In order to make up for the driving shortage of fast tool servo （FTS） system,an electromagnetic driven DDS system was developed to realize the tracking control method of high bandwidth trajectory.The feedforward compensation of parameters is realized by using static gain,and the disturbance observer（DOB） is established by linear control to compensate the feedforward gain processing.The experimental test and analysis were carried out to collect control instructions from the controller to realize the driving effect on FTS excitation coils and complete the output displacement control.The results show that the resonant peak can be suppressed obviously when using PAVPF controller.The damping control keeps the stability margin constant,and then the higher gain PID controller controls the system to achieve a significant increase in the closed-loop bandwidth of the system.PAVPF damping reaches±2μm error;After increasing the DOB gain,the maximum error reduction of the system is close to±0.16μm.The research has a good control precision,which plays a theoretical supporting role for high precision tool control.

为了提高激光熔覆TC4合金切削加工性能,通过设计高速铣削测试方案比较了TC4合金在铸造与激光熔覆条件下的切削性能差异.研究结果表明:激光熔覆钛合金在采用铣削加工过时表现出各向异性,铣削方向与熔覆轨迹一致,主切削力高于90°方向.在采用铣削方式处理钛合金时,主切削力随着单齿进给量不断增大而持续增大,主切削力随着切削刃不断增大而升高.主切削力在铣削深度增大的条件下呈线性上升,导致切削刃的切削抗力升高.铣削速度在100～400 m/min范围内,削主切削力在铣削速度逐渐增大的情况下呈现上升趋势.

为了进一步提高车辆运行稳定性和节能效果,设计了一种可控阻尼车辆半桥式液压馈能减振器.以半桥式液压馈能减振器为对象,创建相应动力学模型,并开展仿真分析.研究结果表明:在外接电阻变小或者激励频率增加时,均会引起馈能功率增大;采取行程复原形式来回收能量不会引起能量回收状态改变.调整激励频率可获得大致相同馈能效率,其调整幅值大约为4％;在外负载从10Ω增加到100Ω后,馈能效率由40％降低至8％;在电阻率升高会产生更加缓和降低趋势.在50Ω外负载环境下,压缩阻尼力为-2838N、复原阻尼力为-6891N,均为最大值,符合目标阻尼的需求.此结构优点在于无需频繁进行启停切或者运动换向操作,确保液压油路产生优异整流功效.

随着改革开放的深入和对环保的重视以及合理利用资源,燃油锅炉代替了燃煤锅炉并得以开发和广泛的使用,对燃油锅炉必将有严格要求。