Applied Mechanics and Materials Vols. 220-223

Abstract: The flow throttling device for the V-shaped cone-type cutting device, the throttling device to break the traditional flow through the throttling device will shrink to the concept of the pipeline near the central axis, the use of coaxial pipe installed in the V-shaped tip cone contraction of the fluid gradually cutting edge to the inner pipe wall, by measuring the V-shaped inner cone to measure the differential pressure before and after the flow of design ideas. This V-cone flowmeter in a shorter straight pipe conditions, to a wider range than on the clean or dirty fluids to achieve a more accurate and more effective flow measurement. This will be based on single-chip cone flowmeter air mixing systems used in ship gas flow measurements, experimental results show that the SCM-based cone flowmeter has a small size, light weight, high accuracy, easy to use security features .

Abstract: Manifestation of friction between the drill string and the borehole is of special importance for modern drilling. A novel lubricity tester, in combination with high pressure high temperature(HPHT) actuators, has been designed to permit the evaluation and testing of various types and the lubricity of drilling fluids by simulating the rotational speed of the drill pipe and pressure exerted against the borehole. This instrument mainly consists of four parts, i.e., a friction mechanism, HPHT actuators, the computational control system, and a load apparatus. The key test cell has been introduced. The lubricity of the typical drilling-in system(PRD) has been evaluated using this instrument. The results showed that except for the filtration, the designed lubricity tester can effectively describe the friction behaviors in the whole dynamic drilling, by rotating the rod in the given environment.

Abstract: With a wide range of applications of vibration technology in mechanical engineering, the vibratory mixing has been a hot topic and one of concrete mixing mechanical’s development directions. As the previous study of the significance about vibration used into concrete mixing is only limited on the experience and the experimental data, the linear fitting of experimental data is made by using MATLAB language. Then, the impact and significance that of vibration and fresh concrete’s microscopic uniform density is analyzed.

Abstract: The material tracking management system in the magnetic pump assembly process is studied to the machine shop and assembly shop of a pump company as an example. The system mainly includes production line management module, assembly process management module, material tracking management module and work in process (WIP) tracking management module. In this system, the workshop visual management, real-time status information collecting on-site, materials status monitoring, and product life cycle file establishing are implemented. The functions of product assembly processes tracking can be realized, so that the traceability of the parts, components, WIP and products in the process can be achieved. The system ensures the material supply timely and equipment operation normally in the production processes.

Abstract: In order to ensure the performance of new products, a performance testing system including the design principle, design of hydraulic system and establishment of the computer data acquisition and processing system is given, which can be used to simulate the actual working conditions of a variety of hydraulic components and also used for the loading test. According to application, it shows that the performance testing system can work as an effective approach for quality checking for the new produced hydraulic components before they were put into the market.

Abstract: With the development of construction technology, the increasingly high performance requirements for tower crane, its technical performance, strength and longevity is particularly important. The metal structure is an important part of the tower crane, which bears the dead weight of the tower crane and a variety of the work of external loads. Strength, stiffness and stability are used to ensure safe and reliable work of the tower crane; otherwise, major accident may happen. With the tower crane to the development of large, heavy load and ultra-high, the test of the structure is particularly important. The research on the virtual test technique of tower crane jib in this paper bases on the characteristic parameter extraction of the jib structure, using the parameterized APDL programming language of finite element software ANSYS to do statics analysis by model building, and complete the virtual text of the jib. Finally obtain the corresponding results data of the actual test inspection and the location as well as the virtual test value of the most dangerous point, to determine the safe reliability of the jib structure and the rationality of material use.

Abstract: This paper introduces the function and basic process of UG movement simulation module UG/Motion, establishment the virtual model and simulation model of Mountain High Altitude Work Vehicle and motion simulation on it, simulation the practice movement of Mountain High Altitude Work Vehicle and obtains motion law and the parameters, and output simulation results through animation and chart. Practice shows that use UG / Motion for motion simulation is an effective aid for mechanical design, and improve work efficiency and perfect the design.

Abstract: Ventilator diffuser with appropriate structure can improve the character of the diffuser . Building models of the log spiral diffusers of ventilator were classified and combined according to the length of post catheter, the condition whether the entrance bucket has been installed or not, and the length of the entrance bucket. Based on EFA software for hydrokinetics, the inner flow field of all combined diffusers were simulated and the related data were analyzed. In this way, graph of the static pressure coefficient (Cp), the atmospheric pressure coefficient (Cpa) and the diffuser efficiency (η) will be concluded under the work condition of every combination. By numerical analysis， an issue that the length of postpositive catheter, the condition whether the entrance bucket has been installed or not, and the length of the entrance bucket influent performance of the diffuser will be concluded. The issue studied would be a helpful reference for design to the log spiral diffuser of ventilator and for research on energy -saving.

Abstract: To improve the driving ability of gas and light fluid which is sensitive to the temperature change, based on the system resonant principle a novel kind of piezoelectric resonant diaphragm air pump has been proposed. Experimental results indicate that the maximum flow rate is 1650ml/min when the sinusoidal AC driving voltage is 200v, the vibrating spring thickness is 0.6mm, the adjusting spring thickness is 1.4mm, and it was 0.5 as the radius ratio of the rigidity transfer vibration piston and the diaphragm.

Abstract: In order to measure the fatigue property of the small and hard brittle components working under conditions of the little amplitude, high frequency force, a novel kind of resonant high frequency fatigue testing machine which is driven by the piezoelectric vibrator (PZT、PLZT or PMN) has been proposed. Firstly, the working principle of the piezoelectric resonance high frequency fatigue testing machine is analyzed, and the dynamic model of the fatigue testing machine is established to get the systemic dynamic characteristics. Then a prototype is designed and produced. Finally, the maximum load on the sample is measured by the test with the machine. The results indicate that the maximum load on the sample is 23.4N-98.1N when changing the voltage (100V-250V) and the thickness of the plate spring (1.1mm-0.6mm). The prototype made in this paper is suitable for the tensile and fatigue testing with the load level mentioned above under the condition of little amplitude and high frequency force.