Applied Mechanics and Materials Vols. 44-47

Abstract: In this paper, a novel control method by using parallel online mixing and supplying technology for glue system with multi-input, strong coupling and nonlinear was provided. The neural network controller design method is adopted to design the intelligent controller, in which one as the main controller and the other one as the identifier to revise main controller. Both advantages and disadvantages of the two neural network controllers were analyzed. Simulation results showed that both methods obtained a more favorable effect than the traditional control method.

Abstract: Progressing cavity pumping operation is one of the five main artificial lift technologies in current oil industry. It has been successfully applied to complex well conditions such as viscous crude oil, high sand-content oil and the offshore platform. To protect the key components effectively and achieve the longest economical service life of the pumping system, it is necessary to establish the flow rate monitoring system. Considering the rate of revolution affecting factors, over-current protection of motor during start-up and production-extraction balancing relationship, 3-grade control tactics was put forward. Also, some technical problems in the monitoring platform such as the collection of intake pressure and down-hole temperature signal, selection of hardware and web-based communication were introduced in detail.

Abstract: The combustion instability is an important reason for fatigue failure of the vibro-acoustic coupling combustion chamber thin-walled structure. The vibro-acoustic coupling equations of closed cavity are derived; The vibro-acoustic coupling coefficient matrix is calculated, it indicates that couplings between the acoustic modes and the structure modes are strictly selective; The vibro-acoustic coupling characteristics of the finite length simply supported closed cylindrical space and the combustion chamber flame tube modals are studied with the finite element method, and the little effect of modal coupling on frequency value is founded; The vibro-acoustic coupling test validation of the combustion chamber flame tube model is completed, and the results show that both the structure modes of the flame tube and the acoustic modes have the phenomenon of weak coupling.

Abstract: To cope with the challenges of traditional quality management system applied in individualized customization, product lifecycle oriented quality management system model for individualized customization, and corresponding functional modules and framework were all put forward. This mode dealt mainly with constructing and running product lifecycle oriented quality management system for individualized customization, furthermore, some of key enabling technologies were studied in detail, including collaborative quality design based on CSCW, dynamic process quality control, quality evaluation oriented to product lifecycle. The corresponding prototype system is developed, which was introduced to demonstrate the rationality and validity of the method as an example of some Heavy Machinery Ltd. It provided an effective method with enterprise implementing individualized customization.

Abstract: To cope with the problems of monitoring dynamic and variable quality variation for individualized customization, diagnosing the abnormal variation and adjusting the process at the right moment, is a difficult problem that individualized customization faces in process quality control. This mode dealt mainly with constructing and running dynamic quality control system, integrated several enabling technologies such as process quality analysis on-line based on similarity process, process quality diagnosis based on Elman and expert system of process quality adjustment. It is basis of realizing network, intelligent and automatic process quality control.

Abstract: A lung simulator utilizing flow track to simulate spontaneous breathing is presented as an alternative to the existed lung system in the medical patient simulator. The hardware of simulator is similar and updated from Meka’s paper. The existing lung system can be divided into two main types. One is traditional bellows driven mechanical lung system, the other is bellow-less lung simulator driven by carinal pressure that to be controlled. Our lung simulator is upgraded from bellow-less simulator. The research focus on the flow pattern the lung simulator generated which can image the lung mechanical factors directly. The flow pattern of the lung simulator is modeled by transfer function combined with respiratory muscle pressure, which is the target that the bellow-less lung simulator to track. The target flow pattern is tracked by PID algorithm widely used in automation filed and realized by Control Design and Simulation module in LabVIEW. We simulate the normal respiratory motion by flow track in this study. The pathology breath flow can be simulated by change of resistance, compliance or muscle pressure, which is easy to adjust in the LabVIEW program.

Abstract: The total power of vehicle power source is mainly decided by accelerating process. Because the current total power demand by the acceleration is not intuitive, in order to solve the shortcomings, this paper introduced an intuitive and reasonable solution method, which is derived in detail the theoretical equation. With the application of the equation, the total power of the vehicle can be calculated and designed directly through the acceleration demand, which has an important guiding significance for the automotive power design.

Abstract: This paper investigates the characteristic important to metal injection moulding (MIM) process via rheological behavior of MIM feedstock. A gas atomized spherical ZK60 magnesium (Mg) alloy powder and the binder of 60wt.% palm stearin (PS) + 40wt.% low density polyethylene (LDPE) were used in this investigation. Prior to mixing process, critical powder volume percentage (CPVP) was determined and subsequently four different feedstocks with powder loading of 62, 64, 66 and 68vol.% were prepared. The properties of the feedstocks were then analyzed rheologically. Here, the flow behavior index n, the flow activation energy E and the mold ability index αSTV of the Mg alloy MIM feedstocks were determined. Results show that feedstock with 64% powder loading has the best rheological properties and therefore it is considered to be the best for the injection moulding process.

Abstract: This paper proposes a categorical foundation for composing multi-resource in manufacturing systems. The composing procedures of overall system can be explained by pushout of category theory. The purpose of this paper is to resolve the issue involves in resource sharing, coordination and conflict for modeling the distributed manufacturing systems. We will propose a method for modeling discrete event system. The mathematical foundation lies in assuring that the constructed models have mathematical properties, e.g. consistency and completeness, and overcome the drawbacks of traditional function models, since it can show not only the static structure of resources but also the behavioral semantics of resources. The categorical notations and properties are to be expressed by a workcell example.

Abstract: A case-based research method was chosen with the aim to provide an exemplar of practice and test the proposition that the use of simulation can improve productivity. Three alternatives were performed by considering the aspects of operator, machine, and workstation to define productivity improvement alternatives for operation optimisation. The research determines the optimum result to improve the current operation system. The experiments on simulated and real data clearly indicate that the productivity improvement in the current performance can be achieved by re-allocating the number of operators and machines effectively instead of a combination. The paper presents a novel example of the use of simulation to estimate the production line performance. The paper highlights this method by addressing this operational issue and the likelihood of the success of the strategic decision to improve productivity.