A Pareto Front Mechanism Optimization for Controlling an Aircraft Using a Bio-Inspired Rotating Empennage

This paper presents a mechanism design optimization for actuating the horizontal stabilizers of an aircraft using a rotating empennage without a vertical stabilizer. Birds do not have vertical stabilizers and rotate their tail feathers to control agile maneuvers. A rotating empennage concept will mimic this motion and enable the bio-inspired flight of a fixed wing aircraft. To maintain control, the bio-inspired rotating empennage (BIRE) will incorporate three degrees of freedom: independent rotation of each horizontal stabilizer and rotation of the empennage relative to the main axis of the fuselage. The primary benefits of an aircraft without a vertical stabilizer is reduced drag and weight, which in turn results in more efficient operation. In order to reduce inertia of the rotating empennage, the linear actuators that position the horizontal stabilizers will be placed within the fuselage. Mechanisms that couple the linear translation of the actuators with the rotation of the horizontal stabilizers ideally require a low peak force and short stroke from the actuator. With two conflicting objectives, a Pareto front optimization was conducted to determine appropriate link lengths of candidate solutions and to understand the effectiveness of alternate mechanisms. The study considers a rack & pinon, scotch-yoke, slider-crank, inverted slider-crank, Watt, and Stephenson mechanisms.

Research on Power Enterprise Supplier Management System Based on Supplier Deep Portrait

In current supplier management business status of power enterprises, exists many common pain points, such as weak supplier data management, weak risk management awareness. With the intention of solving these problems, this research proposes a deep portrait system of suppliers of power enterprises by constructing full information database of suppliers, establishing a comprehensive evaluation index system of suppliers, and building a supplier label library. With the application of this system, this paper designs the business mechanism optimization scheme of the whole life cycle auxiliary management, which includes supplier qualification and performance verification, professional performance evaluation, market performance insight and risk control. This system proposed is of great significance to improve the lean level and informatization process of supplier management in power enterprises.

Optimization of rotary conveyor swing mechanism by reducing inertial loads

The paper is devoted to solving a practical problem of the crank-rocker swing mechanism optimization of the radial-rotary conveyor, which is used for the distribution of bulk materials along the radial arc. Optimization in this case means the selection of such dimensions of the mechanisms elements, in which the moment of the resistance forces, reduced to the first element and caused mainly inertial loads arising from the swing motion of the platform with a conveyor mounted on it, are minimal. To solve this problem, first of all a kinematic synthesis of the crank-rocker swing mechanism is perform, which consists in finding the dimensions of the mechanisms elements under the conditions of synthesis (implementation of the desired motion). Next step is kinematic analysis, which determines the acceleration of the mechanisms elements on which the forces of inertia directly depend. Finally, the force analysis is perform, as a result of which the moment of the acting forces, reduced to the first element of the mechanism, is defined. On the basis of the carried-out calculations the variant of the mechanism with such sizes of elements at which the consolidated moment of resistance is minimum is chosen. As a result of optimization due to the choice of rational sizes of mechanisms elements the resistance of movement decreases and the required capacity of the conveyor swing mechanism drive is reduced.