工程科学学报
工程科學學報
공정과학학보
Journal of University of Science and Technology Beijing
2015年
9期
1183-1190
,共8页
液压凿岩机%缓冲%性能参数%优化设计%多目标优化
液壓鑿巖機%緩遲%性能參數%優化設計%多目標優化
액압착암궤%완충%성능삼수%우화설계%다목표우화
hydraulic rock drills%damping%performance parameters%optimal design%multi-objective optimization
针对以往分析凿岩机入射应力波为定值的情况,基于应力波在不同介质中传递原理,计算经过多次透射和反射到达缓冲活塞的应力波大小,并运用傅里叶级数推导入射应力波模型.采用应变片实验法测试入射应力波波形,依据实验结果对入射应力波模型进行修正.基于牛顿力学理论,构建双缓冲系统的蓄能器等效刚柔耦合模型和双缓冲机构模型.借助Matlab工具,分析缓冲活塞运动规律以及一、二级缓冲腔压力变化规律.采用多目标优化方法对双缓冲系统的性能参数进行优化,获得双缓冲系统性能参数的最优参量:缓冲流量8.5 L·min-1、环形间隙0.017 mm、蓄能器初始充气压力2.3 MPa以及工作压力7.6 MPa.
針對以往分析鑿巖機入射應力波為定值的情況,基于應力波在不同介質中傳遞原理,計算經過多次透射和反射到達緩遲活塞的應力波大小,併運用傅裏葉級數推導入射應力波模型.採用應變片實驗法測試入射應力波波形,依據實驗結果對入射應力波模型進行脩正.基于牛頓力學理論,構建雙緩遲繫統的蓄能器等效剛柔耦閤模型和雙緩遲機構模型.藉助Matlab工具,分析緩遲活塞運動規律以及一、二級緩遲腔壓力變化規律.採用多目標優化方法對雙緩遲繫統的性能參數進行優化,穫得雙緩遲繫統性能參數的最優參量:緩遲流量8.5 L·min-1、環形間隙0.017 mm、蓄能器初始充氣壓力2.3 MPa以及工作壓力7.6 MPa.
침대이왕분석착암궤입사응력파위정치적정황,기우응력파재불동개질중전체원리,계산경과다차투사화반사도체완충활새적응력파대소,병운용부리협급수추도입사응력파모형.채용응변편실험법측시입사응력파파형,의거실험결과대입사응력파모형진행수정.기우우돈역학이론,구건쌍완충계통적축능기등효강유우합모형화쌍완충궤구모형.차조Matlab공구,분석완충활새운동규률이급일、이급완충강압력변화규률.채용다목표우화방법대쌍완충계통적성능삼수진행우화,획득쌍완충계통성능삼수적최우삼량:완충류량8.5 L·min-1、배형간극0.017 mm、축능기초시충기압력2.3 MPa이급공작압력7.6 MPa.
For the case of constant stress wave input in analyzing a hydraulic rock drill, the value of stress waves which arrived the damping piston was calculated after many transmissions and reflections. Based on the transfer principle of stress waves in different media, a variable input model was deduced by the Fourier transform. The stress wave forms were tested by using a strain gauge and the variable input model was revised according to the test results. An equivalent rigid-flexible model of the accumulator and a structure model of the double damping system were established based on Newton’ s theory. The damping piston movement laws and the pressure change laws of order 1 and order 2 damping chambers were analyzed. The performance parameters of the double damping system were summarized and optimized by a multi-objective optimization method. The optimized results show that the flow of the damping system is 8. 5 L·min-1 , the annular clearance is 0. 017 mm, the inflation pressure of the accumulator is 2. 3 MPa and the working pressure is 7. 6 MPa.