Design of Double-Toggle Clamping Mechanism for Die-Casting Machine Based on the Multi-Body Dynamics and Finite Element Method

2013 ◽  
Vol 427-429 ◽  
pp. 179-186
Author(s):  
Kai Xuan Fu ◽  
Zhen Xing Zheng ◽  
Hua Wei Zhang
Keyword(s):  
Die Casting ◽  
Casting Machine ◽  
Design Parameters ◽  
Optimized Design ◽  
Force Coefficient ◽  
Motion Feature ◽  
Body Dynamics ◽  
Expansion Force ◽  
Multi Body ◽  
The Impact

Clamping mechanism was important for the working performance of die-casting machine. There were many factors such as various design variables and complex parameters during the design of the double-toggle clamping mechanism for which the high performance of die-casting machine could not be realized and the expansion force coefficient was small. In this paper, aimed to the design of the large clamping machansim for 25000KN die-casting machine, based on the analysis of the motion feature, the multi-body dynamics equation was construct, and the different design parameters in the optimal design math model were optimized and analyzed with the help of the MSC.ADAMS software. From result, after optimized, it was found that the expansion force coefficient was 23.59, the distance of stroke for the moving platen was decreased 20.3%; the clamping force was added to 3.25+e7N and the course of clamping mould was more stable which mean that the impact exerted on clamping mechanism was reduced. According to the optimized design proposal, the strength check for clamping mechanism was computed by numerical simulation, from the result, the design requirements were realized. And it supplied the technological reference for assurance of quality and performance of die-casting machine, based on which the prototype of 25000KN die-casting machine was manufactured.

Powered Two-Wheeler with Integrated Safety Using Recurdyn Multi-Body Dynamics

2014 ◽  
Vol 591 ◽  
pp. 193-196 ◽  
Author(s):  
B. Vijaya Ramnath ◽  
K. Venkataraman ◽  
Selvaraj Venkatram ◽  
Sohil Thomas ◽  
Muthukumarasamy Maheshwaran ◽  
...  
Keyword(s):  
Seat Belt ◽  
Body Dynamics ◽  
Holding Device ◽  
Depth Study ◽  
Improved Design ◽  
Accident Scenarios ◽  
Safety Considerations ◽  
Two Wheeler ◽  
Multi Body ◽  
The Impact

- Powered Two Wheelers (PTW) are very sensitive to environmental conditions and advancement in two-wheeler safety has not kept pace with the advancement in two-wheelers. The objective of our research is to bring about an improved design for powered two wheelers, analyzing the changes through simulation and thereby improving the safety considerations. According to the databases referred regarding accidents in depth study, it is observed that two-wheelers top the chart in number of accidents by a big margin and these accidents causes more fatal injuries. To save the rider, this paper proposes to constraint the rider along with pillion to the vehicle using “Leg holding device“ and seat belt. Side airbags are employed to absorb the impact of accident. The present safety system saves the rider in frontal collisions, while this research also focuses on side collisions. ISO 13232 standard accident scenarios were followed. For simulation of scenarios multi body dynamics software called RecurDyn is used. The improvement in employing safety measures is compared with its absence and results are plotted.

Kinematic Formulation of Mooring Platform During Collisions Based on Multi-Body Dynamic Theory

2018 ◽  
Author(s):  
Qiuwan Duan ◽  
Yang Yang
Keyword(s):  
Finite Element Method ◽  
Impact Force ◽  
Dynamic Theory ◽  
Kinematics Analysis ◽  
Body Dynamics ◽  
Load Analysis ◽  
Multi Body ◽  
The Impact ◽  
Analytical Expressions ◽  
Body Dynamic

When a platform is operating in a mooring, various vessels that frequently pass by result in severe accidental collisions of the platform. Thus, the kinematic response of the mooring platform should be investigated. A new analytical method, including a load analysis and kinematics analysis, is proposed in this paper. In the load analysis, the impact force is calculated using finite element method (FEM). In the kinematic analysis, closed-form analytical expressions based on multi-body dynamics are derived with the impact force as an input. Furthermore, the expressions are improved considering the fluid effect. A series of collision cases are implemented to validate the proposed method by FEM. The kinematic results solved by the proposed method agree well with FEM, which illustrates that the method is feasible and accurate. However, the proposed method taking around 30s, which is much shorter than 7200s by FEM, is proved to be more efficient.

Kinematics Characteristic Analysis and Structural Parameter Optimization of Twist Beam Rear Suspension

2011 ◽  
Vol 201-203 ◽  
pp. 1710-1713
Author(s):  
Ai Hua Tang ◽  
Jian Ping Tian ◽  
Xiao Xu Liu
Keyword(s):  
Linear Method ◽  
Rear Wheel ◽  
Structural Parameter ◽  
Optimized Design ◽  
Kinematics Analysis ◽  
Structural Behaviour ◽  
Characteristic Analysis ◽  
Rear Suspension ◽  
Body Dynamics ◽  
Multi Body

The multi-body dynamics analysis is an important method to analyze the movement and dynamics characteristics of a car in modern vehicle design process . The twist beam rear suspension which is for rear wheel steering was widely equipped on front engine rear wheel drive vehicles . The modeling of twist beam rear suspensions is always difficult to describe accurately for its unique structural behaviour . First of all , a non-linear method based on multi-body dynamics was used to establish the dynamics model of the twist beam rear suspension system by using the ADAMS/Car . Secondly, the kinematics analysis of the rear suspension was realized and the main suspension parameters (toe angle, camber angle and wheel base) were calculated by changing wheel travel by means of ADAMS/Car . Finally , the suspension was optimized . The result shows that integrative use of ADAMS/Car and ADAMS/Insight in the kinematics analysis and optimized design of the suspensions is rapidly and effectively to design vehicle suspensions .

Joint Modeling and Simulation of the Spindle System of Hammer Crusher Based on Finite Element Analysis and Flexible Multi-Body Dynamics. Part1: Modeling

2012 ◽  
Vol 630 ◽  
pp. 291-296
Author(s):  
Yu Wang ◽  
En Chen ◽  
Jun Qing Gao ◽  
Yun Feng Gong
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
System Simulation ◽  
Geometric Model ◽  
Body System ◽  
Element Analysis ◽  
Spindle System ◽  
Body Dynamics ◽  
Multi Body ◽  
The Impact

In the past finite element analysis (FEA) and multi-body system simulation (MBS) were two isolated methods in the field of mechanical system simulation. Both of them had their specific fields of application. In recent years, it is urgent to combine these two methods as the flexible multi-body system grows up. This paper mainly focuses on modeling of the spindle system of hammer crusher, including geometric model, finite element model and multi-body dynamics (MBD) model. For multi-body dynamics modeling, the contact force between hammer and scrap steel was discussed, which is important to obtain the impact force. This paper also proposed how to combine FEA and MBS to analyze the dynamic performance of the spindle system by using different software products of MSC.Software.

Research on Simulation and Reconstruction of Vehicle-Pedestrian Collision Based on Multi-Body Dynamics

2012 ◽  
Vol 487 ◽  
pp. 307-311
Author(s):  
Qiu Cheng Wang ◽  
Zhou Kai Xie ◽  
Wei Guo Liu ◽  
Hai Tao Xiao
Keyword(s):  
Traffic Management ◽  
Contact Stiffness ◽  
Major Type ◽  
Impact Speed ◽  
Vehicle Impact ◽  
High Fatality Rate ◽  
Body Dynamics ◽  
Pedestrian Accidents ◽  
Multi Body ◽  
The Impact

Vehicle-pedestrian collision is a major type traffic accident in China, which has been attracted close attention by people because of its high fatality rate. However, it is difficult for traffic management department to reconstruct such kind of accident. In this paper, a methodology for simulation of vehicle-pedestrian accidents based on the multi-body dynamics is presented. A multi-body dummy pedestrian model is established based on PC-CRASH programs, the features that represent the different parts of the pedestrian are defined such as geometry, mass, contact stiffness and coefficients of friction. And more the model is introduced to simulate the collision in a real case of vehicle-pedestrian accident in Hangzhou. Different impact speeds are discussed to predict the different throwing distance of the pedestrian. The relation curves and equations between pedestrian’s throwing distance and vehicle impact speed are established from regression analyses of the simulation data. Finally, the impact speed is estimated with correspond to the exact pedestrian throwing distance.

A Multi-Body Dynamic Model for Analysis of Localized Track Responses in Vicinity of Rail Discontinuities

2016 ◽  
Vol 16 (09) ◽  
pp. 1550058 ◽  
Author(s):  
H. Askarinejad ◽  
M. Dhanasekar
Keyword(s):  
Dynamic Responses ◽  
Railway Track ◽  
Design Parameters ◽  
Valuable Insight ◽  
Modeling And Analysis ◽  
Impact Forces ◽  
Noise Vibration ◽  
Multi Body ◽  
The Impact ◽  
Body Dynamic

Rail discontinuities are one of the main sources of wheel impact causing high levels of noise, vibration and stresses in railway track. Even though various multi-body train–track interaction models have been developed in the past decade, accurate modeling and analysis of the track dynamic behavior in the vicinity of rail discontinuities is rare in the literature. In this paper, formulation of a new explicit multi-body dynamic (MBD) model incorporating detailed wagon, wheel–rail subsystems and track containing a rail discontinuity (rail joint) is reported. The predictions of the localized track responses are validated using the data from two gapped rail joints in the field test. The validated model accurately determines the impact forces and dynamic responses. The simulation results provide valuable insight on the behavior of track in vicinity of a rail discontinuity, the sensitivity of the design parameters to the impact forces and the track dynamic responses currently unavailable in the literature.

scholarly journals Predicting Soccer Ball Target through Dynamic Simulation

2020 ◽  
pp. 6-18
Author(s):  
Ying Li ◽  
Junxian Meng ◽  
Qi Li
Keyword(s):  
Dynamic Simulation ◽  
Optimization Design ◽  
Orientation Angle ◽  
Optimization Method ◽  
Design Parameters ◽  
Dynamics Modeling ◽  
Soccer Ball ◽  
Body Dynamics ◽  
Multi Body ◽  
Ball Motion

The intelligent sports analysis of a soccer ball requires accurately simulating its motion and finding the best design parameters (position and orientation) to kick the ball.  An optimization method is proposed to plan, evaluate, and optimize the traveling trajectory of a soccer ball. The theoretical studies go through the multi-body dynamics modeling, dynamic simulation, and optimal objective modeling Based on Newton second law and Hooke’s law, the motion of a soccer ball is established as the time-dependent ordinary differential equations (ODEs). The expected target is expressed as a function of all design parameters. An example is used to simulate a soccer ball shooting a goal. The result of optimization design has given the most optimal combination of the design parameters, which involve theinitial velocity,initial projectile angle, andinitial orientation angle. This research provides a useful method in predicting the trajectory and adjusting the design parameters for the optimization design of a soccer ball motion.

Research on the EM Modeling of Optimization of PCB Grounded Via

2012 ◽  
Vol 195-196 ◽  
pp. 1153-1157
Author(s):  
Liang Qi Gui ◽  
Cao Yang ◽  
Jia He ◽  
Xiao Ping Gao ◽  
Ke Chen ◽  
...  
Keyword(s):  
High Speed ◽  
Signal Transmission ◽  
Wave Model ◽  
Simulation Software ◽  
Design Parameters ◽  
Optimized Design ◽  
Analysis Model ◽  
Scattering Parameter ◽  
Full Wave ◽  
The Impact

Grounded vias modeling is used to analyze the impact on the high speed PCB EMC and SI issues in three aspects, including theoretical analysis, simulator modeling and practical PCB test. In this paper, we discuss the full-wave complex scattering parameter model and full-wave model. Then the full-wave analysis model of the through holes for model validation and comparison are established, by using numerical simulation software HFSS and CST Microwave Studio. The initial test results on the practical PCB show that the analyzed method is reasonable and accurate. And optimized design parameters can ensure the continuity of the impedance of vias, and introduce lesser return loss and insertion loss. It is shown that the signal transmission performance is greatly improved with the grounded via added, which is helpful in specifying the manufacturing tolerance of via designs.

A Numerical Study on Pedestrian Kinematics and Injury Parameters in Bus Collisions

2014 ◽  
Vol 945-949 ◽  
pp. 35-39
Author(s):  
Shu Jing Zhao ◽  
Li Li ◽  
Fang Wang ◽  
Ji Kuang Yang
Keyword(s):  
Injury Risk ◽  
Numerical Study ◽  
Travel Speed ◽  
Design Parameters ◽  
Parameter Study ◽  
Initial State ◽  
Pedestrian Injury ◽  
Injury Severities ◽  
Multi Body ◽  
The Impact

This paper aimed at investigating the injury risk and the kinematics of pedestrians in collisions with buses. A mathematical model of a production bus was developed. A parameter study of the bus-pedestrian collision was carried out by using the bus MB (multi-body model) and a validated pedestrian MB model in terms of pedestrian postures, bus front design parameters, and different impact conditions. The results indicated that the initial state of pedestrians has significant influences on their kinematic responses. The impact speed and front stiffness has remarkable effects on pedestrian injury severities. Besides, restricted bus travel speed,lowered stiffness of bus front structure and reduced ground clearance could reduce the pedestrian injury risks.

Numerical Modeling of the Dynamic Behavior of Shredder Hammers and Correlation With Material Damage

2012 ◽  
Author(s):  
Eugenio G. M. Brusa ◽  
Nicola Bosso ◽  
Stefano Morsut
Keyword(s):  
Finite Element ◽  
Dynamic Behavior ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Industrial Plant ◽  
Strong Impact ◽  
Arc Furnace ◽  
Body Dynamics ◽  
Multi Body ◽  
The Impact

Pre-forming and fragmentation of the ferrous scrap used into the electric arc furnace for the melting process is a relevant activity for a steelmaking plant. Shredding machines are applied to suitably reduce the size of scrap. A set of hammers is connected to a main rotor. Rotation converts the high kinetic energy of each hammer into a strong impact against the scrap. Metallic parts are crushed and fed into the electric arc furnace. Damage of the hammer material is due to impact, vibration, wear and temperature. In addition fatigue affects its life. An effective prediction of the damage location as well as of its propagation in the hammer is rather difficult. A resident health monitoring system cannot be easily applied. Therefore a preliminary model was built to predict the dynamic behavior of each hammer in rotation and to compute the applied stress, while the impact is occurring. A rotor-dynamic analysis was performed by means of a Multi Body Dynamics and a Finite Element code, respectively. Magnitude, direction and frequency of the dynamic loads were first computed by the Multi Body Dynamics code. Stress exciting the hammer material was then computed by the Finite Element Method. Nonlinearities are crucial for the design operation. Friction among the materials, clearance between the pin and the hammer and the nonlinear behavior of materials are all relevant for the nonlinear dynamic response of the hammer. Numerical results were compared to some preliminary observations performed on an industrial plant. They allowed motivating the occurrence of cracks and wear effects in some critical points of the hammer. Some design criteria were defined and successfully tested to improve the performance of materials.

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