美国Cambridge Collaborative 公司的声学和振动分析软件-SEAM

SEAM 的应用：

   Cambridge Collaborative 的 SEAM 软件是一种特别适用于研究复杂结构再中高频率范围的动态响应的分析方法。SEAM 不仅可用于象预测船舶的噪音发射和航空器的声学和振动环境等场合也可用于预测汽车，飞机和施工车辆的室内噪音和振动。其他应用场合还包括机械的噪音，工业噪音和建筑音响效果等。

   Cambridge Collaborative's SEAM software provides a method of analysis that is particularly well-suited for studying the dynamic response of complex structures at mid and high frequencies. SEAM is used to predict interior noise and vibration in automobiles, aircraft, and construction equipment cabs as well as the radiated noise from ships and the vibroacoustic environments for spacecraft. Other applications include machinery noise, industrial noise, and building acoustics.

SEAM 的特殊的分析方法：

   SEAM 包含了一个完整的统计能量分析系统(SEA). 被分析的一个复杂的动态系统被分成一系列子结构和声学单元，各个子结构和声学单元的模型被集合进SEA的各子系统中。 不同子系统之间的能量流与子系统的模态能量和耦合因子成比例。SEAM 程序计算所有需要的耦合因子并对每个子系统进行能量平衡。对结果方程求解得到各子系统的模态能量和响应。
SEAM 开发于1980年，最初是用于研究潜水艇的结构传递噪音，1983年开始商业化。从那以后变成了汽车制造和供应商，造船厂，海军研究所和飞机制造厂的认可的分析手段。Cambridge Collaborative 通过软件的开发和研究不断地改进了静态能量分析的性能。
   SEAM includes a complete implementation of statistical energy analysis (SEA). The complex dynamic system being analyzed is divided into a set of substructures and acoustic elements. The modes of each substructure and acoustic element are grouped into SEA subsystems. The flow of energy between the different subsystems is proportional to the modal energies of the subsystems and the coupling factors. The SEAM program calculates all required coupling factors and performs a power balance for each subsystem. The resulting equations are solved for the modal energy and response of each subsystem.

SEAM software was developed in 1980 to study structure-borne noise in submarines, and was made commercially available in 1983. Since that time SEAM has become an accepted analysis procedure by automobile manufacturers and suppliers, major shipyards, Navy research establishments, and aerospace companies. Cambridge Collaborative continues to advance the state of the art in statistical energy analysis (SEA) through software development and research.

SEAM 的技术特性：

   SEAM 软件包中包含了完整的采用了振动和声学能量流技术的统计能量分析系统(SEA) 下面列出了SEAM的许多标准功能. 其他功能可按需要提供.

   The SEAM software package provides a complete implementation of statistical energy analysis using vibrational and acoustic energy flow techniques. The following list describes many of the standard features that come with SEAM. Other features are available on request. Please feel free to contact Cambridge Collaborative for more information on any of these features.

- Ability to develop very large models with thousands of SEA subsystems

- Bending and inplane subsystems for all structural elements

- Calculation of coupling loss factors and modal densities

- Transverse shear deformation corrections for bending of all structural elements

- Frequency dependent damping and material properties

- Octave, one-third-octave, narrowband and percentage bandwidth analysis

- Fast sparse matrix solution routines

- Prediction of input power and response mean and variance

- Acoustic duct, layer, and space elements with one, two and three-dimensional modal densities

- Design sensitivity analysis

- Transient analysis

- Interface to structural optimization programs

- Automatic calculation of properties for beam, plate and shell elements from cross-section dimensions and materials

- Readable ASCII input and output files

- Choice of several different metric and English units, including mixed units

- Automatic generation of SEA subsystems from structural and acoustic elements

- Automatic generation of SEA junctions for each degree of freedom from structural and acoustic point, line and area connections

- Parameter studies using symbolic constants and algebraic equations for input parameters

- On-line context sensitive help

- Quick-look plotting for subsystem SEA parameters: modal energy, energy flow, response, transfer functions, acoustic noise reduction, vibration reduction, and sound transmission loss

- Acoustic damping using loss factors, absorption coefficients, or reverberation times

- Algebraic expressions for input parameters

SEAM 是世界上唯一的统计能量分析的商用软件. 设计响应预测与SEAM的变量预测相结合可以设定上级信赖区间（Predictions of the mean-response can be combined with SEAM predictions of the variance to set upper confidence intervals）。把上级信赖区间（upper confidence interval）用于产品设计将保证新产品达到声学和振动的设计目标。
　

SEAM is the only commercially-available software that provides a complete statistical representation of the SEA response. Predictions of the mean-response can be combined with SEAM predictions of the variance to set upper confidence intervals. Use of the upper confidence interval for product design insures that new products will meet acoustic and vibration design objectives.

SEAM 的使用平台：

SEAM 和 下面提到的visiSEAM 适用于Unix和PC兼容机 Sun, Silicon Graphics, 和 Hewlett Packard 工作站 等等.

SEAM and visiSEAM are available for both Unix and PC-compatible computers. Sun, Silicon Graphics, and Hewlett Packard workstations are supported.