In an ideal situation, good measuring system can be designed if exact information is known concerning performance and structures involved during the lifetime of the measuring object. But in the real world uncertainties of object exist in this information as well as in the method of measurement. To account for these uncertainties, concept of active measurement has been presented in this paper. Nowadays, scale transform and smart sensor have been applied for realizing elementary active measurement technique, the objective herein is to present measuring method of actively adjusting structure based on these factors. The practicality of this concept is illustrated with an engineering system using wire rope nondestructive testing device, double-point measurement device with eddy current probe as sensors is designed. Mathematical model of the rope’s characteristics and real-time quantity to trim of measure device is established according to relative spacing between sensors and rope. The idea of active control is introduced here, adjusting instrument structure timely based on mathematical relationships and feedback information will achieve the active measurement.

This paper presents a flaw inspection method based on eddy current effect, by comparison of environment analysis and inspection methods for the high-speed train bogie surface flaw. It designed a testing physical prototype and a reasonable control system which was based on eddy current inspection bogie surface flaw, what’s more, it made use of restraining lift-off effect in testing two times, and the result of experiment indicated that method which tested bogie surface flaw was feasible and effective by digital monitor. The method will offer a guarantee for moving of the high-speed train safely and comfortably, and establish a little base to inspect interior flaw and research farther.

Mechatronics system is widely used in computer numerical control, robots, medical equipment, and automatic production etc. Whereas the frequency responses of sensors and actuators in mechatronics system vary greatly, and then sampling time is also different among some links of mechatronics systems. This paper presents the multirate nature of mechatronics systems based on the characteristic of sensors and actuators. Then mechatronics system is described as a multirate discrete control system. Mathematical model of the system is established using lifting technique. Finally, a kind of motion control system that includes multirate controller is analysed and simulated with the different three sampling rates separately. The results show that the presented multirate discrete control system really exists in mechatronics system, and the performance is also influenced in a certain extent under traditional control method.

In order to meet the requirement of magnificent appearance and humanization of the elevator car's decoration, this paper designs a elevator car's display system based on the STC11L60XE. This system is consisted of control module, display module, DS1302 clock module and SJA1000 transceiver module. The control module collects data from the DS1302, uses SJA1000 to receive and analyse data from the elevator motherboard, then drives LCD controller to display information of time and elevator running state. The actual tests in elevator shows that the system has a normal and stable display and can achieve reservation functions.