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Tutorials to .com Mechine Autocad Pro / E chain drive virtual assembly design and motion simulation technology

Pro / E chain drive virtual assembly design and motion simulationtechnology

Print View by: iSee Total views: 8 Word Count: 2378 Date: Tue, 18 Aug 2009 Time: 4:06 AM

First, an overview of chain drive

Chain drive short pitch precision roller chain, double roller

chain from the sophisticated, precision sleeve short pitch

chain, plate bending roller transmission chain, transmissionchain, as well as tooth forming chain and other transmission

types. Chain Drive is an outstanding feature of the component

chain of small size, large number of rising from the uniform

chain, roller / sleeve mesh structure can be reduced when the

friction and wear, and can achieve the purpose of easing the

impact.

Chain drive for the kinematic simulation of the effect of the

overall machine inspection, chain design and improvement of

the structure and configuration of the number of links have an

important role in verification, chain drive movementanimation for the chain of transmission of product

demonstrations, projects and exchange essential.

Chain components as a result of the small number of characteristics of the chain of transmission flexibility and

practicality, while the number of components of three-dimensional chain drive makes too much body computer

simulation in general difficult to achieve, to solve a huge amount of data on the three-dimensional software and

Voice Coil Motor & StagesLinear & Rotary Motors and Stages Short Stroke,High Speed/Resolutionwww.equipsolutions.com

Simple Motion ControlInexpensive OEM motion control, 1-3 axis,networkable, intelligent.www.simplestep.com

SMT china ReflowManufacturer of reflow oven,wave soldering&stencilprinterswww.torch.cc

Cleveland Precision Syst.Posit. syst. & linear motion comp. Customizeddesignswww.cleveland.de

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Figure 1 chain drive curves

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P 5 f 33P / E h i d i i t l bl d i d ti i l ti t h l T t i l t


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1,2 In the chain component of the assembly chain. Create a chain of components, assembling the first section of a

chain (Figure 4), the use of a "flat" connectors, 2 "groove" joint. Election slot curve ctrl key when the election by 4.

Assembling the first two links (Figure 5), in the first section of the right side of a chain of two chain assembly the first

section, the use of a cylindrical connector and a slot connector.


Figure 3 to simplify the model chain


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Figure 4 The first chain assembly

Figure 5 second chain assembly

4. Step Four

Dynamics simulation technique using simulated chain drive. Modeling environment from the standard simulation

environment to the body (from the "Applications" "institution"), from the "Insert" "initial conditions", open the

"initial conditions of the definition of" dialog box. Click on the definition of the tangential velocity trough icon, choose

the first slot on the chain connecting symbols (Figure 6), the value of input speed 300mm/sec. From the "analysis"

"institutional analysis", the pop-up "analysis of the definition of" dialog box, choose "dynamic" analysis of the type of

initial conditions for the opening of the initial configuration, the motor and external load tab select Clear All. Click on

the "analysis of the definition of" button at the bottom of the dialog box, the two links can be found along the orbital

motion.


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Figure 6 Setting the direction of tangential velocity trough


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gy g gy

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Figure 7 the definition of initial conditions




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Figure 8 the definition of dynamic analysis

This method is a dynamic simulation of the tangential speed of the initial conditions trough, and the use of dynamic

simulation of the "dynamic" analysis of the type of simulation trajectory kinematics. This is a few links of the

campaign is, if all links are fitted in place, then the chain needs a very high body simulation of the hardware

configuration, and the need for computing time to run longer.

5. Step 5

The use of kinematic simulation of the entire simulation of the transmission chain root. Because the four steps of the

simulation method to solve the mechanical properties need to bring a certain simulation problems. The following are

used to simulate the type of kinematic analysis.

Three step-by-step assembly of other chain: select the first two links, a clockwise direction using the "repeat"

command relationship between the joint assembly of other parts, just repeat the cylindrical joints, if the component is

to remove duplication of overlapping components, from the "Repeat" dialog box select a final re-duplication of device

operation, repeat until the completion of the first segment 20 (Figure 2). End assembly noted that the last segment of

the hole can not be installed after the first of a chain-axis alignment before mounting hole may be the last section to

create a separate chain of spare parts, so that hole-axis alignment as far as possible (subject to assembly errors and

the impact of orbital position, in the course of the campaign can not achieve full alignment axis, as shown in Figure

9). 1,6,11,16 In the first segment to add different colors and 6,11,16 months in the first segment on the new settings

to increase the plane Deputy (Figure 10).




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Figure 9 the last section with the first chain can not be aligned




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Figure 10 to add another three plane Deputy

Respectively with reference to the definition of four vice-plane angular velocity, so that the first segment of 1,6,11,16

on the movement in the circle drive components, respectively, serve as each turned 125 degrees. In addition, the

verification operation, if the angular velocity of 125 degrees / s, the first section of a chain approximately a week

rotation time 4.2s.

Into the institutional environment, the current assembly snapshots. 1,6,11,16 In the light of the first segment of the

Z-axis plane, vice joints (select query) the definition of servo motor (Figure 11 and Figure 12). All motor set up are:

the speed of direction (purple arrow) away from right-hand rule in accordance with the chain of anti-clockwise

rotation. Set the speed of the initial angle, select "Current", the speed value of 125.




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Angular velocity of the definition of Figure 11 Movement



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Figure 12 the speed of custom settings

Analysis of the definition and run the campaign. Select the type of "kinematics", the termination time of 4.2s (Figure

13). In the "motor" tab, the settings take effect each time the motor is the key chain drive simulation. The two

electric motors due to the critical point can not be coincidence (single function), so the first two motor starting time

than the first end of a motor delay 0.01s (Figure 14), for which the time difference in 0.01s the scope of the minimum

time interval, the simulation error is allowed. Click "Run", the normal operation of chain drive.




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Figure 13 Kinematics of the definition of

Figure 14 Motor role of time

Sprocket for rotation of the simulation, the definition of the two servo motors to determine the mass ratio of two

sprocket by sprocket and chain snapshot section to determine the appearance of engagement between the position to

complete the chain sprocket and the effect of the overall transmission .

Simulation program of the above-mentioned chain drive chain in the simplification of components, under the premise




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of a successful, due to chain drive simulation, particularly large amount of data, run simulation may take several

hours or even days, so in the transmission chain simulation run completed , it is necessary to save the results in time

to run (*. pbk file playback agencies) in order to follow-up simulation results for chain drive for more in-depth

research.

Third, theapplication of the effect of chain drive dynamics simulation with examples of professional platform

Chain drive in bicycles, motorbikes and other means of transport on the common roller chain, motor drive mechanism,

such as the silent chain, as well as in construction machinery used to track vehicles and other operating systems are

widely used. The following is a common engine timing chain drive structure crawler construction machinery, as well as

the chain of transmission andapplication of dynamic simulation. For these typical chain drive, with many

professional software platform gives a professional model and simulation algorithm, the following are two typical

software vendors are given the chain drive solutions.

(1) South Korea-based recursive algorithm FunctionBay the MFBD (flexible multi-body dynamics) analysis software -

RecurDyn, its high mobility tracked vehicle tracked the package on the track chain and the forces of vehicles are given

a more realistic Solving the program, as shown in Figure 15.





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Figure 15 tracks running through thesystem of modeling and simulation

(2) AVL List of Austria's advanced simulation software engine - Excite, on the engine timing chain drive is given a

professional simulation analysis strategy, as shown in Figure 16.





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Figure 16 engine timing chain drive dynamics modeling and simulation




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