Cycling Qualification Research Articles

Design of a novel grinding end-effector for spiral welded pipe

In the spiral welded pipe manufacturing process, grinding is one of the production processes, this process proceeds by hand grinding and fixed machine grinding. Usually, those methods have impacts larboard intensive, long production cycle and unstable product qualification rate for the final product. To prevent those factors from this paper, present a newly-designed grinding machine for a spiral welded pipe manufacturing industry, the machine has equipped with a special grinding machine with the ability to grind the spiral welded pipe the inner and outer surface simultaneously of the pipe and equipped with 6DOF grinding robot. The kinematics model of grinding robot is derived and the robot joint trajectory is calculated. The simulation result shows that the grinding mechanism can perform the job without failures under the external torque, and also trajectory graph of the robot kinematics shows there is no vibration on the robot movement to perform the job.

Research on Weapon Equipment Purchase Performance Evaluation Based on Support Vector Machine

In this paper, we present an efficient performance evaluation method of weapon equipment purchase based on support vector machine. Firstly, the concept of weapon equipment purchase performance evaluation was explained and the existing problems of weapon equipment purchase performance evaluation were analysed. Then, a 12-dimension performance evaluation indicator system was constructed (these dimensions are: budget progress, cost-benefit ratio, expenditures reduction rate, supplier satisfaction, purchaser satisfaction, customer satisfaction, purchase cycle rationality, qualification rate, price rationality, competition, success rate, and policy completeness). And lastly, a weapon equipment purchase performance evaluation model based on support vector machine was established, and a case analysis was conducted. The result provides a reference for building the indicator system and model for weapon equipment purchase performance evaluation and the research conclusion can help complete and improve the evaluation method.

Meningkatkan Pemahaman Siswa Terhadap Operasi Penjumlahan Bilangan Pecahan Dengan Menggunakan Gambar Luas Daerah Di Kelas IV SD Inpres Maccini Sombal Kota Makassar

This research is a class action that includes planning, implementation, obervation, and reflection. Data in the research are data activity and students learning outcomes in the addition fractions. Data obtained by obervation, testing, field notes which aims to improve understanding of the add fractions by using an image area of fourth grade students SD Inpres Maccini Sombala Makassar. The benefits of this research are (1) to provide direct experience of the ability of comprehensive applications of the use of the image area in an effort to improve the capability of addition fractions, (2) as an improvement of teaching on the subject of the addition fractions. The results of this research are the first cycle that (1) presenttasion on stage percentage in wide image the area is not maximized, (2) students has diffuculty in summing fractions, and (3) working group has not been maximized. While in the second cycle has that significant improvement; (1) presentation on stage percentage in wide image the area has a maximum running in accordance with the plan, (2) the students has mastered fractions addition operation using the image of area, and (3) students can work in groups optimally operate the sum fractions by using a wide image area. The improvement can be seen in the fisrt cycle qualifications less (K), the second cycle qualification of good (B). The conclusions of this research is to use the image in the area of learning fractions can enhance students undertanding fourth grade SD Inpress Maccini Sombala Makassar. Keyword: fractions, additions, wide of image the area

A protocol for space charge measurements in full-size HVDC extruded cables

This position paper, prepared by the IEEE DEIS HVDC Cable Systems Technical Committee, illustrates a protocol recommended for the measurement of space charges in full-size HVDC extruded cables during load cycle qualification tests (either prequalification load cycles or type test load cycles). The protocol accounts for the experimental practices of space charge measurements in the thick insulation of coaxial cables in terms of poling time, depolarization time, heating and cooling of specimens, as well as for the experience gained very recently from such kind of measurements performed in the framework of qualification tests relevant to ongoing HVDC cable system projects. The goal of the protocol is not checking the compliance with any maximum acceptable limit of either space charge or electric field. Rather, this protocol aims at assessing the variation of the electric field profile in the cable insulation wall during poling time at the beginning and at the end of load cycle qualification tests for full-size HVDC extruded cables. Indeed, in the design stage the electric field distributions are determined by the cable geometry and by temperature gradient in the insulation. Thus, the design is based on macroscopic parameters conductivity and permittivity and how they depend upon temperature. Any disturbance of the electric field due to space charge accumulation will only be revealed during space charge measurements either in as-manufactured state or in the aged state after load cycle qualification tests.

Qualification of Fiber Optic Cables for Martian Extreme Temperature Environments†

Thermal cycling qualification and verification (TCQV) of fiber optic cables (FOC) for the Mars Science Laboratory (MSL) flight project has been performed to enhance the mission assurance. The qualification of FOCs has been carried out to meet MSL project requirements. The FOCs were of significant interest in this study in that they survived three times (3×) the total number of expected thermal diurnal cycles resulting from all environmental and operation exposures occurring over the life of the flight hardware including all relevant ground operations and mission phases. Qualification was performed by subjecting FOC hardware to extreme temperature environments and assessing any structural failures or degradation in optical transmission due to overstress or thermal cycle fatigue. We are reporting the qualification results of FOCs for MSL project in this letter.

Qualification of Bonding Process of Temperature Sensors to Extreme Temperature Deep Space Missions**

A process has been explored based on state of the art technology to bond a platinum resistance thermometer (PRT) on potential aerospace materials such as a flat aluminum surface and a flexible copper tube to simulate coaxial cable for flight applications. Primarily, PRTs were inserted into a metal plated copper braid to avoid stresses on the sensor while attaching the sensor with braid to the base material for long duration deep space missions. Appropriate pretreatment has been implemented in this study to enhance the adhesion of the PRTs to the base material. The NuSil product was chosen in this research to attach the PRT to the base materials. The resistance (∼1.1 kΩ) of PRTs was continuously electrically monitored during the qualification thermal cycling testing from −150°C to +120°C and −100°C to −35°C. The test hardware was thermal cycled three times the mission life per JPL design principles for the JUNO project. No PRT failures were observed during and after the PRT thermal cycling qualification test for extreme temperature environments. However, there were some failures associated with staking of the PRT pigtails as a result of the thermal cycling qualification test.

Effects of Sodium Bicarbonate Ingestion on Performance and Perceptual Responses in a Laboratory-Simulated BMX Cycling Qualification Series

The objective of this study was to examine the effect of sodium bicarbonate (NaHCO3-) ingestion on performance and perceptual responses in a laboratory-simulated bicycle motocross (BMX) qualification series. Nine elite BMX riders volunteered to participate in this study. After familiarization, subjects undertook two trials involving repeated sprints (3 x Wingate tests [WTs] separated by 30 minutes of recovery; WT1, WT2, WT3). Ninety minutes before each trial, subjects ingested either NaHCO3- or placebo in a counterbalanced, randomly assigned, double-blind manner. Each trial was separated by 4 days. Performance variables of peak power, mean power, time to peak power, and fatigue index were calculated for each sprint. Ratings of perceived exertion were obtained after each sprint, and ratings of perceived readiness were obtained before each sprint. No significant differences were observed in performance variables between successive sprints or between trials. For the NaHCO3- trial, peak blood lactate during recovery was greater after WT2 (p < 0.05) and tended to be greater after WT3 (p = 0.07), and ratings of perceived exertion were not influenced. However, improved ratings of perceived readiness were observed before WT2 and WT3 (p < 0.05). In conclusion, NaHCO3- ingestion had no effect on performance and RPE during a series of three WT simulating a BMX qualification series, possibly because of the short duration of each effort and the long recovery time used between the three WTs. On the contrary, NaHCO3- ingestion improved perceived readiness before each WT.

Testing of the Mars Exploration Rovers to Survive the Extreme Thermal Environments

NASA's Mars Exploration Rover (MER) project involved delivering two mobile science laboratories (rovers) on the surface of Mars to remotely conduct geologic investigations, including characterization of a diversity of rocks and soils. The rovers were launched separately in 2003 and have been in operation on the surface of Mars since January 2004. The rovers underwent a comprehensive pre-launch environmental assurance program that included assembly/subsystem and system-level testing in the areas of dynamics, thermal, and electromagnetic (EMC), as well as venting/pressure, dust, radiation, and solid-particle (meteoroid, orbital debris) analyses. Due to the Martian diurnal cycles of extreme temperature swings, the susceptible hardware that were mounted outside of the thermal controlled zones also underwent thermal cycling qualification of their packaging designs and manufacturing processes. This paper summarizes the environmental assurance program for the MER project, with emphasis on the pre-launch thermal testing program for ensuring that the rover hardware would operate and survive the Mars surface temperature extremes. These test temperatures are compared with some of the Mars surface operational temperature measurements. Selected anomalies resulting from operating the rover hardware in the Mars extreme thermal environment are also presented.