Articoli di riviste: "Jacket control"

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Brade, Carly, Brian Dawson, Karen Wallman e Ted Polglaze. "Postexercise Cooling Rates in 2 Cooling Jackets". Journal of Athletic Training 45, n. 2 (1 marzo 2010): 164–69. http://dx.doi.org/10.4085/1062-6050-45.2.164.

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Abstract Context: Cooling jackets are a common method for removing stored heat accumulated during exercise. To date, the efficiency and practicality of different types of cooling jackets have received minimal investigation. Objective: To examine whether a cooling jacket containing a phase-change material (PC17) results in more rapid postexercise cooling than a gel cooling jacket and a no-jacket (control) condition. Design: Randomized, counterbalanced design with 3 experimental conditions. Setting: Participants exercised at 75% V˙o2max workload in a hot climate chamber (temperature = 35.0 ± 1.4°C, relative humidity = 52 ± 4%) for 30 minutes, followed by postexercise cooling for 30 minutes in cool laboratory conditions (ambient temperature = 24.9 ± 1.8°C, relative humidity = 39% ± 10%). Patients or Other Participants: Twelve physically active men (age = 21.3 ± 1.1 years, height = 182.7 ± 7.1 cm, body mass = 76.2 ± 9.5 kg, sum of 6 skinfolds = 50.5 ± 6.9 mm, body surface area = 1.98 ± 0.14 m2, V˙o2max = 49.0 ± 7.0 mL·kg−1·min−1) participated. Intervention(s): Three experimental conditions, consisting of a PC17 jacket, a gel jacket, and no jacket. Main Outcome Measure(s): Core temperature (TC), mean skin temperature (TSk), and TC cooling rate (°C/min). Results: Mean peak TC postexercise was 38.49 ± 0.42°C, 38.57 ± 0.41°C, and 38.55 ± 0.40°C for the PC17 jacket, gel jacket, and control conditions, respectively. No differences were observed in peak TC cooling rates among the PC17 jacket (0.038 ± 0.007°C/min), gel jacket (0.040 ± 0.009°C/min), and control (0.034 ± 0.010°C/min, P > .05) conditions. Between trials, no differences were calculated for mean TSk cooling. Conclusions: Similar cooling rates for all 3 conditions indicate that there is no benefit associated with wearing the PC17 or gel jacket.

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Widarti, Sri, Irma Galuh Rahayu e Sapto Prayogo. "Correlation of Steam Velocity and Pipe Diameter with Heat Transfer Performance on 120° Half-Pipe Jacket". Fluida 16, sp1 (31 ottobre 2023): 38–45. http://dx.doi.org/10.35313/fluida.v16isp1.5595.

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Double jacket mixing tanks offer temperature control and versatility for industrial processes where temperature-sensitive materials need to be mixed, stored, or processed. The selection of the appropriate jacket type in a double-jacket mixing tank is based on the structural strength and the optimal heat transfer performance. The type of jackets can be conventional, dimple, and half-pipe. The conventional jacket is easier to manufacture, but it is not resistant to high temperature and pressure. The dimple jacket has good heat transfer, but it is susceptible to damage. The half-pipe jacket has good structural strength, but its heat transfer is affected by the central angle and pipe diameter. 120° central angle has greater heat transfer and pressure drop than 180° central angle. In order to determine the effects of steam velocity on heat transfer performance, heating time, and pressure drop of the 120° half-pipe jacket, research occurred on pipes with 2, 2.5, and 3 inches of diameter. The calculating method of heat transfer in agitated jacketed vessels is applied to visualize the relationships. The effects of steam velocity on heat transfer, heating duration, and pressure drop respectively are polynomials of order 2, power, and polynomials of order 2 with an average R2 close to 1. The greater R2, the better the relationship between two variables, according to the equation. The 120° half-pipe jacket performance will be highly effective, with 1774 W, 2.1 minutes heating duration, 8.94 kPa pressure drop if the steam velocity is 10.50 m/s with 2.5 inches pipe diameter.

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Shcherbovskykh, Serhiy, Volodumur Bilas e Tetyana Stefanovych. "Reliability evaluation of wired tripled control channel for common, separate, and mixed cable jackets". Avtomatizacìâ virobničih procesìv u mašinobuduvannì ta priladobuduvannì 55 (2021): 15–24. http://dx.doi.org/10.23939/istcipa2021.55.015.

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Aim. To develop an approach for quantifying the reliability of the wired tripled control channel with common, mixed, and separate cable jackets. Method. Reliability is formalized using block diagrams and dynamic fault trees. Static and dynamic models have been developed to evaluate the reliability indicators of the wired control channel with triple redundancy. The basis for obtaining these models is the state and transitions diagram. Static models are formed using logical-probabilistic expressions. Dynamic models are based on the principles of Markov analysis. Results. For the core failure intensity, which is higher than the intensity of the cable jacket failure, it is shown that a separate cable jacket provides the highest reliability, and a common cable jacket provides the lowest. Accordingly, the mixed cable jacket in terms of reliability occupies an intermediate position with a slight approximation to the separate. Reliability indicators calculated from static models are understated in all three cases compared to those calculated from dynamic models. Although static models give less accuracy, they do not require the structure of sophisticated Markov models. Scientific novelty. The approach for modeling the reliability of control channels with triple core redundancy for cases of separate, mixed and common cable jackets has been improved. Practical significance. The proposed approach is recommended to be used to assess the reliability during the equipment design, the operation of which may endanger the life and health of service personnel. The obtained results are a mathematical basis for studying the reliability of a wired cable channel with three cores, which are protected by reinforcement and cable jacket in different combinations.

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Bin Abdullah, Muhammad Azfar, Mohamad Kamal A. Rahim, Noor Asmawati Samsuri, Mohd Fairus, Mohd Khairul Hisham Ismail e Huda A. Majid. "On human body transmission wearable diamond dipole antennas above engineered jackets". Indonesian Journal of Electrical Engineering and Computer Science 22, n. 3 (1 giugno 2021): 1513. http://dx.doi.org/10.11591/ijeecs.v22.i3.pp1513-1519.

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This paper presents the propagation of dual-band diamond dipole antenna on three various jackets. The jackets are purely fleece fabric with Shieldit fabric patches on top of it. The network analyzers with the flexible lossless coaxial cable are used to measure the communication of the antennas. The experiment involves a man with ideal body mass index (BMI) wearing the jackets by placing the flexible antennas on top of it. It is observed that the best on-body communication is by wearing the engineered jacket. The 10 dB improvements are observed when the antenna is positioned on top of engineered jacket contrast to the regular jacket. In other words, the performance of the antenna is also be determined by antenna placement. High transmission lossesses cause the antenna mismatch when the antennas are positioned above the full conductive jacket.

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M. Harini, K. S. Roshni, R. Nega e Dr. D. Nithya. "AI-Enabled Smart Jacket : Revolutionizing Healthcare Monitoring and Environmental Control". International Journal of Scientific Research in Computer Science, Engineering and Information Technology 10, n. 3 (4 maggio 2024): 45–54. http://dx.doi.org/10.32628/cseit24102132.

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The AI smart jacket represents a groundbreaking innovation in healthcare monitoring, merging wearable technology, advanced sensors, and machine learning algorithms. This wearable device integrates GPS and biometric sensors for real-time data capture, facilitating remote access to health metrics via wireless networking. With a focus on user comfort and privacy, the jacket features machine-washable fabrics and robust security measures. Its array of functionalities includes temperature adjustment, SOS capability, oximeter, ECG monitoring, pulse rate tracking, and a fan with massage functions. The jacket's versatility extends from chronic illness management to elderly care, promising to enhance overall well-being and quality of life. By seamlessly integrating technology into daily life, the AI smart jacket stands as a pioneering solution at the forefront of healthcare innovation.

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Han, Shao Ning, Hong Wang, Hang Wu, Pi Song Sun, Yu Hui Xue, Rui Meng e Hui Zhang. "Planning and Control in Construction of LW3-1 Jacket". Applied Mechanics and Materials 467 (dicembre 2013): 277–81. http://dx.doi.org/10.4028/www.scientific.net/amm.467.277.

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According to Chinese traditional classification, large-sized jackets weight over 10,000 tons and stand in over 100-meter water. Large-sized jackets are different from the normal in construction tonnage, structural dimension and quality control requirements as well as construction difficulty. More complicated construction technology and programme, higher grade of materials, stricter control requirements on node weld and higher risks all need matched stricter, more meticulous and more comprehensive management in planning and scheduling. Combined with construction of LW3-1 deep-water jacket, this paper describes the planning, tracking progress, process control and optimization.

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Mahmood, Abir, A. B. M. A. Kaish, Taghreed Khaleefa Mohammed Mohammed Ali, Ahmed W. Al Zand, Maslina Jamil e Roszilah Hamid. "Prefabricated Ferrocement Jacket for Repairing and Strengthening Axially Loaded Square Sub-Standard Concrete Stub Columns". Buildings 13, n. 10 (29 settembre 2023): 2484. http://dx.doi.org/10.3390/buildings13102484.

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For decades, ferrocement has been used to repair, strengthen, and even build structural components because it is a long-lasting and reasonably priced material. However, onsite ferrocement jacketing is time-consuming and labour-intensive. Alternatively, prefabricated ferrocement jacket installation eliminates these shortcomings. Therefore, this study utilises wearable prefabricated ferrocement jackets to repair and strengthen axially loaded sub-standard low-strength concrete elements. In order to repair cracked specimens and strengthen existing intact specimens, two types of wearable prefabricated jackets are proposed, ‘L’ shape and ‘U’ shape. Besides a control specimen, two preloaded and two unloaded square concrete specimens were utilised to repair and strengthen using the Prefabricated Ferrocement Jacketing system. The test results and crack patterns show that all the jacketed specimens performed better than the control specimens in terms of load-bearing capacity, ultimate axial and lateral deflection, and ductility. In terms of load-bearing capacity, the unloaded strengthened specimens showed significant results consistently. Based on the results, the proposed solutions were found to be effective in solving the problem of typical square ferrocement jackets.

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Rutherford, Naomi H., Alan W. Gordon, Gareth Arnott e Francis O. Lively. "The effect of calf jackets on the health, performance, and skin temperature of dairy origin beef calves". Translational Animal Science 4, n. 1 (7 novembre 2019): 316–23. http://dx.doi.org/10.1093/tas/txz172.

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Abstract Variations and extremities in climatic conditions can result in cold stress for dairy calves during the preweaning period. The objective of this study was to investigate the effect of calf jackets on the health, performance, and skin temperature of dairy-origin beef calves. This study took place in a designated calf rearing unit, spanned for a duration of 1 yr, and consisted of five batches of calves. Calves (30.9 ± 1.68 d of age; 55.9 ± 0.20 kg live weight) were assigned to one of four treatment groups on arrival at the rearing unit. Treatments consisted of control (no jacket), arrival (jacket for 2 wk postarrival), weight (jacket for a minimum of 2 wk and until 65 kg live weight), and wean (jacket until 5 d postweaning). Ambient conditions differed significantly (P < 0.001) during each of the five batches; batch 4 was the coldest with a mean ambient temperature of 6.16 °C. Significant differences were observed between the five batches for day 50 weight (P < 0.01) and disease incidence (P < 0.05). However, treatment had no significant effect on calf health or performance (P > 0.05) during any of the five batches. Skin temperature was significantly greater (P < 0.001) for calves wearing a jacket. Furthermore, there was a significant (P < 0.001) relationship between ambient temperature-humidity index and skin temperature for calves with and without a calf jacket. Therefore, although calf jackets had no benefit in terms of health or performance, they did act as a barrier to environmental conditions.

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Bhaskara, Thabliq Basac, Muhammad Daud e Selamat Meliala. "Design of Temperature Monitoring and Stabilization System Based on Microcontroller for Outdoor Jacket in Cold Regions". Proceedings of Malikussaleh International Conference on Multidisciplinary Studies (MICoMS) 4 (20 dicembre 2024): 00033. https://doi.org/10.29103/micoms.v4i.966.

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The design of a temperature monitoring and stabilization system on a microcontroller based cold region outdoor jacket by utilizing microcontroller technology, by ensuring user comfort while in a cold temperature environment. This research is shown specifically in cold areas, with the aim of preventing hypothermia commonly experienced by climbers or humans, who are active in cold areas. The results of the system research on outdoor jackets that can monitor and stabilize the user's body temperature automatically, especially in cold areas. This system uses an ESP32 microcontroller, which is equipped with the Blynk application to control and monitor temperature using a smartphone. When the ambient temperature drops below 20°C, the system automatically activates the carbon fiber heating pad to maintain a stable body temperature. The jacket is designed to function offline, where the system will rely on the temperature sensor to activate the carbon fibre heating pad if the temperature drops below 20°C. Test results show that the system works well, providing efficient results in power consumption, responsive to temperature changes, and effective in maintaining temperature stability. The resulting jacket is comfortable and safe so that it does not interfere with outdoor jacket users in various conditions.

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Feng, Hua-Nv, Bao-Lin Zhang, Qing Li e Gong-You Tang. "Delayed Fuzzy Output Feedback H∞ Control for Offshore Structures". Journal of Marine Science and Engineering 8, n. 6 (12 giugno 2020): 434. http://dx.doi.org/10.3390/jmse8060434.

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Vibration damping of jacket platforms is among the significant issues in marine science and engineering, and the design of active vibration control schemes is very important to ensure the stability and safety of the jacket platforms against external loadings. This paper provides three fuzzy output feedback H ∞ controllers of the jacket platforms for irregular wave forces. By considering time-varying masses of jacket platforms, a Takagi-Sugeno (T-S) fuzzy dynamic model of the structure is established. Then fuzzy output feedback H ∞ control schemes are developed via using output signals of the platform with current and/or are delayed. Several existence conditions of fuzzy output feedback H ∞ controllers are derived. Simulation results demonstrate that the fuzzy output feedback H ∞ control strategies are remarkable to suppress the vibration of structure. Moreover, by choosing proper delayed output information of the system, the presented delayed fuzzy output feedback H ∞ control schemes outperform the conventional fuzzy output feedback H ∞ control approach.

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Gu, Jun, Yuan Qiang Xu e Jing Jing Zhou. "Failure Analysis of Early Fracture for Diesel Engine Cylinder Liner". Advanced Materials Research 461 (febbraio 2012): 177–81. http://dx.doi.org/10.4028/www.scientific.net/amr.461.177.

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This article, through the cylinder jacket break phenomenon which occurs to the diesel engine early time carries on the failure analysis, suggests that the cylinder jacket material ingredient control is lax, causes the cylinder jacket material brittleness to be oversized, the tool escape acute angle is the cylinder jacket break primary cause, and proposes corresponding regulatory measures prevent the cylinder jacket early tithe break.

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Chen, Sheng, Mingxin Li, Yankun Liu e Xu Bai. "Data-Driven Approach to Safety Control in Jacket-Launching Installation Operations". Journal of Marine Science and Engineering 13, n. 3 (13 marzo 2025): 554. https://doi.org/10.3390/jmse13030554.

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Installing offshore wind jackets faces increasing risks from dynamic marine conditions and is challenged by trajectory deviations due to coupled hydrodynamic and environmental factors. To address the limitations of software, such as long simulation times and tedious parameter adjustments, this study develops a rapid prediction model combining Radial Basis Function (RBF) and Backpropagation (BP) neural networks. The model is enhanced by incorporating both numerical simulation data and real-world measurement data from the launching operation. The real-world data, including the barge attitude before launching, jacket weight distribution, and actual environmental conditions, are used to refine the model and guide the development of a fully parameterized adaptive controller. This controller adjusts in real time, with its performance validated against simulation results. A case study from the Pearl River Mouth Basin was conducted, where datasets—capturing termination time, six-degrees-of-freedom motion data for the barge and jacket, and actual environmental conditions—were collected and integrated into the RBF and BP models. Numerical models also revealed that wind and wave conditions significantly affected lateral displacement and rollover risks, with certain directions leading to heightened operational challenges. On the other hand, operations under more stable environmental conditions were found to be safer, although precautions were still necessary under strong environmental loads to prevent collisions between the jacket and the barge. This approach successfully reduces weather-dependent operational delays and structural load peaks. Hydrodynamic analysis highlights the importance of directional strategies in minimizing environmental impacts. The model’s efficiency, requiring a fraction of the time compared to traditional methods, makes it suitable for real-time applications. Overall, this method provides a scalable solution to enhance the resilience of marine operations in renewable energy projects, offering both computational efficiency and high predictive accuracy.

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Silva, Adriana Correia da, e Michael Muskulus. "VAWT support structure mass sensitivity due to aerodynamic load scaling". Journal of Physics: Conference Series 2626, n. 1 (1 ottobre 2023): 012003. http://dx.doi.org/10.1088/1742-6596/2626/1/012003.

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Abstract The X-rotor wind turbine is an X-shaped hybrid vertical axis wind turbine whose power take-off is done by horizontal axis rotors located at the tip of the lower blades. Based on an initial basic study, the present study developed a preliminary jacket design as the turbine support structure. Steady aerodynamic loads were obtained from an actuator cylinder model and dynamic load simulations including wave loads were performed. The structure was checked according to fatigue damage and maximum yielding for representative site-specific load cases for fatigue and ultimate limit states. Even though the use of a conventional jacket was shown to be feasible for the new turbine concept, the overall mass of the support structure obtained by the higher fidelity model was higher than the initial prediction. The design was driven by the fatigue damage, caused by large cyclical loads on every rotor rotation. The effect of a hypothetical aerodynamic load reduction on the jacket mass was investigated. The developed design methodology was also applied to the design of equivalent jackets after a load reduction of 75% and 50% and the mass of the structure was shown to be sensible, with a respective reduction of 25% and 48%. This result demonstrates that different design strategies that influence the magnitude of the aerodynamic loads (e.g. the control strategy) could lead to a more cost-efficient jacket design.

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Patil, K. C., e R. S. Jangid. "Passive control of offshore jacket platforms". Ocean Engineering 32, n. 16 (novembre 2005): 1933–49. http://dx.doi.org/10.1016/j.oceaneng.2005.01.002.

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Benzel, Edward C., Theresa A. Hadden e Carla M. Saulsbery. "A comparison of the Minerva and halo jackets for stabilization of the cervical spine". Journal of Neurosurgery 70, n. 3 (marzo 1989): 411–14. http://dx.doi.org/10.3171/jns.1989.70.3.0411.

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✓ The motion at each intervertebral level permitted by the halo jacket and the thermoplastic Minerva body jacket was compared in 10 ambulatory patients with an unstable cervical spine. The thermoplastic Minerva body jacket is a new lightweight modification of a Minerva jacket which is fabricated from Polyform (a splinting material made of a polyester polycaprolactone) and Polycushion (a closed-cell foam for padding). Each patient served as his/her own control. The average movement from flexion to extension at each intervertebral level was significantly less in the thermoplastic Minerva body jacket (2.3° ± 1.7°) than in the halo jacket (3.7° ± 3.1°) (p < 0.0025). This difference is attributable to the “snaking phenomenon” encountered with halo jacket immobilization and should be taken into account when considering an external splint for an unstable cervical spine. The thermoplastic Minerva body jacket also offered a substantial improvement in comfort for the patient over that experienced in the halo jacket. The apparent advantage with respect to stability and comfort of the thermoplastic Minerva body jacket over the halo jacket suggests that the former device is the orthosis of choice for ambulatory stabilization of most patients with an unstable posttraumatic cervical spine injury.

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K, Harishmurthy. "Smart Military Jacket". International Journal for Research in Applied Science and Engineering Technology 9, n. VI (30 giugno 2021): 4363–66. http://dx.doi.org/10.22214/ijraset.2021.35967.

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In context to the national security, military personnel are involved in treacherous environment. Situations involving reconnaissance, espionage, border warfare, border security force etc. Soldiers toil in different terrains due to which their body temperature changes. Hence to tackle this problem, “SMART MILITARY JACKET” can be implemented. This system will be useful for soldiers who involve in special operations or missions. The data is obtained by providing certain threshold value. This data should be sent to the central command or the base, so the medium used here is GSM (Global system for mobile).Body temperature of a soldier is monitored with the help of a temperature sensor. Heartbeat of the soldier can be monitored by using a pulse sensor. The system also consists of some extra features using which the soldier can ask for a help by sending a distress signal to the military if he is in danger. A GPS tracking system is also attached to the jacket which helps in tracking the position of the soldier. This may help the control station to know about the soldier’s location in real-time. To monitor the system, a control unit called ARDUINO is used. Hence this project aims at implementing the basic lifeguarding system for soldier in low cost and high reliability.

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Kashid, Dr Pratibha, Rahul Kakade, Ashish Avhad, Shruti Karpe e Poorva Shinde. "Women's Safety Jacket". INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 07, n. 11 (1 novembre 2023): 1–11. http://dx.doi.org/10.55041/ijsrem26755.

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This project is all about creating a special jacket designed to enhance women's safety. In today's world, women often feel vulnerable and concerned about their well-being, especially when they're out alone or in unfamiliar surroundings. To address this issue, we have developed a smart jacket equipped with features like GPS, a distress signal, a camera, and a shock function. All of these components are controlled by a small computer called ESP 32. The primary goal of this project is to make women feel safer and more in control of their personal security. If a woman ever finds herself in an unsafe situation, she can use the jacket to send her location to the police, her family, or trusted contacts. The jacket also includes a loud alarm to alert people nearby. In case of a physical threat, the jacket can deliver a shock to deter potential attackers and simultaneously capture an image of the person for possible identification. Our project demonstrates that this innovative jacket can provide a practical and reliable solution for women's safety concerns. We envision a future where such technology can be further expanded to safeguard other vulnerable groups and individuals, making the world a safer place for everyone. Key Words: Women's Safety, Smart Jacket, GPS Technology, Distress Signal, Personal Security, ESP 32 Control

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Abdel-Rohman, Mohamed. "Structural control of a steel jacket platform". Structural Engineering and Mechanics 4, n. 2 (25 marzo 1996): 125–38. http://dx.doi.org/10.12989/sem.1996.4.2.125.

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Tusset, Angelo, Danilo Inacio, Maria Fuziki, Priscilla Costa e Giane Lenzi. "Dynamic Analysis and Control for a Bioreactor in Fractional Order". Symmetry 14, n. 8 (4 agosto 2022): 1609. http://dx.doi.org/10.3390/sym14081609.

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In this paper, a mathematical model was developed to describe the dynamic behavior of a bioreactor in which a fermentation process takes place. The analysis took into account the bioreactor temperature controlled by the refrigerant fluid flow through the reactor jacket. An optimal LQR control acting in the water flow through a jacket was used in order to maintain the reactor temperature during the process. For the control design, a reduced-order model of the system was considered. Given the heat transfer asymmetry observed in reactors, a model considering the fractional order heat exchange between the reactor and the jacket using the Riemann–Liouville differential operators was proposed. The numerical simulation demonstrated that the proposed control was efficient in maintaining the temperature at the desired levels and was robust for disturbances in the inlet temperature reactor. Additionally, the proposed control proved to be easy to apply in real life, bypassing the singularity problem and the difficulty of initial conditions for real applications that can be observed when considering Riemann–Liouville differential operators.

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Arao, Masaki, Toshihiro Tashima e Shigeyasu Kawaji. "Flexible Intelligence Machine Control and its Application to Jacket Tank Temperature Control". Journal of Robotics and Mechatronics 12, n. 6 (20 dicembre 2000): 650–55. http://dx.doi.org/10.20965/jrm.2000.p0650.

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In this paper, we propose a generic concept of flexible intelligence machine control (FIMC) which has a hierarchical structure and two functions: knowledge acquisition and adaptive learning. We show a practical example of FIMC applied to temperature control on an actual Jacket tank in polymerization process.

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Muškinja, Nenad, Matej Rižnar e Marjan Golob. "Optimized Fuzzy Logic Control System for Diver’s Automatic Buoyancy Control Device". Mathematics 11, n. 1 (21 dicembre 2022): 22. http://dx.doi.org/10.3390/math11010022.

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In this article, the design of a fuzzy logic control system (FLCS) in combination with multi-objective optimization for diver’s buoyancy control device (BCD) is presented. To either change or maintain the depth, the diver manually controls two pneumatic valves that are mounted on the inflatable diving jacket. This task can be very difficult, especially in specific diving circumstances such as poor visibility, safety stop procedures or critical life functions of the diver. The implemented BCD hardware automatically controls the diver’s depth by inflating or deflating the diver’s jacket with two electro-pneumatic valves. The FLCS in combination with the multi-objective optimization was used to minimize control error and simultaneously ensure minimal air supply consumption of the BCD. The diver’s vertical velocity is also critical, especially while the diver is ascending during the decompression procedure; therefore, a combination of depth and vertical velocity control was configured as a cascaded controller setup with outer proportional depth and inner FLCS vertical velocity control loops. The optimization of the FLCS parameters was achieved with differential evolution global optimum search algorithm. The results obtained were compared with the optimized cascaded position and velocity PID controller in simulations.

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Sucipto, Muhamad Anang, Adi Winarno e Mohammad ilham. "SMART JACKET PROTOTYPE FOR ONLINE OJEK DRIVERS BASED ON THE INTERNET OF THINGS (IOT) IN SURABAYA CITY". BEST : Journal of Applied Electrical, Science, & Technology 6, n. 2 (30 ottobre 2024): 1–4. http://dx.doi.org/10.36456/best.vol6.no2.9441.

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The research aims to design an automatic cooling jacket based on the Internet of Things (smart jacket) that can be used when riding motorbikes, including online motorcycle taxis. The methods used in this research include user needs analysis, system design, prototypes, and fan speed performance testing. In the user needs analysis stage, a survey was conducted among motorcyclists to identify problems faced when riding in hot weather conditions. Next, a system design consisting of a temperature sensor and an IoT communication module was carried out. After designing the system, an automatic cooling jacket prototype was developed. This prototype is equipped with a temperature sensor that will detect the rider's body temperature level, and an IoT communication module to allow users to control the jacket via an application on a smartphone. The results of this research show that an IoT-based automatic cooling jacket can effectively reduce the body temperature of motorcyclists when riding in hot weather. In speed performance testing, this jacket succeeded in reducing the rider's body temperature efficiently. This research is expected to contribute to the development of wearable technology that can increase comfort and safety for motorcyclists. Apart from that, this research can also be the basis for developing IoT-based automatic cooling jacket products that can be mass-produced and sold on the market. Keywords: jacket, fan cooling, IOT, motorbike, temperature sensor.

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ZHANG, B. L., e Y. M. XU. "DELAYED FUZZY CONTROL OF OFFSHORE STEEL JACKET PLATFORMS". ANZIAM Journal 58, n. 3-4 (aprile 2017): 446–54. http://dx.doi.org/10.1017/s1446181117000128.

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We study a delayed fuzzy $H_{\infty }$ control problem for an offshore platform under external wave forces. First, by considering perturbations of the masses of the platform and an active mass damper, a Takagi–Sugeno fuzzy model is established. Then, by introducing time delays into the control channel, a delayed fuzzy state feedback $H_{\infty }$ controller is designed. Simulation results show that the delayed fuzzy state feedback $H_{\infty }$ controller can reduce vibration amplitudes of the offshore platform and can save control cost significantly.

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Gee, Douglas A., e W. Fred Ramirez. "Optimal temperature control of jacket-cooled fermentation reactors". Optimal Control Applications and Methods 12, n. 1 (gennaio 1991): 49–62. http://dx.doi.org/10.1002/oca.4660120105.

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Yazici, Hakan, e Mert Sever. "Design of an optimal state derivative feedback LQR controller and its application to an offshore steel jacket platform". An International Journal of Optimization and Control: Theories & Applications (IJOCTA) 8, n. 1 (25 dicembre 2017): 84–91. http://dx.doi.org/10.11121/ijocta.01.2018.00468.

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This paper concerns with the optimal state derivative feedback LQR controller design for vibration control of an offshore steel jacket platform having active tuned mass damper against the wave induced disturbances. Considering that the state derivative signals such as acceleration and velocity are easier to measure rather than the state variables such as displacement, state derivative feedback control strategy is proposed to obtain practically applicable and easily realizable synthesis method. On the basis of convex optimization approach, state derivative feedback LQR controller design is formulated in Linear Matrix Inequalities (LMIs) form to get an optimal feasible solution set. Finally, an offshore steel jacket platform subject to nonlinear self excited wave force is used to illustrate the effectiveness of the proposed approach through simulations. The results show that proposed state derivative LQR controller is very effective in reducing vibration amplitudes of each floor of modeled offshore steel jacket platform and achieves compitable control performance to classical LQR controller design.

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F. Ojaimi, Mohammed. "Experimental Study on Shear Strengthening of Reinforced Concrete Beams Using Different Techniques of Concrete Jacketing". Basrah journal of engineering science 21, n. 2 (1 giugno 2021): 53–61. http://dx.doi.org/10.33971/bjes.21.2.8.

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A large number of RC structures or at least some of their members need strengthening or rehabilitation. Among the typical failure modes, the shear failure is more dangerous and less predictable, because of usually brittle behavior and sudden collapse. Therefore, there are necessities for upgrading the shear capacity and the local ductility of reinforced concrete beams. In this study, four different techniques of concrete jacketing were used to improve the behaviors of the shear deficiencies beams. The four techniques used in this study to enhance the behavior of the beams were by using a Self-Compacted Fiber Reinforced Concrete jacket without stirrups (S.-J. + Steel Fiber), a concrete jacket of Self Compacted Concrete with stirrups (S.-J. + Stirrups), a concrete jacket of ferrocement jacket (S.-J. + Ferrocement), and a concrete jacket of ferrocement jacket with external steel reinforcing bars (S.-J. + Ferrocement + R). These techniques contributed to enhancing the load-carrying capacity and delaying the appearance of the first crack in tested beams compared with the control beam by a percentage of (35, 59, 30, 6) % and (18, 35, 81, 80) %, respectively. The specimen (S.-J. + Stirrups) showed the best performance in comparison with the other used strengthening techniques used in this study in terms of stiffness and the ultimate load-carrying capacity. The ferrocement jacket (S.-J. + Ferrocement) was found to be the most suitable jacketing system used to enhance the shear capacity in terms of cracking load.

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Tolchinsky, Yu, V. Ved e I. Rofe-Beketova. "THERMAL CONTROL OF MECHANOCHEMICAL REACTION". Integrated Technologies and Energy Saving, n. 2 (4 novembre 2021): 3–10. http://dx.doi.org/10.20998/2078-5364.2021.2.01.

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Mechanochemistry studies and explains the processes of chemical and physicochemical transformations that are generated by mechanical action on a substance. When carrying out deep mechanochemical transformations, as a rule, it is necessary to transfer to solid reagents a portion of energy comparable to the energy of interatomic bonds. For this, various machines and apparatus are used, such as extruders, in which mechanical energy is constantly transferred to the crushed material. The article discusses the interaction of two reagents in a simple chemical reaction in the state of a mixture of particles of two types, which occurs during compression of particles having a rough irregular shape, and colliding with each other, forming areas of contact. Significant stress concentrations and heating of the substance with the formation of a new phase arise in these regions. Thermal control of the mechanochemical reaction is to maintain an optimal balance of dissipative heat and heat from the coolant in the worm reactor so that the rate of flow and the final product of the reaction meet the specified specifications. The formulas provided in the article for calculating the coefficient of the rate of mechanochemical reaction, heat transfer between worm reactor and jacket channel, heat exchange between jacket and environment allows to calculate the balance conditions for thermal management. The block diagram of the technological line, which is presented in the article, is more economical in comparison with carrying out the same reaction in a solvent. The economic benefit lies in the elimination of the steps of introducing and removing the solvent from the reaction product. At the end, it is indicated that the mechanochemical reaction of the transformation of a mixture of two dispersed materials consisting of solid particles into a liquid can be realized in continuous conditions in a flow mode in a worm machine. And thermal control of the course of a mechanochemical reaction can be carried out using controlled heat exchange with a coolant in a jacket under conditions of turn-around spatial dispersion.

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28

Ahmadov, Ya E., I. G. Huseynov, Sh I. Mustafayev e A. T. Ismailova. "Method of immediate control on technical state of offshore facilities". Azerbaijan Oil Industry, n. 10 (15 ottobre 2022): 29–35. http://dx.doi.org/10.37474/0365-8554/2022-10-29-35.

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A method of immediate estimation of technical state and possibilities of further operation of offshore oil-gas hydrotechnical facilities is suggested. Predictive capability of suggested technique is described through the implementation on the structure of a specific deep-water jacket in “Guneshli” field.

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29

Zhang, Bao-Lin, Qing-Long Han, Xian-Ming Zhang e Xinghuo Yu. "Integral sliding mode control for offshore steel jacket platforms". Journal of Sound and Vibration 331, n. 14 (luglio 2012): 3271–85. http://dx.doi.org/10.1016/j.jsv.2012.03.006.

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30

Terro, M. J., M. S. Mahmoud e M. Abdel-Rohman. "Multi-loop feedback control of offshore steel jacket platforms". Computers & Structures 70, n. 2 (gennaio 1999): 185–202. http://dx.doi.org/10.1016/s0045-7949(98)00152-7.

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31

Zhang, Bao-Lin, Zhihui Cai, Shouwan Gao e Gong-You Tang. "Delayed proportional-integral control for offshore steel jacket platforms". Journal of the Franklin Institute 356, n. 12 (agosto 2019): 6373–87. http://dx.doi.org/10.1016/j.jfranklin.2019.03.030.

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32

Mohite, Prof T. H. "Advanced Jacket for Military Defense and Social Welfare". International Journal for Research in Applied Science and Engineering Technology 10, n. 6 (30 giugno 2022): 2653–55. http://dx.doi.org/10.22214/ijraset.2022.44462.

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Abstract: As the climatic conditions are changing rapidly, the winters are getting much colder, especially in northern region and the western region of India. Since we developed a smart army jacket using control media devices such as, GPS, SENSORS in the jacket. The smart army jacket aims for providing reliable health monitoring as well as position tracking of soldier. Some of climatically conditions are led to unfortunate deaths of soldiers. This jacket can automatically sense the temperature inside, outside using temperature sensors. We are using coils for heating purpose and the temperature of the coil will depends on the outer temperature. GPS, the models used for communication purpose. Hence for monitoring the health and the heart rate of the soldier health monitoring equipment sensors are been establish in the jacket as well. In enemy territory soldiers not only have to deal with the physical threat, but also with stress and fatigue caused by protracted operations or lack of sleep. so for the security purpose we need a tool for remote soldier performance and health monitoring. so in this project a tool are implemented using bio medical sensors like heartbeat sensor, temperature sensor for health monitoring purpose by using the microcontroller.

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33

Tyas, Tiara Cahyaning, e Ida Giyanti. "Quality control of garment product using DMAIC Six Sigma". OPSI 17, n. 1 (30 giugno 2024): 234. http://dx.doi.org/10.31315/opsi.v17i1.7107.

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Quality control is intended to ensure that the products are in accordance with the predefined standards. PT. XYZ is a garment company that manufactures products with global target market. Hence, product quality assurance becomes an important issue for PT. XYZ. This research focuses on the Just Brand-MCJA216142 jacket product at the sewing work station on line-4 of PT. XYZ. Preliminary observations show that the number of reworked-products was experiencing an increasing trend. This study aims to determine whether the company has carried out quality control properly. Specifically, the research objectives are to identify the type and level of product defects, identify the factors causing product defects, and provide proper improvement suggestions to reduce the occurrence of product defects. This study applied DMAIC (Define–Measure–Analyze–Improve–Control) Six Sigma concept. The results showed that the quality of the Just Brand-MCJA216142 jacket product has exceeded the Indonesian industry average and is classified as the USA industry average. However, quality improvement is still needed since the products are targeted for the export market. Based on Pareto diagram at the Analyze stage, it was found that the most dominant defects occurred in the Just Brand-MCJA216142 jacket production process were broken threads and puckering. The frequency of occurrence for these two types of defect reaches 23% of the total 16 types of defects. The defects were caused by human, machine, material, method, and environmental factors. Recommendations for improvement at the Improve stage are based on root cause analysis of each causative factor that is identified using a fishbone diagram. This research results strengthen the previous related researches regarding the effectivity of DMAIC Six Sigma for analyzing quality control of products.

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34

Kumagai, Seiji, Naoki Sato e Koichi Takeda. "Automatic Stripping of Dielectric-Encased Wire Tool Electrode Used in Electrical Discharge Machining". Journal of Manufacturing Science and Engineering 129, n. 5 (2 febbraio 2007): 973–78. http://dx.doi.org/10.1115/1.2738541.

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A new electrical discharge machining (EDM) system using a wire encased in a dielectric jacket is proposed as an alternative to conventional hole-fabrication EDM systems. The jacket suppresses secondary discharges occurring between the sidewalls of the wire and the fabricated hole, which allows fabrication of holes with higher aspect ratios compared to those formed by a conventional EDM system using naked pipe electrodes. In this new system, the tip of the wire electrode is stripped by displacing the jacket, which produces continuous sparks for workpiece erosion and keeps the bore and shape of the fabricated holes constant. In the present study, we developed a control system to maintain the exposed length of the tip without the need for visual observation and without the assumption that wear is constant over time. The exposed length of the tip of the wire electrode is related to the feed speed (toward the workpiece) of the electrode system. The jacket was displaced when the feed speed of the electrode system exceeded a threshold value, which resulted in slowing of the electrode system feed. The feed speed was kept within the specified range by determining a threshold value, which led to maintenance of a constant exposed length of the tip. This control system was validated in actual drilling tests. Optimizing the threshold feed speed contributed to a higher machining speed.

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35

Yang, Feng Yan, Shu Min Li, Zheng Rong Song, Tui Deng e Ming Wang Yang. "Repair Method for Overheated Areas in the Liwan3-1 Jacket Members". Applied Mechanics and Materials 328 (giugno 2013): 203–7. http://dx.doi.org/10.4028/www.scientific.net/amm.328.203.

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LW3-1 CEP(Central Processing Platform) jacket ranks fifth heaviest jacket in the world and the heaviest in the Asia. Some of members were overheated due to improper temperature control in the PWHT process during the fabrication of the tubular members. To evaluate the impact of overheating to the member performance, a series of evaluation experiments were performed for the overheating members and repair work was conducted to replace damaged area of members. This paper summarizes the evaluating experiments result and the repair procedures for the areas which were overheated in the PWHT(Post Weld Heat Treatment) process during the fabrication of the LW3-1 jacket. The proposed repairs meet the project requirements for both strength and fatigue requirement. This paper presents the experiences which may benefit future applications.

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36

Jeon, Kyunghun, Myungwoo Park, Jongjin Park, Hongjun Choi, Ki-Deok Lee, Jeong-Jong Lee e Chang-Wan Kim. "Analysis of Cooling Characteristics of Permanent Magnet Synchronous Motor with Different Water Jacket Design Using Electromagnetic–Thermal Fluid Coupled Analysis and Design of Experiment". Machines 11, n. 9 (11 settembre 2023): 903. http://dx.doi.org/10.3390/machines11090903.

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Electrical losses are converted into thermal energy in motors, which heats each component. It is a significant factor in decreasing motor mechanical performance. In this paper, the motor cooling characteristics were analyzed according to the design factors of the water jacket to investigate the cooling performance of a permanent magnet synchronous motor (PMSM). First, the electrical losses generated in PMSM were calculated using electromagnetic finite element (FE) analysis. Secondly, a 3D electromagnetic–thermal fluid coupled FE analysis was performed to analyze the temperature distribution inside the motor by applying electrical loss as the heat source. Finally, the motor cooling performance according to the design factors of the water jacket was statistically analyzed using the design of experiment (DOE) method. It was found that the mass flow rate of 0.02547 kg/s and six passes of the water jacket with one inlet and two outlets could be considered the optimum conditions in terms of the maximum motor temperature.

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Tran, Thanh-Tuan, Sangkyun Kang, Jang-Ho Lee e Daeyong Lee. "Directional Bending Performance of 4-Leg Jacket Substructure Supporting a 3MW Offshore Wind Turbine". Energies 14, n. 9 (10 maggio 2021): 2725. http://dx.doi.org/10.3390/en14092725.

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A comprehensive investigation of the directional bending performance of a 4-leg jacket substructure, supporting a 3 MW offshore wind turbine, has been carried out in this study. The jacket substructure with a Pratt bracing system which is already installed in the southwest offshore wind farm in South Korea has been chosen as a reference support structure. A numerical model of the 3MW support structure (i.e., tower, transition piece, and jacket structure) is configured, and its structural performances are evaluated under the conditions of (1) extreme environmental loads (Env), (2) critical Design Load Cases (DLCs), and (3) a total of 288 combined load cases (CBs). For the case of Env (i.e., wind, wave, and current loads), loading directions varying from 0° to 360° at intervals of 15° are considered. The DLCs are provided from the 3 MW wind turbine manufacturer, in a 6 × 12 matrix format. The selected 4-leg jacket substructure in this study showed the smallest bending stiffness at the loading angles of 135° and 315° under the condition of Env, and at the loading angles between 105° and 150° under the CBs. From these results, critical bending directionality of the 4-leg jacket substructure is identified. This study also found that the effects of Env loads are not small compared to the total structural responses of the 4-leg jacket substructure which is supporting a 3 MW offshore wind turbine.

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Sjarifudin, Didin, Hibarkah Kurnia, Humiras Hardi Purba e Choesnul Jaqin. "Implementation of six sigma approach for increasing quality formal men’s jackets in the garment industry". Jurnal Sistem dan Manajemen Industri 6, n. 1 (30 giugno 2022): 33–44. http://dx.doi.org/10.30656/jsmi.v6i1.4359.

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This study aims to implement the Six Sigma method on formal men's jacket products in the garment industry to increase the level of sigma. The methodology is based on the Define, Measure, Analyze, Improve, and Control (DMAIC) approach. The new approach in this study is the determination of 5W+1H using a Focus Group Discussion (FGD) with five expert judgments. The design of this study has applied the Six Sigma method at the Measure stage. It is a measurement before improvement and after the Control stage as a measurement after improvement. The results of this study have increased the level of sigma from 3.5765 to 3.7839, so there is an increase of 5.48%. Increasing the sigma level contributes to a decrease in defects at the finish line by 44.09% every month. Implementing the Six Sigma method to the DMAIC approach has succeeded in increasing the level of sigma, automatically reducing the percentage of defects and increasing the productivity of formal men's jackets in the garment industry.

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39

Zhang, Bao-Lin, e Yong-Mei Xu. "Delayed fuzzy $H_\infty$ control of offshore steel jacket platforms". ANZIAM Journal 58 (20 luglio 2017): 446. http://dx.doi.org/10.21914/anziamj.v58i0.11106.

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40

Sardar, Rajib, e Subrata Chakraborty. "Wave vibration control of jacket platform by tuned liquid dampers". Ocean Engineering 247 (marzo 2022): 110721. http://dx.doi.org/10.1016/j.oceaneng.2022.110721.

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41

Zribi, Mohamed, Naif Almutairi, Mohamed Abdel-Rohman e Mohamed Terro. "Nonlinear and Robust Control Schemes for Offshore Steel Jacket Platforms". Nonlinear Dynamics 35, n. 1 (gennaio 2004): 61–80. http://dx.doi.org/10.1023/b:nody.0000017499.49855.14.

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42

Primucci, Mauricio, e Marta Basualdo. "THERMODYNAMIC PREDICTIVE FUNCTIONAL CONTROL APPLIED TO CSTR WITH JACKET SYSTEM". IFAC Proceedings Volumes 35, n. 1 (2002): 361–66. http://dx.doi.org/10.3182/20020721-6-es-1901.01369.

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43

Zhang, Bao-Lin, Zuo-Wu Huang e Qing-Long Han. "Delayed non-fragile H∞ control for offshore steel jacket platforms". Journal of Vibration and Control 21, n. 5 (17 luglio 2013): 959–74. http://dx.doi.org/10.1177/1077546313488159.

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44

Golafshani, A. A., e A. Gholizad. "Friction damper for vibration control in offshore steel jacket platforms". Journal of Constructional Steel Research 65, n. 1 (gennaio 2009): 180–87. http://dx.doi.org/10.1016/j.jcsr.2008.07.008.

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45

Zou, Ping, e Shi Gang Wu. "The Analysis of Structural Mathematical Model of Suitable Female Jacket Design Based on Waist and Hip". Advanced Materials Research 331 (settembre 2011): 599–602. http://dx.doi.org/10.4028/www.scientific.net/amr.331.599.

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Abstract (sommario):

Computer application technology which is changing with each passing day has shown strong vitality, and garment CAD technology has become the inevitable trend in garment industry and it is accelerating economic development. The relation between control parts and details for female jacket structure was established by applying stepwise regression and using C++ language. By comparing between different mathematical models, it was discovered the waist and hip had more influence to the small bust female jacket structural design. The conclusion will provide the garment pattern making experience for clothing enterprises, and it will provide data basis for garment CAD technology.

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46

Wang, Tao, Xi Chen e Rui Teng. "A Friction Damper with Continuously Variable Post-Sliding Stiffness". Advanced Materials Research 304 (luglio 2011): 59–64. http://dx.doi.org/10.4028/www.scientific.net/amr.304.59.

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Proposed in this study is a type of friction damper characterized a continuously variable post-sliding stiffness, which provides an increasing post-sliding force with the accretion of the deformation. It is possible to adjust the output force according to the performance targets at different earthquake levels, thus enlightening a practical approach to the explicit structure control to satisfy all of the required performance objectives. The proposed damper consists of a piston, a rubber layer, friction plates and the jacket. The friction plates and the inside of the jacket constitute the contact pair, or the sliding surface. The friction plates are fixed on the piston through the rubber layer which provides the normal pressure on the sliding surface. The radius of sliding surface varies continuously along the axis of the jacket. Both analyses and experiments reveal that the parabola shape of sliding surface would introduce a cubic force-displacement relationship, thus being helpful to prevent a structure from collapse.

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47

Ricci, Daniele, Francesco Battista e Manrico Fragiacomo. "Transcritical Behavior of Methane in the Cooling Jacket of a Liquid-Oxygen/Liquid-Methane Rocket-Engine Demonstrator". Energies 15, n. 12 (7 giugno 2022): 4190. http://dx.doi.org/10.3390/en15124190.

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The successful design of a liquid rocket engine is strictly linked to the development of efficient cooling systems, able to dissipate huge thermal loads coming from the combustion in the thrust chamber. Generally, cooling architectures are based on regenerative strategies, adopting fuels as coolants; and on cooling jackets, including several narrow axial channels allocated around the thrust chambers. Moreover, since cryogenic fuels are used, as in the case of oxygen/methane-based liquid rocket engines, the refrigerant is injected in liquid phase at supercritical pressure conditions and heated by the thermal load coming from the combustion chamber, which tends to experience transcritical conditions until behaving as a supercritical vapor before exiting the cooling jacket. The comprehension of fluid behavior inside the cooling jackets of liquid-oxygen/methane rocket engines as a function of different operative conditions represents not only a current topic but a critical issue for the development of future propulsion systems. Hence, the current manuscript discusses the results concerning the cooling jacket equipping the liquid-oxygen/liquid-methane demonstrator, designed and manufactured within the scope of HYPROB-NEW Italian Project. In particular, numerical results considering the nominal operating conditions and the influence of variables, such as the inlet temperature and pressure values of refrigerant as well as mass-flow rate, are shown to discuss the fluid transcritical behavior inside the cooling channels and give indications on the numerical methodologies, supporting the design of liquid-oxygen/liquid-methane rocket-engine cooling systems. Validation has been accomplished by means of experimental results obtained through a specific test article, provided with a cooling channel, characterized by dimensions representative of HYPROB DEMO-0A regenerative combustion chamber.

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48

Sudip, Paul, e Datta TK. "Semiactive control of a fixed offshore jacket platform using LQR algorithm". Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 227, n. 4 (19 novembre 2012): 367–80. http://dx.doi.org/10.1177/1475090212459848.

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49

Marrin Nakra, Teresa. "Incorporating gestures into the musical control stream with the conductor’s jacket". Journal of the Acoustical Society of America 106, n. 4 (ottobre 1999): 2161. http://dx.doi.org/10.1121/1.427189.

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Enferadi, Mohammad Hadi, Mohammad Reza Ghasemi e Naser Shabakhty. "Wave-induced vibration control of offshore jacket platforms through SMA dampers". Applied Ocean Research 90 (settembre 2019): 101848. http://dx.doi.org/10.1016/j.apor.2019.06.005.

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