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Experimental study of suppressing the unbalanced response vibration of rotor system with a G-type integral squeeze film damper

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High Technology Letters 2021年第1期27卷 1-9页

作者： Yan Wei He Lidong Zhang Yufei Zhang Yipeng jia xingyun Beijing Key Laboratory of Health Monitoring and Self-Recovery for High-End Mechanical Equipment Beijing University of Chemical TechnologyBeijing 100029P.R.China

Conventional squeeze film dampers have numerous challenges including lock up,bistable response and incoordinate *** order to resolve these nonlinear problems,a novel G-type integral squeeze film damper(GISFD)is proposed in this *** experimental test rig is provided to investigate the rotor system with an unbalanced single *** simulation results show that the structural design of GISFD is reasonable,which can ensure its safe and stable *** influence of different support stiffnesses on the first-order speed of the rotor system is *** results show that GISFD can effectively suppress the unbalanced response vibration of the *** a certain range,it is found that the suppression effect of GISFD increases with the increase in the kinematic viscosity of the damping *** the silicone oil with kinematic viscosity coefficients v=30.0 cm^(2)/s is employed,the vibration reduction of GISFD is approximately 71.51%.Furthermore,the experimental results show that with the increase of the unbalance,there is a linear relationship between the unbalance and the corresponding amplitude of the unbalanced *** is concluded that GISFD has excellent linear damping characteristics and reduces the sensitivity of the rotor system to the unbalanced mass.

关键词： G-type integral squeeze film damper(GISFD) unbalanced response vibration suppression rotor system dynamic characteristic

Numerical investigation on damping coefficient of the integral squeeze film damper

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High Technology Letters 2022年第3期28卷 317-327页

作者： LI Geng HE Lidong jia xingyun ZHANG Yipeng WANG jian Engineering Research Center of Chemical Safety Ministry of Education Beijing University of Chemical TechnologyBeijing 100029P.R.China

The elimination of rotor vibration is usually achieved by applying additional damping to the *** film dampers are widely used in various aerospace and turbine *** research is carried out on flow characteristics in the integral squeeze film dampers(ISFDs).The dynamic response to the operation condition is investigated through the computational fluid dynamics(CFD) model of *** to the large pressure loss at the oil inlet,the oil film force only changes slightly with the increase of oil supply pressure,and the damping increases *** vibration amplitude only affects the film force,but has no effect on the *** oil film force and damping show an upward tendency with the decrease of thickness of the end seal clearance.

关键词： integral squeeze film damper(ISFD) numerical method oil film force damping coefficient

Dynamic simulation of GEH-IES with distributed parameter characteristics for hydrogen-blending transportation

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Frontiers in Energy 2024年第4期18卷 506-524页

作者： Dengji ZHOU jiarui HAO Wang XIAO Chen WANG Chongyuan SHUI xingyun jia Siyun YAN Key Laboratory of Power Machinery and Engineering of the Ministry of Education Shanghai Jiao Tong UniversityShanghai 200240China Sichuan Research Institute Shanghai Jiao Tong UniversityChengdu 610042China West Pipeline Company National Petroleum and Natural Gas Pipe Network Group Co.Ltd.Urumqi 830012China Institute of Intelligent Manufacturing Modern Industry Xinjiang UniversityUrumqi 830046China

For the purpose of environment protecting and energy saving,renewable energy has been distributed into the power grid in a considerable ***,the consuming capacity of the power grid for renewable energy is relatively *** an effective way to absorb the excessive renewable energy,the power to gas(P2G)technology is able to convert excessive renewable energy into ***-blending natural gas pipeline is an efficient approach for hydrogen ***,hydrogen-blending natural gas complicates the whole integrated energy system(IES),making it more problematic to cope with the equipment failure,demand response and dynamic ***,dynamic simulation of distribution parameters of gas-electricity-hydrogen(GEH)energy system,especially for hydrogen concentration,still remains a *** dynamics of hydrogen-blending IES is *** tackle the issue,an iterative solving framework of the GEH-IES and a cell segment-based method for hydrogen mixing ratio distribution are proposed in this *** typical numerical cases studying the conditions under which renewables fluctuate and generators fail are conducted on a real-word *** results show that hydrogen blending timely and spatially influences the flow parameters,of which the hydrogen mixing ratio and gas pressure loss along the gas pipeline are negatively correlated and the response to hydrogen mixing ratio is ***,the hydrogen-blending amount and position also have a significant impact on the performance of the compressor.

关键词： gas-electricity IES dynamic simulation hydrogen blending power to gas(P2G) renewable energy

Experimental study on integral axial squeeze film damper to suppress longitudinal vibration of propulsion shafting

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High Technology Letters 2021年第1期27卷 76-85页

作者： Fan Wenqiang He Lidong jia xingyun Yan Wei Zhu Gang Wang jian Engineering Research Center of Chemical Safety Ministry of Education Beijing University of Chemical TechnologyBeijing 100029P.R.China

This paper aims at investigating the effectiveness of squeeze oil film in suppressing the longitudinal vibration of propulsion shaft systems through a novel integral axial squeeze film damper(IASFD).After designing the IASFD,a propulsion shafting test rig for the longitudinal vibration control is *** vibration control experiments of the propulsion shafting are carried out under different magnitude and frequency of the excitation *** results show that both IASFD elastic support and IASFD elastic damping support have excellent vibration attenuation characteristics,and can effectively suppress the longitudinal vibration of the shaft system in a wide frequency ***,IASFD elastic damping support has a more significant vibration reduction effect than the other supports,and increasing the damping of the system has obvious effect on reducing the shafting *** an excitation force of 45 N,the maximum reduction of the vibration amplitude is 89.16%.Also,the vibration generated by the resonance phenomenon is also significantly reduced.

关键词： integral axial squeeze film damper(IASFD) propulsion shafting longitudinal vibration vibration damping

Dynamic simulation of gas turbines via feature similarity-based transfer learning

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Frontiers in Energy 2020年第4期14卷 817-835页

作者： Dengji ZHOU jiarui HAO Dawen HUANG xingyun jia Huisheng ZHANG Key Laboratory of Power Machinery and Engineering(Ministry of Education) Shanghai Jiao Tong UniversityShanghai 200240China

Since gas turbine plays a key role in electricity power generating,the requirements on the safety and reliability of this classical thermal system are becoming gradually *** a large amount of renewable energy being integrated into the power grid,the request of deep peak load regulation for satisfying the varying demand of users and maintaining the stability of the whole power grid leads to more unstable working conditions of gas *** startup,shutdown,and load fluctuation are dominating the operating condition of gas *** simulating and analyzing the dynamic behavior of the engines under such instable working conditions are important in improving their design,operation,and ***,conventional dynamic simulation methods based on the physic differential equations is unable to tackle the uncertainty and noise when faced with variant real-world *** data-driven simulating methods,to some extent,can mitigate the problem,it is impossible to perform simulations with insufficient *** tackle the issue,a novel transfer learning framework is proposed to transfer the knowledge from the physics equation domain to the real-world application domain to compensate for the lack of data.A strong dynamic operating data set with steep slope signals is created based on physics equations and then a feature similarity-based learning model with an encoder and a decoder is built and trained to achieve feature adaptive knowledge *** simulation accuracy is significantly increased by 24.6%and the predicting error reduced by 63.6%compared with the baseline ***,compared with the other classical transfer learning modes,the method proposed has the best simulating performance on field testing data ***,the effect study on the hyper parameters indicates that the method proposed is able to adaptively balance the weight of learning knowledge from the physical theory domain or from the real-world operation domain

关键词： gas turbine dynamic simulation data-driven transfer learning feature similarity

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基于直接速度反馈的管道振动主动控制

振动．测试与诊断 2021年第6期41卷 1148-1154,1239页

作者：陈钊何立东贾兴运杨建江闫伟北京化工大学高端机械装备健康监控与自愈化北京市重点实验室北京100029 北京化工大学化工安全教育部工程研究中心北京100029

管道振动给石化设备的安全运行带来严重的隐患。基于直接速度反馈控制原理,利用主动阻尼装置向振动管道系统施加控制力,实现了对管道振动的主动控制。利用根轨迹法分析了控制系统的稳定性,实验验证了惯性作动器的动态特性对系统稳定性... 详细信息

管道振动给石化设备的安全运行带来严重的隐患。基于直接速度反馈控制原理,利用主动阻尼装置向振动管道系统施加控制力,实现了对管道振动的主动控制。利用根轨迹法分析了控制系统的稳定性,实验验证了惯性作动器的动态特性对系统稳定性的影响,在增益系数过大时观察到了系统失稳的现象。以加速度信号作为评价指标,对不同反馈增益系数下主动阻尼装置对管道振动的控制效果进行了对比,并探究了主动阻尼装置的有效作用频带。结果表明,在反馈增益系数选择合理的情况下,主动阻尼装置对作动器线性工作频带内(20~50 Hz)的管道振动都能有较好的控制效果,最高降幅可达80%。最后对主动阻尼装置的设计和使用提出了参考意见,为振动控制效果的进一步提高提供了思路。

关键词：直接速度反馈主动阻尼装置惯性作动器管道系统振动主动控制

聚丙烯酸酯和水性聚氨酯阻尼涂料的减振性能研究

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铁道科学与工程学报 2023年第8期20卷 3072-3080页

作者：董怀玉何立东陈文武贾兴运北京化工大学机电工程学院北京100029 中国石油化工集团化学品安全与控制国家重点实验室山东青岛266071

若能够有效阻隔振动和噪声的传递或在其传递过程中对其能量进行快速衰减,可显著提高乘客的舒适度。将聚丙烯酸酯和水性聚氨酯涂料作为阻尼层涂覆在薄壁结构上,基于单输入单输出(SISO)模态试验方法和正弦扫频激励试验方法探究阻尼层的涂... 详细信息

若能够有效阻隔振动和噪声的传递或在其传递过程中对其能量进行快速衰减,可显著提高乘客的舒适度。将聚丙烯酸酯和水性聚氨酯涂料作为阻尼层涂覆在薄壁结构上,基于单输入单输出(SISO)模态试验方法和正弦扫频激励试验方法探究阻尼层的涂覆厚度、外界激励力频率和激励力幅值对薄壁结构动力学特性的影响规律。首先,将薄壁结构的模态测试结果与使用有限元法计算得到的结果进行对比,发现两者差值较小,验证了SISO模态试验方法的准确性。随后将SISO模态测试方法应用于测试不同涂覆材料和不同涂膜厚度后复合结构阻尼比的变化情况,揭示涂覆阻尼层后复合结构阻尼比的变化情况。试验结果表明:随着涂覆厚度的增加,复合结构的阻尼比随之增大,但不同频率下阻尼比的增加幅度并不相同。另外,对比相同涂覆厚度的阻尼层,聚丙烯酸酯阻尼涂料提供的阻尼比更加稳定。为进一步验证聚丙烯酸酯阻尼涂料的减振能力,对涂覆厚度为1.5 mm的复合结构进行10~500 Hz频率范围内的扫频激励试验。试验结果表明:聚丙烯酸酯涂料能够有效降低薄壁结构在不同激励力频率、不同激励力幅值下薄壁的动态响应幅值,快速耗散振动的能量,提高薄壁结构的稳定性。研究成果可为聚丙烯酸酯和水性聚氨酯阻尼涂料在薄壁结构振动控制中的应用提供指导。

关键词：薄板结构阻尼层机械性能动力学振动控制

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湿压缩过程中水滴的运动分析

哈尔滨工程大学学报 2017年第2期38卷 222-229页

作者：柴柏青徐国印郑群张海贾兴运田志涛哈尔滨工程大学动力与能源工程学院黑龙江哈尔滨150001 海军驻哈尔滨七0三研究所军事代表室黑龙江哈尔滨150001

湿压缩过程中水滴的喷入对压气机性能具有显著影响。为了研究水滴在压气机内的运动情况,对单级轴流压气机的湿压缩过程进行了数值分析。结果表明,水滴在压气机内主要受气流拖拽力的作用,雷诺数与韦伯数整体较小,发生振荡破碎的可能性较... 详细信息

湿压缩过程中水滴的喷入对压气机性能具有显著影响。为了研究水滴在压气机内的运动情况,对单级轴流压气机的湿压缩过程进行了数值分析。结果表明,水滴在压气机内主要受气流拖拽力的作用,雷诺数与韦伯数整体较小,发生振荡破碎的可能性较大,并且集中于转子叶前缘附近;湿压缩过程中会有水滴撞击叶片,不仅对水滴的运动破碎产生影响,还会造成叶片的附加载荷;较小的水滴颗粒传热传质效果较好,湍流波动强度较弱,对气流造成的粘性损失较小。所以,湿压缩效果需要综合考虑水滴产生的蒸发冷却、阻力损失与撞击作用的影响,选取较小的水滴颗粒和适当的喷雾量。

关键词：水滴运动湿压缩两相流传热传质压气机

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方钢管自密实再生混凝土偏压短柱的力学行为

沈阳建筑大学学报（自然科学版） 2017年第3期33卷 420-428页

作者：向星赟赵人达贾毅王永宝西南交通大学土木工程学院四川成都610031

目的研究方钢管自密实再生混凝土偏压短柱的力学行为,揭示不同参数对其承载力和峰值挠度的影响规律.方法通过方钢管自密实再生混凝土短柱的偏心受压试验,研究方钢管自密实再生混凝土偏压短柱的破坏形态,荷载-挠度关系曲线、承载力和峰... 详细信息

目的研究方钢管自密实再生混凝土偏压短柱的力学行为,揭示不同参数对其承载力和峰值挠度的影响规律.方法通过方钢管自密实再生混凝土短柱的偏心受压试验,研究方钢管自密实再生混凝土偏压短柱的破坏形态,荷载-挠度关系曲线、承载力和峰值挠度.结果方钢管自密实再生混凝土偏压短柱由于发生侧向挠曲而破坏.方钢管自密实再生混凝土偏压短柱的荷载-挠度关系曲线可分为弹性阶段、弹塑性阶段和下降阶段.再生粗骨料替代率对方钢管自密实再生混凝土偏压短柱的承载力的影响不显著,而对其峰值挠度的影响较显著.偏心率和含钢率对方钢管自密实再生混凝土偏压短柱的承载力和峰值挠度有显著影响.结论将自密实再生混凝土应用于方钢管混凝土中是可行的,研究成果可为方钢管自密实再生混凝土短柱的工程应用提供理论依据.

关键词：钢管混凝土自密实再生混凝土偏压短柱力学行为