Significance Origami has been employed to build deployable mechanical metamaterials through folding and unfolding along the crease lines. These structures are flexible in their deployment direction so that they can be easily collapsed same path deployed. Here we create an origami-inspired metamaterial with on-demand deployability selective collapsibility: autonomous from state collapsibility two different paths, low stiffness for one substantially high another path. The created yields...

In this paper, a novel dynamic sliding mode control scheme is proposed for class of uncertain stochastic nonlinear time-delay systems represented by Takagi-Sugeno fuzzy models. The key advantage the that two very restrictive assumptions in most existing approaches have been removed. It shown closed-loop system trajectories can be driven onto surface finite time almost certainly. also stability resulting motion guaranteed terms linear matrix inequalities; moreover, sliding-mode controller...

Abstract In this study, a hybrid dynamic model of high-speed thin-rimmed gears is developed. model, the translational and angular displacements (including rigid vibration displacements) with total six degrees-of-freedom (DOFs) are selected as generalized coordinates for each gear, meshing force distributions along contact line between teeth considered. Thus, can be implemented under stationary nonstationary conditions. The condensed finite element models (FEMs) developed centrifugal inertia...

The Experimental Advanced Superconducting Tokamak (EAST) is planned to run 1000 s plasma discharges in the near future. In this steady-state operation, data acquisition system (DAS) will be required continuously acquire diagnostic signals, transfer from digitizer front-end servers order that retrieved by experimenters real-time. Another disadvantage current systems consist of many devices which are connected through various cables provide requested functionality. A study has been launched...

A dynamic model of multiple-stage planetary gear train composed a two-stage and one-stage parallel axis is proposed to be used in wind driven generator analyze the influence revolution speed mesh error on load sharing characteristic based lumped parameter theory. Dynamic equation solved using numerical method uniform distribution system. It shown that property system significantly affected by rotational speed; coefficient change rate internal external meshing are obvious difference from each...

To evaluate the internal adaptations of cast crowns made from resin patterns produced using three different computer-aided design/computer-assisted manufacturing technologies.A full-crown abutment zirconia was digitized an intraoral scanner, and design crown finished on digital model. Resin were fabricated a fused deposition modeling (FDM) 3D printer (LT group), light projection (DLP) (EV or five-axis milling machine (ZT group). All in cobalt-chromium alloy crowns. Crowns traditional...

A thermal energy storage system using U-tube heat exchanger is proposed and compared with the single-tube exchanger. Based on enthalpy-porosity method, three-dimensional numerical models computational fluid dynamics approach are developed to simulate dynamic melting of phase change material in two systems. Variable specific technique combined conduction–convection transfer applied achieve precise simulation. The model first validated published data, then, flux across tube used evaluate...

As the dedicated equipment in electricity measurement, high-accuracy metering is an essential feature of electronic power meter. In actual various factors will affect accuracy energy system. Among them, phase shift introduced by current transformer important cause for measurement error, especially case a light load. The existence this phenomenon directly fairness and justice all commercial transactions market. With regard to matter, effective digital calibration algorithm based on piecewise...

Dielectric elastomer actuators have gained extensive attention in scientific and industrial communities with the rapid development of soft robot technology. There still remain some questions on control aspect nonlinear system dielectric actuator. The first is whether actuator can successfully drive primary structure to track an arbitrary prescribed trajectory. second how suppress random vibration around equilibrium position when disturbed by external excitation. This article seeks answers...

A combined assessment method based on Probability Theory and Evidence was proposed to evaluate the power quality for wind plant. This adopted an improved estimate every sample index, which guaranteed objectivity preciseness in measured data acquisition initial process. The D-S also introduced information fusion of different experts process index weight, made result more objectively exactly, abated force experts' subjective factors.

We first investigate the fundamental properties of mechanical system as related to control design. Then a new robust is proposed for systems with fuzzy uncertainty. Fuzzy set theory used describe uncertainty in system. The desirable performance deterministic. deterministic and not usual if-then rules-based. resulting controlled uniformly bounded ultimately proved via Lyapunov minimax approach. design systematic able render performance. A chosen demonstration.

The piezoelectrically-actuated stick-slip nanopositioning stage (PASSNS) has been applied extensively, and many designs of PASSNSs have developed. friction force between the surfaces plays a critical role in successful movement stage, which influences load capacity, dynamic performance, positioning accuracy PASSNS. Toward solving influence problems force, this paper presents novel where flexure hinge-based adjusting unit was employed. Numerical analysis conducted to estimate static...