Methods for calibration of vibration and shock pick - ups . resonance frequency testing of undamped accelerometers on a steel block 振动与冲击传感器的校准方法安装在钢块上的无阻尼加速度计共振频率测试
The traditional no - damp equation of a engine - mount system was modified with consideration of gyro effect 摘要应用陀螺力学理论，对传统动力总成悬置系统的无阻尼动力学方程进行修正，引入陀螺矩阵，得到新的动力学方程。
Express the differences of displacement variation of a mass subjected by a free damped vibration and a forced vibration , separately 请分别陈述当一个质量块在受到无阻尼震动及强迫震动时两种震动情况时其位移的变动的差异
It is widely accepted that the frequencies of external forces are neither equal nor near to any eigenvalue of a linear system without damping , so as to prevent it from resonance 摘要对于无阻尼线性系统，外力频率不等于或不接近于系统的任一固有频率一直被认为是避免共振的条件。
Choosing of parameter for damped reducer is then presented , and its nature is compared . the best effective reducer is chosen based on actual condition . at last , one suffered harmonic load steel beam is applied by high damping spring tmd to reduce vibration , and experiment results indicate that tmd with high damping spring performs better 接着提出了阻尼吸振器新的参数选择方法，对无阻尼吸振器和阻尼吸振器的性能进行了比较，根据具体情况，选择吸振效果最佳的吸振器类型。
Detailed numerical studies are presented for the transitional dynamics of the steady - state motions of those systems with the variation of the excitation and the system parameters , with the illustrations given for rich nonlinear phenomena , such as the bifurcations of periodic vibro - impact motions and the chaotic vibro - impact motions . in chapter 5 , the existence of the periodic vibro - impacts , as well as the corresponding stability is analyzed for an oblique - impact vibrating system composed of a spring - pendulum and an oscillator . when the system damping and the tangential friction 结果表明，在无阻尼、无摩擦的简化情况下，周期斜碰撞振动运动具有严格的存在条件，并随激励参数的变化出现复杂的分叉和稳定性的反复切换；运动阻尼可在较大参数范围内对非稳定运斜碰撞振动系统动力学研究( 5 ) ( 6 )动镇定;相对而言，切向摩擦对系统稳态特征的影响不大。
The paper expounds on the following aspects . firstly , on the basis of analysis of current techniques for measuring plant water potential and with the dynamic characteristics of vapor diffusion in consideration , the relationship between the transient process of humidity at the position of the sensor and the water potential of the plant sample is studied in depth , and the corresponding testing apparatus for the on - line non - invasive automatic monitoring of plant water potential is designed 在仔细分析现有植物水势测量技术原理及优缺点和所开发的植物水势测量仪的基础上，考虑植物水分扩散的动态特性，研究样品水分无阻尼自然扩散，其上方空气的暂态过程与水势的关系，设计了研究植物水势在线无创伤自动监测技术的试验装置。
