Advanced Materials Research Vol. 346

Abstract: A combined measurement method with PIV and schlieren technology is described in this article. The velocity field and the shock wave structure can be obtained simultaneously with this combined measurement method by a synchronous time controller and the post-processing. The color schlieren can capture the instantaneous image effectively and clearly, while the PIV can calculate the time average velocity field and put out with the visual image. Both of them are ripe technologies, they can setup easily and even get some commercial groupwares. In this article, this combined measurement method study the under expanded supersonic jet successfully. Not only limit in the under expanded supersonic jet, this combined measurement method also can apply in the other supersonic flow. They are complementary advantaged to the investigation of supersonic flow.

Abstract: The theory and characteristics of the multi-baseline digital close-range photogrametry were discussed to be used in cultural relics preservation. Take the 3D reconstruction project of the Yu Shan the 5th mural tomb in Ji-an as an example, two methods were put forward to measure the control points of the image without any harm to the object. Also, Tricolor cool tone electron energy conservation lamp was used to meet the strict color control of the mural images. Engineering tests show that the methods put forward could greatly reduce the field work and labor intensity with the characteristics of high accuracy, automation and efficiency. Production efficiency is improved as well. The precision of mapping and image texture satisfies the requirements of cultural relics preservation. In addition, how to manage and index such data through database technology needs further study.

Abstract: Irreducible water saturation is one of the fundamental parameters in characterizing reservoir formations, and determined as the key factor in reserve calculation and fluid type identification. Measurement on whole core must be taken to analyze irreducible water saturation of volcanic rocks as a result of lithological diversity, porous structure complexity and strong heterogeneity. A new testing method for whole core is proposed by combining Nuclear Magnetic Resonance and centrifugal tests. This new method measures irreducible water saturation using T2 spectrum of whole core demarcated by T2 cutoff measured on 25mm or 38mm diameter core samples which drilled from the whole core. The new method solved the size and shape restricts, long test cycles and viscous fingering defects of conventional methods. According to the comparison with conventional method, the results of the new method coincide well on homogeneous rocks, and are more accuracy with fractured samples.

Abstract: For vehicular hydraulic braking system using linear solenoid valves, an experiment setup is built for test, and the nonlinear dynamic model is developed using a combination of mechanistic and empirical methods. Unknown parameters are identified using least squares. The model can be used for simulation and pressure estimation effectively. In order to use this model in controller design, a simplification is also performed and a polynomial static model is obtained between the pressure rate and the driving signal. Model validations are performed by comparing the simulated and measured curves.

Abstract: An inexpensive and simple approach using ultraviolet-spectroscopy to distinguish vinegar samples was developed. Vinegar samples were diluted with distilled water(water/vinegar was 6/1, v/v), then distilled with rotary evaporator at 45°C. The distilled liquid was introduced into the UV-Vis 2550 spectrophotometer to scan the UV spectrum from 245 nm to 330 nm, distilled water was used as reference solution. Once spectra were collected, principal components analysis (PCA) and artificial neural network (ANN) were employed for the exploratory analysis and the development of classification models, respectively. The criteria for discrimination were various raw materials and the different fermentation process of vinegars. The correct rate of the classification according to the production process was more than 90% and it was 100% according to the raw materials. The ANN model also could be used to class vinegar samples according to the raw materials, the correct rate was 80.95% in this research.

Abstract: In order to obtain the trolley-load system’s dynamic equations for overhead crane or gantry crane, analyzed the dynamic system and deduced the transfer function between the load’s sway angle and the force acting on the trolley from dynamic equations. The force control mode for load’s damping swing is an effective measure of compensation for active anti-swing. Dynamic simulation results show that the optimal evacuation time of the force acting on the trolley is a key parameter that affects the damping swing’s effect. The load’s damping swing effect is favorable when the driving force is withdrawn at optimal withdrawing time; the load’s swing angle’s amplitude will increase with driving force’s increase, but the damping swing effect is still favorable if the optimal withdrawing time is favorably controlled.

Abstract: In this paper, Ultrasound Wireless System is introduced for wireless communication between the sides of ultra-thickness plank without breach of the structure. This system could be applied in the plank of the difference material of metal or non-metal and in environment in which high seal condition is required in uttermost, for instance ultra-pressure, radiation and virulent test. In this wireless system, the ultrasonic telemetry using single pulse for driving and receiving PZT has been designed and built to demonstrate the ability of the ultrasonic telemetry. This paper describes the designed transmitting circuit and receiving circuit and the results of a pilot set up. The driving characteristics and frequency response of PZT was analyzed and tested. It is very important that the transmitting circuit and receiving circuit were designed according to the frequency characteristics of the PZT and coupling, that is, the width of pulse and frequency of signal for the driving PZT must be properly chosen. It has been shown that communication of sensor signals can be made at two sides of steel enclosed container using PZT as ultrasonic transmitters and receivers.

Abstract: In this paper, new type electro-hydraulic servo equipment is given for testing the working feature on pumping unit. It is the key to get the real simulation of motion and loading of pumping unit. The equipment in paper can be used to repeat all kind of the real force and motion on pumping unit. In order to get better simulation results, the algorithm for self-adaptation control with Kalman filter, which is used for error-free estimate of motion state in order to obtain high accuracy, is applied to solve powerful motion error—surplus force in passive loading system . All algorithms can be used in computer. Last, the test results of pumping unit loading are given. By actual use，the results show that self-adaptation control model with Kalman filter are used for decreasing error by motion of loading system is feasible and the control model can automatically regulate coefficients of regulator.