【摘要】：潤滑油的狀態(tài)檢測是保證機械設備安全穩(wěn)定運行的重要一環(huán),通過準確地在線分析監(jiān)測潤滑油的狀態(tài)可以監(jiān)視機械設備的磨損情況,預測故障的發(fā)生,及時展開維護與維修,可以大大減少維修成本,降低損失,提高生產(chǎn)效率。鐵及其合金材料是構成機械設備零部件的重要成分,當機械零件發(fā)生磨損時,鐵磁性磨粒會出現(xiàn)在潤滑油路中并隨油液流動。所以,檢測油液中的鐵磁性顆粒即可獲得機械設備的磨損程度,達到保障安全穩(wěn)定生產(chǎn)的目的。本課題的目標在于初步研制一臺較為實用的油液中鐵磁金屬顆粒檢測儀,檢測儀采用雙激勵反向電感式傳感器的設計原理。論文研究了油液中金屬顆粒檢測傳感器的影響參數(shù),分析了影響傳感器檢測響應的因素及減小其誤差、提高穩(wěn)定性的方法。通過仿真軟件,建立出該傳感器的有限元二維軸對稱模型,確定能產(chǎn)生較大輸出的傳感器的基本設計參數(shù),作為檢測傳感器實物制作的理論依據(jù)參考。然后根據(jù)仿真模型提供的理論基礎,設計制作出金屬顆粒檢測傳感器,并且設計制作了鐵磁金屬顆粒檢測儀的相關電路,通過實驗驗證傳感器的性能。最后設計出基于單片機的數(shù)據(jù)采集系統(tǒng)用來采集傳感器的輸出,完成油液中金屬顆粒檢測儀的初步研究與設計。經(jīng)初步實驗,該金屬顆粒檢測儀能檢測到100μm以上的鐵磁金屬顆粒。論文的主要創(chuàng)新點:(1)在COMSOL仿真實驗中建立了與傳統(tǒng)“內夾式”基本模型不同的“外套式”新模型,并且對新模型進行了對比研究,得出了優(yōu)于基本模型的仿真實驗結果,取得了傳感器模型研究方面的創(chuàng)新,并依照仿真結果對基本模型和新模型進行了實物實驗驗證。(2)設計了2400~3000Hz頻率可調的交流電源,作為傳感器的專用激勵電源。(3)對傳統(tǒng)單位增益濾波器設計進行了改進,實現(xiàn)了帶有增益的帶通濾波器設計,簡化電路結構的同時取得了較好的濾波與放大效果。(4)針對課題設計了數(shù)據(jù)采集系統(tǒng),將傳感器與單片機數(shù)據(jù)采集系統(tǒng)結合起來,脫離測量儀(如示波器、電感參數(shù)測量儀、光學儀器)的輔助,基本形成一套完整的儀器。
[Abstract]:The condition detection of lubricating oil is an important part of ensuring the safe and stable operation of mechanical equipment. Through accurate on-line analysis and monitoring of the condition of lubricating oil, it can monitor the wear of mechanical equipment, predict the occurrence of failure, and carry out maintenance and repair in time. Can greatly reduce maintenance costs, reduce losses, improve production efficiency. Iron and its alloy materials are important components of mechanical equipment parts. When the mechanical parts are worn, ferromagnetic abrasive particles will appear in the lubricating oil path and flow with the oil. Therefore, the wear degree of mechanical equipment can be obtained by detecting ferromagnetic particles in oil to ensure the safety and stability of production. The aim of this paper is to develop a practical ferromagnetic metal particle detector in oil, which adopts the design principle of double excitation reverse inductance sensor. In this paper, the influence parameters of the metal particle detection sensor in oil are studied, and the factors influencing the sensor's detection response are analyzed, and the methods of reducing the error and improving the stability are analyzed. Through simulation software, the finite element two-dimensional axisymmetric model of the sensor is established, and the basic design parameters of the sensor which can produce large output are determined. Then according to the theoretical basis provided by the simulation model, the metal particle detection sensor is designed and manufactured, and the related circuit of the ferromagnetic metal particle detector is designed and manufactured, and the performance of the sensor is verified by experiments. Finally, a data acquisition system based on single chip microcomputer is designed to collect the output of the sensor, and the preliminary research and design of the metal particle detector in oil are completed. Through the preliminary experiment, the metal particle detector can detect more than 100 渭 m ferromagnetic metal particles. The main innovations of this paper are as follows: (1) in the COMSOL simulation experiment, a new "jacket" model, which is different from the traditional "inner clip" basic model, is established, and the new model is compared and studied, and the results of the simulation experiment which are superior to the basic model are obtained. The research innovation of sensor model is obtained, and the basic model and the new model are verified by the simulation results. (2) the AC power supply with adjustable frequency of 2400~3000Hz is designed. As a special exciting power source for sensor. (3) the design of traditional unit gain filter is improved, and the design of bandpass filter with gain is realized. The circuit structure is simplified and good filtering and amplification effect is achieved. (4) A data acquisition system is designed for the project, which combines the sensor with the single-chip microcomputer data acquisition system, and detaches from the measuring instrument (such as oscilloscope, inductance parameter measuring instrument, etc.) Optical instrument), the basic formation of a complete set of instruments.
【學位授予單位】：濟南大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH70;TP212

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