基于多準則的裝載機半軸載荷樣本長度的確定方法
發(fā)布時間：2018-08-26 17:45
【摘要】：輪式工程車輛作業(yè)工況復(fù)雜多變，全壽命載荷測試需要選擇不同的地區(qū)進行，從而對車輛總體性能進行估計。全壽命載荷測試的實驗周期長，而且耗費大量的人力、物力，通過研究裝載機測試的樣本載荷，建立典型工況的載荷譜，是實現(xiàn)分析與改進現(xiàn)服役裝備、提高零部件可靠性的重要依據(jù)。載荷譜是對零部件的疲勞損傷預(yù)測的基礎(chǔ)。 本文結(jié)合國家自然科學基金資助項目（編號50805065）：“輪式工程車輛傳動系載荷譜關(guān)鍵技術(shù)研究”開展，分析了小載荷濾除標準，建立了基于多準則的多工況最優(yōu)樣本長度確定的方法，編制了半軸的全壽命載荷譜且預(yù)測了疲勞壽命。 本文的具體內(nèi)容和主要結(jié)論如下： （1）獲取估計樣本量的有效載荷。從載荷循環(huán)和載荷極值點分析了裝載機半軸載荷特性，，基于疲勞損傷和POT理論提出了有效載荷的選取準則，剔除了實際載荷包含大量不產(chǎn)生疲勞的小循環(huán)載荷情況。 （2）建立了基于載荷多個特性的最優(yōu)樣本長度確定方法。對經(jīng)典工程車輛載荷樣本長度確定方法的總結(jié)分析，對比各個方法的優(yōu)缺點，基于多準則決策技術(shù)，確定出以載荷循環(huán)、載荷極值均值和載荷極值標準差為準則的最優(yōu)樣本長度確定方法，分析并估計了大石方、小石方和原生土三種工況下載荷的樣本長度。 （3）多工況下半軸全壽命載荷譜的編制。通過對雨流計數(shù)統(tǒng)計的載荷幅值與載荷均值聯(lián)合概率密度函數(shù)進行估計，獲得載荷的分布形式，由參數(shù)外推編制了半軸在大石方、小石方和原生土工況下的全壽命載荷譜。并依據(jù)已估計的最優(yōu)樣本長度編制了不同樣本長度外推的半軸全壽命載荷譜，驗證了最優(yōu)樣本長度的有效性。 （4）半軸疲勞壽命預(yù)測。依據(jù)Miner線性疲勞累積假說，由ANSYS對半軸進行有限元分析，再結(jié)合Nsoft和已編制的載荷譜對半軸進行了疲勞壽命預(yù)測。 本文提出的基于多準則最優(yōu)樣本長度的確定方法考慮了載荷的多個特性，所確定的樣本值更具有合理性，對工程機械領(lǐng)域樣本載荷測試和載荷譜的準確編制具有實際應(yīng)用價值。
[Abstract]:Since the operating conditions of wheeled engineering vehicles are complex and changeable, the whole life load testing needs to be carried out in different areas, so as to estimate the overall performance of the vehicles. The whole life load test has a long experimental period and consumes a lot of manpower and material resources. By studying the load of the load sample tested by the loader, the load spectrum of typical working condition is established, which is to realize the analysis and improvement of the equipment in service. The important basis for improving the reliability of parts. Load spectrum is the basis of fatigue damage prediction of parts. Based on the project (No. 50805065) funded by the National Natural Science Foundation of China (No. 50805065): "Research on key Technologies of load Spectrum of wheeled Engineering vehicle Transmission system", the paper analyzes the standard of small load filtering. The method of determining the optimal sample length of multi-working conditions based on multi-criteria is established, and the full-life load spectrum of the half-shaft is compiled and the fatigue life is predicted. The main conclusions are as follows: (1) the payload of estimating sample size is obtained. Based on the analysis of load cycle and load extremum, the load characteristics of loader semi-shaft are analyzed. Based on the theory of fatigue damage and POT, the selection criteria of payload are proposed. The actual load contains a large number of small cyclic loads without fatigue. (2) an optimal sample length determination method based on multiple load characteristics is established. This paper summarizes and analyzes the method of determining the load sample length of the classical engineering vehicle, compares the advantages and disadvantages of each method, and determines the load cycle based on the multi-criteria decision technology. The method of determining the optimal sample length based on the criterion of the mean value of load extremum and the standard deviation of load extremum is analyzed and estimated. Sample length of load under three conditions: small stone and primary soil. (3) compilation of full life load spectrum of half shaft under multiple working conditions. By estimating the joint probability density function between the load amplitude and the mean value of the load, the distribution form of the load is obtained, and the whole life load spectrum of the half-axis under the working conditions of the big stone square, the small stone side and the primary soil is derived from the parameter extrapolation. According to the estimated optimal sample length, the full life load spectrum of different sample length extrapolation is compiled, which verifies the validity of the optimal sample length. (4) the prediction of semi-axial fatigue life. According to the Miner's linear fatigue accumulation hypothesis, the semi-axial fatigue life is predicted by using ANSYS finite element analysis and combined with Nsoft and the load spectrum. The method proposed in this paper for determining the optimal sample length based on multi-criteria takes into account several characteristics of load, and the determined sample value is more reasonable. It has practical application value for sample load test and accurate compilation of load spectrum in the field of construction machinery.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH243
本文編號：2205677
[Abstract]:Since the operating conditions of wheeled engineering vehicles are complex and changeable, the whole life load testing needs to be carried out in different areas, so as to estimate the overall performance of the vehicles. The whole life load test has a long experimental period and consumes a lot of manpower and material resources. By studying the load of the load sample tested by the loader, the load spectrum of typical working condition is established, which is to realize the analysis and improvement of the equipment in service. The important basis for improving the reliability of parts. Load spectrum is the basis of fatigue damage prediction of parts. Based on the project (No. 50805065) funded by the National Natural Science Foundation of China (No. 50805065): "Research on key Technologies of load Spectrum of wheeled Engineering vehicle Transmission system", the paper analyzes the standard of small load filtering. The method of determining the optimal sample length of multi-working conditions based on multi-criteria is established, and the full-life load spectrum of the half-shaft is compiled and the fatigue life is predicted. The main conclusions are as follows: (1) the payload of estimating sample size is obtained. Based on the analysis of load cycle and load extremum, the load characteristics of loader semi-shaft are analyzed. Based on the theory of fatigue damage and POT, the selection criteria of payload are proposed. The actual load contains a large number of small cyclic loads without fatigue. (2) an optimal sample length determination method based on multiple load characteristics is established. This paper summarizes and analyzes the method of determining the load sample length of the classical engineering vehicle, compares the advantages and disadvantages of each method, and determines the load cycle based on the multi-criteria decision technology. The method of determining the optimal sample length based on the criterion of the mean value of load extremum and the standard deviation of load extremum is analyzed and estimated. Sample length of load under three conditions: small stone and primary soil. (3) compilation of full life load spectrum of half shaft under multiple working conditions. By estimating the joint probability density function between the load amplitude and the mean value of the load, the distribution form of the load is obtained, and the whole life load spectrum of the half-axis under the working conditions of the big stone square, the small stone side and the primary soil is derived from the parameter extrapolation. According to the estimated optimal sample length, the full life load spectrum of different sample length extrapolation is compiled, which verifies the validity of the optimal sample length. (4) the prediction of semi-axial fatigue life. According to the Miner's linear fatigue accumulation hypothesis, the semi-axial fatigue life is predicted by using ANSYS finite element analysis and combined with Nsoft and the load spectrum. The method proposed in this paper for determining the optimal sample length based on multi-criteria takes into account several characteristics of load, and the determined sample value is more reasonable. It has practical application value for sample load test and accurate compilation of load spectrum in the field of construction machinery.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH243
【參考文獻】
相關(guān)期刊論文 前10條
1 張云龍,諸文農(nóng),許純新;裝載機傳動系載荷樣本長度的確定[J];工程機械;1994年06期
2 殷涌光,程悅蓀,陳秉聰,金弼,李俊明;裝載機機體振動和半軸扭振的關(guān)系[J];工程機械;1987年10期
3 李維擁;半軸傳動軸斷裂分析[J];機械工程材料;1981年01期
4 閻楚良,高鎮(zhèn)同;最少空測采樣飛行起落次數(shù)設(shè)計準則[J];航空學報;1999年06期
5 彭志奇;于亞倫;;模糊多準則決策法在房地產(chǎn)投資機會決策中的應(yīng)用[J];基建管理優(yōu)化;2000年03期
6 李葉妮;林少芬;劉少輝;江小霞;;回歸分析法在樣本長度誤差分析中的應(yīng)用[J];集美大學學報(自然科學版);2010年01期
7 李天亮;鄒仕軍;孫冬;何秀然;;飛機疲勞載荷譜分析的一種新方法[J];機械科學與技術(shù);2006年06期
8 凌靜;高鎮(zhèn)同;;疲勞載荷數(shù)據(jù)的計算機統(tǒng)計處理[J];機械強度;1991年01期
9 陳東升,項昌樂,陳欣;軍用車輛傳動系零件載荷譜的建立[J];機械強度;2002年02期
10 石來德;佟德純;;信號處理技術(shù)在載荷譜研究中的應(yīng)用[J];建筑機械化;1983年03期
本文編號：2205677
本文鏈接：http://sikaile.net/kejilunwen/jixiegongcheng/2205677.html
最近更新
教材專著
