Key Engineering Materials Vol. 620

Abstract: With the increasing of the large-size and overload of highway transport vehicles, the riding quality and the service life of pavement engineering are facing with a rigorous challenge. According to maintenance experiences from various countries in the world, adopting a reliable pavement preventive maintenance (PPM) measure is an effective method to keep the pavement with a good service level with the less expenditure of capital. The selection plan of the optimal measure is one of the critical aspects of the PPM technology. Whether a PPM measure is suitable or not is closely related to the PPM technical features, the pavement conditions and the traffic service levels. The purpose of the paper was to put forward the principle, method and procedure of the optimal PPM measure selection in terms of the specific features of asphalt pavements based on the decision matrix analysis and the equivalent annual cost method. The analysis results of a project level case demonstrates that the micro surfacing technology is the most suitable PPM measure to match the practical pavement conditions of the Puxing Road.

Abstract: Through extensive literature research, this paper from the principle of acoustic emission technology, development and application of acoustic emission technology at home and abroad, the characteristics of acoustic emission technology, acoustic emission instrument classification, structure and technical indicators of acoustic emission technique is applied to the aspects of pavement structure defect diagnosis about the prospect of the system in this paper. Introducing the SAEU2S acoustic emission system structure and technical indicators of acoustic emission instrument applied in pavement structure for the future defect diagnosis recognition provides the reference. Research results objectively show the non-destructive testing technology for pavement maintenance performance detection technology advantage, basic principle and method of then for pavement dynamic maintenance tracking and evaluation of real-time traffic all the way, maintenance decision information and the realization of the institutionalization of laid a foundation.

Abstract: In this paper, Finite Element Technology is applied to study the vibration state of violin sounding box using numerical simulation. By means of geometric modeling for the complicated shape of violin sounding box and Finite Element Analysis, the structural parameters of violin box, including thickness of violin plate, height and distribution and change of the shape of arch in front plate geometry, status of bass bar and sound-post etc, are investigated for their influence on vibration patterns and frequency response of violin box. Experiment is carried out for measuring the frequencies responses of violin box to verify the results of the Finite Element Analysis. This research provides a feasible way of theories for violin makers to improve the vibration characteristics of violin.

Abstract: This article investigates the flexible job-shop scheduling problem (FJSP) with multi-uncertain. A proactive-reactive scheduling mechanism is put forward to against the fluctuating process time and equipment breakdowns. This mechanism consists of two stages, including proactive scheduling stage and reactive scheduling stage. In the proactive scheduling stage, the redundancy-based technique is used to generate robust baseline schedules; in the reactive scheduling stage, a reactive scheduling is adopted to rectify the predictive scheduling to adapt to the occurrence of machine failures. Based on this, an integrating algorithm is presented with the goal of the make span. Numerical experiments show that the proposed algorithm has a better performance than Genetic Algorithm (GA) on flexible job-shop scheduling problem under processing time uncertainty and the reactive scheduling algorithm can handle the equipment breakdown with little robustness lost.

Abstract: With the rapid development of information and advanced manufacturing technology, the number of vehicles made by manufacturing enterprises suppliers has substantial increase, and the vehicle management issues become increasingly prominent .Now, since a lot of vehicles factory is lack of effective management practices, slow plant vehicle turnover, uneven loading and unloading area of the factory, and the crowded confusion of factory logistics is more and more serious. In order to improve the management level, to strengthen the efficiency of loading and unloading the vehicle supplier and the protection of the safety of a vehicle plant in the region, the subject will design a vehicle management system with a higher degree of automation. Vehicle identification control system is designed to establish the plant area and unloading vehicle management system management system, building intensive management. These include some of the following features: Vehicle intelligent, automated management of the system is the main objective. This includes the following specific functions: vendor vehicles and staff vehicles holding the legal RF card can pass; others no relevant RF card issued by the administrator cannot access, unless having obtaining a temporary card from the administrators. System must be able to record the time of entering and leaving the factory; according to the state of unloading points, system allocates the unloading point for vehicle distribution, and provide guidance automatically; vehicle access information can be queried at any time.