket were calculated, and, to reduce these, an analysis of design factor and a topology optimization were conducted. To identify a property of the vibrations with respect to excitation forces transferred from engine, a transmission and a bracket were modeled as a finite element. By using this, a modal analysis and a forced response analysis were conducted. In addition, a boundary element model is constructed based on a finite element model, and, by employing it, an acoustic power is calculated. Based on the noise calculated through the acoustic analysis, the design variables affecting the reduction of the vibrations and noise were identified. Combining the design variables, an improved model is proposed, and the results of the noise depending on frequencies decrease from 63dB to 52dB. After the design change, the tendency, that themore natural frequency of structure reduces, the lower a noise is, is discovered.
Being originated from this tendency, the topology optimization of which an objective function is to minimize the natural frequency is performed, and the topology of structure satisfying the constraints is suggested.
As an automotive technology has developed more sophisticatedly, we put more emphasis on noise taken place when a vehicle is driven. From the past, the problem of a noise reduction in a vehicle interior has been crucial in NVH (Noise, Vibration, Harshness) fields. As a major focus of a vehicle is moved to sensibility, the researches on this also have actively proceeded. Noise taken place in vehicles can make drivers uncomfortable, and a feeling of fatigue the drivers have can cause dangerous situations, or even car accidents.
In this paper, the vibrations and noise transferred to an interior of a vehicle through a transmission bracket were calculated, and, to reduce these, an analysis of design factor and a topology optimization were conducted. To identify a property of the vibrations with respect to excitation forces transferred from engine, a transmission and a bracket were modeled as a finite element. By using this, a modal analysis and a forced response analysis were conducted. In addition, a boundary element model is constructed based on a finite element model, and, by employing it, an acoustic power is calculated. Based on the noise calculated through the acoustic analysis, the design variables affecting the reduction of the vibrations and noise were identified. Combining the design variables, an improved model is proposed, and the results of the noise depending on frequencies decrease from 63dB to 52dB. After the design change, the tendency, that themore natural frequency of structure reduces, the lower a noise is, is discovered.
Being originated from this tendency, the topology optimization of which an objective function is to minimize the natural frequency is performed, and the topology of structure satisfying the constraints is suggested.
주제어
#FEM BEM NVH Topology optimization
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