智能网联汽车OTA升级安全设计

随着汽车行业快速向智能化、网联化、电动化的方向发展,车载电子器件(ECU)在整车系统中逐渐增多,整车和ECU已经实现从物理方式到软件升级(OTA)的更新迭代。当前针对汽车的黑客攻击事件频发,OTA功能作为智能网联汽车的重要功能,也成为黑客的重点攻击对象。攻击者通过劫持、篡改、替换等攻击方法对智能网联汽车OTA升级链接发起攻击。文章基于当前智能网联汽车OTA升级架构进行安全分析,通过设计安全的OTA升级方案,提升整车OTA升级的安全性。     

Experimental study on dynamic response of a floating offshore wind turbine under various freak wave profiles

This study performed experimental investigation on the dynamic response of an in-place floating offshore wind turbine (FOWT) under freak wave actions. Based on the method of wave profile modulation, various freak wave profiles embedded in unidirectional Gaussian seas were generated in wave basin and the action of these waves on the FOWT was measured and analyzed, which has not been done before. The motions of FOWT were analyzed in time domain as well as time-frequency domain. The effect of freak wave parameters on FOWT motions was addressed, i.e., freak wave height, freak wave period, large crest, and deep trough. The dynamic response of FOWT was observed as a spike at the occurrence of freak wave in a conventional random wave, where the impact of freak wave can last for 17 spectral peak periods of wave. Data analysis shows that the motions of FOWT increased linearly with the freak wave height. In addition, the occurrence of freak wave induced the coupled effect on surge and pith, which was strengthen with the increase of freak wave height and wave period. Compared to a large crest, a deep trough of freak wave led to stronger motions and was supposed to be a key concern on the safety of the FOWT. The novel findings in this study provided a reference for the design of survival load on a FOWT and benchmarks for validating numerical models.