# Контрольные примеры

## Spring with Clearance

VE 0119

3. мая 2019

A single-mass system with clearance and two springs is initially deflected. Determine the natural oscillations of the system - deflection, velocity and acceleration time course.

## Helicoid

VE 0208

10. февраля 2019

A membrane is stretched by means of isotropic prestress between two radii of two concentric cylinders not lying in a plane parallel to the vertical axis. Find the final minimal shape of the membrane - the so-called helicoid, and determine the surface area of the resulting membrane. The add-on module RF-FORM-FINDING is used for this purpose. Elastic deformations are neglected both in RF-FORM-FINDING and in analytical solution, also self-weight is neglected in this example.

## Catenoid

VE 0207

14. ноября 2018

A cylindrical membrane is stretched by means of isotropic prestress. Find the final minimal shape of the membrane - catenoid. Determine the maximum radial deflection of the membrane. The add-on module RF-FORM-FINDING is used for this purpose. Elastic deformations are neglected both in RF-FORM-FINDING and in analytical solution, also self-weight is neglected in this example.

## Cable Equilibrium Force

VE 0205

8. октября 2018

A cable is loaded by means of the uniform load. This causes the deformed shape in the form of the circular segment. Determine the equilibrium force of the cable to obtain the given sag of the cable. The add-on module RF-FORM-FINDING is used for this purpose. Elastic deformations are neglected both in RF-FORM-FINDING and in analytical solution, also self-weight is neglected in this example.

## Balloon – Prestressed Membrane

VE 0206

8. октября 2018

A spherical balloon membrane is filled with gas with atmospheric pressure and defined volume (these values are used for FE model definition only). Determine the overpressure inside the balloon due to the given isotropic membrane prestress. The add-on module RF-FORM-FINDING is used for this purpose. Elastic deformations are neglected both in RF-FORM-FINDING and in analytical solution, self-weight is also neglected in this example.

## Catenary

VE 0079

10. июля 2018

A very stiff cable is suspended between two supports. Determine the equilibrium shape of the cable, the so-called catenary, consider the gravitational acceleration and neglect the stiffness of the cable. Verify the position of the cable at given test points.

## Cable with Concentrated Forces

VE 0080

4. декабря 2017

A cable in the initial position is loaded by two concentrated forces. The self‑weight is neglected. Determine the normal forces in the cable.

## Mathematical Pendulum

VE 0118

4. декабря 2017

The mathematical pendulum consists of a zero‑weight rope and a mass point at its end. The pendulum is initially deflected. Determine the angle of the rope at given test time.

## Free Vibrations of String

VE 0112

27. октября 2017

A thin string is tensioned by the initial strain and initially deflected. Determine the deflection of the test point at given test times.

## Geometric Non-Linearity of Member with Spring

VE 0044

8. января 2016

Slightly sloped member is loaded with the force and held by spring at one end and supported at the other and. Assuming large deformations and neglecting member's self-weight, determine its maximum upward deflection.

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