Modeling and analysis for dynamic behavior of elevator traction system under the braking of safety gear

2021 ◽  
Vol 263 (3) ◽  
pp. 3738-3747
Author(s):  
Xiaolong Ma ◽  
Peng Zhang ◽  
Ni Li ◽  
XI Shi ◽  
Huaiwu Zou
Keyword(s):  
Dynamic Behavior ◽  
Working Conditions ◽  
Length Change ◽  
Emergency Case ◽  
Modeling And Analysis ◽  
Braking Performance ◽  
Braking Force ◽  
Traction System ◽  
Mass Spring ◽  
Two Sides

In the emergency case when the elevator car is over speeding in the downward direction, the traction car will be stopped rapidly by the braking of safety gear. However, the counterweight and the traction sheave are still moving, which maybe induces the collision between the counterweight and the traction sheave, the slip and off-track between the traction sheave and the rope. Therefore, a two sides mass-spring-damping rope model was proposed in this paper to investigate the dynamic behavior of elevator traction system under the braking of safety gear. In this model, the interaction between the car and the counterweight on both sides of the traction sheave was introduced. Meanwhile, the slip behavior and various constraints between the rope and traction sheave were respected in this model. Especially, the rope slack and the rope length change were considered to approach the mechanical properties of real rope. Furthermore, a numerical scheme based on Newmark- method was applied to solve the proposed dynamic model. Then the impacts of the braking force on the dynamic behavior of elevator traction system under different working conditions were deeply studied. Results showed the braking force of the safety gear, the speed and the acceleration of the traction sheave had great influences on the bounce of the counterweight. In fact, the braking performance, the vibrations of the car, rope and counterweight could be well analyzed based on this model, which is key for the realization of the steady and safe braking of traction elevator.

Simulation and Analysis of Two-Mass Suspension Modification Using MATLAB Programming

2019 ◽  
Vol 3 (1) ◽  
pp. 160-165
Author(s):  
Hendry D. Chahyadi
Keyword(s):  
Vibrational Energy ◽  
State Space Model ◽  
Mass System ◽  
Modeling And Analysis ◽  
The Road ◽  
Final Project ◽  
Quarter Car ◽  
Automotive Suspension ◽  
Mass Spring ◽  
Matlab Programming

The designs of automotive suspension system are aiming to avoid vibration generated by road condition interference to the driver. This final project is about a quarter car modeling with simulation modeling and analysis of Two-Mass modeling. Both existing and new modeling are being compared with additional spring in the sprung mass system. MATLAB program is developed to analyze using a state space model. The program developed here can be used for analyzing models of cars and vehicles with 2DOF. The quarter car modelling is basically a mass spring damping system with the car serving as the mass, the suspension coil as the spring, and the shock absorber as the damper. The existing modeling is well-known model for simulating vehicle suspension performance. The spring performs the role of supporting the static weight of the vehicle while the damper helps in dissipating the vibrational energy and limiting the input from the road that is transmitted to the vehicle. The performance of modified modelling by adding extra spring in the sprung mass system provides more comfort to the driver. Later on this project there will be comparison graphic which the output is resulting on the higher level of damping system efficiency that leads to the riding quality.

scholarly journals Car braking effectiveness after adaptation for drivers with motor dysfunctions

2021 ◽  
Vol 11 (1) ◽  
pp. 617-623
Author(s):  
Adam Sowiński ◽  
Tomasz Szczepański ◽  
Grzegorz Koralewski
Keyword(s):  
Efficiency Index ◽  
Mathematical Function ◽  
Test Results ◽  
Braking Performance ◽  
Braking System ◽  
System Adaptation ◽  
Parametric Description ◽  
Limited Power ◽  
Braking Force ◽  
Selection Of

Abstract This article presents the results of measurements of the braking efficiency of vehicles adapted to be operated by drivers with motor dysfunctions. In such cars, the braking system is extended with an adaptive device that allows braking with the upper limb. This device applies pressure to the original brake in the car. The braking force and thus its efficiency depend on the mechanical ratio in the adapting device. In addition, braking performance depends on the sensitivity of the car’s original braking system and the maximum force that a disabled person can exert on the handbrake lever. Such a person may have limited power in the upper limbs. The force exerted by the driver can also be influenced by the position of the driver’s seat in relation to the handbrake lever. This article describes the research aimed at understanding the influence of the above-mentioned factors on the car braking performance. As a part of the analysis of the test results, a mathematical function was proposed that allows a parametric description of the braking efficiency index on the basis of data on the braking system, adaptation device, driver’s motor limitations, and the position of the driver’s seat. The information presented in this article can be used for the preliminary selection of adaptive devices to the needs of a given driver with a disability and to the vehicle construction.

Design of combined brake system for light weight scooters

2021 ◽  
pp. 095440702110240
Author(s):  
Yuan-Ting Lin ◽  
Chyuan-Yow Tseng ◽  
Jao-Hwa Kuang ◽  
Yeong-Maw Hwang
Keyword(s):  
Ride Comfort ◽  
Brake System ◽  
Force Distribution ◽  
Test Results ◽  
Systematic Method ◽  
Braking Performance ◽  
Evaluation Indexes ◽  
Low Costs ◽  
Braking Force ◽  
Good Agreement

The combined brake system (CBS) is a mechanism that links the front and rear brakes for scooters. For two-wheeled scooters, a CBS with appropriate braking force distribution can reduce the risk of crashing accidents due to insufficient driving proficiency. The design of the braking force distribution for a CBS is challenging to the designer because it has to fulfill many requirements such as braking performance, ride comfort, reliability, and low costs. This paper proposes a systematic method to optimize the parameters of CBS. The evaluation indexes for the design are first discussed. The steps to determine the critical parameter to meet the indexes and a method to predict braking performance are developed. Finally, driving tests are carried out to verify the effectiveness of the proposed method. Experimental results showed that the deceleration of the tested scooter equipped with the designed CBS achieves an average mean fully developed deceleration (MFDD) of 5.246 m/s2, higher than the homologation requirement. Furthermore, the proposed method’s prediction of braking performance is in good agreement with the test results, with errors <1%.

Dynamic Modeling and Analysis of Tank Vehicle under Braking Situation

2013 ◽  
Vol 694-697 ◽  
pp. 176-180
Author(s):  
Ying Wan ◽  
Li Mai ◽  
Zhi Gen Nie
Keyword(s):  
Steady State ◽  
Dynamic Modeling ◽  
Transient State ◽  
Equivalent Model ◽  
Vehicle Model ◽  
Matlab Simulink ◽  
Modeling And Analysis ◽  
Braking Performance ◽  
Pitch Motion ◽  
Vehicle System

Considering the instability of the direction dynamics of tank vehicle system under braking maneuver, the longitudinal equivalent model of liquid was formulated with consideration of both the steady-state and the transient state dynamics of the liquid. The Matlab/simulink program of the liquid was built and was combined with the vehicle model in Trucksim software to simulate and analyze the motion of the liquid cargo centroid and its dynamical effects on the vehicle under braking maneuver. It is observed that the liquid cargo slosh motion in tank vehicles has significant influences on braking performance, pitch motion and perpendicular motion of the vehicle. The results of this paper have significant help for studies on dynamics of vehicle tankers under braking maneuver and ensurement of braking stability and security.

The Effect of Spring Mass on Nonlinear System Dynamic Behavior

2012 ◽  
Vol 197 ◽  
pp. 120-123
Author(s):  
Qing Chao Yang ◽  
Jing Jun Lou ◽  
Hai Ping Wu ◽  
Si Mi Tang
Keyword(s):  
Nonlinear System ◽  
Nonlinear Systems ◽  
Dynamic Behavior ◽  
Phase Plane ◽  
Dead Zone ◽  
Great Influence ◽  
System Dynamic ◽  
Motion Trajectories ◽  
Mass Spring ◽  
The Impact

A model is established in this paper about the impact of mass spring on the particle in nonlinear systems with dead-zone and the particle’s subsequent synchronised movement with spring. Simulates are conducted under different conditions, and it is found that when the spring mass is large, the phase plane of particle’s motion trajectories change significantly to the condition when spring is no mass. It is concluded that the spring mass have a great influence on the dynamic behavior of nonlinear systems with dead-zone.

Experimental Investigation of Vacuum Brake System Performance in Light Commercial Vehicles

2015 ◽  
Vol 7 (1) ◽  
Author(s):  
R. Anbalagan ◽  
J. Jancirani
Keyword(s):  
Experimental Investigation ◽  
System Performance ◽  
Performance Testing ◽  
Brake System ◽  
Commercial Vehicles ◽  
Braking Performance ◽  
Stopping Distance ◽  
Braking Force

This paper presents experimental investigation of braking performance of vacuum brake system for light commercial vehicles. The vacuum brake system uses a compressor for creating vacuum and requires less driver effort compared to the conventional brake system. In this work various components of vacuum brake system are designed and fabricated and then installed in Maruti Omni vehicle for performance testing. The stopping distance, braking force and braking efficiency are analysed for vacuum brake system.

A Study on Forming Mechanism of Braking Torque on the Friction Surface

2013 ◽  
Vol 850-851 ◽  
pp. 200-203
Author(s):  
Zhu Yu Su
Keyword(s):  
Modeling And Simulation ◽  
Friction Surface ◽  
Frictional Coefficient ◽  
Frictional Material ◽  
Braking Performance ◽  
Forming Mechanism ◽  
Braking Torque ◽  
Huge Impact ◽  
Braking Force ◽  
The Stability

The process of vehicle brake, the influence of the temperature on brake friction directly determines the braking force and the frictional coefficient, and has a huge impact on the braking torque. Based on the characteristics of frictional material, combining with modeling and simulation tests, researching the basic theory of braking technology, contribute to the stability and enhancement of braking performance.

Key Factors Effect on Vehicle Braking Performance Based on Nonlinear 3DOF Vehicle Dynamic Model

2010 ◽  
Vol 439-440 ◽  
pp. 950-955 ◽  
Author(s):  
Li Jun Zhang ◽  
Rui Wang
Keyword(s):  
Distribution Coefficient ◽  
Dynamic Model ◽  
Rear Axle ◽  
Force Distribution ◽  
Key Factors ◽  
Braking Performance ◽  
Vehicle Mass ◽  
Moment Distribution ◽  
Braking Torque ◽  
Braking Force

3DOF nonlinear braking dynamic model considering tire-road adhesion characteristics was established, and non-dimensional equations were gained from the above mathematic models by using braking torque coefficient, front and rear axle equivalent inertia coefficients and braking force distribution coefficient. Based on the numerical calculation in Matlab-Simulink software, the effect of key factors, (including vehicle mass and vehicle gravity center position variation, frontal and rear braking force distribution coefficient, and frontal and rear axle inertial variation caused by driven mode) on vehicle braking performance, such as braking distance and wheel lockup status, was investigated and summarized. Several 3D visualizations of the simulation results show that variation of vehicle center of gravity, vehicle mass, braking moment distribution, wheel equivalent inertia due to driveline, can cause quite complex effect. It can be assumed that the gained results in this study can help to improve vehicle braking performance and enhance braking stability.

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