Papers by Keyword: Response Surface Method (RSM)

Abstract: Inside segregators, such as the air compressor, refrigerant and lubricant are mixed together. It is hoped that the lubricant could be reclaimed back to continue to work when it is expelled from the compressor. But designing of some kinds of air conditioning compressors has taken no notice of that, or it has lower separation efficiency. RSM (Response Surface Methods) is put forward to optimize the structure parameters so as to improve the separation efficiency. It is a collection of mathematical and statistical techniques, by which fewer experiments are needed to obtain the relationship between its parameters and their influences. Finally, by the use of computational fluid dynamics software, the optimum structure parameters are obtained, through which the better separation efficiency is available.

Abstract: To consider the complicated situation fully such as saturation, leakage flux and so on, and to make the generator size to meet the design requirements, we use the methodology of response surface method combined with center combination design to optimize the transverse flux permanent generator. At first, the optimization goals and the optimization design variables are set on the basis of the finite element model in the initial design. Then an optimized design model of the generator is built by the variable sequential combination response surface methodology. Experiment is arranged by the center combination design methodology, and optimal parameters are selected through response surface method. At last, we get all the structural dimensions of transverse flux permanent generator. The optimization makes the output voltage meet the design requirement.

Abstract: A study is undertaken to characterize the Neck Force (NF) of a CRS restrained 3 year old child occupant involved in lateral and oblique side impact. The Response Surface Method is used to map the parameter sensitivity upon the NF for impact speed of 32.2 km/h (20 mph) both individually as well as cross interactively. Design of Experiments is used with Latin Hypercube Sampling involving six predictors. A study of the response plots and statistical data obtained provide insights on the characteristic of each predictor with respect to the neck forces sustained. Greater parameter significance affecting neck forces is seen for narrow impact angles (φ ≤ 60°). Singularly, the impact angle parameter is revealed to be largely the most sensitive parameter to affect neck force especially at narrow angles. The critical range for this is identified to be between angles 50° and 70° while a secondary critical range is observed for angles below 34°.

Abstract: ANSYS software has provided complete and accurate solutions for composite laminate analysis and provided a set of special elements for different composite structures such as laminated plates, beams, solid structures and stiffeners. Fiber composite materials have been widely used to critical components of aircrafts, automobiles, mechanical, and marine structures. Since uncertainties associated with geometric tolerances, material properties, and boundary conditions widely exist in practical engineering problems. The probability approach is the most popular way to quantify uncertain parameters and perform the reliability analysis. The paper researches on the reliability analysis of the composite panels using ANSYS software. The numerical example is given, it is shown that the response surface method (RSM) can reduce the computational efforts comparing with Monte Carlo simulation (MCS).

Abstract: Reliability of laminate structure is deeply influenced by uncertainties such as fiber properties, loads and design sizes. It is very difficult to evaluate the reliability and sensitivity of laminate structure because that laminate structure is anisotropic and the limit state function (LSF) is a high nonlinear function. In this paper, reliability and sensitivity are evaluated by using first order reliability method (FORM), response surface method (RSM) and Monte Carlo simulation (MCS). The study aims to find a numerical method to evaluate the reliability and sensitivity of laminate structures efficiently and accurately. An example of laminate with a large number of variables is analyzed. The results obtained by using different methods are compared in terms of efficiency and accuracy. It is shown that FORM is not accuracy, and RSM has a very good accuracy and efficient in terms of reliability, but the accuracy of sensitivity obtained by using RSM is not good enough.

Abstract: The airborne vehicle would suffer from impact at landing. The magnitude of impact and stability of airborne vehicle are constraint parameters of successful landing. There was a lack of scientific explanation on the sensitivity of landing condition parameters. For overcoming the deficiency of classical sensitivity analysis, this paper describes the application of new technology for the sensitivity analysis. Based on the Finite Element and Response Surface method, the research on sensitivity analysis of landing condition parameters was proposed. The results have important significance in the design and optimization of airborne vehicle and airbags system. It can be also provide guidance for airdrop operation.

Abstract: A multi-body dynamic rigid-flexible coupling model of an in-wheel motor vehicle is built. This vehicle is based on a particular class-A car. An overall investigation of the influence of unsprung mass on vehicle ride comfort is conducted. With the increment of unsprung mass, overall vehicle ride comfort is decreased. The degradation of wheel dynamic load performance is most obvious. Suspension parameters are optimized based on the multi-body dynamic model of the vehicle and Response Surface Method. The suspension deflection and wheel dynamic load of the vehicle using optimized suspension parameters are improved significantly, while the body vertical acceleration increased slightly.

Abstract: This paper presents the practical multistage drying process of wet paddy with high moisture content in the range of 20 to 30%wet basis. The drying with infrared radiation was firstly used and followed by tempering and sun drying with variation of drying time for 2-6 min, 0-60 min and 180-300 min, respectively, in order to investigate their effects on milling qualities in terms of head rice yield and whiteness index. The response surface methodology was used to analyze the interaction effect of variables. The results showed that the optimum drying time with infrared radiation should not be up to 6 minutes. When overlapping the contour graphs, the superimposed response surface plots showed the boundary conditions in which head rice yield and whiteness index of milled rice were approximately equal to those of reference rice. The testing condition was finally selected to verify the proposed method. The results of milling qualities, cooking properties and pasting properties of tested sample were found to be acceptable.

Abstract: This paper presented a study about maximum stresses acting on the 4-dish solar collector system, which caused by excessive wind. For this, Central Composite Design and Response Surface Method were used on the basis of maximum stresses calculated by Finite Element Method. VisualDOC was used for CCD (Central Composite Design) and RSM (Response Surface Method), and Ansys was used for FEM (Finite Element Method) analysis. 9 cases of CCD points were selected and FEM analyses were conducted at these points. Based on these results, response surface function was constructed to model maximum stresses as function of wind velocity and thickness of dish support bar. In order to evaluate RSM model, arbitrary point were selected, and maximum stresses calculated by RSM were compared with those calculated by FEM.

Abstract: To study the relationship between the hydrolysis degree and calcium-binding capacity of whey protein by enzymatic hydrolysis, the response surface method was firstly used to investigate optimized the hydrolysis conditions of whey protein with protamex and flavorzyme. The optimum process parameters for the whey protein hydrolysis were as follows: Whey protein concentration was 5.0% (w/v), the ratio of protease to whey protein was 4.0% (w/w), the mass ratios of protamex to flavorzyme (w/w) was 2:1, and the reaction temperature was 49 °C. The hydrolysate obtained after the hydrolysis of 7 h, with a hydrolysis degree of 25.92%, possessed the highest Ca-binding capacity of 27.92%. Finally, the relationship between the hydrolysis degree and calcium-binding capacity was established and whey protein hydrolysate with high calcium-binding capacity was prepared, which can provide basic theories for the following optimization of chelation of whey protein hydrolysate with calcium.