Chapter 2 Mechatronic Design Approach.pptx

Mechatronic Design Approach

1. Mechatronic Design Approach

2. Functions of Mechatronic system 1) Complementing the mechanical system The use of amplifiers and actuators with electrical auxiliary energy led to the simplification of devices such as watches, electrical typewriters ad cameras. The use of microcomputers led to further simplification such as electronic typewriters, sewing machine, multi axis handling system and automatic gears. Light weight design leads to elastic system thus the system is weakly damped. An electronic damping using position, speed or vibration sensors and electronic feedback can be used with an additional advantage of adjustable damping through control algorithms. Examples are elastic drive chains, elastic robots, fluid power systems, far reaching cranes and space constructions. Mechanical systems are usually non-linear. Addition of a closed loop control results in precise tracking of variables leading to an approximate linear behavior. This eases construction and manufacturing.

3. Higher precision by comparison of programmed reference variable and a measured control variable. This is able to compensate design and manufacturing imprecision or allow of the use of low precision part which is also low in cost. Adaptive friction compensation for motion, position and force control. Model base and adaptive control for wide range of operation 2) Improvement of operating properties

4. 3) Addition of new functions Non measurable quantities can be calculated on the basis of measured signals and influence of feed forward and feedback control. Enables supervision and fault diagnosis. Increase in system intelligence by triggering of redundant components, system reconfiguration and maintenance on request.

5. Mech a tronic System Integr a tion [Ref . ] P r o f . Rolf I s e r m a n n

6. I n tegrated Design Issues C oncurrent engineering is a method of designing and developing engineering products in which different departments simultaneously work on the different stages of engineering product development. If managed well, it helps to increase the efficiency of product development and marketing, considerably reducing the time and contributing to the reduction of the overall development cost while improving the final product quality.

7. I n tegrated Design Issues C o nc u rrent engineering of the mech a troni c s approach relies heavily on t he use of s yst e m model ing a nd simul a tion throughout the design a nd prototyping stages. It is especia l ly important that it be programmed in a vis u a l ly intuitive environ m ent. b l ock diagrams, flow charts, s tate tra n sition diagram s , and bond g rap hs.

8. I n tegrated Design Issues Mechatr o nics is a design philo s ophy: an inte g r a ting approach to enginee ring design. Me chatroni c s makes the combin a tion of a ctuato rs, sensors, control systems, and computers in the design process possible. Starting with ba s ic design and progressing through the man u fa c turing phase, mechatronic design optimizes the par a met e rs at each phase to produ c e a qu a lity p ro d uct in a shor t - cycle time

9. Mechatronic Design Process

10. Important Features fu n c t io n s b ased on model par a me ters and s i g n als. Modeling: B l ock diagrams f o r worki n g w i th understandable mult i - disci p l i na r y mode l s that repre s e n t a physical ph e n o me n o n. Simulation: Nu m er i cal me thods f o r s o l v i n g m o dels co n t a i n i n g di f f e re n tial, di s crete, l i n e a r, a nd n o n l i n ear e q uatio n s. Proj e ct Managem e nt: D a t abase f o r mai n t a i n i n g pro j ect i n f o rmation and su b sy s tem m o dels f o r e v e n tual reus e . De s ign: Nu m er i cal me thods f o r co n strai n ed o p tim i zation of p e rf o rmance

11. Important Features prototypi n g e n v iro n me nt. Analysis: F r e q ue n c y -domain and ti m e -domain too l s R e a l -Time Int e rface: A p l ug- in c a rd is used to replace part of the m odel w i th a c tual hardware b y i n terfaci n g to it w ith ac t ua t ors and s en s o rs. Co d e Gene r ato r : Produces e f f ici e nt hi g h - l e v el source code ( s uch as C / C++) from the b lock diagram. The co n t r ol code w i ll b e com p i l ed and us e d on the em b edded proces s or. Embed d ed Proce s sor Int e rface: C o mmu n ica t ion b etw e en the process and the compute r - aided

12. Simul a tion Methods [Ref . ] P r o f . Rolf I s e r m a n n

13. Rea l -Time Simul a tion [Ref . ] P r o f . Rolf I s e r m a n n

14. Hardw a r e - I n -th e -Lo o p (H I L) The hardwar e- in - th e- loop sim u l a tion (HIL) is cha r acterized by operating real co m ponen t s in connection with rea l- time simu l ated co m ponen t s. Us u a lly, the control system har d ware a nd software is the real system, as used f or series produ c tion. The co n tro l led process ( c on s isting of a c tu a tor s, physical processes, and sensor s ) can ei t her comprise sim u l a ted c o mponents or real co m ponen t s,

15. P C -Based Hardw a r e -i n -th e -Lo o p S imulat i on

16. Concur r ent Enginee r ing Concur r ent e ngine e ring is a d esign approa c h in whi c h the design and manu f acture of a product are merged in a sp ecial way. It is n e cessa r y that the k nowl e dge and n e cessa r y info r mation b e coo r dinated a m ongst dif f erent ex p ert g r ou p s. The chara c teristics of con c urrent en g ineering are Better definition of t he p r oduct without late changes. Design for m a nuf a cturing and a sse m bly underta k en in the ea r ly design stage. Process on how the p r oduct development is well defined. Better cost estimates. Decrease in the bar r iers b e tween design and manufacturing.

17. Concur r ent Enginee r ing [ R e f.] B r adl e y

18. Conclu s ion Mechatro n ics design can l ead to high quality and cost e f fe ctive pro d ucts T r aditio n al se q ue n tial mann e r do not po s sess optimum design cap a bili t ies. Concurrent design res ul t s in the development of intel l igent and f l exible mechatronic system Inc r easing demands on the pro d uctivity of machine tools and their growing t echnological co m p l exi t y call for impro v ed methods in fu ture product deve l opment pro c ess es.

19. Exercise: What is the mechatronic system function? Mechatronic system integration consist of? What means by concurrent engineering? List down all the characteristics of a concurrent engineering. Explain the Hardware In the Loop (HIL) mechanism.