scholarly journals The Point Digit II: Mechanical Design and Testing of a Ratcheting Prosthetic Finger

2021 ◽  
Vol 186 (Supplement_1) ◽  
pp. 674-680
Author(s):  
Jacob L Segil ◽  
Ben Pulver ◽  
Stephen Huddle ◽  
Richard F ff Weir ◽  
Levin Sliker
Keyword(s):  
Mechanical Design ◽  
Mechanical Tests ◽  
Load Test ◽  
Functional Abilities ◽  
Static Load Test ◽  
Dynamic Load Test ◽  
Hand Amputation ◽  
Prosthetic Finger ◽  
Design And Testing ◽  
Unique Mechanism

ABSTRACT Introduction People with partial hand loss represent the largest population of upper limb amputees by a factor of 10. The available prosthetic componentry for people with digit loss provide various methods of control, kinematic designs, and functional abilities. Here, the Point Digit II is empirically tested and a discussion is provided comparing the Point Digit II with the existing commercially available prosthetic fingers. Materials and Methods Benchtop mechanical tests were performed using prototype Point Digit II prosthetic fingers. The battery of tests included a static load test, a static mounting tear-out test, a dynamic load test, and a dynamic cycle test. These tests were implemented to study the mechanisms within the digit and the ability of the device to withstand heavy-duty use once out in the field. Results The Point Digit II met or exceeded all geometric and mechanical specifications. The device can withstand over 300 lbs of force applied to the distal phalange and was cycled over 250,000 times without an adverse event representing 3 years of use. Multiple prototypes were utilized across all tests to confirm the ability to reproduce the device in a reliable manner. Conclusions The Point Digit II presents novel and exciting features to help those with partial hand amputation return to work and regain ability. The use of additive manufacturing, unique mechanism design, and clinically relevant design features provides both the patient and clinician with a prosthetic digit, which improves upon the existing devices available.

Study on Detection Method of Bridge Structure Based on Quasi-Static Test

2014 ◽  
Vol 501-504 ◽  
pp. 1148-1151
Author(s):  
Chun Heng Feng ◽  
Yan Gao ◽  
Xi Sha Jin ◽  
Xing Na Shi
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Dynamic Load ◽  
Static Load ◽  
Element Model ◽  
Load Test ◽  
Bridge Structure ◽  
Static Load Test ◽  
Static Test ◽  
Dynamic Load Test

Currently the bridge structure detections are mainly based on static load test and dynamic load test. The static load test has shortcomings of less test data, long time-consumption and high cost. However, the dynamic load test has the advantages of quick and convenient, its related technologies and theories are still not mature enough. To solve this problem, the detection of bridge structure based on quasi-static test is proposed in this paper. Quasi-static load is applied on the structure by moving the standard load vehicle slowly. Then create the structural finite element model and modify the model according to the measured data to make it consistent with the actual structure. The bridge actual structural mechanical properties can be acquired by conducting load test on the optimized structural finite element model. By doing this, the bridge safety could be evaluated quickly.

Static and Dynamic Experiment of the Behavior of the Constructed Hanjiang Super-Major Railway Bridge in Laohekou

2011 ◽  
Vol 255-260 ◽  
pp. 1230-1235 ◽  
Author(s):  
Zhi Wei Qi ◽  
Shu Jun Fang ◽  
Guan Dong Lin ◽  
Hua Wang
Keyword(s):  
Dynamic Load ◽  
Working Condition ◽  
Damping Ratio ◽  
Load Test ◽  
Experimental Results ◽  
Natural Vibration Frequency ◽  
Railway Bridge ◽  
Static Load Test ◽  
Vibration Displacement ◽  
Dynamic Load Test

A static and dynamic load test is carried out on the constructed Hanjiang Super-major Railway Bridge in Laohekou to ensure the reliability of the bridge and test the carrying capacity and working condition of the bridge structure. The static load test is divided into three kinds of loading conditions, each of which tests the stress and deflection of the key sections of the bridge. The transverse vibration displacement of the piers and mid-span section is measured in the dynamic load test when the train is crossing the bridge at different speeds, and the vertical dynamic deflection of the mid-span section is also tested. The natural vibration frequency, the vibration types and the damping ratio of the whole bridge are measured in the pulsating experiment. Through the comparative analysis of the experimental results and the theoretical calculation results and standard, it can be concluded that the strength, the vertical and lateral stiffness of the bridge meet the requirements of both the design and specifications, and that the bridge is in a good working condition. The test and the analysis of the experimental results of the bridge can serve as a reference to the bridges of the same type.

Bridge Structure Performance Evaluation Based on Dynamic Load Test

2012 ◽  
Vol 238 ◽  
pp. 694-696 ◽  
Author(s):  
Yan Zeng
Keyword(s):  
Prestressed Concrete ◽  
Static Load ◽  
Load Test ◽  
Bridge Structure ◽  
Static Load Test ◽  
Box Girder ◽  
Dynamic Load Test ◽  
Actual Service ◽  
Calculation Results ◽  
Service State

Static load test was carried out on Hengshui interchange ramp bridge of Lin-Chang expressway. The superstructure of the bridge is cast-in-place prestressed concrete continuous box-girder. The actual service state of the bridge is analyzed by the comparison of experimental and calculation results. The study provides the initial technical files and the basis of acceptance, operation, maintenance and management for the bridge.

Inspection and Evaluation of Load-Bearing Capacity of Single Tower Composite Girder Cable-Stayed Bridge

2012 ◽  
Vol 538-541 ◽  
pp. 1785-1788
Author(s):  
Xie Dong Zhang ◽  
Jin Zhi Wang ◽  
Jun Feng Guo
Keyword(s):  
Bearing Capacity ◽  
Dynamic Load ◽  
Static Load ◽  
Load Test ◽  
Bridge Structure ◽  
Static Load Test ◽  
Test Measure ◽  
Cable Stayed Bridge ◽  
Composite Girder ◽  
Dynamic Load Test

In order to evaluate single tower composite girder Cable Bridge actual bearing capacity and working property on design using load, a single-tower composite girder cable-stayed bridge is taken as an example, by means of static load test, dynamic load test, reasonably measures evaluates the single tower composite girder cable-stayed bridge's bearing capacity. The static load test measure static properties of bridge structure (static strain, static deflection, etc.), dynamic load test, measure the dynamic properties of bridge structure (vibration frequency, damping, forced vibration amplitude, impact coefficient, etc.). Results show that the rigidity strength integrity and dynamic characteristics of bridge structure are favorable; the structure’s bearing capacity is favorable.

A new approach to the analysis of high-strain dynamic pile test data

1994 ◽  
Vol 31 (2) ◽  
pp. 246-253 ◽  
Author(s):  
Yves Robert
Keyword(s):  
Artificial Intelligence ◽  
Computer Program ◽  
Bearing Capacity ◽  
High Strain ◽  
Dynamic Test ◽  
Load Test ◽  
Case Method ◽  
Static Load Test ◽  
Pile Capacity ◽  
Dynamic Load Test

High-strain dynamic pile tests using the pile driving analyzer (PDA) and the Case method have been available in Canada for over 15 years. During that period of time, the hardware has evolved considerably but the way the data is interpreted has basically remained the same. The evaluation of the bearing capacity of the tested pile still uses the Case method, with the Case J factor being calculated either from the results of a static load test or, more often, from the results of one or more CAPWAP (Case pile wave analysis program) analyses. A computer program has been developed to estimate the bearing capacity of piles using the dynamic test results produced by the PDA. This program uses direct correlations between PDA data and CAPWAP results. It also includes an artificial intelligence module trained to predict CAPWAP pile capacity. It is not designed to replace the CAPWAP program, but rather to indicate when an additional CAPWAP analysis might be required. Key words : dynamic load test, computer program, artificial intelligence, CAPWAP, Case method.

scholarly journals ALTERNATIF UJI BEBAN PADA STRUKTUR (STUDI KASUS : JEMBATAN BAJA)

2021 ◽  
Vol 5 (1) ◽  
pp. 27
Author(s):  
Chairul Soleh ◽  
Josia Irwan Rastandi
Keyword(s):  
Natural Frequency ◽  
Dynamic Load ◽  
Static Load ◽  
Natural Frequencies ◽  
Load Test ◽  
Vibration Test ◽  
Steel Bridge ◽  
Bridge Structure ◽  
Static Load Test ◽  
Dynamic Load Test

The most common structural load test that has been widely used is the static load test. An alternative to the structural load test is dynamic load test. Dynamic testing is a test carried out to determine level of structural stiffness or structural elements stiffness in the form of natural frequencies, while the static load test is intended to obtain responses of static loading from the structure in the form of deflection. The discussion will emphasize the correlation between static load test and dynamic load test. To correlate the static load test with the vibration test, a reference or value that comes from modeling or theoretical analysis is needed. Structural modeling is carried out to obtain the theoretical natural frequency and the theoretical deflection which will then be compared with the natural frequency of the vibration test (dynamic). If the frequency of the test results and the theoretical frequency are compared to the theoretical deflection, the prediction of the test deflection will be obtained. The correlation between the predicted deflection of the test and deflection of the static load test is quite close with a difference of less than 12%. Judging from the above correlation, periodic inspections of the tested structures can be considered for vibration testing only. The types of structures reviewed are simple span steel bridge structure, simple span + link slab steel bridge structure and continuous span steel bridge structure. Keywords: modeling; natural frequencies; vibration testing; static load test  AbstrakUji beban struktur yang umum dan sudah banyak dilakukan adalah uji beban statik. Alternatif lain dari uji beban adalah dengan melakukan pengujian vibrasi (dinamik) pada struktur. Pengujian vibrasi (dinamik) dilakukan untuk mengetahui tingkat kekakuan struktur atau elemen struktur berupa frekuensi alami, sedangkan uji beban statik dimaksudkan untuk mendapatkan respons hasil pembebanan statik dari struktur berupa lendutan. Pembahasan akan menekankan kepada korelasi antara uji beban statik dan uji beban vibrasi (dinamik). Untuk mengkorelasikan pengujian beban statik terhadap pengujian vibrasi (dinamik) diperlukan suatu acuan atau nilai yang berasal dari analisa pemodelan atau teoritis. Pemodelan struktur dilakukan untuk mendapatkan frekuensi alami secara teoritis dan lendutan teoritis yang kemudian akan dibandingkan dengan frekuensi alami hasil uji vibrasi (dinamik).  Jika frekuensi hasil uji dan frekuensi teoritis dibandingkan terhadap lendutan teoritis maka akan didapatkan prediksi lendutan uji. Hasil korelasi antara prediksi lendutan uji terhadap lendutan uji beban statik cukup mendekati dengan perbedaan kurang dari 12%. Dilihat dari korelasi diatas, maka untuk pemeriksaan berkala pada struktur yang telah diuji dapat dipertimbangkan untuk dilakukan pengujian vibrasi saja. Jenis struktur yang ditinjau adalah struktur jembatan baja simple span, simple span + link slab dan continuous span.

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