An approximative mathematical model of the temperature controlling system has been constituted and simulated with various controlling strategy, according to the demanded function of the running Microwave Heating Asphalt Pavement Regenerate Repairer. From the result of simulation, it suggests that FPID Controller, which is of superior anti-jamming capability, overmatches Ordinary PI Controller, Traditional PID controller and Integration Separation PID Controller in dynamic characteristic. Consequently, this simulation of model offers a kind of valid method for the constitution of complicated system.
The paper design trial and monitor hydration temperature field in double-line railway box girder,simulate hydro-heat action of the cement and boundary conditions by FEA and imitate concrete temperature field; furthermore,analysis temperature field and difference in temperature inside and outside of this railway box girder under several special conditions,and come out temperature controlling principles.
Under the bad conditions of a chilly and windy climate, temperature controlling technologies in concrete construction and synthetic curing technologies such as steam heating and greenhouse heat preservation are adopted in order to insure the quality of hollow feather-walled high pier.
This paper is introduces the method of mass concrete construction on foundation slab in the main tower of Shenzhenwan Highway Bridge, it describes the measures, principles on temperature controlling, and contents, ways and effects of surveying.
According to the 4th contract project,the key construction techniques for offshore pile caps are introduced in the design,bottom enveloping of steel boxed cofferdam of pile caps,reinforcement concrete of pile caps,and the curing and temperature controlling of concrete and so on.
The techndogy of steel boxed cofferdam and the construction technic of once-pouring of structure concrete are adopted for offshore pile caps of Hangzhou Bay Sea-Crossing Bridge,the key techniques such as construction opportunity choosing,bond treatments of bottom enveloping, mix proportion of concrete and temperature controlling are described.
By deeply analyzing the temperature controlling parameters, the temperature dropping method, the stopping criterion of with-in circle and the stopping criterion of the algorithm, we propose a two-phase heuristic approach of the multi-depot location-routing problem based on the simulated annealing algorithm.
Average strengths in tension of 2.75×109 N/m2 (400×103 lb f/in.2) are reported using this temperature controlling method compared with 2.5×109 N/m2 (360×103 lb f/in.2) for similar diameter material grown using a constant power mode system.
A melt temperature controlling device, dependent on the infra-red emitted from the melt area at which the filament is withdrawn, was developed and used to grow filament of constant diameter in the growth rate range 2.5 to 7.5 cm/min.
In the developed model, the optimization module of the water distribution of secondary cooling zone was established according to the metallurgical criterion for billet and target temperature controlling principle.
In order to achieve that some modifications on temperature controlling and measunng systems have been introduced.
The material specification and quality requirements of asphalt pavement of Xi'an North Erhuan Road are introduced. The construction temperature controlling, asphalt mixing, transporting, paving and compacting are expounded in this paper.
The results of mass concrete structure temperature testing of Hedong Bridge were introduced.The reasons caused by concrete temperature were analyzed.The calculation of temperature stress and the principle of temperatuer difference controlling were proposed.The temperature controlling steps were formulated.
The paper design trial and monitor hydration temperature field in double-line railway box girder,simulate hydro-heat action of the cement and boundary conditions by FEA and imitate concrete temperature field;furthermore,analysis temperature field and difference in temperature inside and outside of this railway box girder under several special conditions,and come out temperature controlling principles.