Papers by Keyword: Time Interval

Abstract: In this paper, time interval between neighbored layers during the forming process of Surfacing Deposition Forming is defined. Then, surfacing deposition forming are experimented on Cu chilling pedestal and cast iron pedestal individually, the experimental data are processed with Matlab software to research the relationship between time interval and forming layer number, and t method of inspection is exploited to verify the validity of this relationship, even chilling effects on this relationship is studied at the same time. The result shows that: Time interval between neighbored layers would rise more and longer along with the progress of the forming process, and it has a linear relationship with layer number in generally; As the chilling effect, time interval is shortened prodigious, and its relationship with layer number changed to be a cubic curve function.

Abstract: This paper presents a theoretical analysis on energy consumption for industrial robots. In this project, the industrial robot used is a virtual robot resembling the FANUC LR Mate 200iB robotic arm. The first two joints consume the most electrical energy, this research focuses only on the first two joints. The calculation of the electrical energy consumed is based on a previous established research done by Herman (2009) from Universiti Teknikal Malaysia Melaka (UTeM) in the year 2009. In this research, three different time intervals were used to set the speed of the robotic arm to be at 50%, 100% and 200% speed and they were tested on 10 different angles with 10 time intervals for the 1^st and the 2^nd robotic joints.

Abstract: In this paper, we use a compensation method of the measured short interval to improve the measurement accuracy by two groups of multiplex. By using two groups of multi-channel monostable pulse signal as a compensation signal, we respectively compensate time difference between the starting/ending measured short time interval and the reference signal. Pulse width of each compensation signal is uniform increasing and incremental sum is a reference signal cycle. We select the average value of two compensation signals pulse width as the beginning and the end of the time difference when the reference signal value jumps after compensation. Then according to the number of reference signal and two compensation time difference we can obtain measured short time interval. Error analysis and evaluation of uncertainty measurement show that the precision of this method is decided by pulse width increment of adjacent compensation signals. The experimental data shows that the method effectively reduces the measurement error of one reference signal cycle in the measurement of time interval.

Abstract: Power from wind turbines is mainly related to the wind speed. Due to the influence of the uncertainty of the wind, intermittent and wind farm in units of the wake, wind power has fluctuations. Based on the field measurement, it is found that t location-scale distribution is suitable to identify the probability distribution of wind power variations. By analyzing the fluctuation of a single in different time intervals, we find that the distribution of wind power fluctuation possesses a certain trend pattern. With the length of the time window increasing, the fluctuations increase and some information has been missed. We define an index to calculate the quantity of missing information and can use that to evaluate whether a certain length of interval is acceptable.

Abstract: Based on the mesoscopic damage theory and the finite element method, a numerical code RFPA was applied to investigate the rock fragmentation by three TBM cutters loaded one after another in different time interval. The whole process of crack initiation and propagation was successfully simulated by the cutters loaded with different step intervals. The time interval of the disc cutters has significant influence on the fracture patterns and the rock breaking efficiency. The simulated results show that there are three types of breakage mode of the rock subjected to compression by the cutters.

Abstract: Some displacement and deformation for the mine shaft over past many years’ working may occur, which will cause heavy harm to both shaft itself and workers in well. Curtain grouting is one of efficient methods to protect the shaft and the earth’s surface around the shaft from the harm. The deformation caused by grouting around mine shaft is monitored with a reasonable scheme and the monitoring data are processed with the time-series theory to analyze and forecast the dangerous deformation. The paper analysis different time series of different monitoring points, finds the degree of forecast precision and the nicety ratio of forecast model are best.

Abstract: This document explains and demonstrates two simple approximation methods based on the Newton formula. The first method makes possible the transformation of whole temperature-time interval diagrams into temperature-time diagrams to help the comparison of the diagrams. The second shows a way how