scholarly journals RESEARCH OF LINEAR TRANSLATION DEVICES WITH STEPPER MOTOR / LINIJINIŲ POSLINKIŲ ĮTAISŲ SU ŽINGSNINIAIS VARIKLIAIS TYRIMAS

2016 ◽  
Vol 7 (6) ◽  
pp. 632-636
Author(s):  
Dmitrij Komissarov ◽  
Artūras Kilikevičius ◽  
Artur Piščalov
Keyword(s):  
Sound Level ◽  
Stepper Motor ◽  
Experimental Investigations ◽  
Vibration Level ◽  
Ration Level ◽  
Operating Modes ◽  
Movement Characteristics ◽  
Translation Stage ◽  
Moving Platform

In order to ensure accuracy of motorized linear translation stages theoretical and experimental investigations were performed, that allow to establish moving platform vibration level depending of operating modes (different velocities) and used lubricant in the system. Lubricants had different viscosity, which has effect to the system moving smoothness, sound level and vibration level of the stage. Such work gives possibility to done conclusions: with what lubricant or with what viscosity of the lubricant motorized linear translation stage works smoother, with less noise and vib-ration level, and also show best movement characteristics. Siekiant užtikrinti linijinių poslinkių įtaisų tikslumą, buvo atlikti linijinio poslinkio įtaiso su žingsniniu varikliu teoriniai ir eksperimentiniai dinamikos tyrimai. Buvo nustatytas judamosios platformos virpesių lygis priklausomai nuo darbo režimų (skirtingų greičių) ir mazge naudojamo tepalo. Tepalai skiriasi savo klampumu. Šis parametras turi įtakos įtaiso judėjimo sklandumui ir virpesių lygiui mazge.

Measurement of Noise inside the Compartment and Vibration on both Sides of Elastomeric Powertrain Mounts of Passenger Car

2013 ◽  
Vol 471 ◽  
pp. 59-63
Author(s):  
Mohd Noor Arib Rejab ◽  
Roslan Abd Rahman ◽  
Raja Ishak Raja Hamzah ◽  
Jawaid Iqbal Inayat Hussain ◽  
Nazirah Ahmad ◽  
...  
Keyword(s):  
Fast Response ◽  
Sound Level ◽  
Measurement Noise ◽  
The Other ◽  
Vibration Level ◽  
Test Conditions ◽  
Exhaust Noise ◽  
Run Up ◽  
Level Meter ◽  
High Level

This paper presents an evaluation on elastomeric mount used to isolate vibration from powertrain to chassis or structure vehicle. The assessments started with measurement of noise inside compartment, and exhaust noise. This is followed by the measurement of vibration on both sides of elastomeric mounts. The noise in the compartment and exhaust noise is measured according to BS 6086: 1981 and BS ISO 5130: 2007. The noise in the compartment and vibration is tested in three conditions. Firstly, engine is run-up with load (driving at second gear); secondly, without load; and thirdly, without load but hanging. A microphone is fixed at the ear of the mannequin. The fast response and A weighting sound level meter were used for measurement noise in the compartment and exhaust noise. The vibration is measured in terms of acceleration on both sides of each elastomeric powertrain mounts. Two accelerometer transducers are fixed on both sides of powertrain elastomeric mounts. One side was identified as a source of vibration and the other as receiver of vibrations. The results showed that the pattern of overall vibration level on source and receiver increased from 1050 RPM (idling) to 4000 RPM on all test conditions. Vibration transmitted to chassis or receiver structure was analyzed using transmissibility concept. By evaluating test condition of engine run-up without load, informed that the front and rear mounts showed a high level transmissibility contributing to structure-borne noise.

scholarly journals Development automated capture device for picking apples

2021 ◽  
Vol 285 ◽  
pp. 07025
Author(s):  
Dmitriy Khort ◽  
Alexey Kutyrev ◽  
Igor Smirnov ◽  
Daniil Pupin
Keyword(s):  
Final Stage ◽  
Maximum Size ◽  
Stepper Motor ◽  
Fruit Crops ◽  
Maximum Weight ◽  
Operating Modes ◽  
Minimal Damage ◽  
Series Of Experiments

In the system of the mechanized process of cultivation of fruit crops, harvesting is an important final stage, which requires the development of new, convenient, including those that do not damage the fruit, automated technical devices. As a result of a series of experiments, the operability of the developed automated fruit picking device was confirmed, it gently captures the fruit and reliably holds it. The operating modes of the automated device for picking fruits have been established. The following characteristics of the device for picking fruits were revealed: the time for a complete capture of the apple is from 1.5 seconds to 2 seconds, depending on their size, the maximum size of the captured apple is 85x80 mm, the maximum weight of the captured apple is 400 g. The permissible pressure of the paws of the device on the fruit is determined ... It was found that with the force of the linear stepper motor on the pusher in 8N, the safety of the apple is ensured with minimal damage, while the apple is securely fixed in the capture paws.

Hygienic Characteristics of the Acoustic Environment in the Mi-8 Helicopter Cabin

2021 ◽  
pp. 54-61
Author(s):  
VV Kharitonov
Keyword(s):  
Working Conditions ◽  
Sound Pressure ◽  
Bone Conduction ◽  
Central Compartment ◽  
Sound Level ◽  
Exposure Limits ◽  
Acoustic Environment ◽  
Operating Modes ◽  
Technical Requirements ◽  
Sound Pressure Levels

Introduction: The Mi-8 helicopter generates high-intensity broadband noises by its turboshaft engines whereas a comprehensive hygienic assessment of the acoustic environment in the helicopter cabin has not been conducted. The purpose of the study was to assess the acoustic environment in the Mi-8 helicopter cabin. Materials and methods: Acoustic measurements were carried out on the ground, inside the central cabin of the Mi-8 helicopter in three operating modes of the turboshaft engines: at startup, in the idle mode, and during cruise flight in the “right correction” mode. Measuring microphones were placed during the recording of the signal on a stand at the level of the human ear at six points located next to the reclining seats in the cabin. Acoustic indicators were measured using an SVAN-945A digital sound level meter and a GRAS 40AZ microphone. The collected data were processed in accordance with the requirements of sanitary and epidemiological rules, sanitary standards, and general tactical and technical requirements of the Air Force. Results: Values of regulated noise indicators at the seats of the Mi-8 helicopter crew, sound pressure levels of the most significant tonal frequencies in its central compartment were measured. To establish the presence of tonal noise, a one-third octave analysis of the recorded acoustic signals was carried out. In the central compartment of the helicopter, the values of the regulated infrasound indices and the general sound pressure level were measured in the entire regulated frequency range. Discussion: It was found that the sound pressure levels in almost all sound octaves and the equivalent sound level in all operating modes of the helicopter engines exceed the permissible exposure limits while in the infrasound region they are within the normal range (except for the frequency of 16 Hz). Thus, the class of working conditions by noise corresponds to hazard class 3.3, and by infrasound – to class 2. According to the sanitary regulations, helicopter crews should use noise suppressors to protect themselves from high noise exposures through air and bone conduction. Conclusion: The existing risks of developing a noise and infrasound-induced diseases necessitate constant monitoring of working conditions and health of the crews of Mi-8 helicopters.

scholarly journals Analysis of Vibration and Noise on Vibrating Screen at PT. Mifa Bersaudara

2021 ◽  
Vol 6 (2) ◽  
pp. 106-111
Author(s):  
Herdi Susanto ◽  
Kamarullah
Keyword(s):  
Health And Safety ◽  
Sound Level ◽  
Sound Level Meter ◽  
Measurement Point ◽  
Vibration Level ◽  
Vibrating Screen ◽  
Average Value ◽  
Level Meter ◽  
The Right ◽  
Maximum Limit

The purpose of this study was to analyze the level of vibration and noise on the Equipment Vibrating screen crusher FC 02 at PT. MIFA Bersaudara. Vibration is measured using a vibration meter, noise is measured by a digital sound level meter. Measurements are made on the x, y and z axes at each measurement point. The results showed that the value of the vibration level on the Vibrating screen crusher FC 02 on the x-axis with the velocity value of 28.56 mm/s, the y-axis value of 29.82 mm/s and the z-axis velocity value of 25.46 mm/s. While the Acceleration value on the x-axis is 20.7 m/s 2 the value is 30.86 m/s 2on the y and z axes of 21.42 m/s 2 . While the noise value indicates that the average value on the right side is 99.6 dBA on the right side and 101.7 dBA on the left side. Efforts were made to overcome the problem, namely by not operating the VSC FC 02 exceeding the recommended maximum limit of 60 dBA and the maximum allowed which is 70 dBA so as to prevent problems of comfort, health, and safety at work. Operators and employees are advised to stay at the location for no more than 15-30 minutes, if more than that time must use safety earmuffs.

A New Type of Parallel Robot Manipulator Kinematics Simulation and Analysis of Movement Characteristics

2009 ◽  
Vol 16-19 ◽  
pp. 1294-1298 ◽  
Author(s):  
Ji Man Luo ◽  
Li Na Cong ◽  
Tian Fang
Keyword(s):  
Robot Manipulator ◽  
Parallel Robot ◽  
One Dimension ◽  
Two Dimension ◽  
Working Space ◽  
Kinematics Simulation ◽  
Movement Characteristics ◽  
Wide Range ◽  
New Type ◽  
Moving Platform

Kinematics simulation and characteristics of a new type of parallel robot manipulator (PRM) with two-dimension movement and one-dimension rotation are analyzed. The new PRM is proved to can realize expected movement, and have smooth movement curves of displacement and velocity. The moving platform center of the PRM can achieve a wide range of swing, and has a larger working space. According to the kinematics theory, the working space and singularity characteristic are analyzed. Simulation and analysis indicated that the working space of the new PRM in the form and position is not singular, and has good maneuverability, thus providing the foundation for practice application and product exploitation.

scholarly journals The influence of selected static and dynamic parameters of resilient mats on vibration reduction of railway tracks

2018 ◽  
Vol 219 ◽  
pp. 05002
Author(s):  
Cezary Kraśkiewicz ◽  
Artur Zbiciak ◽  
Wojciech Oleksiewicz ◽  
Andrzej Piotrowski
Keyword(s):  
Insertion Loss ◽  
Vibration Reduction ◽  
Sound Level ◽  
Vibration Level ◽  
Dynamic Moduli ◽  
Laboratory Unit ◽  
Laboratory Methods ◽  
University Of Technology ◽  
Elastomeric Materials ◽  
Static And Dynamic Moduli

The paper presents laboratory methods of testing the prototype resilient mats, used in rail track systems in order to reduce vibrations transmitted to the vicinity of the railroad and to improve the resistance of the railroad structure. The laboratory testing program was carried out for elastomeric materials (polyurethane based). The key parameters being investigated in the Warsaw University of Technology laboratory unit were used in order to determine the insertion loss vibration level by applying analytical method. The paper presents the influence of selected parameters i.e. static and dynamic moduli on the reduction of vibration and structure-borne sound level – i.e. the value of insertion loss parameters.

scholarly journals Static and Dynamic Parameters of Railway Tracks Retrofitted With Under Sleeper Pads

2018 ◽  
Vol 64 (4) ◽  
pp. 187-201
Author(s):  
C. Kraśkiewicz ◽  
A. Zbiciak ◽  
W. Oleksiewicz ◽  
W. Karwowski
Keyword(s):  
Laboratory Testing ◽  
Laboratory Tests ◽  
Sound Level ◽  
Vibration Level ◽  
Dynamic Moduli ◽  
Laboratory Unit ◽  
Testing Program ◽  
University Of Technology ◽  
Elastomeric Materials ◽  
Static And Dynamic Moduli

Abstract The paper presents results of the laboratory tests made for the prototype resilient under sleeper pads in the Warsaw University of Technology laboratory unit. These pads are dedicated to reduce vibrations transmitted to the vicinity of the railroad and to improve the resistance of the railroad structure. The laboratory testing program was carried out for elastomeric materials (polyurethane and rubber based) due to the PN-EN 16730 standard. The obtained values of the key parameters were used in order to determine the insertion loss vibration level by applying analytical method. The paper presents the influence of selected parameters i.e. static and dynamic moduli on the reduction of vibration and structure-borne sound level.

Quantifying Vocal Power: Correlation of Whole-Body Anaerobic Power to Vocal Function Measures

2020 ◽  
Vol 63 (8) ◽  
pp. 2597-2608
Author(s):  
Emily N. Snell ◽  
Laura W. Plexico ◽  
Aurora J. Weaver ◽  
Mary J. Sandage
Keyword(s):  
Fundamental Frequency ◽  
Forced Vital Capacity ◽  
Vital Capacity ◽  
Anaerobic Power ◽  
Performance Outcomes ◽  
Sound Level ◽  
Whole Body ◽  
Vocal Function ◽  
Laryngeal Diadochokinesis ◽  
High Sound

Purpose The purpose of this preliminary study was to identify a vocal task that could be used as a clinical indicator of the vocal aptitude or vocal fitness required for vocally demanding occupations in a manner similar to that of the anaerobic power tests commonly used in exercise science. Performance outcomes for vocal tasks that require rapid acceleration and high force production may be useful as an indirect indicator of muscle fiber complement and bioenergetic fitness of the larynx, an organ that is difficult to study directly. Method Sixteen women (age range: 19–24 years, M age = 22 years) were consented for participation and completed the following performance measures: forced vital capacity, three adapted vocal function tasks, and the horizontal sprint test. Results Using a within-participant correlational analyses, results indicated a positive relationship between the rate of the last second of a laryngeal diadochokinesis task that was produced at a high fundamental frequency/high sound level and anaerobic power. Forced vital capacity was not correlated with any of the vocal function tasks. Conclusions These preliminary results indicate that aspects of the laryngeal diadochokinesis task produced at a high fundamental frequency and high sound level may be useful as an ecologically valid measure of vocal power ability. Quantification of vocal power ability may be useful as a vocal fitness assessment or as an outcome measure for voice rehabilitation and habilitation for patients with vocally demanding jobs.

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