Applied Mechanics and Materials Vol. 575

Abstract: This paper offers motivation for modeling and simulation of an electromagnetic levitation based active suspension system (EMLASS) using bondgraph. Model of EMLASS contains 2 electromagnets as an unsprung mass and one magnet as sprung mass. Levitation based suspension is a novel technique to develop an active suspension over current technology. It has a high dynamic capability which is more sensitive for the road irregularities and its advantage is to provide additional stability to eliminate the effect of road irregularities. Our goal is to develop mathematical modeling and bondgraph modeling of EMLASS.

Abstract: This paper illustrates how Space-time Conservation Element and Solution Element (CE/SE) method which is developed for compressible flow can be used to solve the Saint-Venant equations numerically. The sharp shock-capturing capability of the scheme is demonstrated through the simulation of hydraulic jump phenomenon in prismatic open-channels. Two channel cross-section geometries are considered, viz rectangular and triangular cross sections. The code developed for the present study is validated by solving the benchmark problem of dam-break flow. The numerical solution of the Saint-Venant equations for the rectangular channel is found to be in good agreement with the experimental data available in the literature. The effect of channel wall slope on hydraulic jump in triangular channel is also discussed in this paper.

Abstract: With the appliances increasing on campus, illegal appliances caused a great security risk to the campus grid security. For malignant load of illegal appliances, we design intelligent detection system of load to solve the problem. First, this paper analyzes the forecasting method for campus electricity load, and does statistical analysis of the amount of college electricity load for 24 hours; followed by the overall design of intelligent detection system of malignant load, describing its features and performance indicators; finally, the system’s part implementation and source code. This

Abstract: In this paper, remote monitoring technology and its application to control of industrial power supply are discussed in detail, including its composition, function and classification. The two approaches of wired and wireless communication are analyzed, and four cases of typical systems are introduced as well. Practice has proved that the presented several control schemes are feasible and effective.

Abstract: This paper proposes a new fault detection scheme using a bank of finite memory filters for discrete-time dynamic systems with multiple sensors. In the proposed scheme, fault detection is carried out by testing the consistency of two filtered estimates, which are obtained from the primary estimation filter and the auxiliary estimation filter using a bank of finite memory filters, respectively. Detection latency is considered as one of important performance criteria and focus on the improvement of detection latency even for high threshold value. Through extensive computer simulations for the F-404 engine system, it is shown that detection latency can be adjusted by the window length. Simulation results show that the trade-off between the fast detection performance and the noise-suppressing estimation performance should be needed for the proposed fault detection scheme in real applications.

Abstract: MapReduce is a highly efficient distributed and parallel computing framework, allowing users to readily manage large clusters in parallel computing. For Big data search problem in the distributed computing environment based on MapReduce architecture, in this paper we propose an Ant colony parallel search algorithm (ACPSMR) for Big data. It take advantage of the group intelligence of ant colony algorithm for global parallel search heuristic scheduling capabilities to solve problem of multi-task parallel batch scheduling with low efficiency in the MapReduce. And we extended HDFS design in MapReduce architecture, which make it to achieve effective integration with MapReduce. Then the algorithm can make the best of the scalability, high parallelism of MapReduce. The simulation experiment result shows that, the new algorithm can take advantages of cloud computing to get good efficiency when mining Big data.

Abstract: In remote sensing imaging, bidirectional reflectance distribution function (BRDF) is powerful tool to describe light reflectance characteristic. Based on BRDF distribution of ground object, reflectance distribution in all directions will be calculated, and radiation difference of remote sensing imaging can be calibrated. This paper analyzes the several empirical / semi-empirical BRDF model suitable for the rough earth surface. The cement ground was selected as typical experiment topography, and the ground reflectance in all directions at different solar zenith angle was obtained. We compare measurement data to calculation results of three theoretical models, including five parameter model, Staylor & Suttles model and Walthall model, and analyze and evaluate effectiveness of various models.

Abstract: This paper presents a novel method to diagnose turbine blade faults by analysing wavelet result based on fingerprint recognition method. The study focuses on applying the fingerprint features extraction method to extract faults information from wavelet displays. Fingerprint recognition method studied in this paper is known as fingerprint bifurcations points. Experimental results show that this method could potentially be used as a features recognition method to identify the different types of machinery faults such as rubbing and rotor unbalance.

Abstract: Machinery faults can be detected by various signal processing tools; however, they require human expertise to achieve maximum success. Machine learning tools can help to achieve automatic machinery-faults diagnosis. This paper provides a brief review of the most common machine learning tools.

Abstract: This article selects an intelligent pulse three-stage charger commonly used in electric bicycles and conducts fault simulation tests of the charger under different environmental conditions based on analysis of the charging characteristics of a lead-acid battery. The test proves that the fault of the charger may lead to breakdown or explosion of the electronic devices of the charger; however, the possibility of a fire inside the charger is very small because of limited temperature rise of heating components in the charger, a small amount of combustible materials in the components, flame retardant plastics-made charger housing, etc. A fire inside the charger easily results in short circuit of connecting lines. If there is no a protective device, the electric bicycle easily catches fire.