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首页> 外文会议>International Conference on Vibration Measurements by Laser and Noncontact Techniques >On the Development of a Magnetoresistive Sensor for Blade Tip Timing and Blade Tip Clearance Measurement Systems
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On the Development of a Magnetoresistive Sensor for Blade Tip Timing and Blade Tip Clearance Measurement Systems

机译：关于叶片尖端定时和叶片尖端间隙测量系统磁阻传感器的开发

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The accurate control of the gap between static and rotating components is vital to preserve the mechanical integrity and ensure a correct functioning of any rotating machinery. Moreover, tip leakage above the airfoil tip results in relevant aerodynamic losses. One way to measure and to monitor blade tip gaps is by the so-called Blade Tip Clearance (BTC) technique. Another fundamental phenomenon to control in the turbomachines is the vibration of the blades. For more than half a century, this has been performed by installing strain gauges on the blades and using telemetry to transmit the signals. The Blade Tip Timing (BTT) technique, (i.e. measuring the blade time of arrival from the casing at different angular locations with proximity sensors) is currently being adopted by all manufacturers as a replacement for the classical strain gauge technique because of its non-intrusive character. This paper presents a novel magnetoresistive sensor for blade tip timing and blade tip clearance systems, which offers high temporal and high spatial resolution simultaneously. The sensing element adopted is a Wheatstone bridge of Permalloy elements. The principle of the sensor is based on the variation of magnetic field at the passage of ferromagnetic objects. Two different configurations have been realized, a digital and an analogue sensor. Measurements of tip clearance have been performed in an high speed compressor and the calibration curve is reported. Measurements of blade vibration have been carried out in a dedicated calibration bench; results are presented and discussed. The magnetoresistive sensor is characterized by high repeatability, low manufacturing costs and measurement accuracy in line with the main probes used in turbomachinery testing. The novel sensor has great potential and is capable of fulfilling the requirements for a simultaneous BTC and BTT measurement system.
机译：静电和旋转部件之间的间隙的精确控制对于保持机械完整性至关重要，并确保任何旋转机械的正确功能。此外，翼型尖端上方的尖端泄漏导致相关的空气动力学损失。测量和监视叶片尖端间隙的一种方法是通过所谓的刀片尖端间隙（BTC）技术。在涡轮机中控制的另一个基本现象是刀片的振动。半个以上，通过在刀片上安装应变仪并使用遥测来传输信号来执行这一点。所有制造商目前采用刀片尖端定时（即，测量从带有接近传感器的不同角度的壳体到达的壳体的叶片时间）是由于其非侵入性的典型应变仪技术的替代品特点。本文介绍了一种用于叶片尖端定时和叶片尖端间隙系统的新型磁阻传感器，其同时提供高时和高空间分辨率。采用的传感元件是百可原物元素的惠斯通桥。传感器的原理基于铁磁物体通过磁场的变化。已经实现了两种不同的配置，数字和模拟传感器。已经在高速压缩机中进行了尖端间隙的测量，并报告了校准曲线。叶片振动的测量已经在专用校准台中进行;提出和讨论了结果。磁阻传感器的特点是重复性高，制造成本低，以及涡轮机械测试中使用的主要探头的测量精度。新型传感器具有很大的潜力，能够满足同时BTC和BTT测量系统的要求。

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