二阶欠阻尼系统固有角频率为<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/7a7b835efe4447368ecf82ae1a5a3623.png?x-oss-process=image/sharpen,200"/>，阻尼比为<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/8089f3194a734d0abfd51def88f1701c.png?x-oss-process=image/sharpen,200"/>，在激振力消失后将作衰减周期运动，其<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/33f28ebc4fd24df09636fee353f7ec1a.png?x-oss-process=image/sharpen,200"/>与<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/e76bbae4fb334218b67655ffaff6bf36.png?x-oss-process=image/sharpen,200"/>和<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/8e834900a91944849ee1796dcdd25e9f.png?x-oss-process=image/sharpen,200"/>的关系为。