Full
Outline
In response to challenges in monitoring the full‑life degradation state of dry gas seals and insufficient research on vibration signals，a condition monitoring method for dry gas seals based on vibration acceleration signals is proposed.Through dynamic analysis and COMSOL simulation，the mechanism of sealing performance degradation caused by the reduction in dynamic pressure groove depth is revealed.A dry gas seal test rig is built to collect vibration acceleration data under different rotational speeds （1 000~2 500 r/min），pressures （0.15~0.25 MPa），and groove depths （8，6，4，2 μm），simulating the full‑life degradation process.A condition monitoring model based on support vector data description （SVDD） is established.This model trains hypersphere parameters using healthy data to enable online detection of degraded data.The results show that the root mean square （RMS） value of axial vibration acceleration at a groove depth of 2 μm increases significantly compared to that at 8 μm.Within a certain parameter range，the RMS value of axial vibration acceleration is positively correlated with rotational speed and negatively correlated with pressure and groove depth.The SVDD model can identify degradation trends at an early stage （groove depth of 6 μm），enabling failure warning.This study provides technical support for the intelligent monitoring and health management of dry gas seals.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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