铲除 发表于 2025-3-21 18:44:44

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EXUDE 发表于 2025-3-22 00:02:17

Piezoelectric shellsby electrodes, and the time-dependent voltage, ϕ.(.), be specified on them. The problem is to construct a two-dimensional theory of piezoceramic shells that enables one to determine their resonant vibrations in a wide range of frequencies.

milligram 发表于 2025-3-22 01:25:50

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鼓掌 发表于 2025-3-22 05:49:06

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acrophobia 发表于 2025-3-22 12:45:09

Elastic shells called an elastic shell, the surface . its middle surface, and . its thickness. A plate is the special case of the shell, whose middle surface is plane. The shell is said to be thin if . is much smaller than the characteristic sizes as well as the radius of curvature of the middle surface

folliculitis 发表于 2025-3-22 14:40:17

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人类学家 发表于 2025-3-22 17:50:58

Preliminariesare denoted . .... In a chosen fixed cartesian co-ordinate system a point . corresponds to a triple (., ., .), with . being its i-th co-ordinate. The translation space of ., is denoted by ν it is a three-dimensional vector space. Elements of ν are called (spatial) vectors and are denoted with boldfa

书法 发表于 2025-3-23 01:01:08

Elastic shells three-dimensional Euclidean space ɛ, bounded by a smooth closed curve ∂. (in the case of closed surfaces ∂. = ∅). The surface is described by a vector equation.=.(.,.),.where . is a smooth vector-value function of two variables ., .. At each point of the middle surface we restore the segment of len

良心 发表于 2025-3-23 01:52:51

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变异 发表于 2025-3-23 07:46:29

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查看完整版本: Titlebook: Vibrations of Shells and Rods; Khanh Chau Le Book 1999 Springer-Verlag Berlin Heidelberg 1999 asymptotic methods.elasticity.knowledge.mate