根据摇摆式凸轮轴磨削运动几何原理·提出了一种多约束凸轮轴凸轮型线数控磨削插补技术·建立了以凸轮矢角·为参变量的插补算法模型·给出了插补过程与实时伺服相分离的前后台式控制策略思想·并验证了插补算法的精度和效率·为研制摇摆式凸轮轴数控磨床提供了理论参考·

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.

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 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.

超磁致伸缩材料是一种新型的功能材料，其微位移执行器的设计理论和方法具有特殊性。分析了超磁致伸缩材料的工作特性，给出了超磁致伸缩微位移执行器的原型。在此基础上，建立了执行器的微位移传递机构、磁路、驱动线圈及其冷却等几个关键部分的数学模型，并提出其设计理论和方法。同时，采用上述理论和方法研制了超磁致伸缩微位移执行器样机，通过试验验证了其正确性和实用性。