This paper deals with the problem of the instability regions of a free-free uniform Bernoulli beam consisting of two concentrated masses at the two free ends under the follower and transversal forces as a model for a space structure. The follower force is the model for the propulsion force and the transversal force is the controller force. The main aim of this study is to analyze the effects of the concentrated masses on the beam instability. It is determined that the transverse and rotary inertia of the concentrated masses cause a change in the critical follower force. This paper also offers an approximation method as a design tool to find the optimal masses at the two tips using an artificial neural network (ANN) and genetic algorithm (GA). The results show that an increase in the follower and transversal forces leads to an increase of the vibrational motion of the beam which is not desirable for any control system and hence it must be removed by proper approaches. Manuscript profile

This paper deals with an assembly of articulated piping titled Marine Loading Arm (MLA). The MLA is developed to transfer liquids and gasses between jetty and ship in order to load or unload cargo such as cryogenic or high temperature products, and the most corrosive or hazardous products. The purpose of this work is to automate the conduction of a self-supporting MLA balanced via two single adjustable counterweights by means of a simple and practical approach. The proposed strategy complies with the specifications advised by the Oil Companies and International Marine Forum (OCIMF) and industry requirements. This strategy employs a geometric method to determine the appropriate voltage value to drive the hydraulic actuators, which in turn enables safe and rapid control of the MLA from the berth to the coastal tanker flange. Furthermore, validation of the results is performed utilizing the motion simulation in ADAMS software. Finally, the electro-hydraulic circuit diagram for the actuator movement is suggested. Manuscript profile