Abstract The co-frequency vibration fault is one of the common faults in operation rotating equipment, and realizing real-time diagnosis great significance for monitoring health state carrying out suppression equipment. In engineering scenarios, are highlighted by rotational frequency difficult to identify, existing intelligent methods require more hardware conditions exclusively time-consuming. Therefore, Lightweight-convolutional neural networks (LW-CNN) algorithm proposed this paper...

Advances in the Google Earth virtual globe and concomitant Keyhole Markup Language (KML) are providing educators with a convenient platform to cultivate assess one's place location knowledge (PLK). This article presents general framework associated implementation methods for online testing of PLK using Earth. The proposed implementations can be easily exported other applications that help geographic knowledge, engaging users content from physical environment human systems at both local...

The quantitative diagnosis of rolling bearing defects still mainly relies on the manual analysis vibration signals, and limited to a specific moment in time, which restricts intelligent identification life-cycle defect evolution. In this paper, novel digital twin-driven Graph Convolutional Memory Network (GCMN) is proposed for evaluating evolution bearings throughout whole life. method, dynamic twin model constructed generate responses that characterize state bearings. capable accurately...

Grinding wheel unbalance will result in vibrations of grinding machines and affect the quality precision workpieces. Therefore, a balancing system is necessary for to lower caused by unbalance. In this study, liquid transfer active system, which was forced compressed air between opposite chambers, applied high-speed spindle. The requirements gas pressure linearity ability were analyzed confirm feasibility proposed device. addition, an experiment also carried out efficiently during operation.

摘要: 质量不平衡是旋转机械最常见的故障之一。为了使转子在运行过程中可以自行消除不平衡振动故障,利用气压液体式自动平衡装置构建靶向自愈调控系统,运行中实时监测诊断转子的振动故障,快速准确地计算转子不平衡量,并进行智能决策,有确定目标地向相应储液腔中注入压缩空气,驱动储液腔中的液体进行定向转移,进而改变和转子同步旋转的平衡盘的质量分布,产生旋转离心自愈力来抵消转子的不平衡故障力,使转子不平衡故障在线自愈。针对旋转机械对平衡盘安装位置的不同要求,介绍轴间和轴端安装两种结构,并分别搭建立式和卧式转子试验台,进行在线自动平衡性能试验。结果表明,两种平衡结构均可在15 s内快速降低转子的振动幅值,降幅均在90%以上。

As an innovative service model for university libraries to break through the traditional model, maker space is favored by majority of teachers and students in universities, it also inevitable product transformation optimized development new era.This study starts with basic concepts makers space, expounds current situation construction Chinese libraries, focuses on analyzing advantages challenges libraries.Finally, provides ideas how build libraries.

Abstract Imbalance vibration is a typical failure mode of rotational machines and has significant negative effects on the efficiency, accuracy, service life equipment. To automatically reduce imbalance during operational process, different types active balancing actuators have been designed widely applied in actual production. However, existing electromagnetic-ring actuator based an axial excitation structure which can cause structural instability low electromagnetic driving efficiency. In...

With the development of high-speed rotating machinery, unbalance vibration feature each rotor system has a greater influence on work efficiency, bearing life, operational time, etc. Therefore, an active balancing is necessary to automatically reduce in process operation. This study introduced novel liquid transfer for hollow rotors, and compensation mass was performed by balance transmission between two pairs contra-positioned chambers. The performance this new actuator analyzed, including...

Active balancing actuators are essential components of intelligent machine tool spindles to automatically reduce the unbalance vibration and promote machining accuracy efficiency. In this study, a novel electromagnetic-ring actuator is introduced, which can be integrated into hollow rotor spindle compensate initial mass imbalance through step rotation two counterweight discs driven by magnetic field. The working principle described in detail its performance analyzed, including ability,...

State-space equations were applied to formulate the queuing and delay of traffic at a single intersection in this paper. The signal control was then modeled as discrete-time optimal problem, with consideration constraints stream conflicts, saturation flow rate, minimum green time, maximum time. problem cannot be solved directly due nonlinear constraints. However, results qualitative analysis used develop first-phase algorithm. Simulation show that algorithm substantially reduces total...

Rotor mass imbalance is the main cause of vibration overload high-end turbine units, which can easily induce a variety failures such as shaft tile and seal wear, blade breakage. The online automatic balancing system solve problem rotor during operation equipment, at same time ensure long-term stable equipment. Therefore, new pneumatic–liquid on-line balance (PLOABS) proposed for has advantages simple structure, no moving parts in rotating element, closed action environment, reversible...

The cantilever dual-rotor system is a typical structure of the blade output end open rotor engine and coaxial turboshaft engine. excessive unbalanced vibration coupled one main factors limiting application above type. In order to accurately describe coupling effect between dual-rotor-intermediate bearings, response analyzed, self-sensitivity coefficient proposed guide selection measuring points suppression experiments for system. On this basis, new online automatic balance actuator...