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高温超导磁悬浮与飞轮储能 总被引:1,自引:0,他引:1
旋转飞轮的动能储存可以有多种的用途,飞轮储能装置的效率取决于轴承摩擦损耗的降低,高温超导磁悬浮具有稳定性,有可能用以制造飞轮储能用的无摩擦非接触被动磁性轴承。文章分析了超导磁悬浮的起因和特性,评介了目前高温超导YBaCuO材料的水平,分析了用作飞轮储能的磁性轴承的设计考虑及有待解决的问题,最后介绍了国外的研究动态。 相似文献
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高温超导磁悬浮飞轮储能系统样机 总被引:1,自引:0,他引:1
在日益严峻的能源问题背景下,为展示无源高温超导磁悬浮技术在能量储存领域的应用前景,我们设计制作了一台全高温超导磁悬浮形式的飞轮储能样机.样机主要由高温超导磁悬浮轴承、飞轮转子、永磁电机和电路控制及负载部分组成.上下两个轴向型高温超导磁悬浮轴承用于悬浮和稳定飞轮转轴,直径200mm重量1.4kg的飞轮转子作为储能载体,最高可实现13000r/min的转速.在演示运行中,采用灯泡作为负载,该样机完成了从电能→机械能→电能的相互转换. 相似文献
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在世界各国高重复使用单级入轨运载系统的概念研究中,磁悬浮助推发射技术具有低成本、高性能等优点而成为下一代发射系统可供选择的先进技术,提高动态特性可以有效的保证系统工作的稳定性和可靠性,对于磁浮系统及其磁浮技术的应用研究具有一定的指导意义.本文针对高温超导永磁磁浮机构,建立相应的动态性能测试平台,通过激振和响应回馈信号分析获得系统的刚度和固有频率等动态参数,研究和分析一定振幅、频率条件下悬浮气隙的变化对系统动态性能的影响,并探讨了磁浮系统在动态环境中的自稳定行为和可能的控制策略,为缩比磁悬浮发射试验平台的建立提供可靠的技术依据. 相似文献
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在世界各国高重复使用单级入轨运载系统的概念研究中,磁悬浮助推发射技术具有低成本、高性能等优点而成为下一代发射系统可供选择的先进技术,提高动态特性可以有效的保证系统工作的稳定性和可靠性,对于磁浮系统及其磁浮技术的应用研究具有一定的指导意义.本文针对高温超导永磁磁浮机构,建立相应的动态性能测试平台,通过激振和响应回馈信号分析获得系统的刚度和固有频率等动态参数,研究和分析一定振幅、频率条件下悬浮气隙的变化对系统动态性能的影响,并探讨了磁浮系统在动态环境中的白稳定行为和可能的控制策略,为缩比磁悬浮发射试验平台的建立提供可靠的技术依据. 相似文献
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轴承是支承轴颈和轴上回转零件旋转的关键部件,也是高速电机设备的核心组成部分,高温超导磁悬浮轴承特有的自稳定性,克服了机械轴承磨损发热等问题,也无需主动控制,具有载重比大、抗干扰、无噪音等优点,可实现转子高载重比下的超高速运行,非常适合飞轮储能器应用。本文设计了一款用于2 kWh/100 kW超导飞轮储能器的高速转子。通过飞轮转子与超导轴承的耦合计算,实现了较高的径向刚度,并优化了永磁辅助轴承结构,分析了转子的振动模态,得到了转子的特征频率,可使飞轮能稳定运行在15 000 r/min以上的转速。 相似文献
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More and more attentions are attracted to the analysis and design of nonlinear vibration control/isolation systems for better isolation performance. In this study, an isolation platform with n-layer scissor-like truss structure is investigated to explore novel design of passive/semi-active/active vibration control/isolation systems and to exploit potential nonlinear benefits in vibration suppression. Due to the special scissor-like structure, the dynamic response of the platform has inherent nonlinearities both in equivalent damping and stiffness characteristics (although only linear components are applied), and demonstrates good loading capacity and excellent equilibrium stability. With the mathematical modeling and analysis of the equivalent stiffness and damping of the system, it is shown that: (a) the structural nonlinearity in the system is very helpful in vibration isolation, (b) both equivalent stiffness and damping characteristics are nonlinear and could be designed/adjusted to a desired nonlinearity by tuning structural parameters, and (c) superior vibration isolation performances (e.g., quasi-zero stiffness characteristics etc.) can be achieved with different structural parameters. This scissor-like truss structure can potentially be employed in different engineering practices for much better vibration isolation or control. 相似文献
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《Journal of sound and vibration》2006,289(4-5):726-744
Stewart platform is widely used for vibration isolation and precise pointing. As it is a statically determinate structure, if any strut has fault, a disaster could be unavoidable. In the present paper, an octo-strut passive vibration isolation platform with redundancy is introduced and applied to whole-spacecraft vibration isolation. This platform is modeled with the Newton–Euler method. To avoid such possibility that the spacecraft may interact with the fairing, an approach of stiffness design is proposed to reinforce the rotation stiffness of the platform. With the mathematical model, design parameters of the isolator that will affect the nature frequencies of the isolator-spacecraft system are studied. The transmissibility of the isolator topped with rigid and flexible spacecraft is also studied. Results of analytical and numerical studies show that the octo-strut platform is a reliable and effective approach to improving the dynamic environment of a spacecraft. 相似文献
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Reaction wheel assemblies (RWAs) are momentum exchange devices used in fine pointing control of spacecrafts. Even though the spinning rotor of the reaction wheel is precisely balanced to minimize emitted vibration due to static and dynamic imbalances, precision instrument payloads placed in the neighborhood can always be severely impacted by residual vibration forces emitted by reaction wheel assemblies. The reduction of the vibration level at sensitive payloads can be achieved by placing the RWA on appropriate mountings. A low frequency flexible space platform consisting of folded continuous beams has been designed to serve as a mount for isolating a disturbance source in precision payloads equipped spacecrafts.Analytical and experimental investigations have been carried out to test the usefulness of the low frequency flexible platform as a vibration isolator for RWAs. Measurements and tests have been conducted at varying wheel speeds, to quantify and characterize the amount of isolation obtained from the reaction wheel generated vibration. These tests are further extended to other variants of similar design in order to bring out the best isolation for given disturbance loads. Both time and frequency domain analysis of test data show that the flexible beam platform as a mount for reaction wheels is quite effective and can be used in spacecrafts for passive vibration control. 相似文献
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对微藻细胞壁进行破碎是提高微藻油脂提取率的重要手段,超声振动破碎是一种有效的细胞破碎方法。建立基于声冲流、声辐射力、声空化的传质动力学的经验模型,运用传输矩阵法设计用于微藻细胞破碎的超声振动子,搭建了实验平台,并设置不同超声振动工艺参数对微藻细胞的破碎率进行了实验研究。结果表明:超声振动子,在工具头浸入微藻二分之一总溶液深度、工作时间30 min、功率225 W、纵振频率25 kHz的条件下,超声振动破碎的效果最佳,采用氯仿试剂对破碎液进行油脂提取,效果最好。 相似文献
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以菱形负刚度机构HSLDS(high static low dynamic stiffness)隔振器(简称菱形HSLDS隔振器)为研究目标,采用虚功法建立负刚度机构等效摩擦力模型,并以拉格朗日方法建立包含负刚度机构质量及摩擦力因素的动力学方程;利用谐波平衡法(HBM)求解动力学方程,分析了负刚度机构质量及摩擦力对隔振的影响及其优化措施,并通过实物样机验证了理论模型的合理性。实验结果表明:负刚度机构质量及摩擦力对隔振均产生不利影响,应尽量减小;将负刚度机构连杆较短侧连接于载荷平台端,可以减小负刚度机构质量对较高频段隔振性能的影响;在限定隔振器刚度参数以及铰接副接触参数且同时满足刚度与摩擦力优化条件下,通过增大连杆机构杆长差的方式可以优化低频段隔振性能,并降低负刚度机构摩擦力对高频段隔振的影响。 相似文献
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基于PANDA自主并行计算平台,采用模态叠加法开展了多点基础激励作用下的随机振动响应分析算法设计和并行实现研究,构建了相应的并行求解模块。针对光机装置打靶样机中的六自由度平台结构,基于自主研发的软件模块,分析了该结构的模态特性及结构在地脉动载荷下的微振动响应,并与试验结果及商业软件分析结果进行了比对,在模态频率、振型和位移响应方面,都具有较好的一致性,验证了相关软件模块的正确性和PANDA平台在实际工程结构分析中的可用性。 相似文献
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针对光电载荷对隔振性能的需求,提出一种采用菱形连杆机构作为负刚度组件,具有高静、低动刚度特点的非线性隔振器(简称菱形HSLDS隔振器)。采用静力学分析方法,建立了隔振器数学模型,研究了刚度参数设定以及非线性调节方法;利用谐波平衡法(HBM)求解动力学方程,分析了各参数对隔振性能的影响关系;采用动力学仿真软件ADAMS及实物样机对理论模型与结论进行了验证。测试结果表明:菱形HSLDS隔振器具有较方便的参数调整能力,零位刚度及刚度非线性可通过拉簧参数与连杆参数进行设定、优化,隔振的刚度非线性优化程度受主隔振器阻尼以及零位刚度参数影响。相比于传统线性隔振器,菱形HSLDS具有显著的非线性隔振优势,可较好地满足光电载荷隔振需求。 相似文献
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This study focuses on design and analysis of an intelligent vibration isolation platform for reaction wheel assemblies (RWAs) and momentum wheel assemblies (MWAs). A passive platform consisting of four folded beams is designed and analysed for MWAs. A simple and effective mathematical model is developed for the system consisting of the platform and MWAs, and this model is used to investigate the passive vibration isolation performance. Further development is performed to produce an intelligent platform for RWAs, with piezoelectric sensors and actuators bonded to the vertical beams. The flywheel imbalance and impulse load are assumed to be input disturbances for the investigation of the active vibration isolation performance by the finite element method (FEM). The simulation results show that the passive vibration isolation platform is particularly effective for the suppression of a high frequency range vibration for MWAs, and the intelligent platform using velocity feedback control effectively attenuates the dynamic amplification of amplitude at resonance for RWAs. Thus, it is concluded that the passive platform can be used as a vibration isolation platform for MWAs and that the intelligent one can be used for RWAs. 相似文献