Tutorials to .com

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 simulation technology

Print View , by: iSee ,Total views: 119 ,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, transmission chain, 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 movement animation 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 computer hardware configuration proposed by the high demands, in the general three-dimensional CAD software to simulate the chain of transmission is difficult. This article will explore the Pro / ENGINEER Wildfire version environment kinematic chain drive design and simulation, the final recommendation of the two professional chain drive dynamics simulation software environment, users want to be helpful to chain drive.

II, Pro / ENGINEER design and chain drive kinematics of three-dimensional simulation

First of all, the design chain drive transmission power requirements to be determined in accordance with the size of the sprocket teeth, chain and chain trajectories of the type and specifications, determined by calculating the number of chain, chain drive mechanism for the simulation of a sound foundation. The following is a chain drive of the build process simulation.

1. Step one

Chain drive design trajectory to determine the chain length and the number of interfaces. Figure 1 and Figure 2 shows, the use of Sketch drawing curve track, the center line of the level of the two sprocket. The design of the chain drive chain a total of 20 (There is no drawing the size of sprocket).

Pro / E chain drive virtual assembly design and motion simulation technology

Picture not clear? Click here to view the image (larger).

Figure 1 chain drive curves

Pro / E chain drive virtual assembly design and motion simulation technology

Picture not clear? Click here to view the image (larger).

Figure 2 chain model

2. Step 2

Design chain components. Can be designed according to the actual circumstances constitute a chain of inner / outer chain plate, pin and sleeve, and then assembled into sub-components segment. In order to reduce the transmission chain simulation time and computing the amount of data, where only one segment of the representative parts of all components (Figure 3).

3. Step Three

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.

Pro / E chain drive virtual assembly design and motion simulation technology

Picture not clear? Click here to view the image (larger).

Figure 3 to simplify the model chain

Pro / E chain drive virtual assembly design and motion simulation technology

Figure 4 The first chain assembly

Pro / E chain drive virtual assembly design and motion simulation technology

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.

Pro / E chain drive virtual assembly design and motion simulation technology

Figure 6 Setting the direction of tangential velocity trough

Pro / E chain drive virtual assembly design and motion simulation technology

Figure 7 the definition of initial conditions

Pro / E chain drive virtual assembly design and motion simulation technology

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).

Pro / E chain drive virtual assembly design and motion simulation technology

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

Pro / E chain drive virtual assembly design and motion simulation technology

Picture not clear? Click here to view the image (larger).

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.

Pro / E chain drive virtual assembly design and motion simulation technology

Angular velocity of the definition of Figure 11 Movement

Pro / E chain drive virtual assembly design and motion simulation technology

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.

Pro / E chain drive virtual assembly design and motion simulation technology

Figure 13 Kinematics of the definition of

Pro / E chain drive virtual assembly design and motion simulation technology

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 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, the application 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 and application 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.

Pro / E chain drive virtual assembly design and motion simulation technology

Picture not clear? Click here to view the image (larger).

Figure 15 tracks running through the system 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.

Pro / E chain drive virtual assembly design and motion simulation technology

Picture not clear? Click here to view the image (larger).

Pro / E chain drive virtual assembly design and motion simulation technology

Figure 16 engine timing chain drive dynamics modeling and simulation

Pro / E chain drive virtual assembly design and motion simulation technology

Picture not clear? Click here to view the image (larger).


AutoCAD Tutorial Articles


Can't Find What You're Looking For?


Rating: Not yet rated

Comments

No comments posted.