Applied Mechanics and Materials Vols. 128-129

Abstract: If static model of brake pipe pressure and torque model were used in brake system analysis and neglect their dynamic performance, it could cause bigger difference between simulation results and real condition. Some main dynamic models from experiments research are presented with brief introductions.

Abstract: According to GB/T 20913-2007 regulation, the finite element model of the offset deformable barrier (ODB) was built with beam and shell elements, and validated in the simulation of quasi-static compression test. In order to analyze the local deformation characteristics of the ODB model, a sled test was designed. A cylinder impactor of 110 mm in diameter was welded in front of the sled. It was used to impact the fixed ODB. The simulation model of this test was also built. The acceleration of the sled and the deformation of the ODB were measured in the test and compared with the simulation data. The results show that the ODB model with beam elements not only satisfies the demands of the regulations, but also has good local deformation characteristics. The efficiency of computing can be improved obviously with beam elements.

Abstract: The design and development of embedded configuration software is becoming one of the most important issues, the aim is to achieve mission-specific tasks and integrate supervisory management and control function in a collaborative way. In order to deal with the design and development of configure software for heavy-duty vehicle, object-oriented programming method is employed. At the same time, graphic-based display is realized using class object conception, and double buffering mechanism is proposed to improve graph display performance, furthermore, XML based serialization is employed to store the graph repository. The development environment and entire design process are based on the c sharp platform to take advantages of compatibility and scalability as well as meet further improvement. A snapshot of the graphic interface realization is shown to validate the design method.

Abstract: In the DPST (Direct Prototype Spray Tooling) sprayed directly prototype tooling technology of Huazhong University of Science and Technology , due to brittle characteristics of ceramic materials, there was low efficient in the processing of large mold .The study would obtain sprayed ceramic prototypes through Industrial robots directly milling of ceramic rough technology, However, clay ceramic prototype embryos after milling would occur large shrinkage in the high-temperature drying and consolidation. In the paper it has established a clay material mathematical model of heat and mass transfer in the high-temperature drying process, and carried out finite element simulation in the ABAQUS, obtained shrinkage deformation law of the clay material.

Abstract: In order to realize stable tracking under bumpy environment, the robot bionic eye constructed by spherical parallel mechanism with 3 DOF is designed based on the characteristics of human being’s eyes. ANSYS and ADAMS are utilized to conduct modal and kinematics property analysis respectively. According to the result of ANSYS modal analysis, the structure highly meets the demands of function and reliability, which lays the foundation for optimization and bump-resistance design. Through ADAMS kinematics analysis, displacement, velocity and acceleration curves of mechanism end effector were obtained, which provides reference for motion control and optimization design.

Abstract: Laser scanning technology can quickly capture a large area of high-precise 3D spatial data, and get the information of buildings, roads, vegetation and other urban objects from raw data. Based on this information general frame of these objects can be modelling. In this paper, an object-based classification method is proposed for urban objects based on LIDAR points: determine the contents of the objects contained in the scene; extract inherent features of different objects; establish objects feature knowledge database; combine and compare objects’ features and distribution of LIDAR points; derive a set of rule to express the point cloud classification which can be received by computer through fuzzy judgement. The method has been applied to LIDAR points by LYNX. The experiment results show that the proposed classification method is promising and usable.

Abstract: Harmonic resonance is composed of series and parallel harmonic resonance. It is closely related to the singularity of a network loop impedance matrix or node admittance matrix. It was found that such resonance phenomenon is associated with the singularity of the network matrix. The smallest eigenvalue of the matrix defines the mode of series harmonic resonance. This paper applies this eigenvalue theory and modal sensitivity analysis method to determine which network components contribute significantly to a series harmonic resonance phenomenon. Case study results further confirm the theoretical correctness and effectiveness. Thus, this practical method not only provides significant measures for series harmonic resonance manage, but also support theoretical and experimental bases for the component parameter design.

Abstract: All-regime performance simulation of marine diesel propulsion system is an important support for design of control system. An all-regime model for diesel propulsion system is established, including starting, braking, reversing, etc. The dynamic simulation models of propeller running across four quadrants and ship longitudinal motion are given too. A 76000DWT bulk carrier is selected as plant. The simulation results show that steady data of diesel are in good accordance with test-bed data, and dynamic data match to ship sea trial data in crash stop condition. The model is accurate and effective.

Abstract: Handling and stabilities is important for steer by wire (SBW) system. Firstly, a platform for SBW handling and stabilities analysis and parameter optimization with friendly graphic user interface (GUI) is built based on Matlab GUI technology. Secondly, three degree of freedom handling and stabilities model with steering angle as input is built and system stability is analyzed based on Routh-Hurwitz stability and poles methods. Then simulations are carried out to show effects of some vehicle parameters on handling and stabilities. Finally, the handling and stabilities sensitive parameters are optimized using genetic algorithm method to improve step responses and handling and stabilities.

Abstract: Hydraulic disc brake is essential for meeting the requirements of safety and economic efficiency during drilling and work-over procedure. To address this need, we have developed a programmable logic controller controlled novel hydraulic disc brake system with capability to apply control strategy similar to anti-lock braking system for hoisting system of truck-mounted drilling rig. This paper is to investigate the complicated interaction between the work clamp and the hydraulic control system. So designers can use this model to decide which control strategies are more suitable for the disc brake. This is demonstrated by modeling the advanced hydraulic system and simulating influential factors on dynamic characteristics of hoisting system disc brake, with the application of the Advanced Modeling Environment for Simulations of Engineering Systems. The method of modeling and simulation provides a simple, effective approach to studying hydraulic disc brake for hoisting system.