The new nonlinear control technology-active disturbance rejection is introduced, and the novel unit ADRC coordinated scheme for thermal power generation proposed. key element of extended state observer (ESO). real-time dynamic linearization implemented by estimation via ESO compensation law, instead differential geometry based feedback direct theory which need accurate mathematical model plant. decoupling MIMO system boiler-turbine also easily employing ADRC. simulation results on STAR-90...

In this paper, in order to investigate the shear mechanism and capacity of framework joints steel‐reinforced concrete‐filled circular steel tube (SRCFCST), a numerical finite element model reflecting mechanical behavior SRCFCST column‐reinforced concrete beam is established through simulating by damage plastic constitutive ideal elastic‐plastic material, its effectiveness verified experimental data. On account uniform distribution reinforced around section without definite flange web,...

A comprehensive method for quantitatively appraising the safety rating of masonry structure is proposed which able to reflect difference in same level. The analytic hierarchy process (AHP), fuzzy theory, and grey clustering theory were applied based on fuzzy-grey characteristics structural factors building system. four-layer evaluation model considering its features was established by using AHP a three-level elaborated. Then, weight coefficient vector each layer calculated according expert...

Based on the elastic analysis, existing methods of importance assessment structural members can only reflect behavior. To understand plasticity and stiffness degradation structure, present study proposes a member method which takes elastic-plastic strain energy or generalized as performance parameter. First, are explained. Second, by pushover is calculated in accordance with story force-displacement curve, according to base shear-top displacement curve. Third, measured its effect structure....

The flyback type grid-connected micro inverter has received much attention because of its simple structure and electrical isolation characteristics. However, due to the nonlinear characteristics converter, a large amount harmonic currents are generated during operation process. In this paper, an inverse control method is proposed improve grid current quality inverter. mathematical model established by small signal method, major factors affecting discussed. Then system ANN proposed....

In order to make full utilization of photovoltaic (PV) array output power, which depends on solar irradiation and ambient temperature, maximum power point tracking (MPPT) techniques are employed. Among all the MPPT strategies, Perturb Observe (P&O) algorithm is more attractive due its simple control structure. Nevertheless, steady-state oscillations always appear perturbation. this paper, forecasting model (MPP) based Support Vector Machine (SVM) established, a new composed small step P&O...

Summary The life‐cycle cost‐oriented design philosophy is a promising tool for building resilient cities as it helps in gaining insights into the impact of hazard‐induced damage and repair civil infrastructure systems. In this study, socioeconomic parameter‐independent practical formulation was introduced cost analysis by combining economic loss rate associated with different limit states cloud analysis‐based probabilistic seismic demand model. A framework optimization proposed using an...

There are two types of calculation methods for the shear strength existing new-to-old concrete interface without anchor bars: considering normal stress and stress. These lack theoretical support need to improve accuracy. A unified formula that takes into account both zero has not been reported. According test failure phenomenon mechanism, mechanism a bars is analyzed. Based on three-dimensional energy yield criterion, virtual work principle and, plastic limit analysis theory, derived. The...

Subterranean floors are treated as the rigid lateral support in current practice for basement wall design. The structural performance of will be influenced by floor openings, which inevitable to satisfy building functional requirements. An analytical model being presented is able analyze effect such opening quantitatively. magnitude horizontal stiffness determined based on deformation analysis diaphragm opening area. Idealized models continuous beams with various degrees indeterminacy....

In this paper, a small photovoltaic power generation system based on micro-inverter is introduced.In order to overcome the shortcomings of stand-alone mode and grid-connected mode, an operating method presented.The parallel with single-phase grid enable operation without injection.Simulation results show that could steadily work in two different modes, improve efficiency generation, reduce impact grid.

Grid-connected solar micro-inverter is a highly nonlinear and time-varying system, so it difficult to achieve good control effect using traditional PI controller.In this paper, small signal analysis model of established, grid-connected current strategy composed fuzzy controller grid voltage feed-forward put forward, the initial parameters optimized genetic algorithm.Simulation results show that has virtues robustness, dynamic deviation, could reduce harmonic content current.

This paper aimed at an intelligent instrument. In order to control the liquid temperature, fuzzy and precompensation PID were discussed in detail. Through simulations by MATLAB practical testes, was adopted, then precise temperature achieved.