Journal articles: 'Acceleration meter'

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Arifin, Mochamad, Wahyu Andhyka Kusuma, and Syaifuddin Syaifuddin. "Monitoring Jarak Tempuh Lari Menggunakan Sensor Accelerometer." Jurnal Repositor 2, no. 6 (April 14, 2020): 795. http://dx.doi.org/10.22219/repositor.v2i6.781.

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Abstrak Berlari merupakan frekuensi langkah yang dipercepat sehingga pada waktu berlari terdapat kecenderungan badan melayang. Pada saat berlari kedua kaki tidak menyentuh sekurang – kurangnya satu kaki tetap menyentuh tanah. Seiring perkembangan teknologi yang semakin pesat dan maju, untuk mengukur suatu percepatan ketika berlari dapat menggunakan teknologi accelerometer. Accelerometer dapat digunakan sebagai alat bantu manusia yang memiliki beberapa kelebihan terutama untuk pengecekan percepatan dan jarak tempuh. Selain itu, accelerometer digunakan untuk mengukur percepatan, mendeteksi getaran, dan bisa juga untuk percepatan gravitasi. Pendeteksian gerakan berdasarkan pada 3 sumbu yaitu kanan-kiri, atas-bawah dan depan-belakang. Pada penelitian ini, besaran akselerasi pada sumbu x, y, dan z dari sensor accelerometer dengan menggunakan parameter jarak meliputi 5 meter, 10 meter , 15 meter dan 20 meter. Dari hasil pengujian yang diperoleh sebanyak 5 responden maka dapat diambil kesimpulan bahwa kecocokan data pengujian yang diambil secara manual dengan aplikasi memiliki perbedaan. Dari jarak pengujian 5 meter diperoleh hasil galat presentase error sebanyak 7,96%. Jarak 10 meter diperoleh sebanyak 6,4%. Jarak 15 meter diperoleh 13,68% meter. Selanjutnya, jarak 20 meter yaitu 11 %. Pengujian dilakukan dengan menggunakan aplikasi monitoring pada smartphone yang telah terinstall dan diletakkan pada saku celana responden sehingga akan diperoleh nilai data pada sumbu x,y dan z pada aplikasi yang kemudian di konversikan pada grafik gelombang sinus dan perhitungan manual berupa perhitungan jarak dan galat presentase error. Abstract Running is an accelerated frequency of steps so that when running there is a tendency for the body to float. When running both feet do not touch at least - one foot still touches the ground. Along with the development of technology that is increasingly rapid and advanced, to measure an acceleration when running can use the accelerometer technology. Accelerometer can be used as a human aid which has several advantages, especially for checking acceleration and mileage. In addition, the accelerometer is used to measure acceleration, detect vibrations, and can also be used for accelerating gravity. Motion detection is based on 3 axes namely right-left, top-bottom and front-back. In this study, the amount of acceleration on the x, y, and z axis of the accelerometer sensor using distance parameters includes 5 meters, 10 meters, 15 meters and 20 meters. From the test results obtained as many as 5 respondents, it can be concluded that the suitability of the test data taken manually with the application has a difference. A distance of 10 meters was obtained as much as 6.4%. A distance of 15 meters obtained 13.68% meters. Furthermore, the distance of 20 meters is 11%. The test is done by using a monitoring application on a smartphone that has been installed and placed in the pocket of the respondent's pants so that the data values on the x, y and z axes in the application are then converted to a sine wave graph and manual calculations in the form of distance and error percentage errors.

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Hogan, Mark J. "Electron and Positron Beam–Driven Plasma Acceleration." Reviews of Accelerator Science and Technology 09 (January 2016): 63–83. http://dx.doi.org/10.1142/s1793626816300036.

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Particle accelerators are the ultimate microscopes. They produce high energy beams of particles — or, in some cases, generate X-ray laser pulses — to probe the fundamental particles and forces that make up the universe and to explore the building blocks of life. But it takes huge accelerators, like the Large Hadron Collider or the two-mile-long SLAC linac, to generate beams with enough energy and resolving power. If we could achieve the same thing with accelerators just a few meters long, accelerators and particle colliders could be much smaller and cheaper. Since the first theoretical work in the early 1980s, an exciting series of experiments have aimed at accelerating electrons and positrons to high energies in a much shorter distance by having them “surf” on waves of hot, ionized gas like that found in fluorescent light tubes. Electron-beam-driven experiments have measured the integrated and dynamic aspects of plasma focusing, the bright flux of high energy betatron radiation photons, particle beam refraction at the plasma–neutral-gas interface, and the structure and amplitude of the accelerating wakefield. Gradients spanning kT/m to MT/m for focusing and 100[Formula: see text]MeV/m to 50[Formula: see text]GeV/m for acceleration have been excited in meter-long plasmas with densities of 10[Formula: see text]–10[Formula: see text][Formula: see text]cm[Formula: see text], respectively. Positron-beam-driven experiments have evidenced the more complex dynamic and integrated plasma focusing, 100[Formula: see text]MeV/m to 5[Formula: see text]GeV/m acceleration in linear and nonlinear plasma waves, and explored the dynamics of hollow channel plasma structures. Strongly beam-loaded plasma waves have accelerated beams of electrons and positrons with hundreds of pC of charge to over 5[Formula: see text]GeV in meter scale plasmas with high efficiency and narrow energy spread. These “plasma wakefield acceleration” experiments have been mounted by a diverse group of accelerator, laser and plasma researchers from national laboratories and universities around the world. This article reviews the basic principles of plasma wakefield acceleration with electron and positron beams, the current state of understanding, the push for first applications and the long range R&D roadmap toward a high energy collider.

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Lieberman, Paul, John Czajkowski, and John Rchard. "Optical System for Measurement of Pyrotechnic Test Accelerations." Journal of the IEST 35, no. 6 (November 1, 1992): 25–39. http://dx.doi.org/10.17764/jiet.2.35.6.jt5tv5811217p704.

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This effort was directed at comparing the response of several different accelerometcr and amplifier combinations to the pyrotechnic pulse simulating the ordnance separation of stages of multistage missiles. These pyrotechnic events can contain peak accelerations in excess of 100,000 G and a frequency content exceeding 100,000 Hz. The main thrust of this work was to compare the several accelerometer systems with each other and with a very accurate laser Doppler displacement meter in order to establish the frequency bands and acceleration amplitudes where the accelerometer systems are in error. The comparisons were made in simple sinc-wave and low-acceleration amplitude environments, as well as in very severe pyroshock environments. An optical laser Doppler displacement meter (LDDM) was used to obtain the displacement velocity and acceleration histories, as well as the corresponding shock spectrum.

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Yulmardani, Yulmardani. "Pengaruh Metode Latihan Acceleration Sprint terhadap Kemampuan Lari 60 Meter Siswa." JPGI (Jurnal Penelitian Guru Indonesia) 4, no. 1 (November 10, 2019): 50. http://dx.doi.org/10.29210/02364jpgi0005.

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<p><em>The problem in this study is the ability to run 60 meters Class V SDN 03 Pancung Tebal North Bayang District because 60 meters running are not in accordance with the time that should be achieved by junior-high-school students. Many factors cause the 60-meter running ability is not good, including the training method. For this reason, it is necessary to conduct a study with the aim to find out how much influence the acceleration sprint training method has on the ability to run 60 meters Class V SDN 03 Pancung Thick Bayang Utara District. This type of research is quasi-experimental. The study population was students of Class V SDN 03 Pancung Tebal District of North Bayang. Samples using purposive sampling technique, namely sampling based on the intentions that have been determined previously or with certain considerations, amounting to 15 people aged 11-13 years. Data was collected using a 60-meter student test with a 60-meter running ability test. The data analysis technique is the T-Test. The results of the data analysis show that: There is a significant influence on the acceleration sprint exercise of the ability to run 60 m Grade V students of SDN 03 Pancung Tebal, North Bayang District.</em></p>

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BYUN, JU-SUK, and DONG-HUN RYU. "HIGHLY ACCELERATED LIFETIME TEST METHOD STUDY FOR THE DIAPHRAGM GAS METER RELIABILITY ENHANCEMENT." International Journal of Air-Conditioning and Refrigeration 21, no. 03 (September 2013): 1350021. http://dx.doi.org/10.1142/s2010132513500211.

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The present study has been conducted to verify and enhance the MTBF of the diaphragm gas meter. The goals of this study were the development of acceleration test method for the diaphragm gas meter and the guarantee of B10 lifetime of 3000 h in normal operation condition. To develop the acceleration test method, the flow rate and the operation temperature were chosen as acceleration factors and experiments of 1000 h in four conditions are conducted. The results showed that the log-normal life distribution conforms to the diaphragm gas meter life distribution and the combination of the temperature and the flow rate can have the acceleration factor of up to 3.48. The uncertainty of the flow rate accuracy verification is 0.20% and the log-normal life distribution is used.

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Farias, Déborah De Araújo, Haroldo Gualter Santana, Valter Acetto Tenório, Olívia Nogueira Coelho, Jeffrey M. Willardson, and Humberto Miranda. "Effectiveness of a power-training block with two cluster set configurations in recreationally trained young adults on sprint performance." Revista Andaluza de Medicina del Deporte 13, no. 1 (October 8, 2019): 29–34. http://dx.doi.org/10.33155/j.ramd.2019.10.001.

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Objective: The purpose of the present study was to evaluate the effectiveness of a three-week power-training block with two different cluster set configurations using pneumatic equipment on sprint performance. Method: Thirty recreationally active subjects participated in this study (18 female and 12 male). The subjects were distributed randomly into Control (CG), Cluster 1 (CL1) and Cluster 2 (CL2) groups. The experimental procedure involved a three-week training period; at the pre- and post-training time points, a 20-meter sprint tests were applied. Results: There was an intergroup significant difference for the CL2 versus the CG for time, acceleration and velocity in the first 10-meter sprint test. The alpha value used was p < 0.05. For total time, total velocity, time and velocity in the first 10-meter sprint test: significant differences were observed for both CL1 and CL2 at the post-test. The total acceleration and acceleration in the first 10-meter sprint test was significantly different for the CL2 at the post-training. There were no significant differences in time, velocity and acceleration in the final 10-meter sprint test between groups. Conclusion: These results suggest that interventions with intra-set intervals (specifically CL2) using pneumatic equipment allow for positive adaptations in velocity and acceleration after three-week training.

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Susiloningtyas, Dewi, Della Ayu Lestari, and Supriatna Supriatna. "Pemodelan Spasial Peak Ground Acceleration dan Prediksi Luas Genangan Tsunami di Kota Bengkulu." Majalah Geografi Indonesia 34, no. 2 (September 28, 2020): 166. http://dx.doi.org/10.22146/mgi.44168.

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Abstrak Kota Bengkulu merupakan salah satu kota yang berada pada pesisir barat Pulau Sumatera yang mendapat pengaruh dari pertemuan Lempeng Indo-Australia dan Lempeng Eurasia serta Patahan Mentawai. Kondisi ini menyebabkan Kota Bengkulu rawan akan bencana gempa bumi dan tsunami. Tujuan penelitian ini adalah untuk mengetahui pola spasial kawasan rawan gempa bumi dan tsunami sebagai salah satu upaya mitigasi bencana. Kawasan rawan gempa bumi diamati dengan mencari Peak Ground Acceleration (PGA) gempa bumi di Kota Bengkulu pada tahun 2010 hingga 2018 sedangkan kawasan rawan tsunami diamati dengan mencari luas genangan tsunami dalam 3 skenario yaitu ketinggian gelombang 5 meter, 20 meter dan 25 meter dari garis pantai. Hasil penelitian menunjukkan bahwa wilayah terbangun eksiting yang memiliki resiko tertinggi berada bagian pesisir selatan Kota Bengkulu dengan wilayah PGA tinggi serta genangan tsunami yang luas dari tinggi gelombang tsunami 25 meter.Wilayah ini berada pada Kecamatan Kampung Melayu dengan prediski luas terdampak sebesar 653,69 Ha. Abstract Bengkulu City is one of the cities on the west coast of Sumatra Island which has been influenced by the Indo-Australian Plate and the Eurasian Plate as well as the Mentawai Fault. This condition makes Bengkulu City prone to earthquakes and tsunamis. The purpose of this study is to determine the spatial pattern of earthquake and tsunami prone areas as one of the disaster mitigation efforts. Earthquake-prone areas were observed by looking for the Peak Ground Acceleration (PGA) of earthquakes in Bengkulu City from 2010 to 2018 while tsunami-prone areas were observed by looking for the area of tsunami inundation in 3 scenarios, namely the wave height of 5 meters, 20 meters and 25 meters from the coastline . The results showed that the highly developed area with the highest risk was the southern coast of Bengkulu City with a high PGA area and a large tsunami inundation from a tsunami wave height of 25 meters. This area is located in the Kampung Melayu sub-district with a predisposition of an affected area of 653.69 hectares.

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Sapra, Neil V., Ki Youl Yang, Dries Vercruysse, Kenneth J. Leedle, Dylan S. Black, R. Joel England, Logan Su, et al. "On-chip integrated laser-driven particle accelerator." Science 367, no. 6473 (January 2, 2020): 79–83. http://dx.doi.org/10.1126/science.aay5734.

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Particle accelerators represent an indispensable tool in science and industry. However, the size and cost of conventional radio-frequency accelerators limit the utility and reach of this technology. Dielectric laser accelerators (DLAs) provide a compact and cost-effective solution to this problem by driving accelerator nanostructures with visible or near-infrared pulsed lasers, resulting in a 104 reduction of scale. Current implementations of DLAs rely on free-space lasers directly incident on the accelerating structures, limiting the scalability and integrability of this technology. We present an experimental demonstration of a waveguide-integrated DLA that was designed using a photonic inverse-design approach. By comparing the measured electron energy spectra with particle-tracking simulations, we infer a maximum energy gain of 0.915 kilo–electron volts over 30 micrometers, corresponding to an acceleration gradient of 30.5 mega–electron volts per meter. On-chip acceleration provides the possibility for a completely integrated mega–electron volt-scale DLA.

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Strasser, Ryan, Sylvester Badua, Ajay Sharda, Devin Mangus, and Lucas Haag. "Performance of Planter Electric-drive Seed Meter during Simulated Planting Scenarios." Applied Engineering in Agriculture 35, no. 6 (2019): 925–35. http://dx.doi.org/10.13031/aea.13763.

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Highlights. Seed meter rpm error decreased with increasing planter speed during steady states.Point-row operations could result in up to 10-13 seeds being over- or under-planted.Seed meter rpm error varied from -7.2% to 7.9% during curve planting transient states. Abstract. Electric drive seed metering systems have become a common method for singulating row crop seed. These singulation systems have substantially fewer moving parts and can potentially respond more quickly than other drive mechanisms. However, the accuracy and response time of these systems has yet to be examined to quantify potential benefits of adoption. The objectives of this study were (1) to quantify accuracy and response time of electric meter drives to varying ground speeds and speed transitions during in-lab simulation planting operations on straight-line and curves, and (2) to compare actual seed meter motor speed to target meter speed during simulation field scenarios. To quantify metering system performance, test scenarios were developed to simulate planting on headlands, within field boundaries including traversing in-field obstacles, and planting on curves with different radii. Ground speeds during simulation scenarios were 7.2, 12.9, and 16.1 kph when operating on straight rows and 6.0, 8, 11, and 14.5 kph when planting along curvilinear paths. Test scenarios also included planter acceleration and deceleration at 0.4 and 0.6 m/s2 when traversing in-field obstacles and tighter radii curves. Tests were conducted with two different seeding rates, 44,460 and 88,920 seeds/ha. Eight high frequency encoders were mounted on the electric meters of selected row units to record real-time meter rpm and quantify seed meter accuracy and response time. A custom DAQ system was developed to read simulation test scenario data files in ASCII text file format and send prescribed ground speed commands to the Horsch Maestro 24.30 planter’s ECU at 10 Hz using a program written in LabVIEW. Results indicated that seed metering accuracy increased as ground speed increased resulting in a significantly lower seed meter rpm error at 16.1 kph under steady-state conditions. During transient states, seed meters needed 3 to 4 s to respond during deceleration and acceleration resulting to seed meter rpm error ranging from -3.7% to 3.6% at 44,460 seeds/ha seeding rate and from -3.8% to 3.2% at 88,920 seeds/ha seeding rate. During point-row operations, the response time of the meters was 0.4 s which could result in up to 10 seeds being under-planted and up to 13 seeds being over-planted per row unit. During curvilinear planting, seed meter rpm error for steady states ranged from -0.5% to 0.8% across varying turn radii resulting to seeding rate error ranging from -223 to 370 seeds/ha while during transient states seed meter rpm error varied from -7.2% to 7.9% resulting to seeding rate error ranging from -5,886 to 7,187 seeds/ha. Keywords: Seed meter rpm, Seeding rate error, Simulation, Variable rate planting, Planter meter.

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Lasala, Melchor, Hiroshi Inoue, Roberto Tiglao, Zhengying Fan, Bartolome Bautista, and Ishmael Narag. "Establishment of Earthquake Intensity Meter Network in the Philippines." Journal of Disaster Research 10, no. 1 (February 1, 2015): 43–50. http://dx.doi.org/10.20965/jdr.2015.p0043.

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A network of realtime intensity meters is being established in different parts of the Philippines under a Japan-Philippines cooperation. The intensity meters can record and transmit on a near real-time basis the site-specific levels of groundshaking in terms of macroseismic intensity, peak ground acceleration and peak ground velocity. The intensity meters evaluate earthquake effects using the Philippine earthquake intensity scale – PHIVOLCS Earthquake Intensity Scale (PEIS). Deployment of the instruments was planned according to an optimum distribution with respect to active earthquake generators and vulnerable communities. All manned seismic stations of PHIVOLCS were equipped with an intensity meter while the rest was deployed in relevant disaster risk reduction and management centers. In its initial operation which started in 2012, the network captured several significant earthquakes such as theMw7.2 in Bohol in 2013.

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Buhari, Muhammad Ramli, Muchamad Samsul Huda, Hamdiana Hamdiana, and Ruslan Ruslan. "Interaction Of Training Methods and Explosive Power On Learning Outcomes For Running 100 Meters." Kinestetik : Jurnal Ilmiah Pendidikan Jasmani 5, no. 1 (March 29, 2021): 136–46. http://dx.doi.org/10.33369/jk.v5i1.14608.

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The purpose of this study was to determine the interaction between the training method and the explosive power of the leg muscles on the learning outcomes of the 100 meter run. This research was conducted at the Teaching and Education Faculty of Mulawarman University with an experimental method, with a 2 x 2 factorial design. The sample in this study was 120 students, divided into 4 groups, each group consisting of 30 students. Analysis of the data used is a two-way Analysis of Variance (ANOVA). The results of the study stated that: (1) The acceleration sprint training method and the sprint training method did not have different effects on improving learning outcomes in running 100 meters, Fo = 5.452 > Ft5% db (1;116) = 3.84, (2) Without paying attention to the use of the two forms of training methods (acceleration sprint training method and the sprint training method), the explosive power of the strong leg muscles has a different effect when compared to the explosive power of the weak leg muscles on the learning outcomes of running 100 meters, Fo = 0.237 ? Ft5% db (1;116) = 3.84, (3). There is an interaction between the training method and the explosive power of the leg muscles on the learning outcomes of the 100 meter run, Fo = 13.044 > Ft5% db (1;116) = 3.84.

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Struzik, Artur, Grzegorz Konieczny, Mateusz Stawarz, Kamila Grzesik, Sławomir Winiarski, and Andrzej Rokita. "Relationship between Lower Limb Angular Kinematic Variables and the Effectiveness of Sprinting during the Acceleration Phase." Applied Bionics and Biomechanics 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/7480709.

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The ability to reach a high running velocity over a short distance is essential to a high playing performance in team games. The aim of this study was to determine the relationship between running time over a 10-meter section of a 30-meter sprint along a straight line and changes in the angle and angular velocity that were observed in the ankle, knee, and hip joints. The possible presence may help to optimize motion efficiency during acceleration sprint phase. Eighteen girls involved in team sports were examined in the study. The Fusion Smart Speed System was employed for running time measurements. The kinematic data were recorded using the Noraxon MyoMotion system. Statistically significant relationships were found between running time over a 10-meter section and the kinematic variables of hip and ankle joints. An excessively large flexion in hip joints might have an unfavorable effect on running time during the acceleration phase. Furthermore, in order to minimize running time during the acceleration phase, stride should be maintained along a line (a straight line) rather than from side to side. It is also necessary to ensure an adequate range of motion in the hip and ankle joints with respect to the sagittal axis.

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Inoue, Hiroshi, Zhengying Fan, Melchor Lasala, Robert Tiglao, Bartolome Bautista, Debbie Rivera, and Ishmael Narag. "Development of Seismic Intensity Meter for the Philippines." Journal of Disaster Research 10, no. 1 (February 1, 2015): 35–42. http://dx.doi.org/10.20965/jdr.2015.p0035.

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We designed a seismic intensity meter and a data collection network for use in the Philippines. The station unit deployed consists of a digital acceleration sensor with 0.1 gal noise and a compact Microsoft Windows PC. The station unit, which is designed to be installed in local government offices, calculates values every 10 seconds for the PEIS (Philippine Earthquake Intensity Scale), and these values are shown on a display and transmitted to the main PHIVOLCS office over the Internet. One hundred units to be deployed throughout the country are now being distributed to offices.

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Johnson, G. R. "Measurement of shock acceleration during walking and running using the Shock Meter." Clinical Biomechanics 5, no. 1 (February 1990): 47–50. http://dx.doi.org/10.1016/0268-0033(90)90032-2.

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Hidayati, Anissa Maria, R. W. Sri Prabandiyani, and I. Wayan Redana. "Laboratory Tests on Failure of Retaining Walls Caused by Sinusoidal Load." Applied Mechanics and Materials 776 (July 2015): 41–46. http://dx.doi.org/10.4028/www.scientific.net/amm.776.41.

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The failure of retaining wall construction can be occurred due to the forces acting on the rear wall exceed the capacity of its stability. Dynamic acceleration parameters can affect the movement pattern of granular soil behind the retaining wall. This research aims to study the movement of grain behind the retaining wall by laboratory testing. The retaining wall model was made in the glass box of a length of 2 meters, width of 0.4 meter and height of 1 meter. This models used gravity types, which was made of concrete and was placed on dry sand with a trapezoid-shaped a height of 20 centimeters, width of peak 2 centimeters and width of below 10 centimeters. The model was examined using dry sand material with grain size that can pass through sieve No. 4 and retained on sieve No.100 of loose sand density (γd = 1.4184 gr/cm3). The model was vibrated using shaking tables with a given variation on sinusoidal loads and was recorded using accellerometer. The displacement of granular soil in a particular point was also monitored during vibration. The results shows that there is different grain movements resulted from different acceleration. The increase in vibration accelerates the grain to fill the empty space between the grains. This causes wider movement area of the grain and expands the landslide areas.

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KARIMI, HAMID REZA, and KJELL G. ROBBERSMYR. "SIGNAL ANALYSIS AND PERFORMANCE EVALUATION OF A VEHICLE CRASH TEST WITH A FIXED SAFETY BARRIER BASED ON HAAR WAVELETS." International Journal of Wavelets, Multiresolution and Information Processing 09, no. 01 (January 2011): 131–49. http://dx.doi.org/10.1142/s0219691311003979.

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This paper deals with the wavelet-based performance analysis of the safety barrier for use in a full-scale test. The test involves a vehicle, a Ford Fiesta, which strikes the safety barrier at a prescribed angle and speed. The vehicle speed before the collision was measured. Vehicle accelerations in three directions at the center of gravity were measured during the collision. The yaw rate was measured with a gyro meter. Using normal speed and high-speed video cameras, the behavior of the safety barrier and the test vehicle during the collision was recorded. Based upon the results obtained, the tested safety barrier has proved to satisfy the requirements for an impact severity level. By taking into account the Haar wavelets, the property of integral operational matrix is utilized to find an algebraic representation form for calculate of wavelet coefficients of acceleration signals. It is shown that Haar wavelets can construct the acceleration signals well.

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Li, Wen Liang, Li Qin Wang, Xiao Li Zhao, and Gang Chen. "The Effect of Helical Gear Parameters on the Meshing Noise." Advanced Materials Research 418-420 (December 2011): 2060–64. http://dx.doi.org/10.4028/www.scientific.net/amr.418-420.2060.

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In this paper, the gear acceleration noise model is first built up. The theoretical formula for calculating meshing acceleration noise is developed by dynamic analysis. Base on the impact theory, we first treat the gear meshing behavior as two variable radius cylinders, construct dynamics model, and then according to the industry standard to calculate sound pressure value one meter away by simulation,. Finally, we obtain the optimize equation according to the relation of parameters and noise.

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Fell, D. W., J. C. Wall, M. Payne, S. Sellers, and B. Tatford. "Consistency of step lengths is not influenced by walking speed or an acceleration zone: 4-meter vs. 10-meter walk tests." Physiotherapy 101 (May 2015): e377-e378. http://dx.doi.org/10.1016/j.physio.2015.03.596.

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Balsalobre-Fernández, Carlos, Carlos Mª Tejero-González, Juan del Campo-Vecino, and Dionisio Alonso-Curiel. "The Effects of a Maximal Power Training Cycle on the Strength, Maximum Power, Vertical Jump Height and Acceleration of High-Level 400-Meter Hurdlers." Journal of Human Kinetics 36, no. 1 (March 1, 2013): 119–26. http://dx.doi.org/10.2478/hukin-2013-0012.

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The aim of this study was to determine the effects of a power training cycle on maximum strength, maximum power, vertical jump height and acceleration in seven high-level 400-meter hurdlers subjected to a specific training program twice a week for 10 weeks. Each training session consisted of five sets of eight jump-squats with the load at which each athlete produced his maximum power. The repetition maximum in the half squat position (RM), maximum power in the jump-squat (W), a squat jump (SJ), countermovement jump (CSJ), and a 30-meter sprint from a standing position were measured before and after the training program using an accelerometer, an infra-red platform and photocells. The results indicated the following statistically significant improvements: a 7.9% increase in RM (Z=-2.03, p=0.021, δc=0.39), a 2.3% improvement in SJ (Z=-1.69, p=0.045, δc=0.29), a 1.43% decrease in the 30-meter sprint (Z=-1.70, p=0.044, δc=0.12), and, where maximum power was produced, a change in the RM percentage from 56 to 62% (Z=-1.75, p=0.039, δc=0.54). As such, it can be concluded that strength training with a maximum power load is an effective means of increasing strength and acceleration in high-level hurdlers.

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Collins, Curtis A., James R. Clynch, Thomas A. Rago, and Tetyana Margolina. "Comparison of SWATH and Monohull Vessel Motion for Regional Class Research Vessels." Marine Technology Society Journal 41, no. 2 (June 1, 2007): 56–61. http://dx.doi.org/10.4031/002533207787442231.

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The attitude characteristics of two small research vessels, a 539 displacement ton monohull (R/V Point Sur) and a 419 displacement ton SWATH (R/V Western Flyer) are compared. The comparison is based upon 134 (147) motion measurements carried out on the Point Sur (Western Flyer) in 2003-2005. Measurements were made using a tilt meter and a vertical gyro. When hove-to, rms pitch and roll (vertical acceleration) increased with increasing sea height on the monohull at three (six) times the rate of the SWATH. When cruising, the fins on the subsurface hulls of the SWATH effectively damped the pitch (roll) caused by head and bow seas, reducing the amplitude by a factor of 2 (10) compared to those observed while hove-to; accelerations were reduced by a greater amount as the frequency of pitch and roll was reduced. In contrast, cruising motion (pitch, roll, acceleration) on the monohull increased when seas were on or forward of the beam. The only point where the cruising monohull appeared to out-perform the SWATH was for pitch in quartering/stern seas > 10 ft.

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Verdun, Jérôme, Roger Bayer, Emile E. Klingelé, Marc Cocard, Alain Geiger, and Mark E. Halliday. "Airborne gravity measurements over mountainous areas by using a LaCoste & Romberg air‐sea gravity meter." GEOPHYSICS 67, no. 3 (May 2002): 807–16. http://dx.doi.org/10.1190/1.1484525.

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This paper introduces a new approach to airborne gravity data reduction well‐suited for surveys flown at high altitude with respect to gravity sources (mountainous areas). Classical technique is reviewed and illustrated in taking advantage of airborne gravity measurements performed over the western French Alps by using a LaCoste & Romberg air‐sea gravity meter. The part of nongravitational vertical accelerations correlated with gravity meter measurements are investigated with the help of coherence spectra. Beam velocity has proved to be strikingly correlated with vertical acceleration of the aircraft. This finding is theoretically argued by solving the equation of the gravimetric system (gravity meter and stabilized platform). The transfer function of the system is derived, and a new formulation of airborne gravity data reduction, which takes care of the sensitive response of spring tension to observable gravity field wavelengths, is given. The resulting gravity signal exhibits a residual noise caused by electronic devices and short‐wavelength Eötvös effects. The use of dedicated exponential filters gives us a way to eliminate these high‐frequency effects. Examples of the resulting free‐air anomaly at 5100‐m altitude along one particular profile are given and compared with free‐air anomaly deduced from the classical method for processing airborne gravity data, and with upward‐continued ground gravity data. The well‐known trade‐off between accuracy and resolution is discussed in the context of a mountainous area.

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Genrich, J. F., and J. B. Minster. "Near‐real time reduction of shipboard gravity using Kalman‐filtered GPS measurements." GEOPHYSICS 56, no. 12 (December 1991): 1971–79. http://dx.doi.org/10.1190/1.1443008.

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We have developed a Kalman filter to estimate accurate Eötvös corrections and horizontal ship accelerations from Global Positioning System (GPS) fixes. High‐resolution shipboard gravity measurements are obtained with a newly designed, linear phase, Finite Impulse Response (FIR) low‐pass filter. Both filters are combined to yield accurate, near‐real time, Eötvös‐corrected underway gravity estimates. Error ranges that reflect uncertainty in navigation for these estimates are calculated from autocovariances of Kalman velocity estimates by means of variance propagation expressions for time‐invariant linear digital filters. Estimates of horizontal ship acceleration are combined with a simplified instrument impulse response model in an attempt to remove transient noise from the gravimeter output. We apply the technique to data collected by two shipboard gravimeters, a LaCoste & Romberg Model S Air‐Sea Gravity Meter and a Bell Aerospace BGM-3 Marine Gravity Meter System, operated side‐by‐side on the Scripps R/V Thomas Washington during Leg 1 of the Roundabout expedition. In the absence of significant horizontal accelerations due to course or speed changes, both instruments yield data with good repeatability, characterized by rms differences of less than 1 mGal. Horizontal accelerations generate transient signals that cannot be modeled at present to an accuracy of better than 5 mGal. Difficulties in removing these transients are primarily due to insufficient quantitative knowledge of the response of the instrument, including the gyro‐stabilized platform. This can be determined analytically or empirically.

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Zhao, Jian, Ming Yu, Ling Li Zhang, Wen Jin Wang, and Zhi Qiang Zhang. "Experimental Study on Dynamic Characteristic of Pipeline Flow-Meter System." Key Engineering Materials 584 (September 2013): 126–30. http://dx.doi.org/10.4028/www.scientific.net/kem.584.126.

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In order to provide high precise data for urban natural gas pipeline network dynamic modification and to diagnose the urban natural gas pipeline network fault, the dynamic characteristic of the flow-meter system, which is the main component of a natural gas pipeline network, has to be obtained precisely. The experimental modal parameters identification method base on the modal theories is proposed to substitute for the finite element method to identify the modal parameters of the flow-meter System. Multiple-point exciting by a hammer and single-point collecting by acceleration sensor can obtain testing data of the flow-meter System. The initial frequency and damping ratio of the flow-meter System can be distinguished out base on the testing impulse respond functions data. According to these modal parameters, the reasons of its faults under a certain working condition can be analyzed specifically. Simultaneously, the accuracy and reliability of this parameter identification method can be inspected on experiment.

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Prasasti, Ninuk Ragil, and Denny Hermawanto. "A Proposed Method to Find Exciter’s Maximum Acceleration Magnitude on Vibration Meter Calibration System." Instrumentasi 44, no. 2 (December 16, 2020): 103. http://dx.doi.org/10.31153/instrumentasi.v44i2.206.

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Kamai, Kazuto, and Ryosuke Matsuzaki. "PS13 Measuring deformation of interior tire and estimating coefficient of friction using acceleration meter." Proceedings of the Materials and Mechanics Conference 2013 (2013): _PS13–1_—_PS13–3_. http://dx.doi.org/10.1299/jsmemm.2013._ps13-1_.

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Cane, H. V., and D. V. Reames. "Soft X-ray emissions, meter-wavelength radio bursts, and particle acceleration in solar flares." Astrophysical Journal 325 (February 1988): 895. http://dx.doi.org/10.1086/166060.

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Huang, Xianbin, Chenyang Liu, Song Hou, Chunyang Chen, Yahong Wangren, and Jialin Xu. "An Analysis of the Impact Exerted on Bearing Capacity of Pier and Pile after Increasing Pile Cap Height." Shock and Vibration 2018 (June 25, 2018): 1–9. http://dx.doi.org/10.1155/2018/9867897.

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An analysis was carried out in this paper on the bearing capacity of pier pile and seismic performance rule when the low-pile cap is increased by 1 meter, 2 meters, and 3 meters. The bottom of the pile cap of pier no. 11 of Minjiang River bridge faces three “lows”: 7.6 meters lower than island, 4.6 meters lower than natural river bed, and 6.5 meters lower than low water level. The numerical simulation method is adopted to input three seismic waves of Wolong, Bajiao, and EL to evaluate the bearing capacity of pier and pile under strong earthquakes. Using the standard formula and numerical simulation method, it is observed that the bending moment and axial force of bridge pier show an insignificant change under different seismic waves when the pile cap is increased by 0–3 meters. With peak ground acceleration increased to 0.35 g, the vertical bearing capacity and flexural capacity of pier and pile gratify the requirements; however, the pile foundation will be subject to compression and bending damage.

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Utami, Tri Setyo, Bambang Purwanto, and Edy Mintarto. "NEUROMUSCULAR TAPING TEKNIK KOMPRESI MENINGKATKAN EXPLOSIVE POWER DAN MAXIMUM SPEED LARI 100 METER." Care : Jurnal Ilmiah Ilmu Kesehatan 8, no. 3 (November 2, 2020): 464. http://dx.doi.org/10.33366/jc.v8i3.1304.

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Sprint 100 meter that has sprint phase such as acceleration, maximum speed, and deceleration which can improvement performance in sprinting ability. The aim of this study to showing effect of neuromuscular taping compression technique on explosive power and sprint 100 meter to provide increased muscle functional ability, tendon efficiency, and joint stability by stimulating the nerves. This study is an experimental research field with a pre-test and post-test control group design. Twenty-two samples were selected from the population of East Java sprint athletes based on the consecutive sampling technique which was divided into two groups randomly. Neuromuscular compression technique are given Intervention in the gastrocnemius area on treatment group after pre-test. The explosive power are using tandem vertical jump test measurenment and infared electrics time respectively.The paired sample T-test are showing increases in expolsive power in the gastrocnemius and sprint 100 meter maximum phases (p

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Hua, Tianbo, Xingguo Yang, Qiang Yao, and Hongtao Li. "Assessment of Real-Time Compaction Quality Test Indexes for Rockfill Material Based on Roller Vibratory Acceleration Analysis." Advances in Materials Science and Engineering 2018 (2018): 1–15. http://dx.doi.org/10.1155/2018/2879321.

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Compaction quality is directly related to the structure and seepage stability of a rockfill dam. To timely and accurately test the compaction quality of the rockfill material, four real-time test indexes were chosen to characterize the soil compaction degree based on the analysis of roller vibratory acceleration, including acceleration peak value (ap), acceleration root mean square value (arms), crest factor value (CF), and compaction meter value (CMV). To determine which of these indexes is the most appropriate, a two-part field compaction experiment was conducted using a vibratory roller in different filling zones of the dam body. Data on rolling parameters, real-time test indexes, and compaction quality indexes were collected to perform statistical regression analyses. Combined with the spectrum analysis of the acceleration signal, it was found that the CF index best characterizes the compaction degree of the rockfill material among the four indexes. Furthermore, the quantitative relations between the real-time index and compaction quality index were established to determine the control criterion of CF, which can instruct the site work of compaction quality control in the rockfill rolling process.

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Hsiao, Po-Jen, Chih-Chien Chiu, Ke-Hsin Lin, Fu-Kang Hu, Pei-Jan Tsai, Chun-Ting Wu, Yuan-Kai Pang, et al. "Usability of Wearable Devices With a Novel Cardiac Force Index for Estimating the Dynamic Cardiac Function: Observational Study." JMIR mHealth and uHealth 8, no. 7 (July 21, 2020): e15331. http://dx.doi.org/10.2196/15331.

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Background Long-distance running can be a form of stress to the heart. Technological improvements combined with the public’s gradual turn toward mobile health (mHealth), self-health, and exercise effectiveness have resulted in the widespread use of wearable exercise products. The monitoring of dynamic cardiac function changes during running and running performance should be further studied. Objective We investigated the relationship between dynamic cardiac function changes and finish time for 3000-meter runs. Using a wearable device based on a novel cardiac force index (CFI), we explored potential correlations among 3000-meter runners with stronger and weaker cardiac functions during running. Methods This study used the American product BioHarness 3.0 (Zephyr Technology Corporation), which can measure basic physiological parameters including heart rate, respiratory rate, temperature, maximum oxygen consumption, and activity. We investigated the correlations among new physiological parameters, including CFI = weight * activity / heart rate, cardiac force ratio (CFR) = CFI of running / CFI of walking, and finish times for 3000-meter runs. Results The results showed that waist circumference, smoking, and CFI were the significant factors for qualifying in the 3000-meter run. The prediction model was as follows: ln (3000 meters running performance pass probability / fail results probability) = –2.702 – 0.096 × [waist circumference] – 1.827 × [smoke] + 0.020 × [ACi7]. If smoking and the ACi7 were controlled, contestants with a larger waist circumference tended to fail the qualification based on the formula above. If waist circumference and ACi7 were controlled, smokers tended to fail more often than nonsmokers. Finally, we investigated a new calculation method for monitoring cardiac status during exercise that uses the CFI of walking for the runner as a reference to obtain the ratio between the cardiac force of exercise and that of walking (CFR) to provide a standard for determining if the heart is capable of exercise. A relationship is documented between the CFR and the performance of 3000-meter runs in a healthy 22-year-old person. During the running period, data are obtained while participant slowly runs 3000 meters, and the relationship between the CFR and time is plotted. The runner’s CFR varies with changes in activity. Since the runner’s acceleration increases, the CFR quickly increases to an explosive peak, indicating the runner’s explosive power. At this period, the CFI revealed a 3-fold increase (CFR=3) in a strong heart. After a time lapse, the CFR is approximately 2.5 during an endurance period until finishing the 3000-meter run. Similar correlation is found in a runner with a weak heart, with the CFR at the beginning period being 4 and approximately 2.5 thereafter. Conclusions In conclusion, the study results suggested that measuring the real-time CFR changes could be used in a prediction model for 3000-meter running performance.

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Fokin, G., and A. Vladyko. "Vehicles Positioning with the Fusion of Time of Arrival, Angle of Arrival and Inertial Measurements in the Extended Kalman Filter." Proceedings of Telecommunication Universities 7, no. 2 (June 30, 2021): 51–67. http://dx.doi.org/10.31854/1813-324x-2021-7-2-51-67.

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This work is devoted to the study of models and methods for improving posi-tioning accuracy in ultra-dense V2X/5G radio access networks for vehicles during maneuvers by combining range and angle primary measurements with measurements of inertial navigation systems in the extended Kalman filter. Onboard platformless inertial navigation system is represented by three-axis accelerometer and gyroscope modules. Integration of primary inertial measurements of acceleration and angular velocity with primary radio measurements of range and angle is carried out by converting the inertial coordinate system of the accelerometer and gyroscope into coordinate system of vehicle using quaternions. Secondary processing of inertial and radio measurements is carried out in the extended Kalman filter. The integration results show an increase in the accuracy of estimating the trajectory of a vehicle from several meters to one meter when turning at an inter-section.

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Kamai, Kazuto, and Ryosuke Matsuzaki. "20409 Measuring shape of tire contact patch and estimating coefficient of friction using triaxial acceleration meter." Proceedings of Conference of Kanto Branch 2015.21 (2015): _20409–1_—_20409–2_. http://dx.doi.org/10.1299/jsmekanto.2015.21._20409-1_.

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Kamai, Kazuto, and Ryosuke Matsuzaki. "PS06 Measuring shape of tire contact patch and estimating road friction coefficient usin triaxial acceleration meter." Proceedings of the Materials and Mechanics Conference 2014 (2014): _PS06–1_—_PS06–3_. http://dx.doi.org/10.1299/jsmemm.2014._ps06-1_.

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KAMAI, Kazuto, and Ryosuke MATSUZAKI. "J0450401 Measuring shape of tire contact patch and estimating road surface condition using an acceleration meter." Proceedings of Mechanical Engineering Congress, Japan 2014 (2014): _J0450401——_J0450401—. http://dx.doi.org/10.1299/jsmemecj.2014._j0450401-.

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KAMAI, Kazuto, and Ryosuke MATSUZAKI. "223 Measuring shape of tire contact patch and estimating road surface condition using triaxial acceleration meter." Proceedings of the Materials and processing conference 2013.21 (2013): _223–1_—_223–3_. http://dx.doi.org/10.1299/jsmemp.2013.21._223-1_.

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Sengupta, Soumyadeep, and Sreevalsa Kolathayar. "Evaluation of Liquefaction Potential of Soil at a Power Plant Site in Chittagong, Bangladesh." International Journal of Geotechnical Earthquake Engineering 11, no. 1 (January 2020): 1–16. http://dx.doi.org/10.4018/ijgee.2020010101.

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This study presents an evaluation of liquefaction potential for combined cycle power plant site located in the Chittagong district, Bangladesh, using standard penetration test blow counts (SPT-N values). The peak ground acceleration (PGA) values at a bedrock level were estimated deterministically using both linear and point source models as well as different ground motion prediction equations (GMPEs). The surface level hazard was estimated using amplification factors for the soil conditions present and the response spectrum at the center of the plant site was plotted. The liquefaction potential for the site was arrived at by using the SPT-N values of 33 boreholes in the site and at every 3-meter interval from the ground level to a depth of 30 meters. The results from the LPI contours at successive depths indicate that in the majority of the borehole locations, the soil up to 15 meters depth had a significant hazard of liquefaction. These findings from the present study can prove to be crucial from the structural point of view, for any future construction activities in the area.

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Punke, J. P., A. L. Speas, L. R. Reynolds, C. M. Andrews, and S. C. Budsberg. "Measurement differences between three versus five photocells during collection of ground reaction forces in dogs." Veterinary and Comparative Orthopaedics and Traumatology 02, no. 02 (2007): 98–101. http://dx.doi.org/10.1160/vcot-06-04-0035.

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SummaryThe differences between velocities and accelerations obtained from three and five photocells were examined when obtaining ground reaction force (GRF) data in dogs. Ground reaction force data was collected 259 times from 16 different dogs in two experimental phases. The first phase compared velocities and accelerations reported by the two systems based on trials accepted by the three photocell system. The second phase accepted trials based on data from five photocells. Three photocell data were calculated mathematically in the second phase in order to compare the values of both systems. The velocity and acceleration values obtained from each system were significantly different (at the hundredth of a meter per second). Differences in measured values did not result in acceptance of data by the three photocell system that would not have been acceptable with the five photocell system (false positives), but did result in rejection of acceptable data by the three photocell system (11% false negative rate). Given the small differences between the two systems, GRF data collected should not be significantly different, though the three photocell system is less efficient in gathering data due to the number of trials rejected as false negatives.

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Los Arcos, Asier, and Javier Yanci. "Specificity of jumping, acceleration and quick change of direction motor abilities in soccer players." Kinesiology 49, no. 1 (2017): 22–29. http://dx.doi.org/10.26582/k.49.1.12.

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The purpose of this study was to determine the underlying structure of the stretch-shortening cycle (SSC) jumping, acceleration and change-of-direction (COD) abilities in soccer players using principal component factor analysis (PCA). Based on the results of recent studies on male college athletes, we hypothesized that slow SSC jumping, acceleration and COD represent independent motor abilities in soccer players. Forty two soccer players (23.2±2.36 yr) performed three tests for each group of rapid lower-body movements: a) three vertical slow SSC jumping tests ‒ squat jump (SJ), countermovement jump (CMJ) and arm swing countermovement jump (CMJAS), b) three acceleration tests ‒ 5, 10 and 15 meter sprint times (ACC5, ACC10 and ACC15), and c) three COD tests ‒ modified agility test free (MATF), the 505 agility test (505) and 20 yard agility test (Y20). PCA was applied to establish the relationships among the factors (i.e. motor abilities) underlying the included manifest variables (i.e. performance tests). This procedure reduced all variables to a smaller number of independent latent dimensions. The results indicated three separate factors that may correspond to slow SSC jumping, acceleration and COD abilities. The magnitude of the correlation coefficients among the three motor abilities extracted was r<.56. Therefore, it is suggested that slow SSC jumping, acceleration and COD abilities represent independent motor abilities and consequently these should be trained and evaluated separately to assess soccer players’ physical profiles.

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Mubarak, Zulpryadi, Eko Aditya, and Dr Ir Barlian Dwinagara, MT. "PERUBAHAN STANDAR DESAIN JALAN TAMBANG BOBOKA SITE TANJUNG BULI BERDASARKAN KAJIAN GEOTEKNIK UNTUK MENGURANGI MATERIAL MOVEMENT DAN MEMPERCEPAT DEVELOPMENT JALAN TAMBANG." Prosiding Temu Profesi Tahunan PERHAPI 1, no. 1 (March 29, 2020): 553–60. http://dx.doi.org/10.36986/ptptp.v1i1.97.

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ABSTRAK Pada bulan Januari tahun 2018 PT. Antam Tbk UBP Nikel Maluku Utara, site Tanjung Buli, harus melanjutkan development jalan produksi yang bernama jalan tambang Boboka. Jalan tambang Boboka harus digunakan sebagai jalan produksi pada bulan Juli tahun 2018 agar produksi site Tanjung Buli tetap terjaga. Setelah dilakukan desain berdasarkan standar parameter jalan tambang dan dilakukan estimasi waktu development-nya, jalan tambang Boboka diperkirakan selesai diakhir bulan Agustus 2018. Untuk itu harus dilakukan percepatan pembuatan jalan tambang Boboka. Setelah dilakukan penelitian geoteknik, diketahui bahwa perubahan yang dapat dilakukan untuk standar parameter jalan tambang Boboka adalah dengan menambah tinggi jenjang, lebar berm dan sudut lereng keseluruhan. Perubahannya adalah, tinggi jenjang dari 6 meter menjadi 20 meter, lebar berm dari 3 meter menjadi 5 meter dan sudut lereng keseluruhan dari 45⁰ menjadi 55⁰. Untuk sudut kemiringan lereng tunggal tidak ada perubahan yaitu 60⁰. Dari perubahan tersebut diperoleh kenaikan nilai FK dari 1,30 menjadi 1,65. Perubahan standar parameter tersebut membuat moving material dari development jalan tambang Boboka berkurang secara signifikan sehingga waktu development jalan tambang Boboka dapat dipercepat. Selain itu, dengan berkurangnya moving material development jalan tambang Boboka, PT Antam Tbk UBP Nikel Maluku Utara dapat melakukan efisiensi. Kata kunci: jalan tambang, penelitian geoteknik, moving material. ABSTRACT In January 2018 PT. Antam Tbk UBP Nickel North Maluku, Tanjung Buli site, must continue the development of a production road called the Boboka mining road. The Boboka mine road must be used as a production road in July 2018 so that the production of the Tanjung Buli site is maintained. After the design is based on the standard mining road parameters and estimated development time, the Boboka mine road is estimated to be completed by the end of August 2018. For this reason, acceleration of the construction of the Boboka mine road must be made. After conducting geotechnical research, it is known that changes that can be made to the standard parameters of the Boboka mine road are adding height, berm width and overall slope angle. The changes are, the height of the level from 6 meters to 20 meters, berm width from 3 meters to 5 meters and the overall slope angle from 45⁰ to 55⁰. For a single slope angle there is no change that is 60⁰. From these changes an increase in FK values was obtained from 1,30 to 1,65. The change in standard parameters made the moving material from the development of the Boboka mine road significantly reduced so that the development time of the Boboka mine road could be accelerated. In addition, with the reduction in moving material development of the Boboka mine road, PT Antam Tbk UBP Nickel North Maluku can improve efficiency. Keywords: mining road, geotechnical research, moving material.

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Endriatno, Nanang, Budiman Sudia, Raden Rinova Sisworo, and Muhammad Faisal. "Dynamic Response at Various Points of Aluminum Cantilever Beam." International Journal of Engineering and Computer Science 9, no. 12 (December 7, 2020): 25260–64. http://dx.doi.org/10.18535/ijecs/v9i12.4546.

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The aim of the study was to analyze the dynamic response along an aluminum cantilever beam. The data measured were displacement (mm), velocity (mm / s), and acceleration (m/s2) with 3 variations of the measurement position on the beam. The 6061 series aluminum beam used have length: 80 cm, height: 32 cm, and width: 32 cm. Data were collected experimentally using a vibration meter to measure beam vibrations at the various positions from the cantilever beam at a distance from support: 10 cm, 35 cm, and 60 cm. The results of the analysis showed that the values of the displacement, velocity and acceleration of the object vibrations change when the measuring point was far from the cantilever support. The maximum displacement value is at 60 cm from the support: 0.02 mm, and the lowest is at 10 cm: 0.12 mm. The velocity value also increases, maximum at 60 cm from the support: 38.58 mm/s and the minimum value at 10 cm: 12.30 mm/s. While the acceleration value, the maximum at 60 cm from the support: 91150 mm/s2 and the minimum at 10 cm: 66900 mm/s2.

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Wang, Wen Yu, Xiao Bing Ma, Shi Hua Chang, and Rui Kang. "A Comparison of Two Accelerated Degradation Models with Temperature and Humidity as Accelerating Stresses." Applied Mechanics and Materials 300-301 (February 2013): 1162–70. http://dx.doi.org/10.4028/www.scientific.net/amm.300-301.1162.

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In this paper, a comparison of two kinds of acceleration models under temperature and humidity joint stress is given. The traditional generalized Arrhenius model and Eyring Model give two ways to describe the accelerated life of products. First, through some mathematical transformation and synthesizing of these two models we have concluded two acceleration models under temperature and humidity joint stress which are described in detail in this paper. Estimations of model parameters are also given. Secondly, by comparing accelerated life coefficient and coefficient of variations, we can take a glimpse of the models in their fitness of actual conditions. Then, since the models presented in this paper follow the features of nested models, a likelihood ratio test is conducted which takes a further step in the work of model selection. At last, these two models are compared through an application example – Smart Electricity Meter.

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Zhang, Fei, Shengyue Zong, Xiang Wang, and Xiaohuai Ren. "An Expert PI Controller with Dead Time Compensation of Monitor AGC in Hot Strip Mill." Mathematical Problems in Engineering 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/3041538.

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Hot strip rolling production is a high-speed process which requires high-speed control and communication system, but because of the long distance between the delivery stand of the finishing mill and the gauge meter, dead time occurs when strip is transported from the site of the actuator to another location where the gauge meter takes its reading, which seriously affects the thickness control effect. According to the process model which is developed based on the measured data, a filtered Smith predictor is applied to predict the thickness deviation of the finishing mill. At the same time, an expert PI controller based on feature information is proposed for the strip thinning during looper rising and coiler biting period and the strip thickening during the tension loss period of the strip tail end. As a result, the thickness accuracy has been improved by about 1.06% at a steady rolling speed and about 1.23% in acceleration and deceleration.

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AHMADI, SOFYAN, KHAIRUL ANAM, and WIDJONARKO WIDJONARKO. "Peningkatan Efisiensi Energi pada Kendaraan Listrik dengan Elektronik Diferensial Berbasis ANN (Artificial Neural Network)." ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika 8, no. 3 (August 27, 2020): 642. http://dx.doi.org/10.26760/elkomika.v8i3.642.

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ABSTRAKSeiring dengan perkembangan teknologi kendaraan listrik yang saat ini semakin canggih dan berkembang sangat cepat, upaya pengembangan kendaraan listrik terus dilakukan, salah satunya penggunaan motor BLDC dalam kendaraan listrik untuk meningkatkan efisiensi. Penelitian ini menggunakan kontrol ANN (Artificial Neural Network) pada mikrokontroler serta metode differential untuk pengontrolan kecepatan putar motor BLDC. Pengujian Percepatan dengan menempuh jarak 200 meter arus rata-rata sebesar 1,05 ampere. Daya rata-rata pada pengujian efisiensi sebesar 101 watt. Hasil efisiensi dari pengujian dengan panjang lintasan sejauh 3,3 km dengan waktu tempuh 10 menit didapatkan hasil efisiensi energi dari sistem kendaraan sebesar 179,34 km/kwh.Kata kunci: Motor BLDC, Elektronik Diferensial, Neural network-Logic, Akselerasi, Efisiensi. ABSTRACTAlong with the development of electric vehicle technology that is currently increasingly sophisticated and growing very fast. efforts to develop electric vehicles continue to be done, one of them the use of BLDC motor in electric vehicles to improve efficiency. In this study using ANN (Artificial Neural Network) control on the microcontroller as well as the differential method for controlling the rotational speed of the BLDC motor. Acceleration Testing with a distance of 200 meters average flow of 1.05 amperes. The average power on the 101 watt efficiency test. The efficiency of the test with the length of the track as far as 3.3 km with the travel time of 10 minutes obtained the efficiency of energy in the vehicle system of 179.34 km / kwh.Keywords: BLDC Motor, Electronic Differential, Neural network-Logic, Acceleration,Efficiency.

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Mandal, Debasish, and Dr Ashoke Kumar Biswas. "Compression of Elbow Angle between Tribal and Non-Tribal School Boys in Acceleration Phase during 100 Meter Sprinting." Journal of Advances in Sports and Physical Education 3, no. 10 (October 10, 2020): 187–92. http://dx.doi.org/10.36348/jaspe.2020.v03i10.003.

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Mandal, Debasish, and Dr Ashoke Kumar Biswas. "Compression of Elbow Angle between Tribal and Non-Tribal School Boys in Acceleration Phase during 100 Meter Sprinting." Journal of Advances in Sports and Physical Education 3, no. 10 (October 10, 2020): 187–92. http://dx.doi.org/10.36348/jaspe.2020.v03i10.003.

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Johnson, G. R. "The effectiveness of shock-absorbing insoles during normal walking." Prosthetics and Orthotics International 12, no. 2 (August 1988): 91–95. http://dx.doi.org/10.3109/03093648809078205.

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This paper describes a study of the effectiveness of commercially available shock absorbing insoles when used in four different pairs of shoes during normal walking. The measurement method was based on the use of the Fourier Transform of the axial acceleration of the leg measured by an accelerometer mounted at the ankle. The magnitude of shock was measured by the “Shock Factor” which has been defined as the rms acceleration between 50 Hz and 150 Hz expressed as a proportion of that between 10 Hz and 150 Hz. Nine insoles were tested in each pair of shoes and the Shock factor for each combination was compared with the value obtained for the shoes alone. Statistically significant reductions of Shock Factor were noted in 58% of cases; the largest improvement (30% reduction in Shock Factor) was achieved by lightweight Sorbothane. The experimental technique has now been further developed to allow the measurement of Shock Factor by a portable Shock Meter.

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Soheyli, Mohamad Reza, A. H. Akhaveissy, and S. M. Mirhosseini. "Large-Scale Experimental and Numerical Study of Blast Acceleration Created by Close-In Buried Explosion on Underground Tunnel Lining." Shock and Vibration 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/8918050.

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Despite growing demands for structures in water transportation tunnels, underground installations, subsurface dams, and subterranean channels, there is limited field knowledge about the dynamic behavior of these structures in the face of near-fault earthquakes or impulse excitations. This study conducted a large-scale test on underground tunnel excited by two close-in subsurface explosions. The horizontal and vertical acceleration were recorded on the vertical wall of the tunnel and the free field data including the acceleration on the ground surface at 11-meter distance from the tunnel. The frequency domain analysis of recorded results determined the frequency 961 Hz and 968 Hz for 1.69 kg and 2.76 kg equivalent T.N.T., respectively. Then, finite element analysis results were compared with the test data. The comparisons demonstrated a good correlation and satisfied the field data. Finally, based on numerical modeling, a parametric study was applied to determine the effects of shear wave velocity distance of the crater with respect to the tunnel on impulse response of the tunnel.

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Chen, Desheng, Baoling Cui, and Zuchao Zhu. "Numerical simulations for swirlmeter on flow fields and metrological performance." Transactions of the Institute of Measurement and Control 40, no. 4 (October 24, 2016): 1072–81. http://dx.doi.org/10.1177/0142331216673424.

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Measurements of flow rates of fluids are important in industrial applications. Swirlmeters (vortex precession meters) are widely used in the natural gas industry because of their advantage in having a large measurement range and strong output signal. In this study, using air as a working medium, computational fluid dynamics (CFD) simulations of a swirlmeter were conducted using the Reynolds-averaged Navier–Stokes (RANS) and renormalization group (RNG) k–ε turbulence models. The internal flow characteristics and the influence of the tube structure (geometric parameter of flow passage) on metrological performance were studied, with a particular focus on the meter factor. Calibration experiments were performed to validate the CFD predictions; the results show good agreement with those from simulations. From the streamline distributions, a clear vortex precession is found in the throat region. At the end of throat, the pressure fluctuation reached a maximum accompanied by the largest shift in the vortex core from the centreline. There exists a large reverse flow zone in the vortex core region in the convergent section. To mitigate the influence of reverse flow on vortex precession, a suitable length of throat is required. For a larger convergent angle, the fluid undergoes higher acceleration leading to an increase in velocity that produces more intensive pressure fluctuations. The minor diameter of the throat also produces a higher velocity and larger meter factor. Compared with both divergent angle and throat length, the convergent angle and throat diameter play a more important role in determining precession frequency.

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Morantz, D. L., S. E. Barbour, and R. K. Sweeney. "Source of Error in Water Velocity Measurement for Aquatic Studies." Canadian Journal of Fisheries and Aquatic Sciences 43, no. 4 (April 1, 1986): 893–96. http://dx.doi.org/10.1139/f86-111.

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Water velocity is an important component in aquatic studies but is subject to alteration by the presence of an underwater observer. Tests using two types of water velocity meter and a snorkeler showed the effects to be a function of the diver's distance from the probe. Lateral positions generally caused an acceleration of flow at the measurement point of up to 150%, while downstream positions resulted in a decrease in flow of up to 65%. It is recommended that where underwater observers are employed, they position instruments that can be read remotely and then move well away from the point of measurement.

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Taale, Alireza, Carlos E. Ventura, and Jose Marti. "On the feasibility of IoT-based smart meters for earthquake early warning." Earthquake Spectra 37, no. 3 (January 6, 2021): 2066–83. http://dx.doi.org/10.1177/8755293020981964.

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The microelectromechanical systems (MEMS) accelerometer built into a smart meter (SM) has a nominal digital resolution of 16 bits. However, this resolution collapses to 7 bits of information per sample when used in an urban environment. This collapse in resolution limits the sensitivity required to effectively operate the earthquake early warning platform (EEWP). In this study, we evaluate the performance of the MEMS sensor in present SMs with respect to a reference sensor, with a special focus on its poor noise power spectral density (PSD, [Formula: see text]). We also explore the general capacity of the SM in an IoT-based EEWP and provide explicit information regarding the 16-bit digital MEMS accelerometer. Then, we investigate the functionality of the sensor in the context of event detection in the presence of background vibration. When the value of acceleration root mean square (RMS) exceeds 20 mg, the meter’s error decreases to <20%, whereas the peak ground acceleration error decreases to <20% for the peak value greater than ~70 mg. The MEMS sensor is unreliable for motions with a peak acceleration of less than 148 mg or those with an RMS value less than 46 mg. However, we note that SMs exhibit reasonable amplitude and phase coherence for frequencies above 1 Hz with respect to the reference accelerometer. To enhance the sensitivity, averaging 1000 coherent accelerometer observations enhances the digital resolution to 14 bits, which allows the efficient usage of the network bandwidth. Since the accelerometer is used as an anti-tampering mechanism, the SM is similar to a tiltmeter. Therefore, it is necessary to reconfigure SMs for early warning systems. Despite the challenges, the use of SM for an IoT-based EEWP is technically feasible.

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Journal articles on the topic 'Acceleration meter'

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