Experimental study on improving the noise and vibration characteristics of electric brake systems using order analysis

In this study, the occurrence of driving noise and vibration was analyzed through an understanding of the driving mechanism of an electric brake system, and research was conducted to derive insights into improving the noise, vibration, and harshness performance. Because a brake system consists of very complex parts, accurately determining the dynamic characteristics of the entire system is often difficult, but it is a crucial process. Therefore, the noise frequency generated during brake operation should be checked, and operational deflection shape information of the corresponding frequency band should be obtained. Through this, correlation can be confirmed by comparing the noise with the vibration level of each component. Additionally, order analysis using a color map is performed to understand the relationship between the rotational excitation of the motor and the system's response. When this rotational excitation component excites the natural frequency of the system, the response of the system increases. Thus, resonance may be avoided by changing the dynamic characteristics of the main vibration component, causing the natural frequency to move. Experimental results were verified through theoretical analysis of the motor and ball screw of the driving part.