Команда в автокаде massprop
Обновлено: 04.07.2024
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Подскажите пожалуйста как определить момент инерции, например ниже указного сечения в AutoCAD.
Да и еще вопрос: как из двух разных замкнутых контуров создать одно твёрдое тело.
Например трубу с асимметричной толщенной стенки. Или такую форму трубы как в ниже указного файла.
| --- Обращение ко мне - на "ты". Все, что сказано - личное мнение. |
набираете ее в командной строке (простите, кнопочками не пользуюсь в акаде) и получает новое окошко с характеристиками сечения. предупреждаю, что чертить надо было в масштабе 1 у.е.= 1 см, иначе можете получить характеристики не в см4, а мм4, или м4 - кому как повезет %-)))) есть чудная команда в акаде - massprop
набираете ее в командной строке (простите, кнопочками не пользуюсь в акаде) и получает новое окошко с характеристиками сечения. предупреждаю, что чертить надо было в масштабе 1 у.е.= 1 см, иначе можете получить характеристики не в см4, а мм4, или м4 - кому как повезет %-)))) Только добавить требуется. Сечение должно представлять из себя объект типа "область" (region)
От того, как сечение расположено относительно начала координат Мировой Системы, будут зависеть полученные характеристики.
Команда работает также с твердыми телами. Да команда наверное хорошая. И я тоже когда-то с клавы писал. Но уже почти 2 года мучаюсь с русским Автокадом. Может кто-то знает как и этот вопрос решить.
Спасибо.
Вычисление масс-инерционных характеристик областей и тел
Командная строка: масс-хар
Выберите объекты: Выбрать объекты любым способом
При выборе нескольких областей принимаются только области, компланарные первой из выбранных.
Масс-инерционные характеристики объекта выводятся в текстовом окне AutoCAD; затем следует запрос об их записи в текстовый файл.
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By:
Calculates and displays the mass properties of selected regions or 3D solids.
Regions
The following table shows the mass properties that are displayed for all regions.
Mass properties for all regions
The surface area of 3D solids or the enclosed area of regions.
The total length of the inside and outside loops of a region. The perimeter of a 3D solid is not calculated.
The two coordinates that define the bounding box. For regions that are coplanar with the XY plane of the current user coordinate system, the bounding box is defined by the diagonally opposite corners of a rectangle that encloses the region. For regions that are not coplanar with the XY plane of the current UCS, the bounding box is defined by the diagonally opposite corners of a 3D box that encloses the region.
A 2D or 3D coordinate that is the center of area for regions. For regions that are coplanar with the XY plane of the current UCS, this coordinate is a 2D point. For regions that are not coplanar with the XY plane of the current UCS, this coordinate is a 3D point.
If the regions are coplanar with the XY plane of the current UCS, the additional properties shown in the following table are displayed.
Additional mass properties for coplanar regions
Moments of inertia
A value used when computing the distributed loads, such as fluid pressure on a plate, or when calculating the forces inside a bending or twisting beam. The formula for determining area moments of inertia is
area_moments_of_inertia = area_of_interest * radius 2
The area moments of inertia has units of distance to the fourth power.
Products of inertia
Property used to determine the forces causing the motion of an object. It is always calculated with respect to two orthogonal planes. The formula for product of inertia for the YZ plane and XZ plane is
product_of_inertia YZ,XZ = mass * centroid_to_YZ * dist centroid_to_XZ
This XY value is expressed in mass units times the length squared.
Radii of gyration
Another way of indicating the moments of inertia of a 3D solid. The formula for the radii of gyration is
gyration_radii = (moments_of_ inertia/body_mass) 1/2
Radii of gyration are expressed in distance units.
Principal moments and X,Y,Z directions about centroid
Calculations that are derived from the products of inertia and that have the same unit values. The moment of inertia is highest through a certain axis at the centroid of an object. The moment of inertia is lowest through the second axis that is normal to the first axis and that also passes through the centroid. A third value included in the results is somewhere between the high and low values.
3D Solids
The following table shows the mass properties that are displayed for 3D solids.
Mass properties for solids
The measure of inertia of a body. The density is always a value of 1.00, so the mass and volume have the same value.
The amount of 3D space that a solid encloses.
The diagonally opposite corners of a 3D box that encloses the solid.
A 3D point that is the center of mass for solids. A solid of uniform density is assumed.
Moments of inertia
The mass moments of inertia, which is used when computing the force required to rotate an object about a given axis, such as a wheel rotating about an axle. The formula for mass moments of inertia is
mass_moments_of_inertia = object_mass * radius axis 2
Mass moments of inertia unit is mass (grams or slugs) times the distance squared.
Products of inertia
Property used to determine the forces causing the motion of an object. It is always calculated with respect to two orthogonal planes. The formula for product of inertia for the YZ plane and XZ plane is
product_of_inertia YZ,XZ = mass * dist centroid_to_YZ * dist centroid_to_XZ
This XY value is expressed in mass units times the length squared.
Radii of gyration
Another way of indicating the moments of inertia of a solid. The formula for the radii of gyration is
gyration_radii = (moments_of_inertia/body_mass) 1/2
Radii of gyration are expressed in distance units.
Principal moments and X,Y,Z directions about centroid
Calculations that are derived from the products of inertia and that have the same unit values. The moment of inertia is highest through a certain axis at the centroid of an object. The moment of inertia is lowest through the second axis that is normal to the first axis and that also passes through the centroid. A third value included in the results is somewhere between the high and low values.
The following prompts are displayed.
Use an object selection method to select either regions or 3D solids for analysis. If you select multiple regions, only those that are coplanar with the first selected region are accepted.
Write analysis to a file
Specify whether you want to save the mass properties to a text file. By default, the text file uses a .mpr file extension.
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