Experimental Investigations of Motion of Slide of Selected Pistol Types

In the presented paper, kinematic characteristics of movable parts of investigated pistols have been experimentally determined with application of high speed camera and appropriate software TEMA motion. Results of measurements can be useful in validation of various theoretical models and can reveal the influence of some technical solutions on parameters of motion of selected parts. Obtained curves presenting dependence of slide velocity versus time, allowed for rough estimation of average value of interaction force between slide and frame of the investigated construction. The results of study highlights advantage of HK USP pistol design. The achieved results are from reduction of the value of the mentioned interaction force (approximately 50%) due to elongation of the most intensive phase of slide motion damping process.

A Function Generation Synthesis Methodology for All Defect-Free Slider-Crank Solutions for Four Precision Points

The well-established methodology for slider-crank function generation states that five precision points can be achieved without structural error. The resulting designs, however, do not necessarily satisfy all of the kinematic requirements for designing a slider-crank linkage used in common machine applications such as driving the ram of a mechanical press. First, linkage solutions to the five precision point synthesis problem may need to change circuits to reach the precision points. Second, there is no guarantee that the input crank is fully rotatable. This paper presents a modification to the function generation synthesis methodology that reveals a continuum of defect-free, slider-crank solutions for four precision points. Additionally, the methodology allows the specification of velocity or acceleration at the precision points. Although smaller accelerations at a point of zero slide velocity are associated with longer dwell, a point having zero velocity and acceleration is shown not to be possible. Examples are included to illustrate this kinematic synthesis methodology.

The Performance Indexes and the Influence Factor of PCP

Confirms the flow area, the minimum value of the comparative slide velocity of the floating contact point, the maximum integration curvature and the radius variation ratio as the performance indexes of PCP, discussed how the PCP’s structure parameters influence the performance indexes. Discovered that the minimum value of the comparative slide velocity of the floating contact point is proportional to the number of rotor’s threads and the coefficient of isometric radius, but is inversely proportional to the radius variation ratio; From the perspective of increasing the minimum value of the comparative slide velocity of the floating contact point, large number of rotor’s threads, big coefficient of isometric radius and little radius variation ratio is needed. But amplify the number of rotor’s threads, the coefficient of isometric radius and decrease the radius variation ratio will reduce the flow area. And amplify the number of rotor’s threads will make the maximum integration curvature greater; decrease the radius variation ratio will reduce the maximum integration curvature too. These four indexes are in contradiction to each other, structure parameters cannot make all performance indexes are optimal.