Magnetorheological (MR) materials are classified as smart materials due to their responsiveness to external magnetic stimuli. Intensive research on MR materials has led to broad applications in several potential fields. A solid carrier matrix state called MR elastomer with its exceptional magnetic responsive feature is obtained by merging magnetizable particles within an elastomeric polymer. This integration results in outstanding characteristics on the rheological performances. Special prominence is given to the understanding of the base materials and fabrication as well as the functional behavior through various characterization methods. Broad applications of MREs are also explored to provide a profound market picture and to motivate researchers to develop novel technology. The functional behavior of MREs is briefly explained. The art of the materials provides the current position and mapping of the matrix and filler particles. Types of matrix and particles are mentioned together with the level of the research interest on MREs. Description of the fabrication is provided in simple diagrams as summarized from previous works to enhance the MREs performance. The possible tests to reveal the characteristics of the MREs are delivered with the global experimental setup. The review also explains the applications of MREs as well as discussion on the MREs future promising applications.

Recent Progress on Magnetorheological Solids: Materials, Fabrication, Testing, and Applications†

A hydraulic control system for controlling at least one load (1; 30, 40), the respective load pressure as a load-sensing signal via a respective load-sensing line (LS - that as a means for influencing a load-sensing signal, a compensator (10) is present, a corrected load sensing signal (LS - that the compensator (10) consists of a compensation valve (11) and a shut-off valve (12), - that the compensation valve (11) comprises a pressure applied to it load-sensing pressure (p - that the shut-off valve (12) shuts the compensator (10) when at the compensation valve (11) pending load-sensing pressure (p

A hydraulic control system

Optimization of performance of Combined Solar Collector-Geothermal Heat Pump Systems to supply thermal load needed for heating greenhouses

Recent research and applications of ground source heat pump integrated with thermal energy storage systems: A review

Influence of composition of carbonyl iron particles on dynamic mechanical properties of magnetorheological elastomers

The diffusion-improved ant colony optimization (DIACO) algorithm, as introduced in this paper, addresses the slow convergence speed and poor stability of the ant colony optimization (ACO) in obstacle avoidance path planning for quadruped robots. DIACO employs a nonuniformly distributed initial pheromone, which reduces the blind search time in the early stage. The algorithm updates the heuristic information in the transition probability, which allows ants to better utilize the information from the previous iteration during their path search. Simultaneously, DIACO adjusts the pheromone concentration left by ants on the path based on the map information and diffuses the pheromone within a specific range following the artificial potential field algorithm. In the global pheromone update, DIACO adjusts the pheromone on both the optimal path and the worst path generated by the current iteration, thereby enhancing the probability of ants finding the optimal path in the subsequent iteration. This paper designs a steering gait based on the tort gait to fulfill the obstacle avoidance task of a quadruped robot. The effectiveness of the DIACO algorithm and steering gait is validated through a simulation environment with obstacles constructed in Adams. The simulation results reveal that DIACO demonstrates improved convergence speed and stability compared to ACO, and the quadruped robot effectively completes the obstacle avoidance task using the path planning provided by DIACO in combination with the steering gait.

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The Quadruped Robot Uses the Trajectory Planned by DIACO to Complete the Obstacle Avoidance Task

The design and analysis of a new type of three-jaw docking mechanism capable of space rendezvous and docking are presented. In addition, a composite docking test platform capable of both vertical and horizontal docking is created. On the basis of kinematics theory, a global coordinate system is built, and the attitude error is assessed based on the error angle. On the basis of dynamic theory, the multi-body dynamic differential equation of the composite docking platform is derived, and the impact-induced interaction state of the locking pawls is studied. The simulation software is then used to jointly simulate the test platform and the docking mechanism under the two conditions of frontal and oblique docking, and to analyze the attitude law caused by the change of docking impact force. This provides a solid foundation for future research into the application of space rendezvous theory to small spacecraft.

/pdf/attitude-error-and-contact-influencing-characteristic-2ykfkrjl.pdf

Attitude Error and Contact Influencing Characteristic Analysis for a Composite Docking Test Platform

The quadruped robot is subject to self and external interference during the running process. In this paper, in order to improve the stability of the quadruped robot, a disturbance suppression strategy based on the kinematic model and the virtual model is proposed. Through the whole-body kinematics modeling of the body, the cause of the disturbance is analyzed. At the same time, two spring-damping virtual elements are introduced on the body. The virtual force generated by the spring-damping model is according to the displacement and speed of the CoM (center of mass) when the robot is moving. By simulating the tort gait of the robot, sorting out the data obtained from the experiment, and drawing a comparison curve with the experiment results of the no spring-damping virtual element under the same conditions, it is proved that the method proposed in this paper has a significant effect on maintaining the dynamic stability of the body, and the actual trajectory is not different from the theoretical trajectory.

/pdf/suppression-of-quadruped-robot-body-disturbance-by-virtual-6vqvfpw8.pdf

Suppression of Quadruped Robot Body Disturbance by Virtual Spring-Damping Model

During the heavy-duty vertical lathe work and the system operation, due to the workbench oil film friction and the self-generated heat will be transmitted to the workbench through the contact surface between oil film and workbench, make workbench temperature distribution uneven and produce large thermal deformation which can affect the machining accuracy. The article on different locations of the workbench Reinforcing plate temperature field simulation analysis, based on heat transfer theory and the actual working conditions, calculating the workbench of the convective heat transfer coefficient and the initial boundary conditions, analyzing the simulation results, it reveals the influence of reinforcing plate arrangement to the workbench temperature distribution law, and get the best position of reinforcing plate on the heavy-duty vertical lathe workbench. These study results would provide a theoretical basis for the structural design of the workbench.

http://onlinepresent.org/proceedings/vol31_2013/14.pdf

Junpeng Shao

Papers

The Quadruped Robot Uses the Trajectory Planned by DIACO to Complete the Obstacle Avoidance Task

Attitude Error and Contact Influencing Characteristic Analysis for a Composite Docking Test Platform

Suppression of Quadruped Robot Body Disturbance by Virtual Spring-Damping Model

Influence of Temperature distribution of Reinforcing plate arrangement on the Heavy-duty Vertical Lathe Workbench