Using seismic data, logging information, geological interpretation and petrophysical it is possible to estimate the stratigraphic texture elastic parameters of a study area via inversion. As such, inversion an indispensable tool in field oil gas exploration development. However, due unknown natural factors, inversions are often ill-conditioned problems. One way work around this unknowable infor...

This chapter discusses the advantages and feasibility of using compliant actuators in exoskeletons. We designed compliant actuation for use in a gait rehabilitation robot. In such a gait rehabilitation robot large forces are required to support the patient. In case of poststroke patients only the affected leg has to be supported while the movement of the unaffected leg should not be hindered. N...

The objective of seismic imaging is to obtain an image of the subsurface reflectors, which is very important for estimating whether a reservoir is beneficial for oil/gas exploration or not. It can also provide the relative changes or absolute values of three elastic parameters: compressional wave velocity Vp, shear wave velocity Vs , and density ρ. Two ways can achieve the objectives. In approa...

Abstract The global energy demand is increasing while production from mature fields drastically reducing consequently, oil and gas industries are expanding activities into more challenging areas. inability of the traditional seismic data to properly delineate hydrocarbon reservoirs subtle features in ‘Sandfish’ field located offshore, Niger Delta informed use simultaneous elastic impedance inve...

We consider numerical solution methods for seismic impedance inversion problems in this paper. The inversion process is ill-posed. To tackle the ill-posedness of the problem and take the sparsity of the reflectivity function into consideration, an l1 norm regularization model is established. In computation, a nonmonotone gradient descent method based on Rayleigh quotient for solving the minimiz...

Dynamic models of elastic structures are derived using approximations of linear three dimensional elasticity. A model for the three dimensional motion of a nonsymmetric structure that is of use for applications to health monitoring for buildings is obtained. The symmetric version of the model is validated using laboratory acceleration data. Narrow plate equations whose derivation is based on si...

In this paper a variety of techniques to characterize the mechanical properties of polymers in the MHz frequency range based on the impedance analysis of thickness and thickness shear composite resonators will be presented. The analysis is based on inverting the impedance data of the composite resonator to find the best fit using the material coefficients of the piezoelectric resonator and atta...

Incorporating elasticity into wavefield extrapolation methods includes pitfalls that have no parallel in acoustic scenarios. First, coupled effects among the multiple elastic wave modes (which become three in the presence of anisotropy) often result in crosstalk contamination of the inverted reflectivity and earth model parameters. Second, conventional acquisition does not capture the full wave...