The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Tomoaki Mashimo - One of the best experts on this subject based on the ideXlab platform.
-
Self-Sensing and Feedback Control for a Twin Coil Spring-Based Flexible Ultrasonic Motor
IEEE Robotics and Automation Letters, 2020Co-Authors: Yunosuke Sato, Ayato Kanada, Tomoaki MashimoAbstract:We propose a twin Coil Spring-based soft actuator that can move forward and backward with extensibility and can bend left and right with flexibility. It is driven by two flexible ultrasonic motors, each consisting of a compact metallic stator and an elastic elongated Coil Spring. The position of the end effector is determined by the positional relationship of the two Coils and can be kinetically controlled with a constant curvature model. In our design, the Coil Springs act not only as a flexible slider but also as a resistive positional sensor. Changes in the resistance between the stator and the Coil Spring end are converted to a voltage and used for position detection. Each flexible ultrasonic motor with the self-sensing is experimentally evaluated, and it has shown good response characteristics, high sensor linearity, and robustness, without losing flexibility and controllability. We build a twin Coil Spring-based flexible ultrasonic motor prototype and demonstrate feedback control of planar motion based on the constant curvature model.
-
Design and Experiments of Flexible Ultrasonic Motor Using a Coil Spring Slider
IEEE ASME Transactions on Mechatronics, 2020Co-Authors: Ayato Kanada, Tomoaki MashimoAbstract:This article proposes a flexible ultrasonic motor that consists of a single metal cube stator with a hole and an elastic elongated Coil Spring inserted into the hole. When voltages are applied to piezoelectric plates on the stator, the Coil Spring moves back and forward as a linear slider. The use of the Coil Spring brings flexibility for the motor and enables a long stroke to access to deeper sites. Furthermore, the Coil Spring provides an appropriate prepressure between the stator and the Coil Spring to enhance the motor output. We formulate the relation between the Coil Spring parameters and the prepressure to clarify the design methodology of the flexible ultrasonic motor. We model the linear motion of the Coil Spring by an equation of motion and compare it with the transient response by experiments. The flexible ultrasonic motor prototype achieved a translation at a speed of 120 mm/s and demonstrated a force of 0.45 N, and a stable motion even when the Coil Spring is being bent.
-
IROS - Flexible ultrasonic motor using an output Coil Spring slider
2017 IEEE RSJ International Conference on Intelligent Robots and Systems (IROS), 2017Co-Authors: Ayato Kanada, Tomoaki Mashimo, Kazuhiko TerashimaAbstract:We present a flexible ultrasonic motor that generates linear motion as a novel soft actuator. This motor is comprised of a single cube stator with a through-hole, and a flexible Coil Spring inserted into the hole. The Coil Spring, which has a diameter of 10 mm and length of 200 mm, is translated by a vibration generated in the stator. A preload between the stator and the Coil Spring is important for improving the motor performance. The Coil Spring inserted into the stator hole generates the preload by expanding in a radial direction. We build a prototype flexible ultrasonic motor, and examine its basic performance parameters such as thrust force, velocity, response time, resolution and flexibility. To demonstrate flexibility, we show the stable thrust force and velocity even when the Coil Spring is bent to a bending radius of 15 mm.
Ayato Kanada - One of the best experts on this subject based on the ideXlab platform.
-
Self-Sensing and Feedback Control for a Twin Coil Spring-Based Flexible Ultrasonic Motor
IEEE Robotics and Automation Letters, 2020Co-Authors: Yunosuke Sato, Ayato Kanada, Tomoaki MashimoAbstract:We propose a twin Coil Spring-based soft actuator that can move forward and backward with extensibility and can bend left and right with flexibility. It is driven by two flexible ultrasonic motors, each consisting of a compact metallic stator and an elastic elongated Coil Spring. The position of the end effector is determined by the positional relationship of the two Coils and can be kinetically controlled with a constant curvature model. In our design, the Coil Springs act not only as a flexible slider but also as a resistive positional sensor. Changes in the resistance between the stator and the Coil Spring end are converted to a voltage and used for position detection. Each flexible ultrasonic motor with the self-sensing is experimentally evaluated, and it has shown good response characteristics, high sensor linearity, and robustness, without losing flexibility and controllability. We build a twin Coil Spring-based flexible ultrasonic motor prototype and demonstrate feedback control of planar motion based on the constant curvature model.
-
Design and Experiments of Flexible Ultrasonic Motor Using a Coil Spring Slider
IEEE ASME Transactions on Mechatronics, 2020Co-Authors: Ayato Kanada, Tomoaki MashimoAbstract:This article proposes a flexible ultrasonic motor that consists of a single metal cube stator with a hole and an elastic elongated Coil Spring inserted into the hole. When voltages are applied to piezoelectric plates on the stator, the Coil Spring moves back and forward as a linear slider. The use of the Coil Spring brings flexibility for the motor and enables a long stroke to access to deeper sites. Furthermore, the Coil Spring provides an appropriate prepressure between the stator and the Coil Spring to enhance the motor output. We formulate the relation between the Coil Spring parameters and the prepressure to clarify the design methodology of the flexible ultrasonic motor. We model the linear motion of the Coil Spring by an equation of motion and compare it with the transient response by experiments. The flexible ultrasonic motor prototype achieved a translation at a speed of 120 mm/s and demonstrated a force of 0.45 N, and a stable motion even when the Coil Spring is being bent.
-
IROS - Flexible ultrasonic motor using an output Coil Spring slider
2017 IEEE RSJ International Conference on Intelligent Robots and Systems (IROS), 2017Co-Authors: Ayato Kanada, Tomoaki Mashimo, Kazuhiko TerashimaAbstract:We present a flexible ultrasonic motor that generates linear motion as a novel soft actuator. This motor is comprised of a single cube stator with a through-hole, and a flexible Coil Spring inserted into the hole. The Coil Spring, which has a diameter of 10 mm and length of 200 mm, is translated by a vibration generated in the stator. A preload between the stator and the Coil Spring is important for improving the motor performance. The Coil Spring inserted into the stator hole generates the preload by expanding in a radial direction. We build a prototype flexible ultrasonic motor, and examine its basic performance parameters such as thrust force, velocity, response time, resolution and flexibility. To demonstrate flexibility, we show the stable thrust force and velocity even when the Coil Spring is bent to a bending radius of 15 mm.
Dieter Schramm - One of the best experts on this subject based on the ideXlab platform.
-
Durability assessment of suspension Coil Spring considering the multifractality of road excitations
Measurement, 2020Co-Authors: C. H. Chin, S. S. K. Singh, S. Abdullah, Ahmad Kamal Ariffin, Dieter SchrammAbstract:Abstract This study presents the characterisation of multifractality of road excitation time series under different road conditions for prediction of the durability of a suspension Coil Spring. Road excitation acceleration signals and strain signals were acquired from the suspension system of a vehicle travelling under different road conditions. Multifractal analysis revealed a higher tendency to multifractality in road excitations with more surface irregularities. With the fatigue lives predicted by different strain-life models (Coffin-Manson, Morrow, and Smith-Watson-Topper), fatigue life prediction linear models based on road multifractality were established. It was found that the Morrow-based linear model gave the most accurate estimation of fatigue life, with the highest R2 of 0.8762. In conclusion, the models for the prediction of Coil Springs’ fatigue life based on road multifractality provide an accurate and faster alternative for durability assessment of Coil Springs. This can significantly facilitate the design process of Coil Springs to meet industry requirements.
-
Correlation of Uniaxial and Multiaxial Fatigue Models for Automobile Spring Life Assessment
Experimental Techniques, 2019Co-Authors: Y S Kong, M. Z. Omar, Dieter Schramm, S. Abdullah, Sallehuddin Mohamed HarisAbstract:This paper presents a regression analysis of uniaxial and multiaxial fatigue life for automobile Coil Spring under various road excitations. Coil Spring is a suspension component with complex geometry and shear loading which is applied during operating conditions. Hence, uniaxial strain measurement for durability assessment of Coil Spring is insufficient because the loadings are non-proportional. Rosette strain signals of Coil Spring under five different road conditions were obtained and used as input to uniaxial strain-life and multiaxial critical plane models to predict the Spring fatigue life. During the multiaxial fatigue analysis, the strain biaxiality ratio of range 0.3 to 0.5 indicates the loadings as out-of-phase. Through a simple linear regression method, a linear regression model between uniaxial and multiaxial fatigue life were obtained with coefficient of determination value as high as 0.8696. This model provides significant contribution through correlating uniaxial to multiaxial fatigue life. Hence, uniaxial fatigue life predictions could be approximated to multiaxial for more conservative analysis through the application of generated linear models.
-
Evaluation of Energy-Based Model Generated Strain Signals for Carbon Steel Spring Fatigue Life Assessment
Metals, 2019Co-Authors: Y S Kong, M. Z. Omar, Dieter Schramm, S. Abdullah, Sallehuddin Mohamed HarisAbstract:This paper presents the evaluation of the automobile Coil-Spring strain-displacement relationship for strain signals generation and fatigue life predictions. The development of a strain and Spring vertical displacement relationship is significant because measuring vehicle wheel displacements and forces are complex and costly. Hence, there is a need to estimate the strain data using alternative measurement, such as vibration signals. In this analysis, strain and acceleration data were collected from a vehicle that has travelled on different road conditions. Through the material elastic strain energy and Spring potential energy relationship, a Coil-Spring parameterise strain-displacement relationship has been developed and evaluated using a scatter band and correlation approach. Using this proposed model, the strain time histories were obtained based on acceleration data. For fatigue life analysis, most of the predicted fatigue life was distributed in the acceptable range using the scatter band approach where the data correlated at coefficient of determination value (R2) of 0.8788. With a suitable correlation value, this analysis proposed an alternative strain generation method for suspension Coil Spring fatigue life prediction, which could significantly shorten the Spring development time.
-
the need to generate realistic strain signals at an automotive Coil Spring for durability simulation leading to fatigue life assessment
Mechanical Systems and Signal Processing, 2017Co-Authors: T. E. Putra, Dieter Schramm, S. Abdullah, Mohd. Zaki Nuawi, Tobias BruckmannAbstract:Abstract This study aims to accelerate fatigue tests using simulated strain signals. Strain signals were acquired from a Coil Spring involving car movements. Using a mathematical expression, the measured strain signals yielded acceleration signals, and were considered as disturbances on generating strain signals. The simulated strain signals gave the testing time deviation by only 1.5%. The wavelet-based data editing was applied to shorten the strain signals time up to 36.7% and reduced the testing time up to 33.9%. In conclusion, the simulated strain signals were able to maintain the majority of fatigue damage and decreased the testing time.
-
Mission profiling of road data measurement for Coil Spring fatigue life
Measurement, 2017Co-Authors: Y S Kong, M. Z. Omar, Dieter Schramm, Sallehuddin Mohamed Haris, S. Abdullah, Tobias BruckmannAbstract:Abstract This study presents the mission profiling of three road conditions to assess the fatigue life of vehicle Coil Spring. Identifying all the service conditions of vehicle components, which indicate different possible situations and events, is crucial for the design of such components. Analyzing loading profiles prevents the over design or under design of components, which may lead to wastage or unexpected failure. Every road condition is different because of surface roughness. Acceleration signals were collected and processed using the shock response spectrum and extreme response spectrum methods for transient and stationary events, respectively. Mission profiling was performed to synthesize the equivalent power spectrum density (PSD) load profile for different uses of roads. The resulting PSD indicated that the greater involvement of the rural road reduced the lifetime of Coil Spring. The synthesized PSD was validated through the mean value of the responses. Fatigue life of the Spring was compared to a concatenated strain life measurement using a conservative approach. This research revealed the generation of accurate road loading profile with measurement of acceleration from different roads for Spring fatigue studies.
Murthi Prasad G Rao - One of the best experts on this subject based on the ideXlab platform.
-
design and analysis of two wheeler shock absorber Coil Spring
International Journal of Research, 2018Co-Authors: Murthi Prasad G RaoAbstract:In vehicles problem happens while driving on bumping road condition. The objective of this project is to design and analyze the performance of Shock absorber by varying the wire diameter of the Coil Spring. The Shock absorber which is one of the Suspension systems is designed mechanically to handle shock impulse and dissipate kinetic energy. It reduces the amplitude of disturbances leading to increase in comfort and improved ride quality. The Spring is compressed quickly when the wheel strikes the bump. The compressed Spring rebound to its normal dimension or normal loaded length which causes the body to be lifted. The Spring goes down below its normal height when the weight of the vehicle pushes the Spring down. This, in turn, causes the Spring to rebound again. The Spring bouncing process occurs over and over every less each time, until the up-and-down movement finally stops. The vehicle handling becomes very difficult and leads to uncomfortable ride when bouncing is allowed uncontrolled. Hence, the designing of Spring in a suspension system is very crucial. The analysis is done by considering bike mass, loads, and no of persons seated on bike. Comparison is done by varying the wire diameter of the Coil Spring to verify the best dimension for the Spring in shock absorber. Modeling and Analysis is done using Pro/ENGINEER and ANSYS respectively.
S. Abdullah - One of the best experts on this subject based on the ideXlab platform.
-
Durability assessment of suspension Coil Spring considering the multifractality of road excitations
Measurement, 2020Co-Authors: C. H. Chin, S. S. K. Singh, S. Abdullah, Ahmad Kamal Ariffin, Dieter SchrammAbstract:Abstract This study presents the characterisation of multifractality of road excitation time series under different road conditions for prediction of the durability of a suspension Coil Spring. Road excitation acceleration signals and strain signals were acquired from the suspension system of a vehicle travelling under different road conditions. Multifractal analysis revealed a higher tendency to multifractality in road excitations with more surface irregularities. With the fatigue lives predicted by different strain-life models (Coffin-Manson, Morrow, and Smith-Watson-Topper), fatigue life prediction linear models based on road multifractality were established. It was found that the Morrow-based linear model gave the most accurate estimation of fatigue life, with the highest R2 of 0.8762. In conclusion, the models for the prediction of Coil Springs’ fatigue life based on road multifractality provide an accurate and faster alternative for durability assessment of Coil Springs. This can significantly facilitate the design process of Coil Springs to meet industry requirements.
-
Correlation of Uniaxial and Multiaxial Fatigue Models for Automobile Spring Life Assessment
Experimental Techniques, 2019Co-Authors: Y S Kong, M. Z. Omar, Dieter Schramm, S. Abdullah, Sallehuddin Mohamed HarisAbstract:This paper presents a regression analysis of uniaxial and multiaxial fatigue life for automobile Coil Spring under various road excitations. Coil Spring is a suspension component with complex geometry and shear loading which is applied during operating conditions. Hence, uniaxial strain measurement for durability assessment of Coil Spring is insufficient because the loadings are non-proportional. Rosette strain signals of Coil Spring under five different road conditions were obtained and used as input to uniaxial strain-life and multiaxial critical plane models to predict the Spring fatigue life. During the multiaxial fatigue analysis, the strain biaxiality ratio of range 0.3 to 0.5 indicates the loadings as out-of-phase. Through a simple linear regression method, a linear regression model between uniaxial and multiaxial fatigue life were obtained with coefficient of determination value as high as 0.8696. This model provides significant contribution through correlating uniaxial to multiaxial fatigue life. Hence, uniaxial fatigue life predictions could be approximated to multiaxial for more conservative analysis through the application of generated linear models.
-
Evaluation of Energy-Based Model Generated Strain Signals for Carbon Steel Spring Fatigue Life Assessment
Metals, 2019Co-Authors: Y S Kong, M. Z. Omar, Dieter Schramm, S. Abdullah, Sallehuddin Mohamed HarisAbstract:This paper presents the evaluation of the automobile Coil-Spring strain-displacement relationship for strain signals generation and fatigue life predictions. The development of a strain and Spring vertical displacement relationship is significant because measuring vehicle wheel displacements and forces are complex and costly. Hence, there is a need to estimate the strain data using alternative measurement, such as vibration signals. In this analysis, strain and acceleration data were collected from a vehicle that has travelled on different road conditions. Through the material elastic strain energy and Spring potential energy relationship, a Coil-Spring parameterise strain-displacement relationship has been developed and evaluated using a scatter band and correlation approach. Using this proposed model, the strain time histories were obtained based on acceleration data. For fatigue life analysis, most of the predicted fatigue life was distributed in the acceptable range using the scatter band approach where the data correlated at coefficient of determination value (R2) of 0.8788. With a suitable correlation value, this analysis proposed an alternative strain generation method for suspension Coil Spring fatigue life prediction, which could significantly shorten the Spring development time.
-
the need to generate realistic strain signals at an automotive Coil Spring for durability simulation leading to fatigue life assessment
Mechanical Systems and Signal Processing, 2017Co-Authors: T. E. Putra, Dieter Schramm, S. Abdullah, Mohd. Zaki Nuawi, Tobias BruckmannAbstract:Abstract This study aims to accelerate fatigue tests using simulated strain signals. Strain signals were acquired from a Coil Spring involving car movements. Using a mathematical expression, the measured strain signals yielded acceleration signals, and were considered as disturbances on generating strain signals. The simulated strain signals gave the testing time deviation by only 1.5%. The wavelet-based data editing was applied to shorten the strain signals time up to 36.7% and reduced the testing time up to 33.9%. In conclusion, the simulated strain signals were able to maintain the majority of fatigue damage and decreased the testing time.
-
Mission profiling of road data measurement for Coil Spring fatigue life
Measurement, 2017Co-Authors: Y S Kong, M. Z. Omar, Dieter Schramm, Sallehuddin Mohamed Haris, S. Abdullah, Tobias BruckmannAbstract:Abstract This study presents the mission profiling of three road conditions to assess the fatigue life of vehicle Coil Spring. Identifying all the service conditions of vehicle components, which indicate different possible situations and events, is crucial for the design of such components. Analyzing loading profiles prevents the over design or under design of components, which may lead to wastage or unexpected failure. Every road condition is different because of surface roughness. Acceleration signals were collected and processed using the shock response spectrum and extreme response spectrum methods for transient and stationary events, respectively. Mission profiling was performed to synthesize the equivalent power spectrum density (PSD) load profile for different uses of roads. The resulting PSD indicated that the greater involvement of the rural road reduced the lifetime of Coil Spring. The synthesized PSD was validated through the mean value of the responses. Fatigue life of the Spring was compared to a concatenated strain life measurement using a conservative approach. This research revealed the generation of accurate road loading profile with measurement of acceleration from different roads for Spring fatigue studies.