Papers by Author: Zhao Liang Jiang

Abstract: Flatness of the face milled surface usually changes within a time of resignation after released from the fixture; and machining parameters have significance influence on the flatness of the milling surface. This paper studies the different machining parameters’ effects on the time-dependent flatness. The experiment was designed by Taguchi method. The experiment results reveal that the time-dependent flatness is influenced by machining parameter.

Abstract: An automatic test system of airflow performance in refrigerator transportation vehicle is proposed and constructed. The wind velocity field of loading area of empty refrigerated compartment is test in this research. The distribution characteristics of the tri-dimensional wind velocity field are analyzed. The plenty vortex areas in the back part of the recurvature area of the refrigerated compartment is beneficial to the uniformity of the temperature field, the flow fields of the loading area are obviously influenced by vortex areas and the face that the area below the return air inlet is most probably one of the temperature blind angles are concluded.

Abstract: The influence of stretched fixation on face milling-machined 6061T6 aluminum alloy, a widely used material in industry, was investigated in the paper. A unidirectional stretched fixture was designed and used in the face milling experiments. During the experiments, the pre-stress exerted on the work-piece increased from 0 to 220MPa with other machining parameters being constant. Surface topography, surface residual stress and flatness were measured. The results reveal that stretched fixation has significantly effect on residual stress, machined surface flatness, and roughness.

Abstract: Mixed-model assembly line (MMAL) sequencing is a typical problem that various models of a common base product are assembled on the same line. In this paper, we proposed products assembly sequencing in mixed-model assembly lines as a multiple-objective optimization problem with the objectives to minimize material consumption waviness, the total setup cost, and total task overlapped time. These three objectives are typically inversely correlated with each other, and simultaneously optimization of the three objectives is challenging. The multi-objective optimization algorithm based on non-dominated sorting particle swarm optimization (NSPSO) is designed. We conduct an extensive experiment study in which the performance of the proposed NSPSO is compared against non-dominated genetic algorithm (NSGA II). The computational results show that the proposed NSPSO outperforms NSGA II, significantly in large-sized problems.

Abstract: The satisfaction of customer requirements (CRs) is the objective of product configuration. A methodology Based on the Kano's model was proposed to explore customers' stated needs and unstated desires and to resolve them into different categories which have different impacts on customer satisfactions (CSs). The customer satisfactions are classified into group satisfaction and individual satisfaction, and each of them has three types with Kano theory. Group requirements items were selected frequently by the same kind of customers. Individual requirements were specified by the customer himself. Based on a combination of group satisfactions and individual satisfactions, the integrated satisfaction was determined. A case study is provided to illustrate the effectiveness of the presented method.

Abstract: Deformation mechanism of low-rigidity thin part caused by clamping force is studied in this paper. A coupled thermo-mechanical simulation process of aluminum alloy 6061 is developed using the finite element method with Abaqus. The results of simulation are verified by experimental measurements of cutting force and surface residual stress. Then using the model investigates the effect on residual stresses along the thickness of aluminum alloy 6061 load and unloadthe clamping forces. The deformation condition is also studied after removing fixing.

Abstract: A prediction model of deflection is presented. The Artificial Neural Network (ANN) is adopted, and ANN establishes the mapping relation between the clamping forces and the position of fixing and the value of deflection. The results of simulation of Abaqus software is used for Training and querying an ANN. The predicted values are in agreement with simulated data and experimental data.

Abstract: For the completeness and accuracy of customers' requirements information in the mass customization paradigm, a method of ontology-driven personal requirements elicitation based on scenario was proposed. Firstly, customer scenario model and product requirements model based on ontology theory were constructed respectively. Association rules were mined with Apriori algorithm using the method of metarule. Scenario ontology was mapped to requirement ontology completely. Then, customers' personal requirements information was elicited completely and accurately. Finally, industrial case study has been performed to demonstrate the practicality and effectiveness of the proposed approach.

Abstract: Work-piece elastic deformation caused by clamping force from fixture will lead to part bending or distorting, which is critical to lower its quality performance. In this paper, a novel zonal compensation method is proposed to compensate the work-piece elastic deformation through fixture layout optimization based on High Definition Metrology (HDM). The zonal surface flatness data of work-piece in fixture is obtained with densely optical measurement firstly. Then, they are reorganized according to the accuracy requirement based on the zonal distribution. Finally, the surface flatness compensation model based on fixture layout is made. The practicality and effectiveness of this new approach was verified using the case of Aluminum alloy 6061 part milling.

Abstract: The work-piece holding in the fixture will have elastic deformation under the effect of clamping force and the positioning of locators which will lead to poor quality. In this paper, after comparing the advantage of High Definition Metrology (HDM) with the traditional contact measurement metrology, the surface flatness measurement experiment scheme was designed based on HDM. Then, it was optimized with Design of Experiment (DOE). Finally, the work-piece elastic deformation caused by clamping force, its location and support location were analyzed using the case of Aluminum alloy 6061 part.