scholarly journals Pemodelan Simulasi Tabung Penyerap Energi Crash Box Sebagai Teknologi Keselamatan Pasif Berbasis Software FEM (Finite Elemen Methode)

2021 ◽  
Vol 3 ◽  
pp. 33-40
Author(s):  
Willy Wirawan ◽  
Adya Aghastya ◽  
Septiana Widi Astuti ◽  
Natriya Faisal Rachman ◽  
Suprapto Suprapto ◽  
...  
Keyword(s):  
Force Reaction

Crash box adalah salah satu komponen keselamatan pasif pada berbagai transportasiyang berfungsi sebagai perangkat penyerap energi tumbukan untuk mengurangi terjadinya cidera pada pengemudi maupun penumpang akibat tabrakan atau kecelakaan. Pada penelitian ini bertujuan untuk mengetahui nilai penyerapan energi dan pola deformasi yang dihasilkan pada crash box yang berbentuk tabung lingkaran satu segmen. Metode pada penelitian ini menggunakan eksperimen semu menggunakan simulasi software berbasis elemen hingga (finite elemen methode). Variable pada penelitian meliputi panjang tabung 300 mm dengan variasi tebal 1,5 dan 3 mm dan diameter tabung sebesar 120 mm. eksperimental semu crash box akan dilakukan uji tabrak quasi static dengan impactor masa 200 kg dan kecepatan 10 m/s. Simulasi pada crash box diobservasi berdasarkan nilai serapan energi, force reaction dan pola deformasi yang terbentuk. Hasil simulasi dapat diketahui bahwa nilai serapan energi tertinggi terdapat pada crash box tebal 3 mm sebesar 790000 Joule dan force reaction 230000 N. Dapat dilihat bahwa pola deformasi yang terbentuk cenderung buckling pada crash box tebal 1,5 mm dan membentuk pola concertina pada crash box tebal 3 mm.

scholarly journals APPLICATION OF DOMAIN INTEGRATED DESIGN METHODOLOGY FOR BIO-INSPIRED DESIGN- A CASE STUDY OF SUTURE PIN DESIGN

2021 ◽  
Vol 1 ◽  
pp. 487-496
Author(s):  
Pavan Tejaswi Velivela ◽  
Nikita Letov ◽  
Yuan Liu ◽  
Yaoyao Fiona Zhao
Keyword(s):  
Cross Sections ◽  
Design Methodology ◽  
Reaction Force ◽  
Integrated Design ◽  
Total Deformation ◽  
Insertion Force ◽  
Force Reaction ◽  
The Moment ◽  
Work Done

AbstractThis paper investigates the design and development of bio-inspired suture pins that would reduce the insertion force and thereby reducing the pain in the patients. Inspired by kingfisher's beak and porcupine quills, the conceptual design of the suture pin is developed by using a unique ideation methodology that is proposed in this research. The methodology is named as Domain Integrated Design, which involves in classifying bio-inspired structures into various domains. There is little work done on such bio-inspired multifunctional aspect. In this research we have categorized the vast biological functionalities into domains namely, cellular structures, shapes, cross-sections, and surfaces. Multi-functional bio-inspired structures are designed by combining different domains. In this research, the hypothesis is verified by simulating the total deformation of tissue and the needle at the moment of puncture. The results show that the bio-inspired suture pin has a low deformation on the tissue at higher velocities at the puncture point and low deformation in its own structure when an axial force (reaction force) is applied to its tip. This makes the design stiff and thus require less force of insertion.

scholarly journals Based on MATLAB and Adams new pruning cutting edge shape and shear force simulation

2018 ◽  
Vol 175 ◽  
pp. 03065
Author(s):  
Hang Yin ◽  
Zhaoxin Meng ◽  
Yu Zhang ◽  
Bo Yu
Keyword(s):  
Shear Force ◽  
Green Manufacturing ◽  
Cutting Edge ◽  
Shear Mode ◽  
Force Reaction ◽  
Shear Performance ◽  
New Type ◽  
Indispensable Tool ◽  
Save Energy ◽  
Tree Branch

Pruning is an indispensable tool for gardening. The pruning mechanism of pruning scissors and the shape of the cutting edge directly affect the efficiency of shear. Therefore, it is of great significance to design a new type of pruning scissors to improve the efficiency of garden work. It accords with the concept of green manufacturing energy-saving and environmental protection. The blade shape directly affects the shear efficiency. Therefore, the blade of the best Angle can improve the shear efficiency and save energy. According to the motion track of the moving blade and the shear mode. Using MATLAB software to simulate the shape of the blade of the best Angle. This work is instructive to the design of the blade. The force of the blade in the working process of shear force reaction scissors. Using Adams software, the dynamic simulation of tree branch was carried out. It is helpful to verify the shear performance of new pruning shears.

Fractionated Reaction Time as a Function of Magnitude of Force in Simple and Choice Conditions

1997 ◽  
Vol 85 (2) ◽  
pp. 435-444 ◽  
Author(s):  
Masanobu Ito
Keyword(s):  
Reaction Time ◽  
Grip Strength ◽  
Choice Reaction Time ◽  
Peak Force ◽  
Constant Amount ◽  
Premotor Time ◽  
Force Reaction ◽  
The Subject ◽  
Maximum Grip Strength ◽  
Maximum Grip

The present study examined whether varying magnitude of force required to perform an isometric response influences fractionated reaction time in simple and choice conditions and whether reaction time and premotor time to initiate the response are shorter when force is selected freely by the subject than when it is selected by the experimenter. 20 subjects were required to react and produce a designated peak force as quickly and accurately as possible by squeezing a handle after a reaction signal. Four different magnitudes of force were 30, 50, and 70% of the maximum grip strength of the subjects and subject-selected magnitude of force. Reaction time and premotor time did not change across the range of forces examined in both simple and choice reaction-time conditions regardless of whether a desired force was selected by the experimenter or by the subject These findings suggest that programming an isometric response may require a constant amount of time.

Force, Reaction Time, and Precision of Kung Fu Strikes

2009 ◽  
Vol 109 (1) ◽  
pp. 295-303 ◽  
Author(s):  
Osmar Pinto Neto ◽  
Marcos Tadeu Tavares Pacheco ◽  
Richard Bolander ◽  
Cynthia Bir
Keyword(s):  
Reaction Time ◽  
Body Mass ◽  
Pressure Sensor ◽  
Martial Arts ◽  
High Speed ◽  
Load Cell ◽  
Men And Women ◽  
Kung Fu ◽  
Force Reaction ◽  
Force Data

The goal was to compare values of force, precision, and reaction time of several martial arts punches and palm strikes performed by advanced and intermediate Kung Fu practitioners, both men and women. 13 Kung Fu practitioners, 10 men and three women, participated. Only the men, three advanced and seven intermediate, were considered for comparisons between levels. Reaction time values were obtained using two high speed cameras that recorded each strike at 2500 Hz. Force of impact was measured by a load cell. For comparisons of groups, force data were normalized by participant's body mass and height. Precision of the strikes was determined by a high speed pressure sensor. The results show that palm strikes were stronger than punches. Women in the study presented, on average, lower values of reaction time and force but higher values of precision than men. Advanced participants presented higher forces than intermediate participants. Significant negative correlations between the values of force and precision and the values of force and reaction time were also found.

scholarly journals Single Stage Autonomous Solar Water Pumping System Using PI and Fuzzy Controllers

2021 ◽  
Vol 9 (VII) ◽  
pp. 3539-3552
Author(s):  
Bujula Harikrishnareddy
Keyword(s):  
Vector Control ◽  
Single Stage ◽  
Transitional Stage ◽  
Middle Stage ◽  
Pumping System ◽  
Water Pumping ◽  
Force Reaction ◽  
Real Value ◽  
Energy Assets ◽  
Petroleum Derivatives

Sustainable powerage and viable use of accessible energy assets have arisen as an commendable panacea for expanding carbon impression, draining petroleum derivatives, expanding a dangerous atmospheric deviation and changing meteorological situations. Flawless nature, silent activity and bountiful accessibility even at distant areas, have made the sunlight based energy finest form of RE accessible in the current situation .The work presents a introverted stage independent sun oriented photovoltaic exhibit take care of water siphoning framework utilizing a long-lasting magnet simultaneous engine. The crucial commitment of this work incorporates advancement of novel altered vector control, which improves the force reaction of the framework and improvement of a novel single stage variable advance size gradual conductance strategy, which gives a quick greatest force point following and dispenses with the need of transitional stage DC-DC converter. A corresponding indispensable control diminishes the mistake among reference and real value. The utilization of single stage geography has killed middle stage DC-DC converter and diminished the quantity of components, consequently bringing about decrease of the expense, intricacy and increment efficiency .The expansion of this activities rather than PI regulators that we need to Fuzzy and PI regulators .Utilizing this controllers step reaction of speed increases, Dc-connect voltage increases and force speed proportion is all the more then, at that point power stream will be improved. The framework execution has been examined through Matlab /simulink recreation investigation

On the End-Point Deflection of Static Balanced Manipulators With Various Spring Configurations

2019 ◽  
Author(s):  
Chi-Shiun Jhuang ◽  
Dar-Zen Chen
Keyword(s):  
Reaction Force ◽  
Gravitational Energy ◽  
Elastic Matrix ◽  
Static Balance ◽  
End Point ◽  
Force Reaction ◽  
Spring Force ◽  
Global Workspace ◽  
Maximum Minimum

Abstract This paper presented the accumulation deflection of manipulator with different spring configuration. Spring configurations achieve perfect static balance but they are different in deflection. Assuming the axial deflection is enough smaller than bending deflection and negligible; deflection is small and the link is rigid. Based on gravitational and elastic matrix, for most effective balancing, attachment angles of a spring are determined as four types (90, 0), (270, 90), (0,0) and (180,180). Attachment lengths of a spring are determined by magnitude of gravitational energy. Then, spring force, reaction force and deflection are determined. For illustrated examples, a given manipulator with configuration 4-1 S23 (180,180), S23 (0,0) and 4-2 S34 (180,180), S34 (0,0), the accumulation deflection in global workspace and maximum, minimum and RMS accumulation deflection are presented. In conclusion, the spring configuration 4-1 with S23 (180,180) is the best choice for designers.

Moving Performance of Crawler Driven ROV on the Inclined Sea Bottom

2010 ◽  
Author(s):  
Tokihiro Katsui ◽  
Hisataka Murakami ◽  
Satoshi Kajikawa ◽  
Tomoya Inoue
Keyword(s):  
Vertical Direction ◽  
Normal Operation ◽  
Hydrodynamic Resistance ◽  
Light Weight ◽  
Gravity Center ◽  
Balance Condition ◽  
Sea Bottom ◽  
Force Reaction ◽  
Conditional Equation ◽  
Turn Over

The crawler driven ROV is considered as one of the probable systems for seafloor exploration or seabed resources development [1][2][3][4]. However the movability of crawler driven ROV on the sea bottom is not explained clearly compared with the ones on the land [5][6][7][8][9]. The experimental investigation on the crawler based ROV’s movability suggests that light weight ROV are easy to run in bow up condition and sometimes are possible to turn over. Therefore it is important to make it clear what kind of condition is to be satisfied for the normal run when the ROV moves on the sea bottom with crawlers. In this study, a simple dynamic model for the ROV which runs steadily on the inclined smooth sea bottom has been developed and the condition which should be satisfied for normal running has been derived. We consider that the forces acting on ROV are gravity, buoyancy, reaction from sea bottom, thrust and hydrodynamic resistance and treat them as concentrated loads. From the balance condition of forces for longitudinal and vertical direction and pitching moment, three kinds of relation are obtained. We consider that force reaction point from sea bottom should be inside between the fore and rear wheels for the normal operation. With this condition, the relation to be satisfied between the location of gravity center and center of buoyancy is obtained. To validate this conditional equation, the model experiments are carried out. The ROV model contains several weights and floating materials so that the longitudinal center of gravity and buoyancy can be changed by moving the weights and floats. Changing the longitudinal location of buoyancy center of the model from backward to forward, the limiting normal running condition for each longitudinal location of gravity center are measured. The obtained experimental results agree well with the theoretical ones. The presented conditional equation to be satisfied for normal running is considered to support the basic planning of a crawler driven ROV.

scholarly journals Experimental Analysis of FSW Process Forces

2020 ◽  
Vol 44 (2) ◽  
pp. 51-56
Author(s):  
Tadeusz Balawender ◽  
Piotr Myśliwiec
Keyword(s):  
Research Work ◽  
Welding Process ◽  
Thermal Conditions ◽  
Friction Stir ◽  
Process Forces ◽  
Force Reaction ◽  
Linear Friction ◽  
Magnesium Az31 ◽  
Two Stages

AbstractThis paper presents the results of research work on linear friction stir welding (FSW) of magnesium AZ31 and aluminum 2024 alloys. During the FSW process, forces exerted by a tool on joined materials were measured. The measurements of forces were taken in three directions, vertical (Z axis) and horizontal (X and Y axes) directions, using high-sensitive piezoelectric dynamometer. The force analysis was done for three stages of welding process: plunging, dwelling, and welding. Conclusions regarding the force reaction of materials to be welded were formulated. It was found that the first two stages of the process, plunging and dwelling, are very important for the correct welding. In the plunging stage, a tool exerts the greatest forces and unit pressures (at the Z direction) on joined materials; during the dwelling stage, thermal conditions of the process are established. The welding stage was divided into two substages: the initial unstable and the subsequent long-term stabilized one.

Compensation of Transfer Deviation on Symmetry Type Bilateral Servo Mechanism

1991 ◽  
Vol 3 (4) ◽  
pp. 320-327
Author(s):  
Kazuo Kanzaki ◽  
◽  
Nobuaki Kobayashi ◽  
Tadashi Yamada ◽  
Keyword(s):  
Force Feedback ◽  
Type System ◽  
Feedback System ◽  
Symmetry Type ◽  
Damping Factor ◽  
Inertia Moment ◽  
Feedback Type ◽  
Force Reaction ◽  
Servo Mechanism ◽  
Generator Output

There are two types of bilateral servo mechanisms utilized in force reaction type manipulators. The simple symmetry type has the larger transfer deviation. The force feedback type with the smaller transfer deviation requires troublesome force sensing devices. This paper describes a simple compensation method of transfer deviation on the symmetry-type. We found that transfer deviation of the torque decreases by means of subtracting tachometer generator output through a PD circuit from the driving input of the opposite motor. The system is unstable when the gain constants in compensation circuits are over the limits, which are determined as equivalent mechanical inertia moment and viscous damping factor. The transfer deviation of the compensated symmetry type system is near to that of the force feedback system.

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