Aiming at the problem of moving path planning of a cellular robot on trusses in space station, a triangular prism truss is taken as the research object, and an optimized ant colony algorithm incorporating a gravitational search algorithm is proposed. The simulation results show that the path and planning time of the cellular robot can be effectively reduced when choosing truss path.
This paper presents an electromechanical hybrid model combining a driving circuit and a TWUSM. (1) A driving circuit model combining circuit components with the load-dependent equivalent circuit model is proposed to simulate the real electric network. (2) The teeth discretized method is employed to refine the contact status and interaction forces limited to the teeth space, which improves the accuracy of the rotor step response not only in the rising time, but also the steady value.
To improve the HMCVT gear shifting smoothness of the self-propelled cotton picker, the quadratic orthogonal rotation test was carried out through the HMCVT test bench and control system with engine speed, clutch oil pressure, flow control valve, load torque, displacement ratio as the influencing factors while jerk, dynamic load coefficient, speed drop, weighted acceleration RMS, frictional work as the response indexes.
In the field of oil & gas drilling engineering, the Rotary Steerable System (RSS) is very widely used in directional drilling, the whole drillstring is rotated from the surface by a hydraulically driven top drive. In this paper we analysis of the dynamic model of the Rotary Steerable System (RSS) with a single stabilizer and flex-sub and takes a method of the longitudinal and transverse bending continuous beam method to analyse the stress of RSS with the flex-sub.
Commercial greenhouses are the backbone of farming industry in the regions with arid climatic conditions. Design & implementation of the control systems are driving a major opportunity while doing the up-gradation of conventional type commercial greenhouses. The greenhouse control modules have strong interactions between its parameters, experimental results emphasized that good control system selection can provide a revolutionary increase in terms of crop yield with a minimal energy utilization.
Honeycomb sandwich (HS) structure has been widely used in aerospace applications because of its high specific strength and high specific stiffness. The structure of the lightweight HS panel is complex. Thus, establishing an equivalent simplified model is indispensable to improve the efficiency of the dynamic analysis of HS panels. In this paper, three commonly used dynamically equivalent modeling methods for HS panel are studied.
The paper highlights the importance of process parameters in the electromagnetic sheet metal forming process. Aluminium alloy I(Al6061T6) sheets with varying thicknesses were deformed by varying current, voltage and number of turns of the coil. A numerical model was also developed to predict the behaviour of the sheet under different processing conditions. The simulation and experimental results were in good agreement.
The increasing number of patients with hand disabilities after strokes or peripheral nerve injuries necessitates the continuous development of rehabilitation system devices to accelerate muscle recovery and to help patients regain the motor functions of their hands. This paper introduces the design of a hand rehabilitation system for patients who have a solitary impairment of their hand extension. The system was designed to be portable, simple, and cheap.
The main contribution of this paper is to present a kind of 2 DOF seven-bar SPM containing two five-bar spherical loops, which has the advantages of high reaction speed, accuracy rating, and rigidity. And based on the unusual actuated choices and symmetrical loop structure, an approach is provided to identify singularities and branches of this kind of 2 DOF seven-bar SPM. The proposed method is visual and offers geometric insights into understanding the formation of mobility using branch graphs.
Thickness-utilizing deployable hard stops (ThUDS) block the motion of a mechanism at a desired position. Designed to reside within the thickness of a design, they can be planar or spatial in nature. Various analyses and design techniques were developed and demonstrated using physical prototypes. ThUDS are able to successfully constrain motion, are able to carry loads, and are useable in various folding applications, including origami-based engineering.
Yuekou locks are the favorites of antique collectors and have six main types including combination locks, regular locks, pull-back locks, maze locks, multi-stage locks, and hidden-keyhole locks. The crafting of Yuekou locks is conducted in four stages: material preparation, molding, shaping, and assembling. This work introduces the historical development of Yuekou locks, summarizes the verbatim interviews, explores the production of Yuekou locks, and analyzes the structures of Yuekou locks.
The approach in this research includes data visualization and multilinear regression analysis. Multiple linear regression is a standard selection model in the world of data science. The approach turned out to be promising. However, the results reveal that the implemented technique holds a high degree of predictions, and the number of data sets is adequate. It is also observed that errors are in less concentration as the sum of squared errors is zero for every parameter.
A novel bench-scale suspension plant, using magnetorheological elastomer (MRE)-based absorbers accompanied with an adaptive and global neural-network-based tracking controller, is introduced. The global adaptive neural network is used to estimate the uncertain dynamics of the quarter-car model. An auxiliary design system was added to the controller to deal with input constraint effects, and the state was analyzed for its tracking stabilization. All the signals are global, uniform, and ultimate.