- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | CHEN Rong, CONG Jianli, GAO Mingyuan, WANG Yuan, WANG Ping. Using Smartphone to Detect Vehicle Running Quality and Its Coordinate Alignment[J]. Journal of Southwest Jiaotong University, 2022, 57(4): 830-839. doi: 10.3969/j.issn.0258-2724.20200756
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As there is angle deviation between the car body coordinate system and smarphone coordinate system, a systematic correction method for the smartphone coordinate alignment is proposed to make smartphone sensor data truly reflect the vibration acceleration of the vehicle body. This method corrects the smartphone vertical acceleration according to gravity direction, and the smartphone horizontal acceleration by means of the orthogonality of the lateral and longitudinal acceleration of the vehicle body. The maximum likelihood principle is used in the estimation of angular deviation to ensure the reliability of smartphone angle correction. Field test results indicate that the detection data of two smartphones obtained a vertical angle deviation of 0.008° and 0.007° relative to gravity direction, the horizontal angle between both smartphones is 29.75°, and the deviation from the test placement angle 30.00° is 0.25°. The amplitude and main frequency of the vehicle body acceleration respectively detected by the smartphone and the high-precision sensor are consistent in time domain and frequency domain.
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