Abstract: In order to improve thermal comfort and avoid manually controlled split air conditioner, this paper proposes a remote intelligent control method based on the thermal comfort model. It first carries out an analysis of the thermal comfort model and simplifies objective function of the thermal comfort model, which contains only the temperature, humidity and the airflow rate of 3 parameters. In order to get the data of the three parameters of the environment the paper designs an intelligent control device with sensors and also provides the artificial immune method to optimize these three parameters. The test results show that the three parameters obtained in this paper are feasible and effective for the split air conditioner intelligent control. And this method can also be used for other similar equipment control system.
Abstract: A mobile test system for solar collector is introduced in this paper. The mobile test system for solar collector is a flexible and convenient testing device. Its design is much more difficult than that of a fixed test system for solar collector, because it needs consideration so as to make the test system accurate, reduce the volume of the test system, ensure the stability of the test system, increase corresponding removed devices and so on. For an effective integration of the test system and a vehicle, this paper discusses a mobile platform and its control system. A movement control of the subsystem adopts ac servo system based on PC. The system takes LabVIEW which is used in a virtual instrument as the development platform. And it employs a state machine model to monitor the process of removing and taking back for the mobile platform.
Abstract: When control charts are used to monitor a process, a standard assumption is that observations from the process at different times are independent random variables. However, the independence assumption is often not reasonable for processes of interest in many applications because the dynamics of the process product autocorrelation in the process observations. The presence of significant autocorrelation in the process observations can have a large impact on traditional control charts developed under the independence assumption. A method of monitoring little shifts in stationary autocorrelated process is discussed in this paper. At first, auto-regressive moving-average model is used to fit stationary autocorrelated process. Then, process autocorrelation can be removed by residual method, and exponentially weighted moving average charts are constructed to monitor little shifts of process mean and variance. Comparing with other methods, we can illustration that this EWMA residuals charts have better efficiency for stationary autocorrelated processes.
Abstract: In this article, according to the work principle of turbocharged two-stroke diesel engine, the characteristic of volume method model is referenced to package the diesel engine and the packaged model is calculated. According to the Matlab/Simulink software platform, the model will be combined to form a full mean value engine model and join speed controller to control diesel engine speed. The variation of diesel engine’s various performance parameter and the dynamic characteristics based on the speed control law will be observed, which means reaching better purpose of using diesel engine. In the process of mean value engine model design, joining a scavenging coefficient and improving the excess air ratio will increase simulation precision. By means of the correlation analysis, the diesel engine models complying with the control requirements can be determined.
Abstract: In order to increase automotive engine development efficiency and reduce the cost, a simulation model is often used, in this paper, with software AMESim the automotive engine lubrication system model was built to simulate the steady lubricant flow rate and pressure in the system at difference engine speed. Comparison between simulation and measurement on the test bench shows that the simulated results are in good accord with experimental data, the lubricant flow rate deviation is less than 3.5% and the pressure deviation at the measurement points is less than 4.0%, so it can be concluded that the model can be used to simulate the automotive engine lubrication system steady lubricant flow and furthermore optimize the system.
Abstract: This paper will study the vibration performance of resonator by using the engineering measurement, and try to quantify the sound quality of violin body with point impedance parameters so to provide an effective instruction method for the traditional manual of slap-up violin making.
Abstract: Wet activation is a very important step in silicon direct wafer bonding process and a optimized activation process is desirable to improve the surface hydrophilicity. Therefore the pivotal parameters of activation process were investigated which were volume ratio, holding time and treat temperature. A orthogonal experiment array was designed to reveal the effects of these parameters and the experiment results were analyzed by range analysis method. The analysis results indicted among those three parameters, everyone had intimidate relationship with surface hydrophilicity, which was indexed by contact angle. And higher concentration, longer holding time and higher treating temperature in possible value range were more desirable. Based on these conclusions, optimized activation process was desigened using which void-free bonding was realized.
Abstract: The problem of the stochastic admissibility for a class of nonlinear singular Markovian jump systems with time-delay and partially unknown transition probabilities is discussed in this note. The considered singular matrices Er(t) in the discussed system are mode-dependent. By using the free-weighting matrix method and the Lyapunov functional method, a sufficient condition which guarantees the considered system to be stochastically admissible is presented in the form of linear matrix inequalities(LMIs). Finally, a numerical example is given to show the effectiveness of the presented method.
Abstract: Supply contracts with options have been proposed to provide flexibility in supply chains with high demand uncertainties. In this paper, we consider a flexible supply contract model with bidirectional options in which a risk-averse retailer subject to high uncertain market demand and ordering decisions. We use the Conditional Value-at-Risk, a risk measure commonly used in finance, as a decision criterion and derive the retailer's optimal ordering decisions equations. In particular, we obtain closed-form formulae to describe the retailer's optimal behavior when the demand is uniformly distributed. Numerical examples analyze that how the risk aversion and contract parameters affect the retailer's optimal decisions. We also numerically prove that bidirectional options improve the retailer's profit under risk aversions, compared with the wholesale price contract.
Abstract: In order to take full account of the various factors in the car rental system, in this paper, the system dynamics method is applied to the car rental industry demand forecast.First, we analyze the main factors of the car rental system and its causal relationship, and then establish the dynamic model of the car rental system .The final model was validated using the Beijing car rental industry statistics .