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vibration test
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  vibration test
Free vibration test for some sample beams were also carried out to determine their fundamental frequencies.
      
Method of obtaining a feedback signal for correcting the characteristics of an electrodynamic vibration test bed
      
The adhesive performance of aluminized polyester films has been assessed by use of an ultrasonic vibration test.
      
The use of the vibration test may provide a substitute for or augment the routine use of radiography for in vivo evaluation and monitoring of bone healing.
      
The findings revealed that the results of bone photodensity and the mechanical three-point test are highly and positively correlated with the results of the vibration test.
      
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This paper synthesizes and analyses the foreign specifications of environmental vibration test, with comparison emphaticall made of different specefications of random vibration test. Finally, it gives views on the trend of development in the foreign specifications of environmental vibration test.

本文对国外环境振动试验标准进行了综合和分析。特别是对随机振动试验各种标准进行了比较。文中最后对国外环境振动试验标准的发展趋势提出了一些看法。

This solar array substrate is aluminium honeycomb with carbon fiber face sheets. It was completd that the test consists of the model test and the vibration test. The theoretic analysis is performed using a finite element mathematical model. The results of the tests are in agreement with those of the theoretic analysis.The authors have solved the technique for the measurment of parameters of mechanical properties of the various composite material structural members and obtained the necessary datum....

This solar array substrate is aluminium honeycomb with carbon fiber face sheets. It was completd that the test consists of the model test and the vibration test. The theoretic analysis is performed using a finite element mathematical model. The results of the tests are in agreement with those of the theoretic analysis.The authors have solved the technique for the measurment of parameters of mechanical properties of the various composite material structural members and obtained the necessary datum.

文章简要地叙述碳纤维复合材料刚性太阳电池阵基板的结构设计,理论分析,模态试验和振动试验。理论分析和试验结果比较一致。通过试验还解决了基板各种复合材料的力学性能测试问题,取得了必要的数据。

A frequency domain Muilti-Input/Multi-Output (MIMO) Modal Identification method is presented in this paper. Its accuracy, reliability and capability of handling closely-spaced or repeated modes are proved by computer simulation and real structure testing. The application in aircraft Ground Vibration Test (GVT) of a modern fighter is given. The results show that compared to traditional multipoint sine dwell GVT technique, the test operation is easier, the period is shorter and the accuracy is...

A frequency domain Muilti-Input/Multi-Output (MIMO) Modal Identification method is presented in this paper. Its accuracy, reliability and capability of handling closely-spaced or repeated modes are proved by computer simulation and real structure testing. The application in aircraft Ground Vibration Test (GVT) of a modern fighter is given. The results show that compared to traditional multipoint sine dwell GVT technique, the test operation is easier, the period is shorter and the accuracy is higher, compared to the time domain MIMO identification methods developed in 1980's, the order of the tested system (e. i. the number of modes) can be determined directly. Therefore, the computation is reduced, and the necessity of distinguishing structural and"noise"modes is avoided.

本文介绍了一种多输入/多输出频域模态识别方法,并由计算机仿真和实际对称结构实例检验了本方法的精度、可靠性以及处理密集和重根模态的能力。文中给出了在某型现代歼击机全机地面振动试验中的应用,结果表明:和传统多点正弦激振相位共振技术相比,试验操作简单(无需调力),试验周期短,识别精度高;和80年代发展的多输入/多输出时域方法相比,能直接识别系统的阶(模态数),从而减少计算工作量,避免区分真实结构模态和“噪声模态”。

 
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