[问答]

从基于LSM6DSL的车辆RPM技术仪表恢复的振动数据中应用的FFT无法读取中频值

问答对人有帮助，内容完整，我也想知道答案 0 大家好！我们正在开发基于LSM6DSL的车辆RPM技术仪表，STM32L431KCU6微控制器以80 Mhz的速度运行。我们的目标是通过对从中收集的单轴振动数据应用FFT F（max）来读取RPM LSM6DSL 加速度计的范围为F = 20 Hz至200 Hz。此处附有双层PCB板的图片供您参考。 FFT的设置是设置：ODR = 6000 Hz，FFT样本= 256，幅度= 200mg，满量程= + -2g 接收的FFT F（max）值是25Hz，50Hz，76Hz，101Hz，127Hz，并且不像连续的25,26,27,28，但在两个连续值之间得到近似25Hz的分辨率而我们从基于MEMS加速度计的市售RPM技术仪表中获得连续范围内的Fmax值，因此我们无法将车辆的加速器保持在车辆所需的RPM以用于车辆测试目的。请使用如果我们犯了一些错误或建议我们错在哪里，建议FHz范围为20Hz到200Hz的最佳FFT参数设置。 https://community.st.com/tags♯/?tags=vibration https://community.st.com/tags♯/?tags=mems%20accelerometer 我希望我们为这样的应用选择了正确的ST MEMS部件，或者建议新的另一个。提前致谢！谢谢和最诚挚的问候， VK Verma #mems-accelerometer #vibration 以上来自于谷歌翻译以下为原文 Hi to All ! We are working on LSM6DSL based vehicle RPM Techno-meter with STM32L431KCU6 micro controller running at the speed of 80 Mhz. Our target is to read RPM by applying FFT F(max) on the single axis vibration data collected from LSM6DSL accelerometer from the range of F = 20 Hz to 200 Hz.The picture of the double layer PCB board is attached herewith for your reference. The Setting for FFT are Settings: ODR = 6000 Hz, FFT Samples = 256, Magnitude = 200mg, Full scale = +-2g FFT F(max) values received are 25Hz, 50Hz, 76Hz, 101Hz, 127Hz and not like 25,26,27,28 in continuous but getting with approximate resolution of 25Hz between two consecutive values whereas we are getting Fmax values in continuous range from one of the commercially available RPM techno-meter based on MEMS accelerometer and due to this we are unable to hold the accelerator of the vehicle at the desired RPM of the vehicle for vehicle testing purposes. Please suggest the best FFT parameter settings for the Fmax range of 20Hz to 200 Hz if we are making some mistake or suggest where we are wrong. https://community.st.com/tags♯/?tags=vibration https://community.st.com/tags♯/?tags=mems%20accelerometer I hope we have selected right ST MEMS part for such application or suggest new another one. Thanks in advance! Thanks and Best Regards, VK Verma #mems-accelerometer #vibration 0
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答案对人有帮助，有参考价值 0 您能否分享您的FFT结果和预期RPM的图片。如果您获得多个一次谐波频率（在您的情况下为25Hz，应该是1500 RPM），我认为这是正确的。以上来自于谷歌翻译以下为原文 Can you please share picture of your FFT results and expected RPM. I think it is correct if you get multiple of first harmonic frequency (25Hz in your case, which should be 1500 RPM).

2018-10-19 11:31:42 评论举报曾玲娟

答案对人有帮助，有参考价值 0 你好Miroslav，在我们的观察中，我们得到的RPM大约是F max的30倍，这就是为什么25Hz接近750 RPM并且在车辆转速计中观察到的相同。现在请帮助我们在两次连续读数之间减少25 Hz因数，这样我们就能达到+/- 10 rpm的RPM分辨率。非常感谢您的支持。谢谢，敬意， VK Verma 以上来自于谷歌翻译以下为原文 Hi Miroslav, In our observation, we are getting RPM which is roughly 30 times of F max and that is why 25Hz is close to 750 RPM and the same is observed in the vehicle tachometer. Now please help us to reduce 25 Hz factor between two consecutive readings so that we will be able to achieve RPM resolution of +/-10 rpm. Your support will be highly appreciated. Thanks and Best regards, VK Verma

2018-10-19 11:49:54 评论举报李丽