| 摘要 |
The present invention relates to a data sampling method: sampling a physical quantity according to a sampling frequency fs = fsh, fsh = ?max/e, being the upper limit of the sampling frequency; and a data sampling method and system: sampling a physical quantity with a sampling frequency satisfying Nyquist theorem, firstly performing low-pass filtering on an obtained sampling sequence, and then resampling, the resampling frequency fs = ?max/e, where e is the Z-domain error of a sampling system, and ?max is the maximum error of an S-domain. The present invention also relates to a parameter identification method and system which firstly adopt the above data sampling method and system to obtain sampled data, and then utilize the sampled data to perform dynamic and/or static parameter identification. The data sampling method and system and the parameter identification method and system in the present invention solve technical difficulties such as relatively large errors in sampled data, numerical control instability, and parameter identification failure. |
