Abstract Wire rope is an element often used in transportation infrastructure and systems such as bridges, elevators, ropeways, funiculars so on. Generally, wire ropes require a high level of safety because they suspend heavy important components roadways cages cabins ropeways funiculars. In addition to dead loads like roadways, are subjected dynamic caused by earthquakes, wind moving cars, etc....

This paper presents an investigation into development of feed-forward and feedback control strategies for active vibration suppression and attitude control of flexible spacecrafts. The feed-forward loop consists of a computed-torque scheme and a command shaping technique based on component synthesis vibration suppression (CSVS) method which was developed based on linear systems theory. For rela...

In view of the high rate of false alarm problems on the distributed optical fiber sensing technique applied in enclosure, a sensor is proposed based on double MachZehnder interferometer and a method is needed urgently to identify intrusion accurately. This involves eliminating nonintrusion events caused by operating environments from intrusion events. To address the issue, this paper states the...

This paper proposes an expert system called VIBEX (VIBration EXpert) to aid plant operators in diagnosing the cause of abnormal vibration for rotating machinery. In order to automatize the diagnosis, a decision table based on the cause-symptom matrix is used as a probabilistic method for diagnosing abnormal vibration. Also a decision tree is used as the acquisition of structured knowledge in th...

Structural vibration testing is a measurement technique that is used in engineering to examine the condition of structures, such as bridges and airplanes. The basic idea behind structural vibration testing is that damage will alter the stiffness, mass or energy dissipation properties of a system, which in turn will change the dynamic response of the system when it is excited with a forcing func...

Vibration analysis does not cover all defects able to affect a rotating machine, including those that induce torque or instantaneous rotation speed fluctuations. Indeed the vibrational energy contributions of this type of defects such as a natural and gradual degradation of the gears are often weak. Therefore the appearance of these defects is very difficult to detect from the vibrational energ...

The diagnosis of gearbox faults based on the Fourier analysis of the vibration signal produced from a gear reductor system has proved its limitations in terms of spectral resolution. In this paper, we propose a method for the fault diagnosis of a gear reductor made of two toothed wheels operating at constant conditions. This technique is based on Prony method. The good performances of the propo...

Continuously monitoring the operation of each individual fan can significantly improve the measurement quality of aerial pollutant emissions from animal buildings that have a large number of fans. To monitor the fan operation by detecting the fan vibration is a relatively new technique. A low-cost electronic vibration sensor was developed and commercialized. However, its large scale application...