Random error of grinding process is central factor th at give an effect on grinding quality all through. Optimum methods are usually a pplied on grinding process for higher productivity and preferable grinding quali t...Random error of grinding process is central factor th at give an effect on grinding quality all through. Optimum methods are usually a pplied on grinding process for higher productivity and preferable grinding quali ty. But the grinding quality can’t be reliably controlled now and then while opt imal solution of grinding processing parameters have been applied in production, because of two involved aspects which are availability of established empirical formulas and reliability of setting up optimum mathematical model. That is to s ay, there is particular application of optimum methods in grinding process. This paper discussed that how to confirm conditions of grinding test which be po int to grinding peculiarity when test design and regression analysis are used to setting up some empirical formulas. In order to reduce effect of random errors on precision of the empirical formulas and enable them to be applied widely, a m ethod that a lot of random error can be sufficiently contained in grinding test was suggested. And then, A means to ameliorate restriction formulas of grinding quality is expounded based on marked level of the empirical formulas and improve d reliability of optimum mathematical model is given, which offer an effectual w ay for solving grinding quality out of control as a result of random error and w orkable optimal solution of grinding processing parameters can be applied in the production really. Finally, an example is presented.展开更多
最大功率点跟踪(maximum power point tracking,MPPT)已用于实际变速恒频风电系统中,为更好开展此项技术的研究,对当前的最大功率点跟踪技术进行了总结,并分为以下3类:1)已知给定法;2)黑箱法;3)混合控制法。以带齿轮箱35 kW背靠背变换...最大功率点跟踪(maximum power point tracking,MPPT)已用于实际变速恒频风电系统中,为更好开展此项技术的研究,对当前的最大功率点跟踪技术进行了总结,并分为以下3类:1)已知给定法;2)黑箱法;3)混合控制法。以带齿轮箱35 kW背靠背变换器的鼠笼异步式风力发电并网系统为基础,在Matlab/Simulink仿真环境中,针对已知给定法、黑箱法、混合控制法,各选取了每一类方法的典型代表进行了仿真验证。仿真结果表明,针对这3类方法所适用的功率场合不同,在跟踪最大功率的快速性上存在着差异,需要根据风机特性及从实际运用角度出发来选取不同的方法。展开更多
文摘Random error of grinding process is central factor th at give an effect on grinding quality all through. Optimum methods are usually a pplied on grinding process for higher productivity and preferable grinding quali ty. But the grinding quality can’t be reliably controlled now and then while opt imal solution of grinding processing parameters have been applied in production, because of two involved aspects which are availability of established empirical formulas and reliability of setting up optimum mathematical model. That is to s ay, there is particular application of optimum methods in grinding process. This paper discussed that how to confirm conditions of grinding test which be po int to grinding peculiarity when test design and regression analysis are used to setting up some empirical formulas. In order to reduce effect of random errors on precision of the empirical formulas and enable them to be applied widely, a m ethod that a lot of random error can be sufficiently contained in grinding test was suggested. And then, A means to ameliorate restriction formulas of grinding quality is expounded based on marked level of the empirical formulas and improve d reliability of optimum mathematical model is given, which offer an effectual w ay for solving grinding quality out of control as a result of random error and w orkable optimal solution of grinding processing parameters can be applied in the production really. Finally, an example is presented.
文摘最大功率点跟踪(maximum power point tracking,MPPT)已用于实际变速恒频风电系统中,为更好开展此项技术的研究,对当前的最大功率点跟踪技术进行了总结,并分为以下3类:1)已知给定法;2)黑箱法;3)混合控制法。以带齿轮箱35 kW背靠背变换器的鼠笼异步式风力发电并网系统为基础,在Matlab/Simulink仿真环境中,针对已知给定法、黑箱法、混合控制法,各选取了每一类方法的典型代表进行了仿真验证。仿真结果表明,针对这3类方法所适用的功率场合不同,在跟踪最大功率的快速性上存在着差异,需要根据风机特性及从实际运用角度出发来选取不同的方法。
