基座作为连接设备和平台底板的结构，需在满足设备安全可靠运行的前提下，抑制平台底板振动激励传递。目前对于基座减振优化大多是针对基座单体或基座-底板结构，综合考量设备、基座和平台底板振动特性关系的研究较少。首先，以超深水半潜式钻井平台用典型设备的长基座为研究对象，采用阻抗分析和优化设计技术，以关键频段的平台底板输入功率流控制为设计目标。其次，在保证基座满足支撑强度、刚度且基座的结构形式不变的前提下，以基座质量和刚度为设计变量，对基座各板厚进行改进。建立了“设备-基座-底板”耦合振动控制优化设计模型，选用权重线性递减的粒子群算法为优化算法，并对基座实例开展减振优化设计。有限元方法验证结果显示，技术流程可行，且在1 ~ 300 Hz低频范围内优化后的平台底板输入功率流降低了95.43%，振动加速度总响应级降低了18.1 dB，为平台设备基座设计提供了一条可资借鉴的技术途径。

The vibration excitation transmission of the platform should be suppressed while ensuring the safe and reliable operation of equipment. Currently, most research on vibration reduction focuses on individual pedestals or pedestal-platform plate structures, with few studies comprehensively considering the relationship between equipment, pedestal, and platform bottom plate vibrations. ultra-deep water semi-submersible drilling platform equipment's long base was taken as the research object and impedance analysis and optimization design technology was utilized to control input power flow of the platform bottom plate in key frequency bands. Design variables such as mass and stiffness were optimized to improve base plate thickness while maintaining support strength and stiffness. A coupling vibration control model for "equipment-pedestal-platform" was established, using a particle swarm optimization algorithm with linear weight decline for optimization. Finite element method verification results show that this technical process is feasible, reducing optimized input power flow by 95.43% in low frequencies below 300 Hz and decreasing total response level of vibration acceleration by 18.1 dB.