Evaluation of Basic Driving Characteristics and Implementation of Redundant Speed Limiting Function of a Double-Motor Driving System

2011 ◽  
Vol 23 (3) ◽  
pp. 408-415 ◽  
Author(s):  
Eri Watai ◽  
◽  
Seonghee Jeong
Keyword(s):  
Rotational Speed ◽  
Static Friction ◽  
Sensor System ◽  
Motor Torque ◽  
Driving System ◽  
Offset Voltage ◽  
Safety Function ◽  
Related Part ◽  
Actuator System ◽  
The Relationship

The final goal of this paper is to develop an actuator system with high safety and driving performance using a double-motor driving method. In order to realize the goal, firstly, the driving characteristics of the driving method is identified through several experiments. As a result of the experiments, it was clarified that the relationship between rotational speed and torque of the driving method becomes linear in case of a small offset voltage. In addition, it was verified that the motor torque generated by an offset voltage should be larger than the static friction of a gear reducer in order to reduce a backlash on the output shaft. A Safety Related Part (SRP) for the driving system is implemented to avoid an over speed. The SRP consists of two-channel safety parts capable of executing safety function to cut-off power to motors independently. Through several experiments, it was confirmed that the safety function was well conducted in case of a single failure of a sensor system.

scholarly journals Sensors in the Autoclave-Modelling and Implementation of the IoT Steam Sterilization Procedure Counter

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 510
Author(s):  
Lukas Boehler ◽  
Mateusz Daniol ◽  
Ryszard Sroka ◽  
Dominik Osinski ◽  
Anton Keller
Keyword(s):  
The Body ◽  
Surgical Instruments ◽  
Sensor System ◽  
Temperature Profiles ◽  
Measured Temperature ◽  
Steam Sterilization ◽  
Automated Evaluation ◽  
Normative Requirements ◽  
Thermal Simulations ◽  
The Relationship

Surgical procedures involve major risks, as pathogens can enter the body unhindered. To prevent this, most surgical instruments and implants are sterilized. However, ensuring that this process is carried out safely and according to the normative requirements is not a trivial task. This study aims to develop a sensor system that can automatically detect successful steam sterilization on the basis of the measured temperature profiles. This can be achieved only when the relationship between the temperature on the surface of the tool and the temperature at the measurement point inside the tool is known. To find this relationship, the thermodynamic model of the system has been developed. Simulated results of thermal simulations were compared with the acquired temperature profiles to verify the correctness of the model. Simulated temperature profiles are in accordance with the measured temperature profiles, thus the developed model can be used in the process of further development of the system as well as for the development of algorithms for automated evaluation of the sterilization process. Although the developed sensor system proved that the detection of sterilization cycles can be automated, further studies that address the possibility of optimization of the system in terms of geometrical dimensions, used materials, and processing algorithms will be of significant importance for the potential commercialization of the presented solution.

The Markowitz Wobble

2000 ◽  
Vol 178 ◽  
pp. 351-354 ◽  
Author(s):  
A. Poma
Keyword(s):  
Rotational Speed ◽  
Local Effects ◽  
The Relationship ◽  
Long Term Variations

AbstractSeveral decades ago Markowitz was the first to report the existence of fluctuations in the motion of the Earth’s axis with a period of about twenty-four years. This empirical term was often considered not real but only an artifact due to local effects. In this paper long-term variations and the relationship between the 30-yr Markowitz wobble and changes in the Earth’s rotational speed are briefly discussed.

scholarly journals PLC-Based Safety Instrumented System of a Boiler using HAZOP

2018 ◽  
Vol 3 (1) ◽  
pp. 1-9
Author(s):  
Mahfoud CHAFAI ◽  
Abderrahmane OUADI ◽  
Hamid BENTARZI
Keyword(s):  
Control System ◽  
Pressure Sensors ◽  
Petrochemical Plant ◽  
Input Interface ◽  
Safety Function ◽  
Related Part ◽  
Operational Safety ◽  
Output Module ◽  
Machine Control ◽  
Interface Modules

HAZOP Analysis is used to determine great deviations which will affect the operational safety of a boiler of an existing petrochemical plant that may affect on persons, material and the environment. PLC is proposed to provide the safety function to fit into the overall machine control system as a safety-related part. It reads from the temperature, pressure sensors via its input interface modules and outputs commands in the case of critical deviation via the output module to the final control elements such as actuators allowing an improvement in the safety of the overall boiler system.

scholarly journals Tool Wear Prediction in Single-Sided Lapping Process

Machines ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 59
Author(s):  
Norbert Piotrowski
Keyword(s):  
Quality Control ◽  
Tool Wear ◽  
Product Quality ◽  
Computer Model ◽  
Rotational Speed ◽  
Data Driven ◽  
Product Quality Control ◽  
Abrasive Grains ◽  
Tool Wear Prediction ◽  
The Relationship

Single-sided lapping is one of the most effective planarization technologies. The process has relatively complex kinematics and it is determined by a number of inputs parameters. It has been noted that prediction of the tool wear during the process is critical for product quality control. To determine the profile wear of the lapping plate, a computer model which simulates abrasive grains trajectories was developed in MATLAB. Moreover, a data-driven technique was investigated to indicate the relationship between the tool wear uniformity and lapping parameters such as the position of conditioning rings and rotational speed of the lapping plate and conditioning rings.

Effects of Belt Flexural Rigidity on the Transmission Error of a Carriage-driving System

2000 ◽  
Vol 122 (2) ◽  
pp. 213-218 ◽  
Author(s):  
Hung-Ming Tai ◽  
Cheng-Kuo Sung
Keyword(s):  
Boundary Conditions ◽  
Numerical Method ◽  
Experimental Technique ◽  
Moving Boundary ◽  
Flexural Rigidity ◽  
Three Dimensional ◽  
Transmission Error ◽  
Beam Model ◽  
Driving System ◽  
The Relationship

This paper investigates the effects of belt flexural rigidity and belt tension on transmission error of a carriage-driving system. The beam model associated with both the clamped and moving boundary conditions at two ends is utilized to derive the governing equation of the belt. The belt flexural rigidity is obtained and verified by an experimental technique. In addition, a numerical method is proposed to determine the belt profile, transmission error and transmission stiffness. Results show that transmission error of a carriage-driving system increases when the carriage moves away from the driving pulley due to finite belt flexural rigidity. According to the analyses, application of appropriate tension on the belt can significantly reduce the error. Furthermore, the transmission stiffness for representing the entire rigidity between the carriage and pulley is investigated based on the proposed beam model. A three-dimensional plot that indicates the relationship among the transmission stiffness, belt tension and the position of the carriage is obtained. [S1050-0472(00)01102-8]

Research on Transmission Efficiency of Cycloid Cam Speed Reducer

2011 ◽  
Vol 138-139 ◽  
pp. 310-314
Author(s):  
Jun Kai Yang ◽  
Yun Jie Xu
Keyword(s):  
Rotational Speed ◽  
Influence Factors ◽  
Dynamic Measurement ◽  
Transmission Efficiency ◽  
Working Process ◽  
Load Change ◽  
Speed Reducer ◽  
The Relationship

Cycloid cam speed reducer is a widely used transmission. In practice, there are many kinds influence factors which affect transmission efficiency of cycloid cam speed reducer. In this research, dynamic measurement of the transmission efficiency has carried out by experiment It mainly studies the relationship between speed, load change and transmission efficiency during cycloid cam speed reducer working process. Experiment results show that transmission efficiency of cycloid cam speed reducer could be improved by increasing the load, other methods can also use such as reducing the input rotational speed.

Calculation Methods of Orienter Torque and Drag in Coiled Tubing Drilling

2014 ◽  
Vol 1065-1069 ◽  
pp. 2049-2052
Author(s):  
Liang Hu ◽  
De Li Gao
Keyword(s):  
Static Friction ◽  
Maximum Output ◽  
Force Analysis ◽  
Viscous Forces ◽  
Coiled Tubing ◽  
Bottom Hole ◽  
Weight On Bit ◽  
Bottom Hole Assembly ◽  
The Impact ◽  
The Relationship

Hydraulic orienter has been widely used to alter the drilling direction downhole in coiled tubing drilling. A problem is encountered in construction field. When torque and drag of bottom hole assembly (BHA) are over the maximum output torque of orienter, This caused that it difficult to orient. Therefore, we need to calculate the maximum torque and drag in the process of orientation, it can provide a theoretical basis for designing and selecting the hydraulic orienter. Compared with the conventional force analysis, this paper additionally considered the case of zero weight on bit (WOB), the impact of the mud viscous forces and the relationship between dynamic and static friction, so that we can get more precise result of force analysis.

Rotating Choke in Cavitating Turbopump Inducer

2004 ◽  
Vol 126 (1) ◽  
pp. 87-93 ◽  
Author(s):  
Yury A. Semenov ◽  
Akira Fujii ◽  
Yoshinobu Tsujimoto
Keyword(s):  
Rotational Speed ◽  
Development Stage ◽  
Liquid Hydrogen ◽  
Cavity Model ◽  
Cavitation Instability ◽  
New Type ◽  
Main Engine ◽  
The Relationship

During the development stage of the liquid hydrogen turbopump for the main engine LE-7A of the H-IIA rocket, a new type of cavitation instability was observed. This instability occurs at lower cavitation numbers where the head of the inducer starts to decrease due to choke. The disturbance rotates around the rotor at about 50% of the inducer rotational speed. So, it is called “rotating choke.” In order to predict the instability, a cavity model with a cavity wake is developed. The region of instability and the frequency predicted by the model are in agreement with experiment. Discussions are made as to the relationship between rotating choke and rotating cavitation.

Investigation of Delamination at Exit of Drilled Carbon Fiber Reinforced Polymer (CFRP) Composite with Diamond Coated Ball Nose Drills

2015 ◽  
Vol 1115 ◽  
pp. 80-85
Author(s):  
Mohamed Konneh ◽  
Kassim A. Abdullah ◽  
Sudin Izman ◽  
Mohd Amirudin Jusoh
Keyword(s):  
Feed Rate ◽  
Rotational Speed ◽  
Cutting Parameters ◽  
Influential Factor ◽  
Fiber Reinforced Polymer ◽  
Machining Parameters ◽  
Reinforced Polymer ◽  
Delamination Factor ◽  
Cfrp Composite ◽  
The Relationship

: The investigation of the influence of machining parameters on delamination at exit of drilled holes after drilling into CFRP composite using 4 mm-diameter 2-fluted carbide drills coated diamond is present in this paper. The delamination at tool exit was analyzed in terms of delamination factor on the basis of analysis of variance (ANOVA) of Central Composite Design (CCD) of experiments. It is found that spindle speed is the most influential factor for the drilling of CFRP within the range of cutting parameters examined. The lowest delamination factor (1.003) was generated at rotational speed, 5063 rpm and feed rate, 180 mm/min; and the highest delamination factor (1.093) generated at rotational speed, 537 rpm and feed rate, 180 mm/min. A mathematical model has been predicted for the delamination at tool entry. The relationship between the machining variables and output variables is also established.

scholarly journals Scaling data PLC sebagai pengontrol motor stepper penggerak ulir extruder

JURNAL ELTEK ◽  
2021 ◽  
Vol 19 (2) ◽  
pp. 80
Author(s):  
Muhamad Rifa’i ◽  
Herwandi . ◽  
Hari Kurnia Safitri ◽  
Abrar Kadafi
Keyword(s):  
Rotational Speed ◽  
Extrusion Process ◽  
Stepper Motor ◽  
Test Results ◽  
Motor Torque ◽  
Data Scaling ◽  
Simulation Testing ◽  
Mathematical Equations ◽  
Is Design ◽  
Speed Method

Scaling data PLC untuk penggerak motor stepper pada sistem extruder memengaruhi bentuk produk yang dihasilkan saat proses ekstrusi melalui kecepatan putar dan torsi motor. Produk hasil cetakan akan gagal jika kecepatan putar motor stepper terlalu cepat atau lambat karena pengaruh torsi motor yang bekerja. Dibutuhkan pembatasan kecepatan putar motor stepper menjadi beraturan untuk menghindari kegagalan proses ekstrusi. Tujuan penelitian ini adalah mendesain scaling setpoint dan kecepatan putar motor (rpm) beserta torsi motor (Nm) untuk kontrol torsi motor melalui kecepatan putar motor stepper. Metode yang digunakan adalah eksperimen kuantitatif data scaling dengan menggunakan persamaan matematis scaling setpoint, kecepatan putar motor (rpm) dan torsi motor (Nm). Data hasil didapatkan melalui pengujian simulasi persamaan matematis scaling pada PLC dengan sampel input periode pulsa setpoint antara 100us sampai 1000us. Hasil pengujian dengan daya motor 24Watt menunjukkan kecepatan putar motor stepper antara 49,3rpm sampai 9,4rpm berbanding terbalik dengan torsi motor stepper antara 0,49Nm sampai 2,55Nm. Pada setpoint 800us didapatkan hasil scaling setpoint 820us nilai error sebesar 2,5%, cukup ideal diaplikasikan dengan kecepatan putar 11,4rpm serta torsi 2,1Nm untuk menjalankan extruder dimensi kecil.   PLC data scaling for stepper motor drive in extruder system affects the shape of product produced during extrusion process through motor rotational speed and torque. Printed product will fail if  rotational speed of stepper motor is too fast or slow due the working torque influence of the motor. It is necessary to limit rotational speed of stepper motor to be regular to avoid failure of extrusion process. The purpose of this research is design scaling setpoint and motor rotational speed (rpm) along with motor torque (Nm) to control motor torque through stepper motor rotational speed. Method used is quantitative experimental data scaling using mathematical equations of scaling setpoint, motor rotational speed (rpm) and motor torque (Nm). Result data is obtained by simulation testing the scaling mathematical equation on PLC with input samples of the setpoint pulse period between 100us to 1000us. Test results with 24Watt motor power show that stepper motor rotational speed is between 49.3rpm to 9.4rpm and inversely proportional to stepper motor torque between 0.49Nm until 2.55Nm. At 800us setpoint, the 820us setpoint scaling results in error value of 2.5%, which is ideal for application with rotational speed of 11.4rpm and torque of 2.1Nm to run small-dimensional extruder.

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