CAJ | 학술논문

为了实现轨面不平顺的在线连续检测，并进一步提高弦测法的检测精度，提出了一种四点弦测法。通过理论推导其传递函数，并基于快速傅里叶（FFT）变换利用MATLAB建立了其自动复原算法。为更加合理地确定四点弦测法各参数，用20个随机产生的正弦波叠加模拟轨面不平顺并选用复原误差的最大值、平均值和标准差3个指标来进行复原精度比选。在最优参数的基础上，对上海地铁一段长30 m的实测数据进行复原，其结果与对应形式下三点弦测法的复原结果对比，结果表明四点弦测法的复原精度能控制在微米级，且相对于三点弦测法误差平均值和标准差均改善了50%以上，最大值改善了70%以上。
위료실현궤면불평순적재선련속검측，병진일보제고현측법적검측정도，제출료일충사점현측법。통과이론추도기전체함수，병기우쾌속부리협（FFT）변환이용MATLAB건립료기자동복원산법。위경가합리지학정사점현측법각삼수，용20개수궤산생적정현파첩가모의궤면불평순병선용복원오차적최대치、평균치화표준차3개지표래진행복원정도비선。재최우삼수적기출상，대상해지철일단장30 m적실측수거진행복원，기결과여대응형식하삼점현측법적복원결과대비，결과표명사점현측법적복원정도능공제재미미급，차상대우삼점현측법오차평균치화표준차균개선료50%이상，최대치개선료70%이상。
In order to realize continuous detection of rail surface irregularities and improve detection precision, a new four-point approach based on chord reference method is presented in this paper. With the theoretical de-duction of its transfer function,the automatic restoration algorithm based on Fast Fourier Transform(FFT)has been realized by means of MATLAB. A simulation waveform consisting of 20 random sine waves has been used for scientific determination of the three separation distances. The maximum value,average value and stan-dard deviation of restoration error are therefore adopted to weigh their restoration precision. Finally,on the ba-sis of optimal parameters,a length of 30m real track irregularities from Shanghai metro is used for comparison. Results show that restoration precision of the new four-point method has been controlled at micron level. In the aspect of restoration error’s average value and standard deviation,the detection precision has been improved over 50%and the maximum value has been improved over 70%when compared to the traditional three-point method.