Experimental investigation of the dynamics of a slider-crank mechanism with local linear force input

Conventional implementation of slider-crank mechanisms result in high loads transmitted through the mechanical structure, inhibiting the design of compact and oil-free machines. Therefore, this research proposes to step away from the conventional, i.e. rotative, actuation and to investigate local linear actuation on the slider-component directly, while maintaining the kinematic link of the slider-crank configuration. In this work the local linear actuating principle is evaluated experimentally where the goal is to obtain a continuous movement of the slider mechanism where Top Dead Centre & Bottom Dead Centre are reached and to minimise the loads transmitted through the mechanical structure. The non-isochronous transient behaviour of a slider-crank mechanism loaded with a spring-damper element is detailed as well as the optimal working conditions at steady state to achieve a reduced loading of the kinematic structure. By matching the operating frequency and resonance frequency of the system, a reduction of the loads transmitted through the system by 63% of the nominal spring load can be achieved. Further experimental (and multibody mechanical) investigation on the influence of flywheel exposes a clear trade-off between the sensitivity of the system and the transmission of the actuation force through the kinematic link.

Fiber Separation From Wood Pulp Using Slider Crank Mechanism

The Fiber separating machine is used to separate the fibers from their raw material (wood pulp). The machine is based on slider crank mechanism in this an iron disk is mounted to the electrical motor. A slider with a rough tooth is present in its bottom. By using the connecting rod, the disk and slider are connected together. The connecting rod converts the rotary motion into the linear motion. By using the forward and backward motion the fibers are de - fiberized from the raw material (wood pulp). This machine is used for small scale industries where bulk machines are not required. The main application of this wood pulp fiber is the making of napkins.

Calculation of kinematics and dynamics of inline piston engines

The textbook discusses the kinematics and dynamics of inline piston internal combustion engines with axial and deaxial crank mechanism. The necessary material for calculating the forces and moments acting in the engine is given, the balancing of engines, the construction of vector diagrams of pressure on the crankshaft bearings are considered, examples of calculations are given. Meets the requirements of the federal state educational standards of higher education of the latest generation. For students of higher educational institutions studying in the field of training "Energy engineering".

Analysis of the combination of the slider-crank and cam mechanism to drive the automatic bandsaw blade grinder

A slide crank and cam mechanism can be combined and used to drive a bandsaw blade grinder. The movement of these mechanisms must ensure a harmonious combination to avoid the impacts of a collision and dynamic load that appears on the cam and roller surfaces. The technical parameters can be determined by methods of geometry, or 3D simulation, or analytical methods. In order to flexibly design the cam and slide crank mechanism, this study uses the analytic method. By setting up mathematical formulas and applying Mathcad software, it allows to quickly determine and change the initial parameters of the mechanisms, evaluates their changes to the stroke and structural profile. Simultaneously, the graphs of the stroke, velocity, and acceleration of the cam mechanism allow the designer to evaluate and select suitable parameters.

ANALYSIS OF RIGID AND FLEXIBLE DYNAMICS OF A SPACE-SLIDER-CRANK MECHANISM BASED ON FINITE ELEMENT METHOD

The investigation analyzes effects of clearance size in revolute and spherical joints with clearance on rigid-flexible dynamic of a space slider crank mechanism by finite element method. The model of the mechanism was designed by Solidworks and then velocity, acceleration, displacement, stress and contact force were determined by finite element analysis of rigid-transient dynamic in ANSYS. The results simulation indicated that the clearance size in revolute and spherical with clearance has sightly effected on the velocity of the slider, but has significantly effected on acceleration, contact force as journal and ball impact into bearing and socket with high peaks of acceleration and contact force as presented in the graph of acceleration and contact forces. The graph outlined that journal and ball motion with three types: free light, contact and impact motion. Clearance size created deviation for the displacement of the slider from 4.29 mm to 9.87 mm and maximum principal stress increases from 8.4 MPa to 10 MPa when clearance size increases from 0 mm to 0.3 mm.