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31.
静压气体球轴承支承球形转子的干扰力矩分析 总被引:4,自引:0,他引:4
中心小孔供气单向受载球面气体轴承可以用于球形转子的静平衡测量。对作用于转子上的干扰力矩进行估算是平衡装置设计的重要部分。本在一定假设条件下推导了由粘性剪切应力和气膜支撑力引起的作用于转子上的干扰力矩。干扰力矩以轴承包角、中心气室张角、气膜压力、转子转速、转子旋转轴位置、失中度、转子非球表示。以干扰力矩最小为准则分析了这些参数的影响,结论有助于静平衡装置的优化设计以及对精度的进一步分析。 相似文献
32.
P. P. Krasnyuk 《International Applied Mechanics》2005,41(12):1357-1367
A mathematical formulation is given and a solution is found to the quasistatic contact problem of thermoelasticity for a rigid
heat-conducting punch moving over an elastic layer with fixed base. The interaction is accompanied by heating due to frictional
forces obeying Amonton’s law. The problem is reduced to a system of integral equations with time-varying limits of integration.
The structure of these equations depends on the type of thermal and physical conditions on the contact surface. An algorithm
is proposed for the numerical solution of this kind of equations. The variation in the contact pressure and contact area with
time is studied
__________
Translated from Prikladnaya Mekhanika, Vol. 41, No. 12, pp. 35–46, December 2005. 相似文献
33.
In this paper, we consider a vibrating system of Timoshenko-type in a bounded one-dimensional domain under Dirichlet–Dirichlet or Dirichlet–Neumann boundary conditions with one or two discrete time delays and one or two internal frictional dampings. First, we show that the system is well posed in the sens of semigroup theory. Second, we prove the exponential stability regardless to the speeds of wave propagation of the system if the weights of the time delays are smaller than the ones of the corresponding dampings, respectively. However, when the weight of one time delay is not smaller than the one of the corresponding damping, we prove the exponential stability in case of equal-speed wave propagation, and the polynomial stability in the opposite case. 相似文献
34.
Paweł SZAFRANIEC 《数学物理学报(B辑英文版)》2017,37(4):1048-1060
In this paper we prove the existence and uniqueness of a weak solution for a dynamic electo-viscoelastic problem that describes a contact between a body and a foundation. We assume the body is made from thermoviscoelastic material and consider nonmonotone boundary conditions for the contact. We use recent results from the theory of hemivariational inequalities and the fixed point theory. 相似文献
35.
36.
基于势能互补原理,不引入额外松弛变量,对库仑摩擦定律未做预先线性化近似,提出了三维弹性摩擦接触问题的非线性互补-接触柔度法,收敛性和收敛速率得到了严格理论保证。数值实验结果表明方法可靠、有效、低存储量、高精度 相似文献
37.
Friction plays a key role in the efficiency and stability of the slip-controlled torque converter clutches. The effects of
friction on the dynamics and stability of a slip-controlled torque converter clutch system using a bifurcation-analysis-based
approach is presented in this paper. A three degree-of-freedom nonlinear driveline model with integral feedback action to
control the clutch slip speed has been utilized for this study. The clutch interface friction is dependent on the slip speed
and is a function of the static friction constant, μ
0, the low velocity friction constant μ
1, and the low velocity exponential rate, γ. Using one-parameter numerical continuation, local Hopf bifurcations of the subcritical type are observed as the friction
parameters μ
1 and γ were varied at low slip speeds. The continuation results are verified using simulations of the full nonlinear model. Stick-slip
and undesirable oscillations of the model inertia elements are observed for certain parameter values. As the slip speed is
increased, the bifurcation instability occurs at an increasingly higher value of μ
1 signifying an improved tolerance of negative friction gradient at higher slip speeds. Smaller exponential rates γ are tolerated at higher slip speeds before the bifurcation instability occurs. For the range of parameter values considered,
no bifurcations occur for a slip speeds higher than 3.4 and 4.5 rad/s with μ
1 and γ as the continuation parameters, respectively. These values of slip speeds are much lower than the system’s first mode of
torsional vibration of 16 Hz (≈100 rad/s). 相似文献
38.
有限变形粘弹性接触的数学规划方法 总被引:2,自引:0,他引:2
研究有限变形粘弹性物体间的接触问题,同时考虑了刚体位移和摩擦等因素,导得该问题数学规划解法的标准形式,极易利用现有算法求解。 相似文献
39.
The possible states of a system of interacting solids with rolling friction and unilateral sliding friction bonds are analyzed. The system can be used for seismic isolation of buildings. The structures (modes) of motion are established. The basic analytical relations are derived, which are needed to construct a dynamic model of variable structure 相似文献
40.
本文主要通过汽车稳定杆在疲劳试验中应力、刚度拟动态试验,采用电测法^[1],在分析杆件中实际应变和位移的基础上进行逆解分析,从而确定稳定杆的实际刚度,支座摩阻反力矩和应力集中系数,为建立稳定杆的简化力学分析及其疲劳寿命预测提供试验依据. 相似文献