Industry Status:
Existing solution: The motor vibration and noise test is to build a dedicated online silent room to isolate and reduce external noise, place the motor in the silent room, and collect and analyze the sound signal of the motor to obtain the sound pressure signal, and the vibration and noise of the motor The size is judged, or the noise heard is judged by human subjectiveness.
The existing scheme is a traditional online noise test method, which requires a lot of cost to build an online silent room. The environmental noise in the silent room should be below 30dBA, which puts forward higher requirements for the design of the silent room. Due to the relatively large noise on the industrial site, The cost of building a high-standard online silent room is relatively high, and the noise reduction effect is limited.
Product overview and advantages:
Our product provides a new method for detecting the vibration and noise of the electric seat motor of the automobile, which can test and judge the vibration and noise of the motor without the need of a silent room. Vibration acceleration sensor, signal processing device and data analysis software are used. Through data analysis software, the collected acceleration signal, voltage and current are collected, and the vibration acceleration signal is analyzed to obtain the amount of noise and give the data analysis result. Out of judgment.
The vibration signal is the main carrier of the noise characteristic information of the seat transmission components. The seat vibration signal is collected by the vibration signal acquisition device to obtain the time domain signal. We take the vibration signal of the motor running as the research object, and perform analog and digital signal processing on it. Analysis, on the basis of analyzing the mechanism of motor vibration and noise, the relationship between motor vibration and noise is deduced, so as to achieve the purpose of judging noise characteristics through vibration.
Related standards:
GB/T 18488 Motors and controllers for electric vehicles
product structure:
The electric seat vibration test system is applied in the factory workshop. After the industrial computer sends an instruction to start the detection system, the detection system is started, and the seat vibration information is sent to the LabVIEW software detection system after the sensor and the signal conditioning module. The vibration test system is composed of a signal processing module, a time domain analysis module, a frequency domain analysis module, and a frequency response analysis module. After a series of analyses on the received signal, the current vibration is qualified or not. At the same time when the system is started, the corresponding storage module will establish a detection data folder through the SQL Server database in the specified location, and store the vibration signal data in the form of a table after processing, which is convenient for subsequent viewing and failure. Detection. The test results can be transmitted to the manufacturing system at the same time, and data exchange can be carried out with the manufacturing system, so as to achieve the purpose of controlling product quality in the process.
振动加速度信号时域波形
Vibration acceleration signal peak energy
Historical data query and analysis