Two-phase flow CFD simulations are conducted to investigate the performance characteristics of an axial flow compressor operating under an excessive amount of water intrusion exposed to a rainy atmosphere. In order to obtain a certain compressor behavior under the water film irregularities, the blade surfaces are divided into a small number of regions depending on the film thickness. In addition, to examine the droplets interaction with rotating blades and splashing process, a self-compiled FORTRAN code has been used. The results showed that uneven roughening of blade surfaces is the effective technique to identify the deterioration in performance with irregular wall film thickness. The overall adiabatic efficiency and pressure ratio are decreased by 6% and 0.88 at a 5% water injection rate using an irregular rough wall model. Moreover, the increased wall film has adversely influenced the internal flow mechanism, which resulted the increase of passage shock intensity, entropy level within the main flow zone as well as the blade surface temperature.

All pre-stressed structures called as tensegrity structures have been introducing into robotics, modern architectural designs, and medical necessities called bio-tensegrity, space structure alternates, and many other emerging technologies because of its numerous useful properties. Six bar tensegrity ball robot structure has an essential importance in the field of robotics due to its deployable, movable, deformable, and easily controllable capabilities. This structure has 6 rigid bars (in compression) and 24 flexible strings (in tension) that are connected in such a 12 nodes arrangement that provides the highest spatial symmetrical shape to this structure among most of the tensegrity structure. In this paper, the internal forces of bars and strings on each node have been studied, and the force equation on every node has been developed. Furthermore, the balance of all bars and strings forces on the whole structure has been analytically verified to assure the structure remains statically pre-stressed under the zero net effect of all internal forces applied by bars and strings.

Michelle structure is well known due to its optimization form & minimum mass of the structure. The idea has been adopted by James C Maxwell’s result on truss design. In this paper, we have presented the simple mathematical model of Michelle structure for the basic complexity order q=2 in the two-dimensional coordinate system. This mathematical model based on the construction of a structure that includes the analysis coordinate of all Nodes, and all member location of the structure along with analysis of their Connectivity matrices; these parameters form a whole tensegrity system of Michelle structure. The force density in each member of the structure has been investigated on every single node of structure individually. The mathematical form of structure has been developed in this research, which can be helpful to develop the high order complexity structure by applying the same methodology. The selection of bars and string has been carried out in a simple way. Moreover, the expression for calculating the minimum mass of structure has been defined at the end of this paper, which is the most important factor for constructing any kind of tensegrity structure.

Tensegrity structures which are comprised of bars and strings are very lightweight structures and they have the capability to deform and remain stable. For these properties they have been utilized in various fields of engineering for various purposes. One of the potential application of tensegrities is in the area of robotics. Three bar tensegrity is a basic unit structure, the dynamics of which can be utilized for tensegrity based robots. Due to its similar geometrical shape and easy control of strings, and by the application of inward compressive load, the movement of whole robot can be controlled. In this paper, the dynamics of three bar tensegrity structure has been studied under compressive load. The mathematical model for the structure has been built; and node matrix and connectivity matrix have been defined to describe the structure. The simulation has been performed on ADAMS software to analyze the movements of bar and deformation in strings under the effect of compressive load. All the strings have been grouped according to the similar deformation experienced by them. In addition to that, compression and twisting of top layer of the structure has been investigated. The obtained results provide the base for the construction of extremely lightweight robotic structure