Abstract
Linkwork, in its early applications, consisted mainly of revoluteconnected members and was widely used for converting the continuous rotation of a water wheel into a reciprocating motion suited to piston pumps. The pistoncylinder combination at the end of the line represents a prismatic pair, of course, but ahead of this there are only the revolute connections generally associated with linkwork. Agricola’s arrangements show wheel and pumppower source and point of workfairly close together. Such compactness did not always prevail; linkworks of magnificent proportions were also part of the past. A linkwork is a means of power transmission as well as being a motion transformer. Before the introduction of rope transmissions and the now universal electric wire, linkwork was employed for longdistance transmission of power. Gigantic linkages, principally for mine pumping operations, connected water wheels at the riverbank to pumps high up on the hillside.
1. Introduction
The theory of synthesis of mechanisms and cars are closely connected with a task of the kinematic analysis. The unity of tasks of the analysis and synthesis is caused by coincidence of the equations defining interdependence of variables and fixed parameters of mechanisms and used in each case in their purposes [2]. Moreover, at the solution of a problem of synthesis it is necessary to use managements of kinematic analysis as restrictions. For example [1], at the solution of a problem of synthesis of directed and transmission gears of high classes it is necessary to use the kinematics equations for definition of a rotation angle $\phi $ of the plane if ${Q}_{2}$ it isn’t set in a case when the considered problem of synthesis of the opened ABCD fourbar chain [3, 4]. Therefore, the vector method of the kinematic analysis is offered in this chapter which will be coordinated well with the method of synthesis of IKС stated in the previous chapter, and also it can independently be used for the solution of tasks on provisions, speeds and accelerations of the synthesizable mechanism [5].
2. Materials and methods
In this subsection the task of the analysis of the transfer and directing fourbar mechanisms of the II class with application of vector calculation is considered. The kinematic scheme of the transmission gear is submitted in Fig. 1. Let lengths of links ${\mathcal{l}}_{0}$, ${\mathcal{l}}_{1}$, ${\mathcal{l}}_{2}$, ${\mathcal{l}}_{3}$, and rotation angle ${\phi}_{1}$ of an entrance link of AB are set. It is necessary to define provisions, speed and accelerations of all links.
We write down a condition of isolation of vector contour:
We enter system of coordinates $Oxyz$ with single arts $\overline{i}$, $\overline{j}$, $\stackrel{}{k}$. The provision of an entrance link of AB is defined in the type:
Fig. 1The kinematic scheme of fourbar mechanism
We rewrite the Eq. (1) of rather unknown vectors ${\stackrel{}{\mathcal{l}}}_{2}$, ${\stackrel{}{\mathcal{l}}}_{3}$ in the type:
The essence of an estimated method of definition of vectors ${\stackrel{}{\mathcal{l}}}_{2}$, ${\stackrel{}{\mathcal{l}}}_{3}$ consists as follows. We spread out required vector ${\stackrel{}{\mathcal{l}}}_{2}$ and ${\stackrel{}{\mathcal{l}}}_{3}$ and on orthogonal vectors $\stackrel{}{L}$$\left(\stackrel{}{k}\times \stackrel{}{L}\right)$:
where ${p}_{2}$, ${q}_{2}$, ${p}_{3}$, ${q}_{3}$ unknown coordinates of vectors ${\stackrel{}{l}}_{2}$ and ${\stackrel{}{l}}_{3}$ in new system of coordinates. We l substitute the Eq. (3) in Eq. (2), we receive:
Further considering, ${q}_{2}={q}_{3}=q$ and ${p}_{2}=p$, ${p}_{3}=p1$ system Eq. (3) we will represent in the form:
where $p$ and $q$ are unknown parameters.
We determine parameters $p$ and $q$ from system Eq. (5). For this purpose, we will square both parts of the first and second equations of system Eq. (5):
from here:
Here the plus and minus in the second equality correspond to different assemblies of the fourbar mechanism $ABCD$.
The provisions of all links of the mechanism $ABCD$ can be defined from scalar products of arts of system of coordinates of $Oxyz$ and the found vectors. Really, for definition of provisions ${\phi}_{2}$ and $\gamma $ equalities are also fair:
where, $\stackrel{}{L}={L}_{x}\cdot \overline{i}+{L}_{y}\cdot \overline{j}$, ${\stackrel{}{L}}_{x}={l}_{0x}{l}_{1}\mathrm{c}\mathrm{o}\mathrm{s}{\phi}_{1}$, ${\stackrel{}{L}}_{y}={l}_{0y}{l}_{1}\mathrm{s}\mathrm{i}\mathrm{n}{\phi}_{1}$ and the decision of Eq. (8) can be written down in the type:
We pass to definition of speed analogs. For this purpose we will differentiate Eq. (2) on ${\phi}_{1}$:
where:
from here:
Multiplying the Eq. (11) scalarly on, ${\stackrel{}{l}}_{3}$ we will receive:
Multiplying scalarly on ${\stackrel{}{l}}_{2}$, we have similarly. We pass to definition of acceleration analogs. For this purpose we differentiate the Eq. (11) on ${\phi}_{1}$:
Multiplying scalarly to ${l}_{2}$ and ${l}_{3}$, we receive analogs of accelerations of links of BC and CD in the type:
where ${\stackrel{}{L}}_{1}=\stackrel{}{k}\times {\stackrel{}{l}}_{1}+\stackrel{}{k}\times {\stackrel{}{l}}_{2}{{\phi}_{2}^{\text{'}}}^{2}\stackrel{}{k}\times {\stackrel{}{l}}_{3}{{\phi}_{3}^{\text{'}}}^{2}$.
Thus, the received formulas allow to define in an explicit form provisions, speed and acceleration of all links of the transmission gear $ABCD$.
The provision of conrod point $M$ of the link $BM$ of the directing fourbar mechanism $ABMCD$ (see Fig. 1) is defined depending on the provision of a link of $BS$ as follows:
The analogs of speed and acceleration are defined by differentiation of the Eq. (15) on ${\phi}_{1}$:
The considered technique can be used for the analysis of the fourbar mechanism with forward couples. It is possible to use the received formulas and directly, having carried out limit transition with lengths of the corresponding links striving for infinity.
On the basis of the formulas removed in this paragraph the kinematic analysis of the synthesized mechanisms of the II class has been made. The second equation of system Eq. (9) has been applied at synthesis of guides and transmission gears for definition of unknown provision of the mobile plane ${Q}_{2}$.
Fig. 2Computed plot of the M point position module
Fig. 3Computed plot of the M point velocity module
Fig. 4Computed plot of the M point acceleration module
Fig. 5Computed plot of the M point tangent acceleration module
3. Results and discussion
A proper dynamic model has been developed within GIM software to provide information on the feasibility of the proposed design solution. Simulation tests have been carried out and results are discussed for validating the proposed design and characterizing its operation.
Fig. 6Computed plot of the M point normal acceleration module
Fig. 7Computed plot of the M point curvature radius module
4. Conclusions
As practice has shown the researcher can make the procedure of drawing of mechanical system for this purpose it is necessary to calculate coordinates of characteristic points and in them to display the corresponding elements. The set of standard procedures for receiving Karina’s animation of mechanisms movement, some of them has been created for this purpose, necessary for the solution of an objective are given above. For engineers and researchers the created program has great practical value by designing directing lever mechanisms i.e. on set at the law movement point within several seconds it is possible to receive the real mechanism with animation.
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