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

To the phenomenon of vibration seriously in the process of grinding tiles with the polishing head, the study on the affection of oscillating mechanism was carried out in this paper. The 3-D model of the oscillating mechanism was built in SolidWorks. The motion characteristics of the mechanism was simulated and analysed in the COSMOSMotion based on the simplfied model of the 3-D model. The simulation results show that the motion law of the active oscillating rod is just opposite with the passive oscillating rod and the velocity curve of the active oscillating rod is not smooth at all with large fluctution at the maximum and minimum values. Optimization of the cam profile curve is needed to enhance the oscillating mechanism's kinematic accuracy and improve the properties of the polishing head.

Kinematic simulation of polishing head oscillating mechanism based on COSMOSMotion

Exhaust valve is a key component of the high temperature steam booster pump, whose structure has direct influence on the performances of the high temperature steam booster pump. In order to improve the performances of the pump from structural optimization design, a new type of exhaust valve is designed. The thermal deformation filed of the new type of exhaust valve is simulated by using ANSYS and compared with the thermal deformation field of the traditional exhaust valve. Simulation results show that the thermal deformation value of the new type of exhaust valve is smaller than the thermal deformation value of the traditional exhaust valve and satisfies the design requirement, which provides the valuable theoretical basis for the exhaust valve in the practical production and the performance improvement of the high temperature steam booster pump.

Research on the thermal deformation field of exhaust valve for high temperature steam booster pump based on ANSYS

Based on computational fluid dynamics, friction lubrication theory and hydrostatic technology, large size hydrostatic Guide-way of heavy vertical CNC lathes,which are widely used, was taken as research object. The control equation of hydrostatic guide-way’s interstitial fluid was established. By finite volume method, lubricating oil properties, boundary conditions such as constant flow inlet, outlet pressure, and wall were set. The velocity distribution of hydrostatic thrust bearing’s interstitial fluid was obtained through iterative computations. And influence rules of cavity depth on interstitial oil-film of large size hydrostatic Guide-way’s was discussed. The results reflect hydrostatic bearing’s internal fluid flow state .and provide theoretical basis for the design of practical engineering hydrostatic bearing.

Relationship on Oil Cavity Depth and Oil film Flow State of the Large Size Hydrostatic Guide-way

In order to improve the rigidity performance of the hydrostatic thrust bearing, an electro-hydraulic pressure servo system is proposed to adjust oil film pressure in real-time. A rapid prototyping method is adopted to identify the model of the pressure servo system. A non-linear hybrid controller is applied, which is composed of a classical PID controller and a fuzzy controller based on self-adjusting modifying factor and a fuzzy switching mode is employed to reject undesirable disturbances caused by the switchover between the two control methods. The identification model of the practical system and the feasibility of the control scheme are validated by hardware-in-the-loop simulation experiments. The experiments results show that the hybrid PID controller exhibits high bearing rigidity (the maximum overshoot is 0.07, while PID is 0.2), improves stability and rapidity when load changes. Further, the control performance can be enhanced through matching the load rigidity and mass reasonably; and it is feasible to apply electro-hydraulic pressure servo system to hydrostatic thrust bearing.

Hardware-in-the-loop simulation of electro-hydraulic pressure servo system

Based on lubrication theory and computational fluid dynamics, build finite element model of lubricating oil film of hydrostatic bearing with multiple oil pads, carry on analysis calculation for temperature field of hydrostatic bearing with multiple oil pads adopting finite volume method. Under variable viscosity, aiming at different return oil groove width on the premise of the same depth, carry on numerical simulation for oil film of hydrostatic bearing with multiple oil pads, using general fluid finite element software CFX, and discuss the influence of return oil groove width on temperature rise when hydrostatic bearing with multiple oil pads work at a constant speed under constant inlet flow rate, analysis results indicate that distribution law of three-dimensional temperature field of oil film basically is identical under different return oil groove width, temperature rise of hydrostatic bearing with multiple oil pads is little affected by return oil groove width.

Junpeng Shao

Papers

Kinematic simulation of polishing head oscillating mechanism based on COSMOSMotion

Research on the thermal deformation field of exhaust valve for high temperature steam booster pump based on ANSYS

Relationship on Oil Cavity Depth and Oil film Flow State of the Large Size Hydrostatic Guide-way

Hardware-in-the-loop simulation of electro-hydraulic pressure servo system

Research on influence of return oil groove width on temperature field of hydrostatic thrust bearing with multiple oil pads