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high interoperability, rapid developing process, well performance verification and enough product uncertainty design. RCDP has clear advantages compared with other single discipline design method, i.e.

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Taking full advantage of inherent interface of commercial design software or developed medial file, RCDP can exchange information, access public data and verify the design variables dynamically within different disciplines so as to achieve the performance-based optimization with reliability constraint. Upload the local designed parameters that are related to upper level, we can solve the bi-level optimal design problem through establishing the appropriate objective function and constraint. Since system parameters are not necessarily deterministic, the probabilistic design is exploited to guarantee the system performance both in structural strength and reliability in lower level of product design. The central idea of RCDP is to decentralize the complex system into several subsystems, in which the propagation of designed parameters as well as shared parameters are considered throughout the multilevel hierarchy and the integrated optimization can be achieved with distributed optimization. This paper presents a reliability-based collaborative design platform (RCDP) for hydraulic actuation system wherein the reliability design and reliability analysis are implemented in whole design process.

Keywords: robust optimization info-gap model semidefinite program structural optimization successive linearization method + Department of Urban and Environmental Engineering, Kyoto University e-mail: # Department of Urban and Environmental Engineering, Kyoto University e-mail: 1. It is shown, in numerical examples, that optimum designs of various trusses can be found without any di#culty. A sequential semidefinite programming method is proposed which has the global convergent property. By using a semidefinite relaxation technique, we reformulate the present problem to a nonlinear semidefinite programming problem. Under the uncertainties of external forces based on the info-gap model, the maximization problem of robustness function is formulated as the optimization problem with infinitely many constraint conditions.

A robust truss optimization scheme, as well as an optimization algorithm, is presented based on the robustness function.

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