In this article, thermal characteristics and tribological properties of a disk-type magnetorheological fluid–based brake are investigated under various operating conditions such as different working gaps. order to achieve goal, theoretical analysis the heating heat dissipation is first performed then transient temperature behaviors through simulation works associated with finite element method. Subsequently, an experimental apparatus established measure distributions function time....

In this article, wear and friction characteristics of a magnetorheological (MR) fluid were studied under different magnetic fields. Using pin-on-disc tribometer, the loss coefficient obtained with without field. The three typical materials field investigated at various normal loads rotating speeds. After tests, worn surfaces specimens observed using scanning electron microscope (SEM) in order to investigate mechanisms, contacting analyzed by energy-dispersive X-ray spectroscopy (EDS)...

The aim of this work is to investigate the effect small magnetorheological fluid gap on braking performance brake. In article, theoretical analyses output torque are given first, and then operating principle design details brake whose can be altered presented discussed. Next, magnetic circuit proposed conducted further followed by a magnetostatic simulation brakes with different sizes gap. A prototype fabricated series tests carried out evaluate stability, as well verification results....

A new test method of reciprocating magnetorheological polishing was presented and designed, the mechanism micro-removal characteristics were analyzed. According to experimental setup, preparation process proportion fluid studied. On basis analyzing composition each component, working parameters prepared tested. With it method, experiments borosilicate glass (K9) carried out. The results show effectiveness practicability method.

In this study, nano-diamond (ND) and MoS2 powder are used as additives in a carbonyl iron-based magnetorheological fluid (MRF) to improve its tribological performance. MRFs prepared by dispersing 35 wt.% of CI particles silicone oil adding different proportions (0, 1, 3, or 5 wt.%) ND additives. Seven kinds made tested using reciprocating friction wear tester under normal loads, then the characteristics evaluated analyzing experimental results. The morphological properties contacting...

Recently, high internal surfaces for titanium alloy pipes have been required due to the increment of various applications such as aerospace components. In this work, vertical magnetorheological polishing (VMRP) is carried out achieve performance on surface pipe. A series comparative experiments were conducted investigate mechanism (MRP) fluid and enhance performance. It shown from experimental results that VMRP method under opposite polarity arrangement improves roughness 47.85% 83.34% by...

In this study, a novel magnetorheological (MR) polishing device under compound magnetic field is designed to achieve microlevel of the titanium tubes. The process realized by combining rotation motion tube and reciprocating linear head. Two types excitation equipment for generating an appropriate are outlined. A series experiments conducted systematically investigate effect strength, speed, type concentration abrasive particles on performance delivered device. were carried out through...

Recently, a high internal surface of the titanium alloy pipe is required due to increment various applications such as aerospace. However, traditional machining process unable effectively polish slender pipe. Thus, vertical magnetorheological polishing (VMRP) apparatus carried out in this work implement performance on The realized by combination rotating motion and reciprocating linear head. Moreover, series comparative experiments are conducted investigate mechanism (MR) fluid enhance...

In investigating magnetorheological (MR) brakes, it is well known that the braking torque important factor in structure’s design and temperature of MR fluid brake required to be within operating range. addition, stress condition component changes obviously combined effects force thermal load which may result structural damage. This study aims propose a multi-cylindrical with high-torque investigate more comprehensively multi-field simulation. To achieve this goal, mathematical model...

This paper presents a new constitutive model of high particles concentrated magnetorheological fluids (MRFs) that is based on the hexagonal close-packed structure, which can reflect micro-structures under magnetic field. Firstly, particle dynamic simulations for forces sustained by carbonyl iron powder (CIP) MRFs are performed in order to investigate chain-forming process at different time nodes. Subsequently, according force analyses, differs from existing single-chain structure and...

A novel magnetorheological polishing process is devised to polish the internal surface of titanium alloy tubes. Under magnetic field in area between tube and head, fluid gets stiffened acts as tool. In this process, rotation motion reciprocating linear head are carried out simultaneously resulting helical trajectory abrasive particles on workpiece surface. The finishing forces during including normal indentation force shear analyzed modeled. Based proposed model, final roughness Ra model...

In order to investigate the finishing effect of magneto-rheological fluid on specimen surfaces under magnetic field, a pin-on-disc apparatus was used carry out experiment different test conditions. Obtained results showed that effective reduce surface roughness steel conditions ensure high removal rate, but brass and aluminum specimens became considerably harsh. The decreased with increasing field. Moreover, empirical model proposed capable fitting reflecting influence experimental

In order to eliminate internal cracks and other defects of billet caused by improper secondary cooling water distribution for a small caster, mathematical heat transfer model continuous casting has been presented solved finite volume method. For calibrating better, the surface temperature measured using high resolution CCD measurement system, which can effective influence randomly generated oxide scales measurement. Then, existing problems have discussed each zone optimized at key speeds. A...

This paper proposes a novel constitutive model of magnetorheological polishing fluids (MRPFs) to predict field-dependent properties such as yield shear stress. First, the invasion particles carbonyl iron particle (CIP) chains is analyzed in terms destructive effect on distance and enhancement chain structures. Subsequently, hexagonal close-packed structure (MRFs) utilized formulate MRPFs after examining reconstructed proportional property affected by particles. According model, several...

Traditional surface polishing methods are no longer able to meet the ultra-precision requirements of high-tech industry for inner pipe, but magnetorheological technology is very suitable due its advantages high precision, fast controllability and good deposition stability. However, there even less investigation on microforce analysis, chaining mechanism micromodeling fluid (MRPF), MRPF has not been explored yet. As a step completely develop (MRP) technique, this paper proposed simulation...

Purpose This paper aims to develop a new magnetorheological polishing (MRP) device with roller and investigate the mechanism of MRP fluids using this device. Design/methodology/approach The principle process is discussed, then structure designed in detail. experiments K9 glass are carried out roller. Findings A series tests performed evaluate effect excitation gaps, working gap time on characteristics, optimized parameters can be obtained. surface roughness Ra sample reduced from 359 38 nm...