Abstract. In pneumatic systems, the airflow circuit is both a driving source and carrier of pressure, flow, other information elements. response to relying on electronic sensors controllers achieve closed-loop control in theory proximity sensing self-feedback drive was proposed control. Based principle sensing, new sensor designed studied. The structure optimized using ANSYS software, achieved by increasing pressure at feedback port as object approached. A grasping grasper designed....

Abstract Magnetorheological fluid, as a novel intelligent composite material, possesses unique controllable properties in the presence of magnetic field, thereby opening up new possibilities for its engineering applications. In this study, parametric model is proposed to accurately describe nonlinear hysteresis behavior magnetorheological fluid composed micron-scale carbonyl iron particles. Experimental investigations involving large-amplitude shear tests, employing strain amplitudes 10% and...

This paper aims to analyze the effects of combined working coils magnetorheological (MR) absorber on shock mitigation performance and verify controllability MR as applied in recoil system a field gun. A physical scale model gun is established long-stroke with four-stage parallel electromagnetic designed apply separate current each stage generate variable magnetic distribution annular flow channel. Based dynamic analysis firing stability conditions gun, ideal force-stroke profiles at...

The paper reports an investigation on a semi-active/passive integrated vibration isolator utilizing magnetorheological elastomer (MRE) and spring.To overcome the main shortcoming of passive isolation system, i.e. lack adaptability, (SAPII) based MRE spring is designed prototyped.The magnetic circuit optimized by finite element analysis to fully unlock unique feature MRE.The dynamic response characteristic SAPII experimentally investigated under sweep frequency test.A model system established...

Two experiments were conducted to determine digestible energy (DE), metabolizable (ME), as well the standardized ileal digestibility (SID) of crude protein (CP) and amino acids (AA) in 10 sorghum samples fed pigs. In experiment 1, 22 crossbred barrows (Duroc × Yorkshire Landrace, Initial body weight [BW]: 70.0 ± 1.8 kg) selected allotted a replicated 11 3 incomplete Latin square design, including basal diet diets three consecutive periods. Each period had 7 d adaptation 5 total feces urine...

In recent years, rehabilitation robots have been developed and used in training for patients with hemiplegia. this paper, a robot variable damping is designed to train hemiplegia recover upper limb function. Firstly, magnetorheological joint damper (MR damper) the robot, its structural design dynamic model are tested theoretically experimentally. Secondly, simplified into spring-damping system, controller human movement designed. The dynamically adjusts excitation current according feedback...

This paper studies the dynamic rheological behaviors of magnetorheological (MR) gels containing different CIP weight fractions suspended in polyurethane (PU).

The purpose of this study is to provide a convenient optimization design method for magnetorheological torsional vibration absorbers (MR-TVA) suitable automotive engines, which damper matching that takes into account the needs engine operating conditions. In study, three kinds MR-TVA with certain characteristics and applicability are proposed: axial single-coil configuration, multi-coil configuration circumferential configuration. magnetic circuit model, damping torque model response time...

In order to investigate the multiphysics in recoil process of magnetorheological damper, independent three-stage damper double rod has been designed. The gel with carbonyl iron powder mass fraction 70% (MRG-70) prepared and steady-state shear test was carried out for obtaining consistency coefficient k non-Newtonian index n Herschel–Bulkley model. MRG-70 applied motion analysis part by combining law chancing bore resultant force a certain type fixed artillery. Results theoretical numerical...

A magnetorheological absorber is capable of actively adapting any gun recoil condition by means controlled Coulomb force. The objective multi-coil with individual input currents to mitigate the peak force transferred buffer structure during bullet firing, and thus increase structural fatigue life. This article investigates various cases applying random combinations magnetic coils. impact tests were conducted obtaining analyzing force, displacement, velocity. As a reference, equivalent...

Shock loads can pose a great threat to personnel or instruments, and efficient control of the buffering process is an effective means reducing damage from shock energy. In this paper, magneto-rheological grease was used as internal controllable material buffer address turbulence settling problems conventional fluid. A bending folding back magnetic circuit proposed, simulation verified. The corresponding dynamic mechanical model established, response characteristics under impact load were...

Abstract Traditional upper limb rehabilitation robots have several disadvantageous. For example, they can only conduct training along predetermined trajectories, their safety systems are unreliable, and lack the ability to adjust or train affected based on expected torque of human body. To overcome these limitations, this study proposes a flexible system for joint utilising magnetorheological (MR) fluid. MR damper inverters offer significant advantages, including high torque, rapid response,...

The purpose of this study was to solve the problem that damping rubber or silicone oil torsional dampers used in crankshafts is not adjustable and cannot effectively control vibration at different resonant frequencies. Based on controlled rheological properties magnetorheological (MR) smart materials, designed a new type variable MR damper (MRTD) proposed semi-active method crankshaft under multiple harmonic resonances. First, mechanical model MRTD lumped parametric mass system were...

In this paper, the magnetorheological (MR) absorber with multi-stage parallel coil structure is designed, which can realize various magnetic field variations through working combination to meet different impact applications. To analyze influence of distributions on mechanical characteristics MR and provide a theoretical basis for subsequent open-loop control strategy, coupling simulation analysis test are carried out in paper. Based COMSOL Multiphysics software, conjugate heat transfer model...

To reveal the transient temperature distribution pattern inside magnetorheological grease (MRG) torsional vibration damper and explore relationship between current internal of device, simulation analysis MRG device was conducted in this study. Firstly, a theoretical heat transfer model with dual source structural feature established based on Bingham constitutive temperature-dependent viscosity characteristic MRG. Then, field developed by finite element method, temperature–time variation...

In order to overcome the problem of positioning inaccuracy caused by nonlinear hysteresis piezoelectric actuators, a hybrid model based on least-squares support vector machine and Bouc–Wen is proposed rate-dependent actuators. A rate-independent its parameters identification method established as basis model. Least-squares machine, which optimized particle swarm optimization, introduced improve into adjusting dynamically. Experiment carried out validate both The results show that valid more...

Magnetorheological (MR) absorbers in the artillery recoil systems are usually used to dissipate impact energy as much possible and reduce force transmitted carriage, while firing stability of during buffer process is rarely considered. In this paper, we analyzed characteristics fixed field established corresponding mechanical models. Then, proposed ideal F-v curves these two kinds respectively. The "platform effect" curve was taken control target artillery, based on stability, linear...

In order to identify the nonlinear characteristics of magnetorheological (MR) damper applied in multi-DOF vibration reduction platforms aerospace field modeling process, least square support vector machine (LS-SVM) method is adopted, because LS-SVM can handle small-sample, high-dimensional characteristic problems. Firstly, theory based on was illustrated including genetic algorithm (GA) optimization method. Secondly, curve MR tested different conditions. Then, current and historical input...

The H.264 video coding standard has achieved a significant improvement in efficiency over previous standards. However, the computational complexity of encoder is increased drastically, which results practical difficulties its implementation on embedded platform. This paper presents two techniques to optimize symmetric multiprocessor architecture. We propose coarse-grained functional partitioning method balance load among cores with small overhead synchronization. On other hand, we present...

This study proposes a dual-coil magnetorheological torsional vibration damper (MRTVD) and verifies the effectiveness of semi-active damping control to suppress shaft system’s via experimental research. Firstly, mechanical model designed MRTVD its coupling with rotating system are established. Secondly, response is obtained resonance experiments, influence current on characteristics analyzed. Finally, controlled using skyhook approach. The results demonstrate that when main passes through...

Abstract Background High-quality pork is rich in functional fatty acids such as α-linolenic (ALA), γ-linolenic acid (GLA), docosahexaenoic (DHA), and eicosapentaenoic (EPA), which are thought to prolong lifespan. Multiple studies have confirmed the role of gut microbiota muscle deposition pigs, but inherent complexity remains poorly understood. Results Using a machine learning-based data mining approach, we analyzed dataset containing meat quality, acids, from 291 pigs identify potential...