Simulation Analysis of Motor Vehicle Ride Comfort Based on Adams

2012 ◽  
Vol 224 ◽  
pp. 243-247
Author(s):  
Cai Bin Li ◽  
Fu Yun Liu ◽  
Ju Cai Deng
Keyword(s):  
Simulation Model ◽  
Motor Vehicle ◽  
Ride Comfort ◽  
Simulation Analysis ◽  
Simulation Method ◽  
Damping Force ◽  
Vibration Experiment ◽  
Heavy Truck ◽  
Vibration Simulation ◽  
Stiffness And Damping

Applying ADAMS to vibration control field of heavy truck. The vibration simulation model of a truck is established. With the simulation model, different acceleration responses under different suspension stiffness and damping force are simulated. The simulation result is close to the actual result. It shows that the simulation method is benefit to reduce the number of vibration experiment and to forecast the vibration response of heavy truck.

Study on Impact of Powertrain Mounting Stiffness on Vehicle Vibration Characteristics

2012 ◽  
Vol 605-607 ◽  
pp. 1154-1157
Author(s):  
Yu Zhuo Men ◽  
Hai Bo Yu ◽  
Hua Wang ◽  
Liang Xu
Keyword(s):  
Simulation Model ◽  
Simulation Analysis ◽  
Drive Shaft ◽  
Dynamics Simulation ◽  
Interpolation Function ◽  
Vibration System ◽  
Nonlinear Characteristics ◽  
Model Reliability ◽  
Simulation Results ◽  
Stiffness And Damping

ADAMS was used to establish the dynamics simulation model of a truck vehicle vibration system, while the engine, drive shaft and tire excitations were added to the model. For nonlinear characteristics of rubber mounting components stiffness and damping, input was conducted by the use of interpolation function SPLINE. Through the comparison of road tests and simulation results, the model reliability was verified and simulation analysis was conducted on this basis. The results show that reasonable selection and matching of powertrain mounting stiffness, mounting position could effectively improve the performance of vehicle vibration system.

scholarly journals Vibration transmission simulation model of a seated vehicle passenger

2021 ◽  
Vol 2120 (1) ◽  
pp. 012009
Author(s):  
I Ho ◽  
N Z Abu Bakar
Keyword(s):  
Simulation Model ◽  
Human Body ◽  
Ride Comfort ◽  
Real Life ◽  
Vertical Vibration ◽  
Suspension System ◽  
Human Body Model ◽  
Peak Displacement ◽  
Moving Vehicle ◽  
Vibration Simulation

Abstract The paper presents development of vertical vibration simulation for a seated passenger in a moving vehicle is resulting from the bounce effect of the vehicle under various conditions. Although extensive research has been conducted in this field of study, the existing analysis were conducted on either the suspension of vehicle or the human body and not both. In this paper, the simulation model consists of three sub-systems, namely, vehicle suspension, seat suspension and human body model in which the vertical vibration is transmitted. By incorporating these sub-systems into the simulation, a correlation between mechanical and biological aspects can be formed between the three sub-systems. The transmission of vertical vibration in the validated simulation model provides a more realistic approach which can result to a better comparison to the real-life scenario. Parametric analysis of passive suspension system shows that lower mass ratio, higher stiffness ratio and lower damping coefficient results in better ride comfort. The incorporation of variable damper into the suspension system shows significant improvement in settling time, peak displacement and velocity, lesser discomfort rating and higher safety in passenger body.

Modeling and Simulation of Aircraft Nose Landing Gear Emergency Lowering Using Co-Simulation Method

2012 ◽  
Vol 215-216 ◽  
pp. 1213-1218 ◽  
Author(s):  
Xiao Hui Wei ◽  
Yin Yin ◽  
Heng Chen ◽  
Hong Nie
Keyword(s):  
Hydraulic System ◽  
Simulation Analysis ◽  
Impact Load ◽  
Simulation Method ◽  
Critical Value ◽  
Landing Gear ◽  
Peak Oil ◽  
Dynamical Models ◽  
Damping Force ◽  
Ground Test

This paper builds dynamical models and hydraulic system models of retraction/lowering of some regional aircraft nose landing gear respectively based on the software LMS VL motion and AMESim. The simulation analysis result was proved to be credible by checking with that of ground test. The peak oil return pressure with the critical damping force can be obtained by analyzing the hydraulic damping characteristic of actuator cylinder during landing gear emergency lowering based on methods of estimation and co-simulation. The results indicate that the damping characteristic of actuator cylinder plays an important role in emergency lowering. Only when the damping force breaks through the critical value, can the landing gear succeed in emergency lowering and being locked. However, the little damping force will result in great impact load while lowering. Thus, damping force should be changed only when emergency lowering.

scholarly journals ANALISIS JUMLAH PETUGAS OPTIMUM DENGAN MENGGUNAKAN METODE SIMULASI ANTRIAN

2017 ◽  
Author(s):  
Tri Tri Hernawati
Keyword(s):  
Simulation Model ◽  
Simulation Analysis ◽  
Simulation Method ◽  
Optimal Number ◽  
Minimal System ◽  
Service Rate ◽  
Service Discipline ◽  
Optimal Conditions ◽  
Alternative Solutions

Improving the quality of public services involving many absolutely necessary. Similiarly, in PT.PLN(Persero) Branch South Medan Rayon providing services costumers in the payment of electricity of bills. Although the service is quite good ad fast, the queses still common. Therefore, this study tries to provide alternative solutions to address the queue by applaying simulation method . Simulation analysis begin with collecting the data rate and the rate of arrival costumers service and continued analyzing the characterisrics of the service rate and the rate of arrival of acquired characterisrics of costumers. From created a simulation model that approaches the accrual conditions and proceed with the vaiduty test . Based on research conducted can be determined characteristics of queing models, namely random costumer arrivel patterns, time waitress exponential , service discipline FCFS (First Come First Served). To determine optimal number of officers carried out and optimal simulation. Optimal conditions obtained 6 (six) officers and six lines with cisideration of time in the most minimal system. By ontaining optimal conditions , we can made the allocation of officers eachtime interval in proportion to the number costumer arrivals.

scholarly journals Dynamical Model And Ride Comfort Simulation Analysis Of Distributed Drive Electric Vehicle

2018 ◽  
Vol 232 ◽  
pp. 02058
Author(s):  
Wenwen Xiao ◽  
Huanhuan Zhang
Keyword(s):  
Electric Vehicle ◽  
Electric Vehicles ◽  
Dynamic Load ◽  
Ride Comfort ◽  
Simulation Analysis ◽  
Damping Ratio ◽  
Design Variables ◽  
Ratio Speed ◽  
Distributed Drive Electric Vehicle ◽  
Stiffness And Damping

This paper analyzes the ride comfort of distributed electric vehicle, simplifies a distributed electric vehicle to a fifteen degree of freedom model, and deduces the vibration differential equation by Newton 's second theorem. In this paper, a new type of hub motor vibration reduction system is established, which effectively solves the problem of large unsprung mass of distributed drive vehicles and provides a new method to improve the ride comfort of distributed drive electric vehicles. The genetic algorithm mainly regards the stiffness and damping of the suspension, hub motor damping system and tire as the design variables. The sum of root mean square value of suspension disturbance degree, body acceleration and wheel dynamic load is taken as the optimization objective function, and the limit stroke of wheel up and down and wheel dynamic load limit are taken as constraints. In order to verify the simulation optimization effect, this paper further simulates the natural frequency, damping ratio, stiffness ratio, mass ratio, speed and road surface grade of distributed drive electric vehicle. The results show that the optimization of the stiffness and damping of distributed-drive electric vehicles effectively improves ride comfort and passenger comfort. The 15 DOF model of distributed electric vehicle provides a theoretical basis for analyzing the ride comfort of distributed electric vehicle.

Stochastic simulation for determining the design flood of cascade reservoir systems

2012 ◽  
Vol 43 (1-2) ◽  
pp. 54-63 ◽  
Author(s):  
Baohong Lu ◽  
Huanghe Gu ◽  
Ziyin Xie ◽  
Jiufu Liu ◽  
Lejun Ma ◽  
...  
Keyword(s):  
Simulation Model ◽  
Stochastic Simulation ◽  
Southern China ◽  
Flow Simulation ◽  
Simulation Method ◽  
Simulation Approach ◽  
Design Flood ◽  
Design Values ◽  
Stochastic Simulation Model ◽  
The Impact

Stochastic simulation is widely applied for estimating the design flood of various hydrosystems. The design flood at a reservoir site should consider the impact of upstream reservoirs, along with any development of hydropower. This paper investigates and applies a stochastic simulation approach for determining the design flood of a complex cascade of reservoirs in the Longtan watershed, southern China. The magnitude of the design flood when the impact of the upstream reservoirs is considered is less than that without considering them. In particular, the stochastic simulation model takes into account both systematic and historical flood records. As the reliability of the frequency analysis increases with more representative samples, it is desirable to incorporate historical flood records, if available, into the stochastic simulation model. This study shows that the design values from the stochastic simulation method with historical flood records are higher than those without historical flood records. The paper demonstrates the advantages of adopting a stochastic flow simulation approach to address design-flood-related issues for a complex cascade reservoir system.

scholarly journals Study on Friction in Automotive Shock Absorbers Part 1: Friction Simulation Using a Dynamic Friction Model in the Contact Zone of an FEM Model

Vehicles ◽  
2021 ◽  
Vol 3 (2) ◽  
pp. 212-232
Author(s):  
Ludwig Herzog ◽  
Klaus Augsburg
Keyword(s):  
Ride Comfort ◽  
Viscous Friction ◽  
Simulation Method ◽  
Friction Model ◽  
Model Parameters ◽  
Dynamic Friction ◽  
Friction Modeling ◽  
Shock Absorbers ◽  
Operation Conditions ◽  
Wide Range

The important change in the transition from partial to high automation is that a vehicle can drive autonomously, without active human involvement. This fact increases the current requirements regarding ride comfort and dictates new challenges for automotive shock absorbers. There exist two common types of automotive shock absorber with two friction types: The intended viscous friction dissipates the chassis vibrations, while the unwanted solid body friction is generated by the rubbing of the damper’s seals and guides during actuation. The latter so-called static friction impairs ride comfort and demands appropriate friction modeling for the control of adaptive or active suspension systems. In this article, a simulation approach is introduced to model damper friction based on the most friction-relevant parameters. Since damper friction is highly dependent on geometry, which can vary widely, three-dimensional (3D) structural FEM is used to determine the deformations of the damper parts resulting from mounting and varying operation conditions. In the respective contact zones, a dynamic friction model is applied and parameterized based on the single friction point measurements. Subsequent to the parameterization of the overall friction model with geometry data, operation conditions, material properties and friction model parameters, single friction point simulations are performed, analyzed and validated against single friction point measurements. It is shown that this simulation method allows for friction prediction with high accuracy. Consequently, its application enables a wide range of parameters relevant to damper friction to be investigated with significantly increased development efficiency.

A Research of Shaft Modal Simulation Method Based on the Preloaded Angular Contact Ball Bearing

2013 ◽  
Vol 389 ◽  
pp. 364-370
Author(s):  
Bei Li ◽  
Jian Bin Zhang ◽  
Lu Sha Jiang
Keyword(s):  
Simulation Analysis ◽  
Simulation Method ◽  
Numerical Control ◽  
Angular Contact Ball Bearing ◽  
Tightening Force ◽  
Shaft System ◽  
Element Simulation ◽  
Rolling Element ◽  
Bearing Stiffness ◽  
Main Spindle

In order to analysis modal characteristic of bearing with pre-tightening force on main spindle of numerical control lathe, this paper proposes a model of spindle modality analysis. This model is used to simulate the preloaded bearing shaft system modal, and the simulation results are verified by modal experiment. This paper takes 7005c as the research object to establish the equivalent-spring model based on the Hertz theory considering the pre-tightening force, whose focus is dealing with the contact between bearings rolling element and raceway. Then the model will be used to get the bearing stiffness for finite element simulation analysis. The shafting modal with preloaded bearing test platform is structured to get the shaft system modal parameters, which is compared with and verified the simulation analysis.

A Method to Define the Best Weld Sequence Using a Limited Number of Welding Simulation Analysis

2015 ◽  
Author(s):  
Mahyar Asadi ◽  
Ghazi Alsoruji
Keyword(s):  
Simulation Model ◽  
Surrogate Model ◽  
Simulation Analysis ◽  
Combinatorial Problem ◽  
Fem Analysis ◽  
Simulation Models ◽  
Computational Time ◽  
Optimal Sequence ◽  
Welded Structure ◽  
Welding Sequence

Weld sequence optimization, which is determining the best (and worst) welding sequence for welding work pieces, is a very common problem in welding design. The solution for such a combinatorial problem is limited by available resources. Although there are fast simulation models that support sequencing design, still it takes long because of many possible combinations, e.g. millions in a welded structure involving 10 passes. It is not feasible to choose the optimal sequence by evaluating all possible combinations, therefore this paper employs surrogate modeling that partially explores the design space and constructs an approximation model from some combinations of solutions of the expensive simulation model to mimic the behavior of the simulation model as closely as possible but at a much lower computational time and cost. This surrogate model, then, could be used to approximate the behavior of the other combinations and to find the best (and worst) sequence in terms of distortion. The technique is developed and tested on a simple panel structure with 4 weld passes, but essentially can be generalized to many weld passes. A comparison between the results of the surrogate model and the full transient FEM analysis all possible combinations shows the accuracy of the algorithm/model.

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