43 results about "Explicit model" patented technology

A stereo calibration method is proposed to calibrate an interface's shape and position when the measurement system is in one media and measures deformation and strain of an object that is submerged in a different media. After the interface's shape and position are modeled by parameters, an explicit model of object points as measurement is established taking account of refraction happening at the interface. Efficiency and convergence are assured by using measurement of object points to acquire initial estimates for refraction angles at the interface. Then, an optimization method is performed to get the optimized value of interface parameters. Last, based on the resulting interface parameters, 3-dimensional positions of object points in all the subsequent measurement could be reconstructed accurately. Therefore, the distortion induced by refraction in the measurement is corrected. Numerical simulations of the proposed calibration process confirm that it is both robust and accurate for a range of experimental conditions, even in the presence of Gaussian noise in the measurement.

Methods for creating and using space-time surrogate models of subsurface regions, such as subsurface regions containing at least one hydrocarbon formation. The created surrogate models are explicit models that may be created from implicit models, such as computationally intensive full-physics models. The space-time surrogate models are parametric with respect to preselected variables, such as space, state, and / or design variables, while also indicating responsiveness of the preselected variables with respect to time. In some embodiments, the space-time surrogate model may be parametric with respect to preselected variables as well as to time. Methods for updating and evolving models of subsurface regions are also disclosed.

The invention discloses a predictive control method for knee joints of active above-knee prostheses, and relates to control on knee joints. The predictive control method includes steps of collecting required basic information data of experimenters in an offline manner and generating data reports; building modules of piecewise affine systems for knee joint movement of lower limb prostheses; convexly partitioning state regions of the systems according to control performance indexes to obtain control laws; controlling online control procedures of strategies. The predictive control method has the advantages that the models of the piecewise affine systems are built for the lower limb prostheses of human bodies, explicit model predictive controllers are created and can be used for carrying out closed-loop control on the prostheses, information can be exchanged between the controllers and external environments in real time, accordingly, the control precision can be improved, and the safety of products can be guaranteed; model building work and optimization problem solving programming procedures are carried out in offline procedures, only table lookup and simple computation need to be carried out during online control, accordingly, energy consumption of processors can be reduced, and the predictive control method is favorable for improving the endurance of the products.