Currently, many research from domestic and foreign on improving anti-rollover performance of vehicle mainly focus on the electronic control of auxiliary equip- ment, do not make full use of suspension layout to optimi...Currently, many research from domestic and foreign on improving anti-rollover performance of vehicle mainly focus on the electronic control of auxiliary equip- ment, do not make full use of suspension layout to optimize anti-rollover performance of vehicle. This investigation into anti-rollover propensity improvement concentrates on the vehicle parameters greatly influencing on anti-rollover propensity of vehicle. A simulation based on fishhook procedure is used to perform design trials and evaluations aimed at ensuring an optimal balance between vehicle＇s design parameters and various engineering capacities, the anti-rollover propensity is optimized at the detailed design stage of a new SUV model. Firstly a four-DOF theoretical kinematic model is established, then a complete multi-body dynamics model built in ADAMS/car based on the whole vehicle parameters is correlated to the objective handing and stability test results of a mule car. Secondly, in fish- hook test simulations, the Design of Experiments method is used to quantify the effect of the vehicle parameters on the anti-rollover performance. By means of the simulation, the roll center height of front suspension should be more than 30 mm, that of rear suspension less than 150 mm, and the HCG less than 620 mm for the SUV. The ratio of front to rear suspension roll stiffness should be ranged from 1.4 to1.6 for the SUV. As a result, at the detailed design stage of product, the anti-rollover performance of vehicle can be improved by optimizing chassis and integrated vehicle parameters.展开更多
互联数据中心DCs(data centers)的工作负载及可再生能源预测存在很强的随机性,为避免数据中心在日内平衡市场承担较多的罚款,本文提出数据中心两阶段源荷协同优化调度模型。在日前阶段,基于日前预测信息制定次日的最优调度计划并向日前...互联数据中心DCs(data centers)的工作负载及可再生能源预测存在很强的随机性,为避免数据中心在日内平衡市场承担较多的罚款,本文提出数据中心两阶段源荷协同优化调度模型。在日前阶段,基于日前预测信息制定次日的最优调度计划并向日前电力市场投标购电;在日内阶段,采用滚动优化的方法,对日内调度计划进行实时调整。同时,采用并行交替方向乘子算法ADMM(alternating direction method of multipliers)将集中式优化问题转为多个可以交互的子优化问题,对日内滚动优化模型进行求解。仿真结果表明:所提出的优化调度模型可以有效降低多数据中心运行经济成本。展开更多
基金Supported by Guangdong Provincial Technology-Planning Project of China(Grant Nos.2014B010106002,2013B10402006,2015B010137002)
文摘Currently, many research from domestic and foreign on improving anti-rollover performance of vehicle mainly focus on the electronic control of auxiliary equip- ment, do not make full use of suspension layout to optimize anti-rollover performance of vehicle. This investigation into anti-rollover propensity improvement concentrates on the vehicle parameters greatly influencing on anti-rollover propensity of vehicle. A simulation based on fishhook procedure is used to perform design trials and evaluations aimed at ensuring an optimal balance between vehicle＇s design parameters and various engineering capacities, the anti-rollover propensity is optimized at the detailed design stage of a new SUV model. Firstly a four-DOF theoretical kinematic model is established, then a complete multi-body dynamics model built in ADAMS/car based on the whole vehicle parameters is correlated to the objective handing and stability test results of a mule car. Secondly, in fish- hook test simulations, the Design of Experiments method is used to quantify the effect of the vehicle parameters on the anti-rollover performance. By means of the simulation, the roll center height of front suspension should be more than 30 mm, that of rear suspension less than 150 mm, and the HCG less than 620 mm for the SUV. The ratio of front to rear suspension roll stiffness should be ranged from 1.4 to1.6 for the SUV. As a result, at the detailed design stage of product, the anti-rollover performance of vehicle can be improved by optimizing chassis and integrated vehicle parameters.
文摘互联数据中心DCs(data centers)的工作负载及可再生能源预测存在很强的随机性,为避免数据中心在日内平衡市场承担较多的罚款,本文提出数据中心两阶段源荷协同优化调度模型。在日前阶段,基于日前预测信息制定次日的最优调度计划并向日前电力市场投标购电;在日内阶段,采用滚动优化的方法,对日内调度计划进行实时调整。同时,采用并行交替方向乘子算法ADMM(alternating direction method of multipliers)将集中式优化问题转为多个可以交互的子优化问题,对日内滚动优化模型进行求解。仿真结果表明:所提出的优化调度模型可以有效降低多数据中心运行经济成本。
