针对恒转速凸轮轴磨削存在的问题，提出一种实现凸轮轴变转速磨削的分析方法，建立了以凸轮矢角H为参变量的数学模型，并验证了这种分析方法的可行性，为研制变转速凸轮轴数控磨床提供了理论依据。

采用新型的功能材料——超磁致伸缩材料作为微位移器件，研制了一种具有位移感知功能的超磁致伸缩微位移执行器，并建立了其微位移闭环控制系统。提出了一种高分辨率、无摩擦、传感位移传递一体化的圆形膜片式柔性结构，作为超磁致伸缩微位移执行器的微位移传递和感知机构。应用薄板弯曲理论得出了相应的挠度、应变变化率的解析表达式及分布曲线，确定了微位移感知传感器的分布形式，实现了执行器的微位移感知功能。同时，对研制的具有位移感知功能的超磁致伸缩微位移执行器及其微位移闭环控制系统进行实验研究，结果表明：执行器的微位移感知灵敏度和系统的微位移闭环控制精度较高。

The electric thickness of the semi-finished radome may not meet the requirement for the electromagnetic performance because it varies with both the geometry thickness and the electric inductivity of the radome. One way to obtain the required value of the electric thickness is to compensate the electric thickness error by modifying the wall thickness of the radome. To this end, a grinding machine is developed and applied to precisely grind the inner surface of the radome. In order to ensure the grinding precision, it is important to keep the grinding machine under a stable, rapid and precise control. In this paper, a compound control strategy, which is a combination of the cascade control of 3-loop, the feedforward control and the PID algorithm, is proposed to realize a highly precise and reliable control over the grinding machine. Moreover, the architecture of the control system, the algorithm of the main controller based on DSP technology and the method of adjusting parameters are also introduced. It is shown that this compound control strategy has the advantages of high control accuracy and strong anti-jamming ability, being effective and applicable.

According to the principle of the magnetostriction generating mechanism, the control model of giant magnetostriction material based on magnetic field and the control method with magnetic flux density are developed. Furthermore, this control method is used to develop a giant magnetostrictive micro-displacement actuator (GMA) and its driving system. Two control methods whose control vari-ables are current intensity and magnetic flux density are compared with each other by experimental studies. Finally, effective methods on improving the linearity and control precision of mi-cro-displacement actuator and reducing the hysteresis based On the controlling magnetic flux density are obtained.

The radome is to ensure the antenna work normally in extreme harsh condition. It not only meets the shape aerodynamics requirement to withstand the thermal and mechanical loads during a high-speed flight, but also satisfies the electromagnetic property requirement. Electric thickness is an important electromagnetic performance index embodying the comprehensive influence of the geometric thickness, the material dielectric constant, and the incidence angle, on the electromagnetic wave transmission characteristics. After semi-finished machining, the electric thickness of the radome that is made of hard and brittle material often fails to meet the requirement owing to geometric error and non-uniformity of the dielectric constant. This electric thickness error has to be compensated through altering geometric thickness by precision grinding of the inner surface. Theoretically, the radome is a solid of revolution with a 3-D complex and curved surface. Therefore, the inner surface precision grinding is, in fact, a machining process for free form surfaces. In this paper, a digitized machining scheme and technical guideline is proposed. Firstly, the inner surface of the radome is precisely measured to set up a grinding datum. Secondly, the finishing grinding is performed based on the real inner surface and the required machining allowance. In addition, to avoid installation errors, the measuring and grinding processes are accomplished on the same machine tool for one-loading and two-operations. It is shown in practice that this technical guideline satisfies all of the performance index requirements for finish machining of the radome, effectively solving the difficult problem existed in finish machining of semi-finished radomes.