修正案
发表于 2025-3-25 05:26:01
ng diverse taxonomic assemblages. Despite the limitations of techniques then available, the general accuracy, attention to detail, and superb illustrations that characterized those reports have made them classics in the field, and they are still widely cited as sole or primary anatomical source mate
现存
发表于 2025-3-25 09:41:47
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chuckle
发表于 2025-3-25 15:03:24
Dynamic Problems of Reciprocating Machines, elements. In many cases it is already a difficult task to avoid strong vibrations, which are uncomfortable for users and dangerous to structural safety. Often it is necessary to resort to extensive experimentation even to reach this limited goal.
subordinate
发表于 2025-3-25 19:31:52
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Cerebrovascular
发表于 2025-3-25 21:15:27
Discrete Linear Systems,ass suspended by a linear spring and, possibly, a viscous damper (Figure 1–1a). Historically, however, the mathematical pendulum (Figure 1–1c) represented for centuries the most common paradigm of an oscillator, which could be assumed to be linear, at least within adequate limitations.
Tractable
发表于 2025-3-26 02:55:53
Continuous Linear Systems,ribe their configuration. The differential equations of motion can be easily substituted by a set of linear algebraic equations: The natural mathematical tool for the study of linear discrete systems is matrix algebra.
bronchodilator
发表于 2025-3-26 08:03:04
Dynamic Behaviour of Rotating Machinery,pect to an inertial frame of reference, apart from the vibratory motion that is the object of the study. Many machine elements, however, do not comply with this definition since, owing to their rotational motion, it is not possible to define an inertial system of reference in which the element is st
Mundane
发表于 2025-3-26 09:29:17
Dynamic Problems of Reciprocating Machines,icult and designers very often cannot ensure working conditions that are as smooth as those that can be reached with machines containing only rotating elements. In many cases it is already a difficult task to avoid strong vibrations, which are uncomfortable for users and dangerous to structural safe
Kinetic
发表于 2025-3-26 14:39:15
Short Outline on Controlled and Active Systems,new and often more effective way. While the traditional approach for reducing dynamic stressing has always been that of changing (usually increasing) the stiffness of the structure or adding damping, now control systems that are able either to adapt the behaviour of the structure to the changing dyn
maudtin
发表于 2025-3-26 17:06:46
Textbook 19952nd editionced. In the chapter on the finite element method, a short summary on finite elements in time (four-dimensional finite elements) has been introduced. In the chapter on rotordynamics, two new graphical representations are used; namely, the roots locus plot for free whirling and a tri-dimensional plot