Virtual Prototype Technology Research Articles

Vibration response and parameter influence of TBM cutterhead system under extreme conditions

A cutterhead endures complex random loads when the TBM tunnels, which leads to structure excessive vibration, due to the extreme working conditions. So anti-vibration design is key in the cutterhead system design. In this study we established a virtual prototype of TBM mainframe system, comprehensively considering the spatial multi-point random excitations, split cutterhead structure and multidirectional support stiffness of the main bearing, etc., based on multi-body system dynamics and virtual prototype technology. For verifying the virtual prototype model, a TBM cutterhead vibration field detection system was constructed, to test the cutterhead accelerations and compare the simulation and measured results. The results show that the acceleration change rule by the two approaches is similar, and the maximum relative error is 55 %, keeping on the same order of magnitude, which illustrates the established model has certain reliability. Accordingly, an orthogonal test scheme for cutterhead radial vibration analysis was designed, to analyze the influence of different parameters on cutterhead vibration, based on the virtual prototype model. As indicated in the analysis, the parameter of cutter force had the greatest influence on cutterhead vibration, and then the pinion support stiffness and cutterhead rotating speed. Last, the cutterhead vibration optimal schemes in different directions were confirmed. The research results and methods can provide reference for TBM system parameters matching.

Dynamic Modeling of Large Complex Hydraulic System Based on Virtual Prototyping

In view of the problem of high failure rate, lack of fault samples and high cost of experiment of a certain type of artillery hydraulic system, the electromechanical coupling simulation scheme suitable for large and complex systems is proposed. Based on Virtual Prototyping Technology, a complete dynamic model is established by using MSC. Adams and MSC.Easy5 simulation software. The simulation proved the credibility of the model by the use of VV ＆ A. It lays the foundation for the dynamics simulation and fault simulation of the whole working process of the following hydraulic system.

Vibration Response of the Launcher under Impact Load

Vibration of the launcher would cause the initial disturbance of the missile in the launch process. In this paper, the rigid-flexible coupling system model was built on the platform of virtual prototype technology (VPT) based on the improved Craig-Bampton method. Numerical simulation data and experimental results are found to be consistent with each other. Rigid-flexible coupling system was verified to be able to provide valuable results to the research on kinetic, dynamic and vibratory characteristics. Vibration responses of girder and canister under different launching angle are simulated, and results show that increasing launching angle could reduce the vibration of canister and girder.

Participated Planning of Large Water Infrastructures through Virtual Prototyping Technologies

The design of large dams is a collaborative activity with relevant social and political implications. Planning such large infrastructures requires involving all the interested stakeholders, making shared decisions, tracing the design process. There are currently not many Virtual Prototyping tools to support this collaborative design process. In this paper, we propose a participated planning support system based on mobile and Augmented Reality technologies which allows different stakeholders to take part in the review of a large dam project through an application that automatically acquires information available online, allows all stakeholders to share information, and finally records everything for a subsequent analysis. The development of the application, as well as its use in two case studies and a user study, are described in the paper.

Elastic rail clip design development, based on virtual prototyping

Virtual prototyping technology is a powerful tool when exact design solution is needed, corresponding to various and sometimes controversial requirements. It is used widely for design improvement/optimisation (topology, shape, parametric), based on engineering analysis through numerical techniques (as Finite Element Method) that enables prompt and accurate solutions. Design development approach based on this technology becomes standard for many industries, including railway transport. Presented study is based on an industrial project for design development of elastic rail clip. It is entirely based on virtual prototyping to obtain adequate design solution. Design is required to achieve certain clip rigidity, at certain level of safety (mechanical stress), for certain design space. This is a typical task for design optimisation techniques and performed simulations include 3 design concepts, 11 design variants and more than 2400 parametric configurations to obtain 4 allowable design solutions. The study is a good presentation of virtual prototyping application for industrial purposes.

Simulation Analysis of Automatic Motivation Based on ADAMS

With the dynamic simulation software ADAMS as the simulation platform, the virtual prototyping technology is applied to the dynamic research of the grenade launcher. The virtual prototype model is established. The kinematic parameters of the main mechanism are determined by simulation and the automata, the simulation results are in good agreement with the measured values of the shooting test, which proves that the simulation results are credible and provide a theoretical basis for the subsequent design of the grenade launcher.

The safety research of road alignment based on virtual simulation technology

The application of virtual simulation technology in the design and construction of road provides a new way for the road design workers. For using virtual simulation technology to identify dangerous sections of roads that have been built and to provide technical support during the initial stages of road design, it is necessary to first research the reliability of virtual simulation experiments in road safety studies. The man-vehicle-road system model based on multi-body dynamics is proposed using the software of ADAMS/Car. Based on the roll and roll-over evaluation criteria, combined with speed consistency theory, the high risk and high driving load road sections are identified. Furthermore, the simulation results are compared with the measured results from six-dimensional sensor in order to verify the reliability of virtual simulation technology while applied for road shape designing. The comparison results can be seen that the simulation analysis based on virtual prototype technology of 12 sections accidents, ten with six component-based sensor anastomosis of real vehicle road test analysis section, the accident sections of results obtained from the two methods of alignment is 83.3%. The results show that the road risk prediction simulation based on virtual prototype technology can provide high reliability.

Hydraulic Ripper Computer Modeling and Simulation

It’s very useful to put the virtual prototype technology into hydraulic ripper, just for improving the product research and development efforts. A certain type of hydraulic ripper was simulated and calculated using CATIA and ADAMS software, the simulation system is set up, and the relevant parameters of hydraulic ripper are gotten; on this basis, a prototype model is compared with the reality. At the same time, a comparative analysis of simulation results and real results under certain conditions is used to verify the rationality of the prototype model, and the reference value of its products must build a good development platform for hydraulic ripper.

Design and Implementation of a Quadruped Bionic Robot Based on Virtual Prototype Technology

Design out a quadruped bionic robot with nine degrees of freedom. Conduct virtual assembly and trotting gait simulation on the robot by using NX software. Present the angular velocity and angular displacement curves of the diagonal two legs’ hip joints and knee joints, thus to instruct the practical assemble and control of the robot. The fact that the movement effect of the physical model is consistent with the simulation verifies the validity and practicability of virtual assembly and motion simulation. both.

Optimization of design for mechatronic system based on virtual prototyping technology

According to the traditional design method, in order to manufacture a mechatronic system, from the initial idea, the designer designs the mechanical system by CAD (Computer-Aided-Design), this system is then fabricated, finally, the system will be tested on the working condition. If the system does not work properly, the design of the system will be changed, and hardware is re-manufactured. This method is more time-consuming and cost for repairing and manufacturing hardware repeatedly. To save design time and reduce the cost of the manufacturing hardware as well as to optimize the design process of a mechatronics system, this paper introduces an engineering model it is called a virtual prototyping technology which allows optimizing the designs on the computer before manufacturing the test-bed system. Based on the concept of the system working, the mechatronics system is designed on SOLIDWORKS and then exported to the ADAMS software (Automated Dynamic Analysis of Mechanical System). The flexible element is also modeling and analysis in ANSYS software then exported to ADAMS. The integrated simulation in ADAMS environment is executed to investigate the dynamic behaviors of the mechanical system and design will be adjusted. Virtual prototyping model will then be exported to MATLAB/Simulink to develop the control strategies. Co-simulation results in some contexts to evaluate the effectiveness of the proposed mechatronic system before implementing on test-bed

Development of a Servo-Based Broaching Machine Using Virtual Prototyping Technology

Predicting machine tool performance at the design stage is one way to resolve the time issue and achieve cost savings. The objective of this paper was to develop a new non-hydraulic broaching machine using a servo motor, ball screw, and roll element linear guide using virtual prototyping technology. First, we developed a multi-body simulation model (MBS) of a servo-based broaching machine to investigate its dynamic behaviour. Then, an adaptive sliding mode proportional-integral-derivative (PID)-based controller (ASMPID) was proposed to conduct the broaching process. We then performed a co-simulation between the mechanical structure and virtual controller to investigate the ram body trajectory and identify the optimal control parameters. Finally, we manufactured a prototype machine to evaluate the simulation results and determine the benefits of the new system. Our results indicated that the proposed model, which includes a mechanical structure and intelligent controller, effectively improved broaching machine design. Therefore, this work is expected to improve the prototyping efficiency of new broaching machines.

Multi-body Dynamics Simulation and Analysis of Inertia Release Mechanism

For multiple work sections and complicated work conditions, Inertia Release Mechanism contains complicated contact surfaces of parts, it is hard to design and analyze with traditional methods. In this paper, the detailed structure model of Inertia Release Mechanism was designed with UG, and its virtual prototype model was established with LMS Virtual. Lab Motion. Based on the model, system kinematics and dynamics were simulated and analyzed. The simulation results revealed that with virtual prototype technology, the design level and efficiency of Inertia Release Mechanism can be enhanced. The model can also be used for structure optimum design.

Research on the Integrated Implementation of Mechanical Professional Curriculum Designs Based on Virtual Prototype Technology

For the problems such as lacking close relationship among these mechanical professional curriculum designs, curriculum knowledge division alone, without integrating the relevant knowledge and failing to highlight the characteristics of mechanical major, an integrated implementation system is established for the engineering practice teaching in view of the mechanical professional engineering certification requirements. This system breaks the relatively independent practice of these curriculum designs and fuses to form a whole, as well as brings innovation design idea into the curriculum design. For the target to solve complex engineering problems, the curriculum design and its content will be set in stages based on virtual prototype technology. The teaching reform can strengthen students' abilities such as operation, practical skills, problem-solving, exploration and innovation. So the reform project for mechanical professional curriculum designs is of important academic significance and engineering application value.

Supplementary Teaching Research of Mechanical Principles Based on Virtual Prototyping Technology

Mechanical principle is an important basic course for machinery majors, is a machine and institutions as the main research object of the course. To meet the needs of the complex machinery of the applied talents training, starting from the teaching problems existing in the current mechanical principles, this paper expounds the main process of auxiliary teaching by using virtual prototype technology. In shaping machine, for example, intuitive show the process of physical movement and the movement of each component, is helpful to deepen students' understanding of abstract theory, inspire the students' interest in learning, have achieved good teaching effect.

Analysis and optimization of drum washing machine vibration isolation system based on rigid-flexible virtual prototype model

In order to improve the calculation accuracy of vibration response in drum washing machine isolation system, a new CAE method is proposed for dynamics analysis and parameter optimization according to the rigid-flexible coupling technology of virtual prototype. With the vector loop algorithm, the motion differential equation of the vibration isolation system is solved based on Lagrange method, and the key parameters that affect the vibration response are acquired. In terms of simulation research, the modal neutral file (MNF) of the shell body is established by the software ANSYS for modal analysis, and it is exported into software platform ADAMS/Vibration to establish the rigid-flexible coupling model. Through the coupling model, the kinetic characteristics are calculated in continuous excitation frequency domain (0-20 Hz). The experimental verification is accomplished by LMS Test.Lab device, of which results shows that the rigid-flexible coupling simulation method is definitely accurate and feasible. Meanwhile, 15 “hot spots” of the shell body are obtained from the ADAMS/Durability module, which can provide an important basis for structure design. Then, the spring stiffness and damping coefficient is synthetically optimized by sensitivity analysis method with 9 time’s iterative calculation, which has a great significance for product development.

Investigation on Semi-active Suspension System for Multi-axle Armoured Vehicle using Co-simulation

<p>The objective of the study is to evaluate the performance of various semi-active suspension control strategies for 8x8 multi-axle armoured vehicles in terms of comparative analysis of ride quality and mobility parameters during negotiation of typical military obstacles. Since the cost, complexity and time precludes realisation of actual system, co-simulation technique has been effectively implemented for this investigation. Co-simulation combines advanced virtual prototyping and control technology which offers a novel approach to investigate the dynamics of such complex system. The simulations for the integrated control system along with multi body model of the vehicle are carried out for the control strategies, viz. continuous sky hook control, cascade loop control and cascade loop with ride control and compared with passive suspension system. The vehicle with 8x8 configuration is run on the real world obstacle profiles, viz. step, trench, trapezoidal bump and corrugated road and the effect of control strategies on ride comfort, wheel displacement and ground reaction is presented. It is observed that cascade loop with ride control in semi-active mode offers better vehicle ride comfort while crossing the said obstacles. The improved performance parameters are achieved through stabilisation of heave, pitch and roll motions of the vehicle through outer loop and isolation of vehicle level uneven disturbances through the fuzzy logic controller employed in inner loop.</p>

Physical assembly sequence optimisation for developing an integrated 3D reconstruction method

ABSTRACTIn 3D reconstruction application domains, for example, repairing relics, bone fracture surgery, the reassembly of fragmented objects is required. Intensive research has focused on virtual 3D reconstruction but very little attention was paid to the physical assembly process where original segments are dealt with. To obtain a good reassembly result with reduced damage risk, assembly error and operation time, it is not enough to only use a 3D virtual model or a physical prototype model as assembly reference. The assembly sequence and the assembly operation should be investigated. To support the physical reconstruction, an integrated method which uses both virtual and physical prototyping technologies with human interaction is proposed. This paper mainly discusses the physical assembly sequence optimisation which is the partial implementation of the proposed method. An experimental pilot case study is presented to demonstrate the importance and potential of the method.

Effect of friction coefficients on the dynamic response of gear systems

The inevitable deterioration of the lubrication conditions in a gearbox in service can change the tribological properties of the meshing teeth. In turn, such changes can significantly affect the dynamic responses and running status of gear systems. This paper investigates such an effect by utilizing virtual prototype technology to model and simulate the dynamics of a wind turbine gearbox system. The change in the lubrication conditions is modeled by the changes in the friction coefficients, thereby indicating that poor lubrication causes not only increased frictional losses but also significant changes in the dynamic responses. These results are further demonstrated by the mean and root mean square values calculated by the simulated responses under different friction coefficients. In addition, the spectrum exhibits significant changes in the first, second, and third harmonics of the meshing components. The findings and simulation method of this study provide theoretical bases for the development of accurate diagnostic techniques.

Dynamic simulation of seat suspension system with virtual prototyping technology

Dynamic simulation of seat suspension system with virtual prototyping technology

Virtual Design and Dynamic Simulation of Valve Trains

The valve train plays an important role in the engine, which has a great influence on engine performance and reliability. In this paper, valve trains are studied based on multi-body dynamics theory and virtual prototype technology. Multi-rigid-body dynamic model of the valve train is established with Adams software, and then simulation and calculation are carried out. Dynamic characteristics of the valve train are obtained including force and motion of each component. The research results have important theoretical significance and practical engineering value in the design, dynamic analysis and optimization of valve trains.