Research on Crosswind Stability of FSAE Racing Car with Rear Wing at Different Attack Angles

2012 ◽  
Vol 152-154 ◽  
pp. 737-742 ◽  
Author(s):  
Jun Ni ◽  
Si Zhong Chen ◽  
Da Feng ◽  
Xu Jie Wang ◽  
Jia Xin Hao
Keyword(s):  
Virtual Prototyping ◽  
Aerodynamic Characteristics ◽  
Attack Angle ◽  
Feasible Method ◽  
Body Model ◽  
Rear Wing ◽  
Air Resistance ◽  
Crosswind Stability ◽  
Virtual Prototyping Technology ◽  
Multi Body

In order to analyze the performance of a certain FSAE racing car with rear wing at different attack angles by virtual prototyping technology. The multi-body model of a FSAE racing car which takes non-linear factors into consideration was built by applying ADAMS/Car. The correctness of the model is verified by comparison with the actual experiment result. By the simulation of the air resistance and lift characteristics of the rear wing, a feasible method to building the aerodynamic characteristics of the rear wing in multi-body model was proposed. Based on these, the crosswind stability of FSAE racing car with rear wing at different attack angles was analyzed, the result shows that the effect of crosswind is reduced with the increase of the attack angle of the rear wing.

Simulation and Analysis of Frame Structure of Military Transport Truck

2011 ◽  
Vol 291-294 ◽  
pp. 2237-2240
Author(s):  
Guo Nian Yao ◽  
Hai Ying Huang ◽  
Li Juan Wang
Keyword(s):  
Virtual Prototyping ◽  
Frame Structure ◽  
Vibration Modes ◽  
Three Dimension ◽  
Force And Motion ◽  
Body Dynamics ◽  
Virtual Prototyping Technology ◽  
Multi Body ◽  
High Credibility ◽  
Processor Module

In order to design the vibrator with the similar structure to military transport truck, which will be used in simulating transport environment and evaluating the transportation properties of the tested product, three-dimension model of overall structure of truck frame, crossbeams and floor is established with ADAMS/View based on multi-body dynamics theory and virtual prototyping technology. Post-processing of the simulation and analysis results is executed with ADAMS/Post Processor module with a military truck model in the study. According to the bump of vehicle during transport and the chassis vibration, the constraints, force and motion accord with the actual transport are put on the model. Vibration modes of all orders and the spectrum are gained and analyzed in detail. The results indicate that the simulation is consistent with the actual transport, which shows the simulation of the overall frame structure owns high credibility.

scholarly journals Numerical Investigation on Handling Stability of a Heavy Tractor Semi-Trailer under Crosswind

2020 ◽  
Vol 10 (11) ◽  
pp. 3672 ◽  
Author(s):  
Qianwen Zhang ◽  
Chuqi Su ◽  
Yi Zhou ◽  
Chengcai Zhang ◽  
Jiuyang Ding ◽  
...  
Keyword(s):  
Lateral Displacement ◽  
Aerodynamic Characteristics ◽  
Lateral Acceleration ◽  
Yaw Rate ◽  
Body Dynamics ◽  
Crosswind Stability ◽  
Computational Fluid Dynamics Cfd ◽  
Multi Body ◽  
The Relationship ◽  
Lateral Area

Due to the large lateral area of the trailer and variable road conditions, the handling stability of a heavy tractor semi-trailer under crosswind is very important for road safety. In this present work, numerical simulation is performed to study the crosswind effects on handling stability of a tractor semi-trailer. The aerodynamic characteristics of the tractor semi-trailer under different crosswind were computed by computational fluid dynamics (CFD). Then, mathematical models to reveal the relationship between the aerodynamic forces and crosswind were constructed to serve as inputs of the multi-body dynamics to analyze the handling stability under crosswind. The performance of crosswind stability is evaluated by the response of lateral acceleration, yaw rate and the lateral displacement. The lateral acceleration and yaw rate were decreased by a maximum of 14.6% and 16.5% compared to the truck without the deflector, which showed that the crosswind aerodynamics and stability were obviously improved.

Study on Dynamic Performance of Tower Crane Based on ADAMS Multi-Flexible-Body

2012 ◽  
Vol 479-481 ◽  
pp. 1504-1509
Author(s):  
Chun Hua Zhao ◽  
Shi Jun Chen ◽  
Jin Zhang ◽  
Xian You Zhong ◽  
Nu Yan
Keyword(s):  
Fault Diagnosis ◽  
Natural Environment ◽  
Dynamic Performance ◽  
Virtual Prototyping ◽  
Virtual Prototype ◽  
System Level ◽  
Flexible Body ◽  
Tower Crane ◽  
Body Model ◽  
Virtual Prototyping Technology

When working, tower crane is affected by natural environment and is subjected to complex various loads. So it is not very easy to analyze its dynamic performance at system level. Some researchers have done some work as to simulation and analysis of tower crane, in order to study its dynamic performance. While much of their work based on grid body model but not flexible body model. This paper used SolidWorks and ADAMS to build the virtual prototype of a tower crane based on ADAMS flexible body. After the co-simulation, which joined ADAMS with SolidWorks, force of the connection between tower crane base and the strengthened section of the crane was recorded and analyzed. And so was the acceleration of the tower crane’s lifting rig. Succeeding in the application of Virtual Prototyping Technology based on ADAMS flexible body, this study can be used to direct the work, operation and fault diagnosis of tower crane, and lay a basis for further studies.

Numerical Analysis of an External Flow-Field around a Formula SAE Car Body Based on FLUENT

2014 ◽  
Vol 1039 ◽  
pp. 17-24 ◽  
Author(s):  
Xiao Han Cheng ◽  
Shan Ming Luo ◽  
Xue Feng Chang ◽  
Dan Xie
Keyword(s):  
Flow Field ◽  
Drag Coefficient ◽  
Static Pressure ◽  
Fluid Dynamic ◽  
Aerodynamic Characteristics ◽  
External Flow ◽  
Attack Angle ◽  
The Body ◽  
Formula Sae ◽  
Rear Wing

This paper proposed a method to analysis an external flow-field around a Formula SAE car. Firstly, the body of Formula SAE car was designed conforming to the FSAE rules using CATIA. Then, the model of the external flow-field around the vehicle was established using computational fluid dynamic technology. A comparative analysis of the aerodynamic characteristics was made for the body between the conditions of being without the wing package and being with the wing package under different attack angle to get the static pressure graph, the lift force and the drag force then worked out the drag coefficient and confirmed which is the most suitable angle for the wings. The results showed that: the static pressure of the front body, the front part of the tires and the driver’s chest and head is the highest; the body has good streamline since its drag coefficient is 0.385; the rear wings can supply 65% downforce, when the attack angle of the rear wing is set to 8°. Finally, the real mold was fabricated according to the above 3D model and the analysis results. The method presented in this paper can provide theoretical basis and technical parameter for the aerodynamic formation designing and amelioration of the Formula SAE cars. Also it has guiding significance for the design and aerodynamic analysis of the Ordinary Passenger car.

Robot Kinematics and Dynamics Analysis Based on Virtual Prototyping Technology

2012 ◽  
Vol 503-504 ◽  
pp. 752-755
Author(s):  
Zhi Ming Wang ◽  
Xuan Zhou
Keyword(s):  
New Technology ◽  
Rapid Development ◽  
Virtual Prototyping ◽  
Robot Kinematics ◽  
Kinematics And Dynamics ◽  
Dynamics Analysis ◽  
Robot Arm ◽  
Analysis Method ◽  
Virtual Prototyping Technology ◽  
Multi Body

Virtual prototyping is a new technology with the rapid development of computer technology. This paper put forward a systematic kinematics and dynamics analysis method based on virtual prototyping technology to simulate multi-body dynamics of robot arm. After the design requirements were introduced, the conceptual design of robot arm was then proposed, and the kinematics and dynamics analysis method was present with the simulation results. The kinematics and dynamics analysis of a robot arm was given as an example, which demonstrates that this method is obviously helpful for product design

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

2017 ◽  
Vol 63 (7-8) ◽  
pp. 466
Author(s):  
Seok Hong Park ◽  
Duc Viet Dang ◽  
Trung Thanh Nguyen
Keyword(s):  
Sliding Mode ◽  
Virtual Prototyping ◽  
Cost Savings ◽  
Ball Screw ◽  
Design Stage ◽  
Mechanical Structure ◽  
Tool Performance ◽  
Proposed Model ◽  
Virtual Prototyping Technology ◽  
Multi Body

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.

Іmprovement of driving-speed properties improvement of the method for selecting the parameters of the motor-transmission unit car

2021 ◽  
Vol 13 (1) ◽  
pp. 111-117
Author(s):  
Mikhail Podrigalo ◽  
◽  
Volodymyr Krasnokutskyi ◽  
Vitaliy Kashkanov ◽  
Olexander Tkachenko ◽  
...  
Keyword(s):  
Aerodynamic Drag ◽  
Dynamic Properties ◽  
Aerodynamic Characteristics ◽  
Gear Ratio ◽  
Design Stage ◽  
Transmission Unit ◽  
Air Resistance ◽  
Design Speed ◽  
Maximum Design ◽  
Engine Power

Aerodynamic characteristics have a major impact on the energy efficiency and traction and speed properties of the vehicle. In this article, based on previous studies of the aerodynamic characteristics of various car models, we propose an improved method for selecting engine and transmission parameters at the design stage. The aim of the study is to improve the dynamic properties of the car by improving the method of selecting the main parameters of the engine-transmission unit by refining the calculation of aerodynamic drag. To achieve it, the following tasks must be solved: to specify the method of selecting the maximum effective engine power; to specify a technique of definition of the maximum constructive speed of the car; to develop a technique for selecting gear ratios. The aerodynamic resistance to the movement of the vehicle is determined by the frontal coefficient of the specified resistance, the density of the air, the area of the frontal resistance and the speed of the vehicle. It is known from classical works on the aerodynamics of a car that in the range of vehicle speeds from 20 m / s to 80 m / s, taking the law of squares when assessing the force of air resistance, it is necessary to change the coefficient of frontal aerodynamic drag depending on the speed of the car. However, when carrying out calculations, this coefficient is taken constant, which leads to obtaining large values of the air resistance force at high speeds and lower at low speeds. There are two possible ways to improve the dynamic properties and energy efficiency of the car during its modernization (increasing the maximum design speed of the car by reducing the gear ratio in higher gear; reducing the maximum efficiency of the engine while maintaining the previous gear ratio in higher gear). As a result of the study, the method of selection (maximum effective engine power; maximum design speed of the car; gear ratios) at the design stage of the parameters of the motor-transmission unit of the car has been improved.

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