No abstract

Aimed at the problems of that present fault detection system for Auto-Loader can’t adapt the need of maintenance and support under field conditions, a set of portable intelligent fault detection was developed. On the basis of deeply analyzing Auto-Loader’s sequence control circuit and operating principle, the system overall design plan was built up; circuit of the power, data acquisition circuit, mutual interface circuit and other hardware were designed, anti-interference technology was studied; Data analysis software of upper computer system was developed by Visual Basic, the interface was used and studied briefly, suitable for every level’s technical staff. The example of fault detection of Auto-Loader’s program control box has indicated that detecting instrument was practical.

Aiming at the fact that the current method of designing elastic coupling in swashplate engine is deficient, and the vibration damping effect is inadequate, a new method for optimization design of coupling is put forward based on back propagation artificial neural network and genetic algorithm(BP-GA). Firstly the dynamics model of swashplate engine shafting is set up, and the samples are gained by numerical simulation, then the non-linear mapping relationship of elastic coupling designed parameters of the objective function is established with BP neural network, finally the trained network is called back by GA to make global optimization. The optimization results show that the global optimal resolution can be searched rapidly and correctly with the method, besides, the method is precise, convenient and applicable.

Friction property plays an important role in the operating process of engine, the analysis and discuss about friction property can help to improve the operating performance of engine. Based on the basic structure of swash-plate engine, the sphere rolling friction model and the roller rolling friction model were established, and corresponding formulae of the rolling friction force and the rolling friction coefficient were deduced. Then as an application, we employed the exact parameters of a swash-plate engine to calculate the sphere rolling friction force, the sphere rolling friction coefficient, the roller rolling friction force and the roller rolling friction coefficient. According to comparison, we concluded that roller rolling friction force was far less than sphere rolling friction force, and roller rolling friction coefficient was far less than sphere rolling friction coefficient. Furthermore, we proposed two topics which would be our next study concerning engine friction property: friction-induced heat, and high temperature influence on friction property.

Compared to condensed phase, effect of pressure on molar formation enthalpy for gas phase can not be ignored. To study calculation method of molar formation enthalpy for real gas, calculation formula of isothermal enthalpy difference is deduced under temperature and pressure coupled interaction by SHBWR equation of state, and whose applicability inspection is finished by experimental data of molar formation enthalpy for superheated steam. Results show that, calculation accuracy of model increases along with the increase of temperature, but decreases along with the increase of pressure. When working temperature is more than 800 K, the established model can calculate molar formation enthalpy for real gas accurately. Steady state properties of a thermal power system is analyzed based on the established model according to Hesss Law, result show that, heat flux of the system increases under pressure action, and mass flow rate of hydrogen the system needs decreases at the same time.

The technology of applying aluminum-water reaction to underwater vehicle is analyzed combining with the energy identity of metal fuel and different aluminum powders. The present research situation and development foreground are studied.

Contrast the energy properties of many kinds of chemical propellants, it is obvious that the metal fuel reacting with water has huge superiority and vast application foreground. Under the hypothesis condition, the burning model of the metal fuel reacting with water is analyzed. The energy properties of the metal fuel are researched through the way of thermodynamics computation, containing the burning time, reaction principle, and the reacting temperature.

In order to conduct a comprehensive analysis and optimization improvements of the swash-plate engine, it is necessary to analyze and discuss the motion of the swash-plate completely. Based on the motion model of the piston and the connecting rod of the engine, the motion tendencies were simulated. The results suggest the circumferential distance can cause vibration, noise, and rough running of the piston and the connecting rod in the operating process. Besides, the inertia forces/moments and the unbalanced motion are considered to be the main sources of the vibration and noise. On the basis of the results, we propose a “∞” guide groove, which can reduce the vibration and noise of the swash-plate engine, to improve the kinematical parameters.