Analytical Modelling and Design of a Mechatronic Cradle System
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The document presents the design and implementation of an automated oscillating cradle system that swings automatically when a baby cries, utilizing mechatronics technology. This cradle features a microcontroller, sound sensor, and GSM communication to alert parents, aiming to reduce human effort and stress for caregivers. The system is designed to enhance the baby’s sleeping environment while being economical and user-friendly for working parents.
![Analytical Modelling and Design of a Mechatronic Cradle System
(IJSRD/Vol. 3/Issue 10/2015/097)
All rights reserved by www.ijsrd.com 476
T= 48.28 sec
Time per oscillation, t = N/T (2)
N- Number of revolutions
t= 40/48.28
t= 0.828 sec
If, θ is Maximum angle of oscillation
θ= tan-1
(L/g) (3)
θ= tan-1
(500/295)
θ= 66˚06’
The cradle is designed according to the values of
time period, time per oscillation and maximum angle of
oscillation as arrived from the above equations (1),(2) and (3)
respectively.
IV. MECHATRONIC CIRCUIT FEATURES
It Uses the extremely popular SIM300 GSM module and can
be controlled by standard AT commands. It Provides the
industry standard serial RS232 interface for accessible
network to computers and its auxiliary devices. It afford serial
TTL directly interfaced to microcontrollers.It incorporates
Power, RING and Network LEDs for easy debugging. 3V
Lithium Battery holder with applicable circuitry for
maintaining backup that modules the internal RTC. It is
based on GSM based Voice communications, Data/Fax,
SMS,GPRS and TCP/IP stack. Module’s operation mode can
have the control over the PWR Switch connected to the PWR
pin. It comes with an onboard wire antenna for better
reception and optioned for adding an external antenna along
through an SMA connector. The SIM300 allows an alterable
serial baud rate from 1200 to 115200bps (9600 default). It
Modem a low power consumption of 0.25A during normal
operations and around 1A during transmission. Operating
Voltage: 7–15V AC or DC. The mechatronics arrangement
used for arriving the working model of Automated
Oscillating Cradle System has been shown in Fig.3 and Fig.4
Fig. 3: Mechatronics circuit
Fig. 4: Working model of Automated Oscillating Cradle
System
V. CONCLUSIONS
The present work reduces the human effort and particularly
mother’s stresses in working times.The period of oscillation
of the cradle is maintained for over requirement. The cradle
has a uniform controlled oscillation which creates a good
atmosphere for the baby to sleep. The present work is
economical and user friendly and very useful for working
parents and attendants as they get alerts through their mobile
phones and manage their work efficiently
REFERENCES
[1] Anritha Ebenezer; Anupreethi. S; “Automatic
Cradle Movement for Infant Care” Undergraduate
Academic Research Journal (UARJ), Vol. 1, No. 1,
pp. 2278 – 11292012.
[2] Acredolo, L. and Goodwyn, S “ putting Energy into
Vibration, from journal publish in 2000”,Graph
Frequency of vibration of the swing...2000.
[3] Andrews, L. “For Baby Swing Consideration before
Installing Baby Swing, Automatic baby swing”.
2002.
[4] A.L. Schwab, J.P. Meijaard, and P. Meijers, “A
comparison of revolute joint clearance model in the
dynamic analysis of rigid and elastic mechanical
systems,” Mechanism and Machine Theory, vol. 37,
no. 9, pp. 895-913, 2002.
[5] Chau-Kai-Hsieh; Chiung Lin; Taiwan; “Baby Cry
Recognizer” US 5668780, Date of Patent ,1997.
[6] Cabrera J A, Simon A and Prado M (2002),
“Optimal Synthesis of Mechanisms with Genetic
Algorithm”,Mechanism and Machine Theory, ol.
37, No. 10, pp. 1165-1177.
[7] Chiou S-J and Kota S (1999), “Automated
Conceptual Design of Mechanisms”, Mechanism
and Machine Theory, Vol. 34, No. 3, pp. 467-495.
[8] Christiaan Huygen (1665) observed that the cradle
link harmonic oscillator and the system models have
a single degree of freedom.
[9] Christenson, T. R., Schmale, D. T., 1999, “A Batch
Wafer Scale LIGA Assembly and Packaging
Technique Via Diffusion Bonding,” Twelfth IEEE](https://image.slidesharecdn.com/ijsrdv3i100324-160107102758/85/Analytical-Modelling-and-Design-of-a-Mechatronic-Cradle-System-2-320.jpg)
![Analytical Modelling and Design of a Mechatronic Cradle System
(IJSRD/Vol. 3/Issue 10/2015/097)
All rights reserved by www.ijsrd.com 477
International Conference on
Microelectromechanical microphone sensig
Systems, 17 - 21 Jan. 1999, pp. 476 - 481.
[10]E.Ngale Haulin, A.A. Lakis, & Ravine, “Optimal
synthesis of a cardle link mechanism used in hand
prosthesis”, Mechanism and Machine Theory ,
2000, 36, 1203- 1214.
[11]G. Gilardi, and I. Sharf, “Literature survey of
contact dynamics mode-ling,” Mechanism and
Machine Theory, vol. 37, no. 10, pp. 1213-1239,
2002.
[12]Gim Wong, “Automatic baby crib rocker” US
3952343, Date of Patent:,1976.
[13]Jimenez J M, Alvarez G, Cardenal J and Cuadrado J
(1997), “A Simple and General Method for
Kinematic Synthesis of Oscillating Spatial
Mechanism”, Mechanism and Machine Theory,
Vol. 32, No. 3, pp. 323-341.
[14]Mariappan J and Krishnamurty S (1992), “Using
Exact Gradients in Mechanism Design”, ASME
Advances in Design Automation, Vol. 44, No. 2, pp.
53-59](https://image.slidesharecdn.com/ijsrdv3i100324-160107102758/85/Analytical-Modelling-and-Design-of-a-Mechatronic-Cradle-System-3-320.jpg)
Analytical Modelling and Design of a Mechatronic Cradle System
- 1. IJSRD - International Journal for Scientific Research & Development| Vol. 3, Issue 10, 2015 | ISSN (online): 2321-0613 All rights reserved by www.ijsrd.com 475 Analytical Modelling and Design of a Mechatronic Cradle System R. Dinesh1 V. Murugabalaji2 P. N. Sundarajan3 1,2,3 Assistant Professor 1,2,3 Department of Mechanical Engineering 1,2,3 SVS College of Engineering, Coimbatore, India Abstract— Cradle is an appliance which use to carry a baby and oscillate automatically with certain speed for comfort sleep of a baby. Babies sleeps sound in mosses baskets or cradle, as they afford a limited sleeping atmosphere which helps them feel secure. It's important to ensure that swinging cradle are locked when not in use or when baby is unattended, particularly as baby gets older and stronger.Most appropriate time to maneuver baby from a mosses basket or cradle to a cot is between four to six months, or until your baby starts to push up onto their hands and knees and sits unaided. There is a need to develop a advanced automated oscillated baby cradle because the existing cradles are imported and costly. This design and implementation of a new automated oscillating cradle that swings automatically and sends text messages continuously to the linked mobile numbers when baby cries with the assistance of mechatronics system is developed. Key words: Cradle, Angle of oscillation, C-channel, Global System for Mobile communication (GSM) I. INTRODUCTION Cradle is an invention which is used to carry a baby and which moves from side to side proving oscillating motion. It is a frame to keep the bedclothes from contact with the body feeling secure and comfort. The rocking or gliding reaction of a crib should help baby settle. To enhance an undisturbed sleep and amenity, automated oscillating cradle is developed. The microcontroller that has been used for this project is from PIC series. PIC(Peripheral Interface Controller) microcontroller is the first RISC(Reduced Instruction Set Computer) based microcontroller composed in CMOS (Complementary Metal Oxide Semiconductor) which incorporate isolated bus for guidance and allowing the data simultaneously to ingress the program and data memory. Low power consumption is the major benefit of CMOS and RISC combination which results in reduction of chip size to a minute sized pin. The main impact of CMOS is that it has immunity to noise than other fabrication process. II. MATERIAL SELECTION Selection of belt material is based on the power of motor, P. We consider the (A) section V-belt. For that Nominal top width= 13 mm Nominal thickness of belt =8 mm Weight per meter = 0.106 Kgf For the C-Channel link rod, frame and mechanism, the mild steel is chosen due to the following reason. The mild steel compositions shown in the Table1 Material Composition Carbon 0.16-0.18% Silicon 0.40% max Manganese 0.70-0.90% Sulphur 0.040% max Phosporous 0.040% max Table 1: Composition of mild steel The design and implementation of a new automated oscillating cradle focuses to swings automatically when baby cries. DC motor is used to oscillate the cradle. The speed of the cradle can be controlled by the belt system. The C-channel uses to converts the circular motion into linear motion. It has a sound sensor system which detects the baby cry sound and accordingly the cradle swings. This system helps parents and nurses to take care of babies without physical attention. The Fig.1 shows the existing cradle system. It consists of frame, huck, stand and cradle. It is made of different materials like cast iron, steel, alloy and plastic etc. Another type of cradle has the rollers to move if from one place to other. These types of cradle are mostly used in hospitals. It is oscillated by minimizing the human effort to the greater extent. Fig. 1: A Typical Cradle System III. DESIGN ANALYSIS Fig. 2: Design of Automated Oscillating Cradle System The period of motion, T= 2π√(L/g) (1) Angular Length, L= √ (5002 + 2952 ) L= 580 mm T= 2 x π√(580/9.81)
- 2. Analytical Modelling and Design of a Mechatronic Cradle System (IJSRD/Vol. 3/Issue 10/2015/097) All rights reserved by www.ijsrd.com 476 T= 48.28 sec Time per oscillation, t = N/T (2) N- Number of revolutions t= 40/48.28 t= 0.828 sec If, θ is Maximum angle of oscillation θ= tan-1 (L/g) (3) θ= tan-1 (500/295) θ= 66˚06’ The cradle is designed according to the values of time period, time per oscillation and maximum angle of oscillation as arrived from the above equations (1),(2) and (3) respectively. IV. MECHATRONIC CIRCUIT FEATURES It Uses the extremely popular SIM300 GSM module and can be controlled by standard AT commands. It Provides the industry standard serial RS232 interface for accessible network to computers and its auxiliary devices. It afford serial TTL directly interfaced to microcontrollers.It incorporates Power, RING and Network LEDs for easy debugging. 3V Lithium Battery holder with applicable circuitry for maintaining backup that modules the internal RTC. It is based on GSM based Voice communications, Data/Fax, SMS,GPRS and TCP/IP stack. Module’s operation mode can have the control over the PWR Switch connected to the PWR pin. It comes with an onboard wire antenna for better reception and optioned for adding an external antenna along through an SMA connector. The SIM300 allows an alterable serial baud rate from 1200 to 115200bps (9600 default). It Modem a low power consumption of 0.25A during normal operations and around 1A during transmission. Operating Voltage: 7–15V AC or DC. The mechatronics arrangement used for arriving the working model of Automated Oscillating Cradle System has been shown in Fig.3 and Fig.4 Fig. 3: Mechatronics circuit Fig. 4: Working model of Automated Oscillating Cradle System V. CONCLUSIONS The present work reduces the human effort and particularly mother’s stresses in working times.The period of oscillation of the cradle is maintained for over requirement. The cradle has a uniform controlled oscillation which creates a good atmosphere for the baby to sleep. The present work is economical and user friendly and very useful for working parents and attendants as they get alerts through their mobile phones and manage their work efficiently REFERENCES [1] Anritha Ebenezer; Anupreethi. S; “Automatic Cradle Movement for Infant Care” Undergraduate Academic Research Journal (UARJ), Vol. 1, No. 1, pp. 2278 – 11292012. [2] Acredolo, L. and Goodwyn, S “ putting Energy into Vibration, from journal publish in 2000”,Graph Frequency of vibration of the swing...2000. [3] Andrews, L. “For Baby Swing Consideration before Installing Baby Swing, Automatic baby swing”. 2002. [4] A.L. Schwab, J.P. Meijaard, and P. Meijers, “A comparison of revolute joint clearance model in the dynamic analysis of rigid and elastic mechanical systems,” Mechanism and Machine Theory, vol. 37, no. 9, pp. 895-913, 2002. [5] Chau-Kai-Hsieh; Chiung Lin; Taiwan; “Baby Cry Recognizer” US 5668780, Date of Patent ,1997. [6] Cabrera J A, Simon A and Prado M (2002), “Optimal Synthesis of Mechanisms with Genetic Algorithm”,Mechanism and Machine Theory, ol. 37, No. 10, pp. 1165-1177. [7] Chiou S-J and Kota S (1999), “Automated Conceptual Design of Mechanisms”, Mechanism and Machine Theory, Vol. 34, No. 3, pp. 467-495. [8] Christiaan Huygen (1665) observed that the cradle link harmonic oscillator and the system models have a single degree of freedom. [9] Christenson, T. R., Schmale, D. T., 1999, “A Batch Wafer Scale LIGA Assembly and Packaging Technique Via Diffusion Bonding,” Twelfth IEEE
- 3. Analytical Modelling and Design of a Mechatronic Cradle System (IJSRD/Vol. 3/Issue 10/2015/097) All rights reserved by www.ijsrd.com 477 International Conference on Microelectromechanical microphone sensig Systems, 17 - 21 Jan. 1999, pp. 476 - 481. [10]E.Ngale Haulin, A.A. Lakis, & Ravine, “Optimal synthesis of a cardle link mechanism used in hand prosthesis”, Mechanism and Machine Theory , 2000, 36, 1203- 1214. [11]G. Gilardi, and I. Sharf, “Literature survey of contact dynamics mode-ling,” Mechanism and Machine Theory, vol. 37, no. 10, pp. 1213-1239, 2002. [12]Gim Wong, “Automatic baby crib rocker” US 3952343, Date of Patent:,1976. [13]Jimenez J M, Alvarez G, Cardenal J and Cuadrado J (1997), “A Simple and General Method for Kinematic Synthesis of Oscillating Spatial Mechanism”, Mechanism and Machine Theory, Vol. 32, No. 3, pp. 323-341. [14]Mariappan J and Krishnamurty S (1992), “Using Exact Gradients in Mechanism Design”, ASME Advances in Design Automation, Vol. 44, No. 2, pp. 53-59