Applied Mechanics and Materials Vols. 249-250

Abstract: Acoustic temperature measurement technology is a new temperature measuring technology which is rising in recent years. This paper discusses a kind of reconstruction method of temperature field based on acoustic pyrometer. First , acoustic sensors has been used to obtain measurement data, and the technique of wavelet has been used to denoise in order to improve the accuracy of measurement , secondly, the least-squares algorithm has been used to reconstruct temperature field. Finally, we work out our own acoustic temperature measurement system and has got the satisfying result using our own acoustic pyrometer to detect two-dimension temperature field in the laboratory.

Abstract: Two-position north determining scheme for FOG north seeker can effectively eliminate the impact of drift, and can be easily implemented. But the angle between the base and the horizontal plane will induce tilt error and reduce the north seeking accuracy. In order to eliminate the tilt error and to improve the north seeking accuracy, the corresponding tilt compensation scheme is designed in this paper. A tilt sensor is used to measure the angle between the base and the horizontal plane, and the DSP is used to collect the output of the tilt sensor and solve real-time compensation. North seeking experiments proved that this tilt compensation scheme can compensate the base plane tilt error, and improve the north seeking accuracy effectively.

Abstract: Locomotion of many living creatures remains infinitely more advanced and elegant than that of present-day legged walking robots. However, the principles of existing systems are based more on technical rather than on biological concepts, yielding unstable locomotion with low speed. In order to apply those advanced biological phenomena to the design of a Quadruped, the structural and locomotive characteristics of several selected animals are studied. Also, the four-legged walking machine, covering all existing leg arrangements and locomotion patterns, is modeled by a rigid multi-body system, consisting of 13 links and 12 joints. As a time variable, the model is simulated to prove the optimal conditions, which satisfy the principle of minimum energy expenditure.

Abstract: The impeller as the key components of power generating machine, its processing technology has been an important subject in the manufacturing industry. The air flow meter uses in the integral impeller modeling, programming and processing research. Apply UGNX8.0 to the integral impeller for solid modeling and NC machining tool path simulation. In the terms of CNC machining for the characteristic and difficulty, put forward in this paper based on the UGNX8.0simulation of NC machining program and steps, successful interference free tool path, and according to the simulation results, generate four axis NC machining procedure of NC.

Abstract: As heart related diseases are increasing over days, a mandatory need for an accurate, affordable heart rate and blood pressure measurement is essentially required now a day. This paper illustrates the simulation of two devices used to measure the heart rate and the blood pressure. The two proposed designs are built using different type of sensors and the generated results are compared to those of the (HEM-907XL) device from OMRON company. The first proposed design is constructed using either infrared (IR) sensor or light dependent resistance (LDR) to measure the heart rate. On the other hand, the second design is constructed using either a group of strain gauge sensors, or a group of piezoelectric sensors to measure the blood pressure. One hundred human subjects of different ages between 25 and 70 years old are used to test both designs. The two designs are implemented using microcontroller (ATMEGA 16); for it is lower cost and high efficiency. A comprehensive study is conducted on the results using statistical analysis to verify the validity of both designs.

Abstract: In order to solve the weighing problem of a type of incubator shakers, a new weighing method, combined with numerical analysis and experimental verification, is proposed. The numerical analysis based on the software of ANSYS Workbench indicates that the sum of the two-point strain in the mechanism is found to be constant and there is a fine linearity relationship between the sum of the two-point strain and the weight of load, so as to offer a measurement method for indirect measurement of the loading weight and this measuring method has been verified by experiment.

Abstract: The implementation of vibration analysis techniques based on virtual instrumentation has spread increasingly in the academic and industrial branch, since the use of any software for this type of analysis brings good results at low cost. Among the existing software for programming and creation of virtual instruments, the LabVIEW was chosen for this project. This software has good interface with the method of graphical programming. In this project, it was developed a system of rotating machine condition monitoring. This monitoring system is applied in a test stand, simulating large scale applications, such as in hydroelectric, nuclear and oil exploration companies. It was initially used a test stand, where an instrumentation for data acquisition was inserted, composed of accelerometers and inductive proximity sensors. The data collection system was structured on the basis of an NI 6008 A/D converter of National Instruments. An electronic circuit command was developed through the A/D converter for a remote firing of the test stand. The equipment monitoring is performed through the data collected from the sensors. The vibration signals collected by accelerometers are processed in the time domain and frequency. Also, proximity probes were used for the axis orbit evaluation and an inductive sensor for the rotation and trigger measurement.

Abstract: Drum sludge drying equipment is used widely both at home and abroad, and the energy consumption is the key factor of measuring sludge drying equipment. Based on the basis of study of drum sludge drying equipment energy consumption, this paper conducts a comprehensive analysis of drum sludge drying equipment energy consumption factor, and points out that the drum sludge drying equipment energy consumption mainly depends on heat source and drying system configuration, aims to provide reference and research for drum sludge drying equipment.

Abstract: In order to measure to the aiming at amount of changes from baseline, we designed a detector with characteristics of high-resolution. The apparatus takes with the combination of flat glass-based compensation method and reading such sine mechanism on the zero subdivision institutions, to achieve the angle measurement in way of high-resolution and outside reading. By using 0.2″theodolite as the basic instrument for verification of measurement, experimental results show that resolution of the instrument to achieve 2.16″, the measurement error less than 10.8″.

Abstract: Data measured and collected by WSNs is often unreliable and a big amount of anomaly data exist. Detecting these anomaly in energy-constrained situations is an important challenge in managing these types of networks. To detect anomalies induced by the decrease of battery power, we use HyCARCE algorithm but it has the problem of low detection rate and high false positive rate when the input space consists of a mixture of dense and sparse regions which make the anomalies form clusters. The paper presents a density-based algorithm to separate the normal cluster from all clusters. The performance of this algorithm is tested on a subset of the data gathered from a real sensor network deployed at the Intel Berkeley Research Laboratory in the USA and this density-based method has a better detection performance than HyCARCE algorithm.