No abstract

The design of the optical fiber sensor system is used to detect the steel ball surface roughness and defects with displacement change such as cracks, pits, bumps and so on. Experiment results show that the sensor can distinguish between surfaces with different roughness. By establishment of the equivalent evaluation standard for surface quality, the system could detect whether the steel ball surface quality is qualified.

In this paper, the pre-tightening force on piezoelectric multi-dimensional force sensor is researched. Structure of multi-dimensional force sensor and piezoelectric quartz crystals are introduced and analyzed. The relationship between pre-tightening force and measuring range of force sensor is researched. Structural model of multi-dimensional force sensor is built and analyzed by FEM. Horizontal linearity in horizontal direction with different preloads is obtained. In order to verify FEM analysis, a reduced prototype of piezoelectric multi-dimensional force sensor is fabricated. Verification test is designed and made. The research will provide certain reference value for development of piezoelectric multi-dimensional force sensor.

It’s an important problem for power industry; energy industry, aviation and shipping to real-time measure the rotating blades’ tip clearance of engine. The conventional measurement techniques have different limitations. To achieve applied level for tip clearance measurement technique, according to the use request and application environment of tip clearance sensor, a new fiber-optic sensor was put forward to measure the blade tip radial clearance of engine in non-contact mode. The sensor was consist of single-bundle transmitting fiber in the center for laser beam delivery and three groups receiving fibers located in all around for collecting the scattered light. The sensor can not only eliminate the effect to measurement results of light source fluctuation and reflectivity variety of tip surface, but also reduce the effect of angle between the tip surface and sensor end face to measurement results. From the measurement results obtained from sensor on different clearance points, it proves that the sensor measuring system has well feasibility and reliability in blades tip clearance detection.

Analyses the main methods of on-line detection technology in CNC system, and puts forward a method based on eddy current sensor. Because of the grinder’s special structure that different from the lathe’s, fixed the detection device on the Z axis with the cutter, which was proved available. Designed a new sensor structure and using impedance to analyze the signal and process, the experiments show that it has a high precision relatively. Programmed PC software in VB, through G code compiler, the PC can detect and control the system synchronously in the form of motion control card.