• Title/Summary/Keyword: Grasping Force

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Development of Cylindrical-object Grasping Force Measuring System with Haptic Technology for Stroke's Fingers (햅틱기술을 이용한 뇌졸중환자의 원통물체잡기 힘측정장치 개발)

  • Kim, Hyeon Min;Kim, Gab Soon
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.3
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    • pp.300-307
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    • 2013
  • This paper describes the development of a cylindrical-object grasping force measuring system applied haptic technology to measure the grasping force of strokes patients' fingers and other patients' paralyzed fingers. Because the cylindrical-object and the force measuring device of the developed cylindrical-object grasping force measuring system are connected with the electrical wires, patients and their families have difficulty not only measuring the patients' grasping force using the system but also knowing their rehabilitation extent when using it. In this paper, the cylindrical-object grasping force measuring system applied haptic technology was developed, and the cylindrical-object grasping force measuring device sends data to the rehabilitation evaluating system applied haptic technology by wireless communication. The grasping force measurement characteristic test using the system was carried out, and it was confirmed that the rehabilitation extent of the patients' paralyzed fingers and normal people fingers can be evaluated.

Development of Two-Finger Force Measuring System to Measure Two-Finger Gripping Force and Its Characteristic Evaluation (단축 힘센서를 이용한 두 손가락 잡기 힘측정장치 개발 및 특성평가)

  • Kim, Hyeon-Min;Shin, Hi-Suk;Yoon, Joung-Won;Kim, Gab-Soon
    • Journal of Sensor Science and Technology
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    • v.20 no.3
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    • pp.172-177
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    • 2011
  • Finger patients can't use their hands because of the paralysis their fingers. Their fingers are recovered by rehabilitating training, and the rehabilitating extent can be judged by measuring the pressing force to be contacted with two fingers(thumb and first finger, thumb and middle finger, thumb and ring finger, thumb and little finger). At present, most hospitals have used a thin plastic-plate for measuring the two-finger grasping force, and we can only judge that they can grasp the plate with their two-finger through it, because the plate can't measure the two-finger grasping force. But, recently, the force measuring system for measuring two-finger grasping force was developed using three-axis force sensor, but it is very expensive, because it has a three-axis force sensor. In this paper, two-finger force measuring system with a one-axis force sensor which can measure two-finger grasping force was developed. The one-axis force sensor was designed and fabricated, and the force measuring device was designed and manufactured using DSP(Digital Signal Processing). Also, the grasping force test of men was performed using the developed two-finger force measuring system, it was confirmed that the grasping forces of men were different according to grasping methods, and the system can be used for measuring two-finger grasping force.

An analysis of the grasping pose of robot using force / torque information (힘 및 토오크 정보를 이용한 로보트의 잡는 자세 해석)

  • 박시영;정재옥;이범희;고명삼
    • 제어로봇시스템학회:학술대회논문집
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    • 1991.10a
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    • pp.517-522
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    • 1991
  • In this paper, robot's grasping poses are classified into three cases, and force/torque information in each grasping pose is analyzed. In the grasping process, error between the desired and the actual grasping poses can be generated because of uncertainty in the environment. A systematic algorithm is presented, that uses the force/torque information generated by grasping pose error to estimate robot's actual grasping pose.

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Artificial Neural Network for Stable Robotic Grasping (안정적 로봇 파지를 위한 인공신경망)

  • Kim, Kiseo;Kim, Dongeon;Park, Jinhyun;Lee, Jangmyung
    • The Journal of Korea Robotics Society
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    • v.14 no.2
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    • pp.94-103
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    • 2019
  • The optimal grasping point of the object varies depending on the shape of the object, such as the weight, the material, the grasping contact with the robot hand, and the grasping force. In order to derive the optimal grasping points for each object by a three fingered robot hand, optimal point and posture have been derived based on the geometry of the object and the hand using the artificial neural network. The optimal grasping cost function has been derived by constructing the cost function based on the probability density function of the normal distribution. Considering the characteristics of the object and the robot hand, the optimum height and width have been set to grasp the object by the robot hand. The resultant force between the contact area of the robot finger and the object has been estimated from the grasping force of the robot finger and the gravitational force of the object. In addition to these, the geometrical and gravitational center points of the object have been considered in obtaining the optimum grasping position of the robot finger and the object using the artificial neural network. To show the effectiveness of the proposed algorithm, the friction cone for the stable grasping operation has been modeled through the grasping experiments.

Development of Force Measuring System using Three-axis Force Sensor for Measuring Two-finger Force (3축 힘센서를 이용한 두 손가락 힘측정장치 개발)

  • Kim, Hyeon-Min;Yoon, Jong-Won;Shin, Hee-Suk;Kim, Gab-Soon
    • Journal of Institute of Control, Robotics and Systems
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    • v.16 no.9
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    • pp.876-882
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    • 2010
  • Stroke patients can't use their hands because of the paralysis their fingers. Their fingers are recovered by rehabilitating training, and the rehabilitating extent can be judged by measuring the pressing force to be contacted with two fingers (thumb and first finger, thumb and middle finger, thumb and ring finger, thumb and little finger). But, at present, the grasping finger force of two-finger can't be accurately measured, because there is not a proper finger-force measuring system. Therefore, doctors can't correctly judge the rehabilitating extent. So, the finger-force measuring system which can measure the grasping force of two-finger must be developed. In this paper, the finger-force measuring system with a three-axis force sensor which can measure the pressing force was developed. The three-axis force sensor was designed and fabricated, and the force measuring device was designed and manufactured using DSP (Digital Signal Processing). Also, the grasping force test of men was performed using the developed finger-force measuring system, it was confirmed that the grasping forces of men were different according to grasping methods.

Development of Cylindrical-type Finger Force Measuring System Using Two-axis Force/Moment Sensor and its Characteristic Evaluation (2축 힘/모멘트센서를 이용한 원통형 손가락 힘측정장치 개발 및 특성평가)

  • Kim, Gab-Soon
    • Journal of Institute of Control, Robotics and Systems
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    • v.17 no.5
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    • pp.484-489
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    • 2011
  • Some patients can't use their hands because of inherent and acquired paralysis of their fingers. Their fingers can recover with rehabilitative training, and the extent of rehabilitation can be judged by grasping a cylindrical-object with their fingers. At present, the cylindrical-object used in hospitals is only a cylinder which cannot measure grasping force of the fingers. Therefore, doctors must judge the extent of rehabilitation by watching patients' fingers as they grasp the cylinder. A cylindrical-type finger force measuring system which can measure the grasping force of patients' fingers should be developed. This paper looks at the development of a cylindrical-type finger force measuring system with two-axis force/moment sensor which can measure grasping force. The two-axis force/moment sensor was designed and fabricated, and the high-speed force measuring device was designed and manufactured by using DSP (digital signal processing). Also, cylindrical-type finger force measuring system was developed using the developed two-axis force/moment sensor and the high-speed force measuring device, and the grasping force tests of men were performed using the developed system. The tests confirm that the average finger forces of right and left hands for men were about 186N and 172N respectively.

An experimental study on the operation characteristics of tele-grasping (원격 파지의 조작 특성에 관한 실험적 연구)

  • 김종태;김회주;권대규;유기호
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1101-1104
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    • 2003
  • In this paper, we performed the study on the operation characteristics of tele-grasping using the developed experimental system. The experimental system consists of master and slave gripper. and signal processing system. For the stable grasping of an object, this system feedback the normal force obtained from the straingage of the slave gripper to magnetic particle brake of the master gripper through the signal processing system. This experimental system can control the grasping force in remote using the force feedback device. Some experimental results of the-tele-grasping are presented and discussed

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Development of Finger-force Measuring System with Six-axis Force/moment Sensor for Measuring a Spherical-object Grasping Force (6 축 힘/모멘트센서를 이용한 구물체 잡기 손가락 힘측정장치 개발)

  • Kim, Hyeon-Min;Yoon, Joung-Won;Shin, Hee-Suk;Kim, Gab-Soon
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.11
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    • pp.37-45
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    • 2010
  • Stroke patients can't use their hands because of the paralysis of their fingers. Their fingers are recovered by rehabilitating training, and the rehabilitating extent can be judged by grasping a spherical object. At present, the used object in hospital is only a spherical object, and can't measure the force of fingers. Therefore, doctors judge the rehabilitating extent by touching and watching at their fingers. So, the spherical object measuring system which can measure the force of their fingers should be developed. In this paper, the finger-force measuring system with a six-axis force/moment sensor which can measure the spherical-object grasping force is developed. The six-axis force/moment sensor was designed and fabricated, and the force measuring device was designed and manufactured using DSP (digital signal processing). Also, the grasping force test of men was performed using the developed finger-force measuring system, it was confirmed that the average force of men was about 120N.

Development of finger-force measuring system with three-axis force sensor for measuring a spherical-object grasping force (3축 힘센서를 이용한 구물체 잡기 손가락 힘측정시스템 개발)

  • Kim, Hyeon-Min;Kim, Gab-Soon
    • Journal of Sensor Science and Technology
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    • v.19 no.3
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    • pp.238-245
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    • 2010
  • Stroke patients can't use their hands because of the paralysis of their fingers. Their fingers are recovered by rehabilitating training, and the rehabilitating extent can be judged by grasping a spherical object. At present, the object used in hospital is only a spherical object, and can't measure the force of fingers. Therefore, doctors judge the rehabilitating extent by touching and watching at their fingers. So, the spherical object measuring system which can measure the force of their fingers should be developed. In this paper, the finger-force measuring system with a three-axis force sensor which can measure the spherical-object grasping force is developed. The three-axis force sensor is designed and fabricated, and the force measuring device is designed and manufactured using DSP(digital signal processing). Also, the grasping force test of men is performed using the developed finger-force measuring system, it was confirmed that the average force of men was about 120 N.

A Tactilely Transparent Soft Glove with High Grasping Force (높은 파지력을 가지며 촉감을 전달할 수 있는 유연한 글러브)

  • Jeong, Yong-Jun;Kim, Jong-In;Jeon, Hyeong-Seok;Lee, Deok-Won;Kim, Yong-Jae
    • Journal of Institute of Control, Robotics and Systems
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    • v.22 no.12
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    • pp.1011-1020
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    • 2016
  • This paper introduces a tactilely transparent soft glove composed of soft materials and flexible structures. Although it is hard to achieve a high grasping force with conventional grip-assist gloves made from soft material, the proposed glove can exert a high force by using a novel structure. This structure has a triangular shape composed of flexible structural frames, soft fabric, and belts. It can produce grip-assist moment compliantly without harmful force or misalignment with the human fingers. The whole finger part that comes into contact with objects is made of thin and soft fabric in order to facilitate sensation transference. The proposed tactilely transparent soft glove enables the user to manipulate various objects owing to both the softness and high grasping force; it helps lifting heavy weight objects as well as permitting delicate tactile feeling on the palm and fingers. The proposed concept was applied to a two-finger grip-assist device for validation. In addition, the experimental results regarding grasping objects, fingertip force, and grasping force are presented.