scholarly journals Development of a 125% Load Brake Test Instrument for Elevator

2021 ◽  
Vol 2113 (1) ◽  
pp. 012035
Author(s):  
Pengzhao Zhang ◽  
Shuangchang Feng ◽  
Liang Fang ◽  
Shengjie Liu
Keyword(s):  
National Standards ◽  
Test Results ◽  
Braking Performance ◽  
Test Instrument

Abstract In order to solve the problem of elevator braking test inspection, this paper combs the requirements of relevant national standards and inspection rules on braking performance, and develops an elevator braking test inspection instrument. With the help of the instrument, the elevator braking effect can be expressed quantitatively, and the inspectors can conveniently judge whether the braking test results meet the requirements of elevator inspection rules remotely. A way to standardize and rationalize the test is given. In order to solve the problem of elevator brake test inspection, this paper sorted out the national standards and inspection rules on braking performance, and developed an instrument of elevator brake test inspection. With the help of the instrument, we could quantitatively give the expression on the elevator braking effect, and the inspectors can conveniently judge whether the braking test results meet the requirements of the elevator inspection rules in the remote.

scholarly journals Car braking effectiveness after adaptation for drivers with motor dysfunctions

2021 ◽  
Vol 11 (1) ◽  
pp. 617-623
Author(s):  
Adam Sowiński ◽  
Tomasz Szczepański ◽  
Grzegorz Koralewski
Keyword(s):  
Efficiency Index ◽  
Mathematical Function ◽  
Test Results ◽  
Braking Performance ◽  
Braking System ◽  
System Adaptation ◽  
Parametric Description ◽  
Limited Power ◽  
Braking Force ◽  
Selection Of

Abstract This article presents the results of measurements of the braking efficiency of vehicles adapted to be operated by drivers with motor dysfunctions. In such cars, the braking system is extended with an adaptive device that allows braking with the upper limb. This device applies pressure to the original brake in the car. The braking force and thus its efficiency depend on the mechanical ratio in the adapting device. In addition, braking performance depends on the sensitivity of the car’s original braking system and the maximum force that a disabled person can exert on the handbrake lever. Such a person may have limited power in the upper limbs. The force exerted by the driver can also be influenced by the position of the driver’s seat in relation to the handbrake lever. This article describes the research aimed at understanding the influence of the above-mentioned factors on the car braking performance. As a part of the analysis of the test results, a mathematical function was proposed that allows a parametric description of the braking efficiency index on the basis of data on the braking system, adaptation device, driver’s motor limitations, and the position of the driver’s seat. The information presented in this article can be used for the preliminary selection of adaptive devices to the needs of a given driver with a disability and to the vehicle construction.

Design of combined brake system for light weight scooters

2021 ◽  
pp. 095440702110240
Author(s):  
Yuan-Ting Lin ◽  
Chyuan-Yow Tseng ◽  
Jao-Hwa Kuang ◽  
Yeong-Maw Hwang
Keyword(s):  
Ride Comfort ◽  
Brake System ◽  
Force Distribution ◽  
Test Results ◽  
Systematic Method ◽  
Braking Performance ◽  
Evaluation Indexes ◽  
Low Costs ◽  
Braking Force ◽  
Good Agreement

The combined brake system (CBS) is a mechanism that links the front and rear brakes for scooters. For two-wheeled scooters, a CBS with appropriate braking force distribution can reduce the risk of crashing accidents due to insufficient driving proficiency. The design of the braking force distribution for a CBS is challenging to the designer because it has to fulfill many requirements such as braking performance, ride comfort, reliability, and low costs. This paper proposes a systematic method to optimize the parameters of CBS. The evaluation indexes for the design are first discussed. The steps to determine the critical parameter to meet the indexes and a method to predict braking performance are developed. Finally, driving tests are carried out to verify the effectiveness of the proposed method. Experimental results showed that the deceleration of the tested scooter equipped with the designed CBS achieves an average mean fully developed deceleration (MFDD) of 5.246 m/s2, higher than the homologation requirement. Furthermore, the proposed method’s prediction of braking performance is in good agreement with the test results, with errors <1%.

scholarly journals Analysis and Calculation of Stability Coefficients of Cross-Laminated Timber Axial Compression Member

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4267
Author(s):  
Qi Ye ◽  
Yingchun Gong ◽  
Haiqing Ren ◽  
Cheng Guan ◽  
Guofang Wu ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Axial Compression ◽  
Calculation Method ◽  
National Standards ◽  
Test Results ◽  
Average Deviation ◽  
Stability Coefficient ◽  
Cross Laminated Timber ◽  
Stability Bearing Capacity ◽  
The Stability

Cross-laminated timber (CLT) elements are becoming increasingly popular in multi-storey timber-based structures, which have long been built in many different countries. Various challenges are connected with constructions of this type. One such challenge is that of stabilizing the structure against vertical loads. However, the calculations of the stability bearing capacity of the CLT members in axial compression in the structural design remains unsolved in China. This study aims to determine the stability bearing capacity of the CLT members in axial compression and to propose the calculation method of the stability coefficient. First, the stability coefficient calculation theories in different national standards were analyzed, and then the stability bearing capacity of CLT elements with four slenderness ratios was investigated. Finally, based on the stability coefficient calculation formulae in the GB 50005-2017 standard and the regression method, the calculation method of the stability coefficient for CLT elements was proposed, and the values of the material parameters were determined. The result shows that the average deviation between fitting curve and calculated results of European and American standard is 5.43% and 3.73%, respectively, and the average deviation between the fitting curve and the actual test results was 8.15%. The stability coefficients calculation formulae could be used to predict the stability coefficients of CLT specimens with different slenderness ratios well.

scholarly journals An Overview of Heavy Trucks/Buses Braking Performance

1991 ◽  
Vol 8 (1) ◽  
Author(s):  
Richard M. Ziernicki
Keyword(s):  
Statistical Data ◽  
Vehicle Speed ◽  
Test Results ◽  
Heavy Duty ◽  
Braking Performance ◽  
Emergency Braking ◽  
Heavy Trucks ◽  
Brake Performance ◽  
Drag Factor ◽  
Heavy Duty Vehicles

The writer discusses the performance of heavy duty vehicles during emergency braking. The paper reviews statistical data related to the trucking accidents, and discusses brake performance, tires, and the stopping ability of heavy duty vehicles. Relationships between drag factor, coefficient of friction, vehicle speed, type of tire, road surface, brake design, and brake temperature are discussed. Some of the test results performed on heavy trucks are presented. The discussion is general in order to make the presentation useful both to practicing reconstruction specialists, and to attorneys.

scholarly journals Development and Testing of a Collision Avoidance Braking System for an Autonomous Vehicle

2019 ◽  
Vol 8 (12) ◽  
pp. 703-709
Keyword(s):  
Autonomous Vehicle ◽  
Test Results ◽  
Correct Operation ◽  
Braking Performance ◽  
System Parameters ◽  
Emergency Braking ◽  
Braking System ◽  
Good Consistency ◽  
Main Development ◽  
Outdoor Experiments

The article describes the main development and testing aspects of an emergency braking function for an autonomous vehicle. The purpose of this function is to prevent the vehicle from collisions with obstacles, either stationary or moving. An algorithm is proposed to calculate deceleration for the automated braking, which takes into account the distance to the obstacle and velocities of both the vehicle and the obstacle. In addition, the algorithm adapts to deviations from the required deceleration, which are inevitable in the real-world practice due to external and internal disturbances and unaccounted dynamics of the vehicle and its systems. The algorithm was implemented as a part of the vehicle’s mathematical model. Simulations were conducted, which allowed to verify algorithm’s operability and tentatively select the system parameters providing satisfactory braking performance of the vehicle. The braking function elaborated by means of modeling then was connected to the solenoid braking controller of the experimental autonomous vehicle using a real-time prototyping technology. In order to estimate operability and calibrate parameters of the function, outdoor experiments were conducted at a test track. A good consistency was observed between the test results and simulation results. The test results have proven correct operation of the emergency braking function, acceptable braking performance of the vehicle provided by this function, and its capability of preventing collisions.

Design, testing and analysis of a novel automotive magnetorheological braking system

2016 ◽  
Vol 231 (10) ◽  
pp. 1402-1413 ◽  
Author(s):  
Liangyao Yu ◽  
Liangxu Ma ◽  
Jian Song
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Reaction Times ◽  
Test Results ◽  
Element Analysis ◽  
Braking Performance ◽  
Braking System ◽  
Magnetic Circuits ◽  
Torque Capacity ◽  
Intensity Magnetic Field

This paper presents a new approach to the design, testing and analysis of a magnetorheological brake which uses a multi-path magnetic circuit to satisfy the braking demand of vehicles. In contrast with a general braking system, an automotive brake exhibits an outstanding performance for high torques and long reaction times. We use a proposed power-law model and finite element analysis to obtain the magnetorheological braking performance for a high shear rate and a high-intensity magnetic field. Finite element analysis with different structures is adopted to determine the parameters of the magnetorheological braking and the layout of the magnetic circuits. An integrated prototype is also fabricated and tested. The test results show that the brake torque is relatively high, and the torque can be accurately controlled by the input current. The reaction time is less than 100 ms. We also analyse the experimental results and use these as the basis for fabricating a full-sized prototype. The full-sized prototype generally exhibits a high torque capacity and a fast dynamic response, thereby validating the feasible application of magnetorheological fluids in automotive braking.

scholarly journals ON THE PREDICTION OF NON‐LINEAR CREEP STRAINS

2010 ◽  
Vol 16 (3) ◽  
pp. 382-386 ◽  
Author(s):  
Robertas Balevičius ◽  
Eugedijus Dulinskas
Keyword(s):  
National Standards ◽  
Test Results ◽  
The European Union ◽  
Short Term ◽  
Main Design ◽  
Design Specifications ◽  
Linear Creep ◽  
Non Linear ◽  
Structural Engineers ◽  
Creep Strains

In the short term, the Euorocode‐based techniques will be implemented as the main design specifications for structural engineers from the member‐states of the European Union instead of the national standards. Therefore, it is of primary importance draw attention to the observed inaccuracies, particularly, in predicting non‐linear creep strains according to EC‐2. The analysis performed was mainly focused on an inconsistency elimination observed in the original EC‐2 approach, when transition from the linear to non‐linear creep laws for a constant compressive stress is required. A recent CEN corrigendum eliminating the observed inconsistency was also discussed in detail. In this context, similar techniques which were reported in the literature for predicting the creep non‐linearity function were analysed to account for the results obtained. It was particularly demonstrated that the recent CEN amendment results in an extremely enhanced creep strain for low strength concrete. A comparison of the creep non‐linearity functions with experimental test results was also considered. Santrauka Artimiausiu metu nacionalines normas pakeis Europos normos, kurios taps privalomu normatyviniu dokumentu Europos Sajungos šaliu statybos inžinieriams. Todel labai svarbu konstatuoti ir patikslinti jose pastebetus netikslumus. Straipsnyje akcentuojamas normu EC2 metodikoje pastebetas valkšnumo deformaciju nesutapimas, kai reikalingas perejimas iš tiesiniu valkšnumo deformaciju prie netiesiniu. Pateikiama žinomu metodu ir eksperimentiniu tyrimu rezultatu lyginamoji analize, autoriu siūlymai bei detaliai nagrinejamas neseniai išleistas CEN komiteto taisymas. Atlikus analize nustatyta, kad CEN korektūra lemia nepaprastai dideles mažo stiprumo betonu netiesinio valkšnumo deformacijas.

The Study of Anti-UV and Anti-Solarization of Strength Synthetic Fiber

2012 ◽  
Vol 573-574 ◽  
pp. 1224-1229
Author(s):  
Hai Yan Ni ◽  
Ying Jin Gan ◽  
Jin Ti You
Keyword(s):  
Fiber Bundle ◽  
Performance Test ◽  
High Strength ◽  
Uv Protection ◽  
National Standards ◽  
Synthetic Fiber ◽  
Test Results ◽  
Before And After ◽  
The Difference ◽  
Better Than

In view of anti-UV of the high strength synthetic fiber hoisting belt, the researcher compared the effects on anti-ultraviolet of SCJ-966 and HTUV100,through before and after intensity test and the test of Anti-solarization performance,then comparing with tests of fiber bundle strength,the reacher analyzed the effect of anti-UV and the difference on intensity.The result shows that:two UV performance are very good, far more than the European and national standards,and the webbing performance test results show that the UV protection of SCJ-966 UV protection is better than HTUV100, but the intensity rate is the former smaller than the latter, the extent damage of hoisting belt is the latter worse than the former.

scholarly journals Peningkatan Kompetensi Strategis Siswa Melalui Model Pembelajaran Conceptual Understanding Procedures

2020 ◽  
Vol 2 (1) ◽  
pp. 01
Author(s):  
Adriyanto Adriyanto ◽  
Dewi Pramita ◽  
Abdillah Abdillah ◽  
Syaharuddin Syaharuddin ◽  
Mahsup Mahsup ◽  
...  
Keyword(s):  
Data Analysis ◽  
Conceptual Understanding ◽  
Design Research ◽  
Learning Model ◽  
Sampling Techniques ◽  
Test Results ◽  
Test Instrument ◽  
Post Test ◽  
Quasi Experimental ◽  
Data Collection Technique

Abstract: This study aims to determine the effectiveness of conceptual understanding procedures learning model to students' strategic competencies taken from student post-test results. The study was included in quasi Experimental Design research involving 41 students consisting of two classes taken from five classes with porposive sampling techniques. The data collection technique used is a test instrument with a significant level of 5%. The results showed that the average strategic competency ability of experimental class students was 61.7, while the average strategic competency ability of control class students was 51. Based on data analysis from the t-test hypothesis that has been done, the results showed t-count > t-table (2.43 > 1.69) so that Ho was rejected and Ha accepted. Therefore, it can be concluded that the Conceptual Understanding Procedures learning model is effective against the strategic competencies of students in the material of building flat-sided rooms in grade VIII junior high school.Abstrak: Penelitian ini bertujuan untuk mengetahui efektifitas model pembelajaran Conceptual Understanding Procedures terhadap kompetensi strategis siswa yang diambil dari hasil post-test siswa. Penelitian ini termasuk dalam penelitian Quasi Eksperimental Design yang melibatkan 41 siswa yang terdiri dari dua kelas yang diambil dari lima kelas dengan teknik porposive sampling. Teknik pengumpulan data yang digunakan adalah instrumen tes dengan taraf signifikan 5%. Hasil penelitian menunjukkan, rata-rata kemampuan kompetensi strategis siswa kelas eksperimen sebesar 61,7, sedangkan rata-rata kemampuan kompetensi strategis siswa kelas kontrol sebesar 51. Berdasarkan analisis data dari uji hipotesis uji-t yang sudah dilakukan, hasilnya menunjukkan t-hitung > t-tabel (2,43 > 1,69) sehingga Ho ditolak dan Ha diterima. Oleh sebab itu, dapat disimpulkan bahwa model pembelajaran Conceptual Understanding Procedures efektif terhadap kompetensi strategis siswa pada materi bangun ruang sisi datar kelas VIII SMP.

scholarly journals ANALISIS MISKONSEPSI MAHASISWA PGSD DENGAN METODE CERTAINTY OF RESPONSE INDEX (CRI) MELALUI FITUR QUIS EDMODO

2020 ◽  
Vol 5 (2) ◽  
pp. 680-688
Author(s):  
Tri Wiyoko ◽  
Puput Wahyu Hidayat
Keyword(s):  
Conceptual Understanding ◽  
Test Results ◽  
Study Program ◽  
Response Index ◽  
Test Instrument ◽  
Student Misconceptions ◽  
Evaluation Test ◽  
Scientific Attitudes ◽  
Academic Year ◽  
Student Misconception

The problem of this research is the finding of wrong conceptual understanding by students on vibration and wave material. Wrong understanding of the concept results in misconceptions in cognitive aspects, scientific attitudes and student skills. This study aims to analyze student misconceptions with the Certainty Of Response Index (CRI) model through the edmodo quis feature. The subjects of this research were students of the PGSD STKIP MB Study Program for the 2019/2020 Academic Year. This type of research is qualitative research using descriptive methods. Furthermore, the research instrument used an objective test instrument. The results of this study are in the form of evaluation test kits that have been validated from the aspects of the content of the material and language by the experts. The results of the validation of the material content aspect were 93.75% in the very good category, the question construction aspect was 96.42% in the very good category and the language aspect was 90.6% with the very good category. This shows that the question has the feasibility of being applied. The test results showed that the misconceptions experienced by students regarding the wave material were very diverse. The average student misconception on vibration and wave material was 23.17% with the low category.

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