On the Geodetic Feasibility of Mars with VLBI Observables from Mars Probe
Based on the observation of Mars probe with ground VLBI, the observation model including the position of Mars probe and connection parameters of reference systems is studied in this paper, and the estimable parameter sequence is determined. Then the adjustment method appropriate for rank defect in the matrix of normal equation coefficients is studied, the model parameters are calculated and their precisions are evaluated. Thirdly, the impact of accidental errors to the parameters is analyzed. The results are given at the end of the paper.
Simulated Computation of Geodetic Parameters with Space VLBI Observations
The meaning to research the potential of space VLBI for geodetic applications is summarized.The observation types of space VLBI are investigated,and so are the observation models and their related parameters of geodetic interest.With the world wide VLBI data from 1980~2004,the conditions to compute the parameters of geodetic interest are introduced,and so are the computing methods and processes.And the computed results of the parameters of geodetic interest are analyzed.
Three-dimensional elasticity problems for the prismatic bar
A general solution is given to the three-dimensional linear elastic problem of a prismatic bar subjected to arbitrary tractions on its lateral surfaces, subject only to the restriction that they can be expanded as finite power series in the axial coordinate z. The solution is obtained by repeated differentiation of the tractions with respect to z, establishing a set of sub-problems . A recursive procedure is then developed for generating the solution to from that for . This procedure involves three steps: integration of the stress and displacement fields with respect to z, using an appropriate Papkovich–Neuber (P–N) representation; solution of two-dimensional in-plane and antiplane corrective problems for the tractions in that are independent of z; and expression of these corrective solutions in P–N form. The method is illustrated by an example.