Multi-objective optimization design of anti-roll torsion bar using improved beluga whale optimization algorithm

Purpose – This study aims to reduce the redundant weight of the anti-roll torsion bar brought by thetraditional empirical design and improving its strength and stiffness.Design/methodology/approach – Based on the finite element approach coupled with the improved belugawhale optimization (IBWO) algorithm, a collaborative optimization method is suggested to optimize the designof the anti-roll torsion bar structure and weight. The dimensions and material properties of the torsion bar weredefined as random variables, and the torsion bar’s mass and strength were investigated using finite elements.Then, chaotic mapping and differential evolution (DE) operators are introduced to improve the beluga whaleoptimization (BWO) algorithm and run case studies.Findings – The findings demonstrate that the IBWO has superior solution set distribution uniformity,convergence speed, solution correctness and stability than the BWO. The IBWO algorithm is used to optimizethe anti-roll torsion bar design. The error between the optimization and finite element simulation results wasless than 1%. The weight of the optimized anti-roll torsion bar was lessened by 4%, the maximum stress wasreduced by 35% and the stiffness was increased by 1.9%.Originality/value – The study provides a methodological reference for the simulation optimization process ofthe lateral anti-roll torsion bar.

Time-Variant Reliability-Based Multi-Objective Fuzzy Design Optimization for Anti-Roll Torsion Bar of EMU

Although various types of anti-roll torsion bars have been developed to inhibit excessive roll angle of the electric multiple unit(EMU)car body,it is critical to ensure the reliability of structural design due to the complexity of the problems involving time and uncertainties.To address this issue,amulti-objective fuzzy design optimization model is constructed considering time-variant stiffness and strength reliability constraints for the anti-roll torsion bar.A hybrid optimization strategy combining the design of experiment(DoE)sampling and non-linear programming by quadratic lagrangian(NLPQL)is presented to deal with the design optimization model.To characterize the effect of time on the structural performance of the torsion bar,the continuous-time model combined with Ito lemma is proposed to establish the time-variant stiffness and strength reliability constraints.Fuzzy mathematics is employed to conduct uncertainty quantification for the design parameters of the torsion bar.A physical programming approach is used to improve the designer’s preference and to make the optimization results more consistent with engineering practices.Moreover,the effectiveness of the proposed method has been validated by comparing with current methods in a practical engineering case.

Optimization of suspension system of heavy off-road vehicle for stability enhancement using integrated anti-roll bar and coiling spring mechanism

Short suspension system has an indispensable effect on vehicle handling and ride,so,optimization of vehicle suspension system is one of the most effective methods,which could considerably enhance the vehicle stability and controllability.Motion control,stability maintenance and ride comfort improvement are fundamental issues in design of suspension system of off-road vehicles.In this work,a dependent suspension system mostly used in off-road vehicles is modeled using Trucksim software.Then,geometric parameters of suspension system are optimized using integrated anti-roll bar and coiling spring in a way that ride comfort,handling and stability of vehicle are improved.The simulation results of suspension system and variations of geometric parameters due to road roughness and different steering angles are presented in Trucksim and effects of optimization of suspension system during various driving maneuvers in both optimized and un-optimized conditions are compared.The simulation results indicate that the type of suspension system and geometric parameters have significant effect on vehicle performance.

Research on the influence of action between fin and anti-rolling tank on the integrated stabilization effect

Through analyzing the roll model of the integrated system of fin and anti-rolling tank, this paper uses binomial equation to simplify the module and check how the approximate parameters simulate the original function. Based on the simplified module, the influence of fin and anti-rolling tank on the coefficient items of the roll module is discussed, and the influencing factors between fin and anti-rolling tank are analysed. And through simulation, the influence of action between fin and anti-rolling tank on the static characteristics, and the integrated stabilization effect, are analyzed.

Simulation Research on an Active Anti-Roll System for an Air Spring Passenger Car

To reduce the roll movement of an air spring passenger car, an active anti-roll system is developed, which is constructed with hydraulic and pneumatic units to change spring rate during cornering. For the comparing research between the passive and active system, a two-track vehicle model and a co-simulation model of air spring system are built. For the simulation research on the linear movement of the actuator, a mathematical model is considered as dynamical subsystem in the co-simulation model. To active control the roll angle of vehicle body, a sliding-mode controller with optimized control parameters for the test vehicle is introduced into the model. The characteristics of sliding-mode controller is discussed and the validation of active antiroll control is proved by comparison with other control methods. The results show that the roll angle of air spring vehicle is reduced obviously with the active anti-roll actuator in comparison with that of the passive system. Compared with other control methods, sliding-mode controller has an advantage of shortest switching times, which leads to a longer lifetime of actuator and valves.

Influence of sway motion on passive anti-rolling tank

The passive anti-rolling tank is one of important ship stabilizers widely used today. But at present, research of the tank is most aimed at its rolling movement. In this paper, the influence of sway motion on the passive anti-rolling tank is considered, the mathematical model of ＂ship-passive antl-rolling tank＂ system coupled with sway motion is developed basing on the U-shaped passive anti-rolling tank theory. Both simulation results and experimental data indicate that it is necessary to consider the influence of sway motion on the anti-rolling tank, which is more agreeable to the actual circumstance.

地铁车辆用新型整体式抗侧滚弯扭杆装置研制

介绍了抗侧滚扭杆装置工作原理。根据某地铁空间小、且车体及转向架高度可调的要求,研发了新型整体式抗侧滚弯扭杆装置,详细阐述了该新型抗侧滚弯扭杆装置的设计方案、力学性能分析等,并进行了相关试验。试验结果表明:该装置的刚度、强度及制造工艺等完全满足地铁运用要求。

轨道车辆抗侧滚扭杆系统3点协调加载试验研究

对抗侧滚扭系统进行三点协调加载试验是安全性能判定中最关键的试验。重点分析了3点协调加载试验方案,研究了不同横向位移对抗侧滚扭杆系统力学性能的影响,同时进行了试验验证,并与2点协调加载方式进行了比对。研究表明相对2点协调加载方式,3点协调加载试验更能准确反映抗侧滚扭杆系统力学性能,该研究成果进一步完善了抗侧滚扭杆系统试验标准,对抗侧滚扭杆系统产品研发和试验起指导作用。

基于主动横向稳定杆的自卸汽车作业稳定性

针对传统自卸汽车普遍存在作业稳定性较差的问题,通过建立具有单侧主动横向稳定杆的空气悬架自卸汽车功能虚拟样机模型,并利用联合仿真技术,分别研究了在不同控制方式下的被动横向稳定杆及单侧主动横向稳定杆对空气悬架自卸汽车作业稳定性的影响。通过对比分析,得出单侧主动横向稳定杆系统显著地提高了空气悬架自卸汽车卸载时的作业稳定性。

空气弹簧对车辆曲线通过性能的影响

建立了考虑左右空气弹簧垂向耦合模型的车辆系统数学模型,由理想气体的状态方程得到空气弹簧的力学方程,分析了车辆通过曲线时车辆与空气弹簧的动态特性。仿真结果表明:由于高度阀的动作,车辆在驶出曲线后各空气弹簧的压力不一致,导致车体不能回到静平衡位置;车辆以正常速度通过曲线时,车辆曲线通过动力学性能变化不大;在车辆多次通过同一种曲线的较恶劣工况时,空气弹簧内气压变化范围是一定的;增加抗侧滚刚度能明显抑制车体侧滚,从而减小空气弹簧内气压的变化量;增大空气弹簧横向跨距,并选择合适的刚度和阻尼,能使车辆驶出曲线后各空气弹簧压力接近静平衡值。

轨道车辆抗侧滚扭杆系统刚度的影响因素

抗侧滚扭杆系统的系统刚度是重要的性能参数,通过分析在车体侧滚时扭杆系统的变形,研究扭杆系统刚度的影响因素、滞弹性等,并提出了计算抗侧滚扭杆系统刚度的有限元分析模型。

基于ABAQUS子模型算法的花键连接抗侧滚扭杆有限元分析

采用ABAQUS软件模拟计算了花键连接抗侧滚扭杆的受力情况。计算结果与试验结果对比表明此方法正确可靠。采用子模型的方法进一步得到花键的局部应力分布,结果表明简化整体模型的接触关系可以降低仿真分析的计算花费,提高分析效率,且子模型方法解决了网格数量太大、计算时间长以及收敛性差的问题。计算结果可为疲劳分析提供有力支持,并为扭杆系统疲劳失效模式提取提供一定帮助。

我国轨道车辆用抗侧滚扭杆装置的发展现状

鉴于抗侧滚扭杆装置可提高车辆抗侧滚扭刚度并增大车辆的乘坐舒适度,文中综合阐述了目前我国抗侧滚扭杆装置的结构特点,描述了该装置的具体功能,同时对其中关键部件扭杆轴的材料选择以及其新型加工工艺进行了说明。

Research on roll stabilization for ships at anchor

With the increasing importance of ocean exploitation,providing anti-rolling stability for ships at anchor has become more and more important.The lift-generation theory of traditional fin stabilizers is based on incoming flow velocity,which is not suitable for explaining lift generated at anchor.We analyzed non-steady flows,with forces on fin stabilizers generated by non-incoming flow velocity conditions,and gave a new lift-generation model.The correctness of the model was proven by comparing experimental results of fin stabilizer motion under non-incoming velocity conditions from the fluid computation software with that from the emulator of the lift-generation model.Finally,the model was used in an anti-rolling system on a ship and the reduction of roll was much better than what could be achieved by passive anti-rolling tanks.

单斜臂悬架轮边电驱动系统的横向稳定杆设计

轮边电驱动系统是电动汽车的一种重要驱动形式。安装横向稳定杆可在不改变垂向刚度的前提下提高车辆侧向刚度,从而在保证行驶平顺性的同时改善行驶稳定性。由于单斜臂悬架轮边电驱动系统的结构和参数与传统悬架形式存在区别,因此需要在现有文献基础上推导公式和建模仿真。以电动汽车整车平台为研究对象,根据车辆实际结构和空间布置的需求,确定稳定杆的结构参数,以此提出不同刚度的横向稳定杆方案。利用Matlab/Simulink对各个方案进行建模仿真,从时域角度和频域角度分析整车系统对方向盘转角的阶跃响应特性。研究方法对于其它形式(如麦弗逊悬架、双横臂悬架等)的轮边电驱动系统横向稳定杆的设计匹配亦具有价值。

Optimization of the roll motion of box-shaped hull section with anti-rolling sloshing tanks and fins in beam waves

With the development of ocean engineering and demand for safety of the ship and offshore structures, the transportation and storage of liquid have become an important issue nowadays. Furthermore, in order to improve the hydrodynamic performances of the ship and offshore structures, the anti-rolling liquid tanks are often taken into consideration. The internal-external coupling flow effect is vital for the ship and liquid tank designs, especially when the external wave frequency is close to the natural frequency of liquid tanks with a certain filling ratio, large amplitude motions may occur, which is dangerous to some extent. In this paper, the simulation-based-design method is introduced at first, and the verification of the numerical calculation of internal-external coupling flow with liquid tanks is done then. Finally, the filling ratio of the anti-rolling liquid tank and the installation angle of the anti-rolling fins are optimized to reduce the roll motion amplitude of the hull section to the greatest extent under the combined action of the two anti-rolling devices. Optimization results show that the roll motion amplitude of box-shaped hull section can be successfully reduced by reasonably designing the two anti-rolling devices, which can be a reference to the future design of the fishing ship and other ships with anti-rolling devices.

低入口城市客车前空气悬架横向稳定杆设计分析

针对低入口城市客车前悬架是否需要加装横向稳定杆的问题,进行计算分析。结论是不需要加装。