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In order to study the influence of suspension time delay on the vehicle, the 1/4 semi-active suspension system with time delay was taken as the research object. The stability condition of the time-delay system was used to solve the stability interval of the adjustable damping. For the case outside the stability interval, the critical time delay point was solved, and the numerical simulation was carried out under the discrete impact road surface. The results show that when the time delay is reasonably selected in the stability interval, the ride comfort and handling stability can be improved. When the stability interval is outside, the time-frequency analysis of the suspension performance index is carried out by selecting the critical point of time delay and the nearby points. When the time delay is less than the critical time delay point, the system remains stable. When it is greater than the critical time delay point, the system diverges and is unstable, and the ride comfort and handling stability of the vehicle deteriorate. With the increase of time delay, the power of the suspension performance index gradually increases, and the power of the suspension performance index in the low frequency band is significantly greater than that in other frequency bands.
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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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