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基于平台结构的模态参数识别软件编程技术   总被引:2,自引:0,他引:2  
模态参数识别软件主要功能信号采集、信号处理和参数识别,为了增强可扩展性能,软件采用了平台技术进行设计,接口具有规范性和通用性,平台由面向对象编程方法搭建而成,不仅强调封装概念,更重要的是平台的结构关系和开发标准,软件广泛运用表达式计算,状态机,多线程编程;OpenGL图形开发技术,设计了功能齐全的数据类,以满足参数识别工程应用的要求。  相似文献
2.
飞行颤振数据处理软件多线程编程的有效实现   总被引:1,自引:0,他引:1  
多线程编程提高了飞行颤振数据处理软件的灵活性和易操作性,但也增加了软件编程和维护的复杂程度。针对这一矛盾,本文引进新的设计思想,提出新的多线程编程框图实现方法(Diagram method for multiple thread programming,DM/MTP),从而简化多线程的设计思路,特别适合于大型工程软件的设计。文中详细介绍了DM/MTP在模态参数识别算法NLUP中的应用。  相似文献
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油水混合物含水率在线检测技术最新研究进展   总被引:1,自引:0,他引:1  
综述了基于油水物性机理、多维回归分析、多传感器信息融合、神经网络人工智能、电容层析成像、油水模态辨识等方法的含水率在线检测技术研究进展,剖析了影响原油含水率测量精度的多种因素,指出了原油含水率在线检测技术的发展趋势。  相似文献
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Virus coevolution partheno-genetic algorithms for optimal sensor placement   总被引:1,自引:0,他引:1  
A virus coevolutionary partheno-genetic algorithm (VEPGA), which combined a partheno-genetic algorithm (PGA) with virus evolutionary theory, is proposed to place sensors optimally on a large space structure for the purpose of modal identification. The VEPGA is composed of a host population of candidate solutions and a virus population of substrings of host individuals. The traditional crossover and mutation operators in genetic algorithm are repealed and their functions are implemented by particular partheno-genetic operators which are suitable to combinatorial optimization problems. Three different optimal sensor placement performance index, one aim on the maximization of linear independence, one aim on the maximization of modal energy and the last is a combination of the front two indices, have been investigated. The algorithm is applied to two examples: sensor placement for a portal frame and a concrete arc dam. Results show that the proposed VEPGA outperforms the sequential reduction procedure (SRP) and PGA. The combined performance index makes an excellent compromise between the linear independence aimed index and the modal energy aimed index.  相似文献
5.
针对气动弹性试验的需要,设计了基于虚拟仪器技术的振动测试与分析系统,主要用于频谱分析、模态辨识和颤振预测。系统的设计利用的是LabVIEW虚拟仪器开发平台及Matlab,内容涵盖振动信号的采集与分析处理。在地面振动试验和风洞试验中的应用实例验证了该套系统的有效性。  相似文献
6.
In collaboration with some of the German automotive industry OEMs, an active vibration dummy called MEMOSIK V, was defined in response to their specific requirements for vibration comfort. The topics described in this paper shall deliver an insight into a selection of the development phases of this development project.

An active, three-dimensional vibration dummy is described with the newly developed MEMOSIK V, which simulates the human dynamic behavior by reproducing an equivalent dynamic mass. This vibration dummy qualifies for replacing the occupant as a test object and measuring instrument and allows the objective and repeatable measurement of the vibration transmission from the vehicle base to the buttocks and the back through the vehicle seat.

Based on extensive measurements of the dynamic mass of the sitting man in the fore-and-aft, the lateral and the vertical direction, the objective functions of the vibration dummy are deduced through a modal identification approach. By integrating these parameterized functions in the control system, the dynamic behavior of the dummy can be adapted to the mass percentiles F05, M50 and M95, as well as to individual people by the software managed modification of the controller setup. The variation in posture is guaranteed for the complete design range of passenger car and commercial vehicle seats. The integrated measurement system permits the objective and repeatable rating of the human exposure ISO 2631-1, 1997. Mechanical vibration and shock—evaluation of human exposure to whole-body vibration—general requirements] as well as the evaluation of seat transfer functions considering all three directions in space, both on simulator platforms and in mobile use on the road.

Relevance to the industry

Considering the rating of seating and vibration comfort, the automotive industry has to meet the challenge to establish a relationship between the subjective comfort sensation and the objective and measurable physical quantities. Hence, the demand for a measurement system that makes it possible to acquire, reproduce and comprehend the circumstances that define seating and vibration comfort is great and ascending continuously.  相似文献

7.
针对在使用环境激励进行模态辨识时,模态阻尼比辨识结果散布较大的问题,提出基于滑动拟合阶次与统计方法结合的模态阻尼比辨识方法,作为特征系统实现算法(Eigensystem Realization Algorithm,ERA)的前后处理方法,从而提高模态阻尼比的辨识精度和稳定性.详细介绍ERA环境激励模态辨识理论;给出滑动拟合阶次与统计方法相结合的模态阻尼比辨识方法以及流程.通过算例验证该方法的有效性.  相似文献
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