High horizontal vibration

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August undefined, 2024

WebHigh-speed elevator horizontal vibration (HsEHV) is a problem that seriously affects ride comfort. To solve this problem, a design parameter optimization method for HsEHV … Web13 de set. de 2024 · Vegetables (e.g., cucumbers, lettuce, and Chinese cabbages) exhibited a similar peak in the high-frequency bands (2 240-12 800 Hz) for horizontal vibrations, although the vibration intensity varied.

High-speed elevator car system semi-active horizontal vibration ...

WebHigh-speed elevator horizontal vibration (HsEHV) is a problem that seriously affects ride comfort. To solve this problem, a design parameter optimization method for HsEHV … WebHigh-speed elevator horizontal vibration (HsEHV) is a problem that seriously affects ride comfort. To solve this problem, a design parameter optimization method for HsEHV reduction was... sharp xr-30x projector

MS - Horizontal vibration response analysis of ultra-high-speed ...

Web1 de jun. de 2012 · A margin of safety should be provided between the pump/vane pass speed/frequencies, and major structural (and/or pipe hydraulic) natural frequencies. Typical acceptable margins are 15-25%. The amplitude of the vibration response can be amplified 2.5 times or higher at or near a component natural (critical) resonant frequency. WebA rotor composed by a flexible horizontal shaft, two rigid discs, and two selfaligning ball bearings is modeled by the so-called finite elements (FE) method, considering the Timoshenko beam theory. The numerical results are encouraging, highlighting the efficiency of the PID technique to control vibrations on rotating machines. Web摘要： To suppress the horizontal vibrations of a high-speed elevator,we develop its active hydraulic guide roller.After introducing its working principles,we establish the mathematical models of the active hydraulic guide roller and the elevator cabin and design their fuzzy logic controller.Simulation results indicate that the active hydraulic guide roller … porsche cayenne 1:18

Imbalance, misalignment, looseness: know the difference

Web11 de abr. de 2024 · Dynamics Model for HV. In high-speed elevators, the unevenness of the guide rail is the primary cause of HSEC HV [].According to the dynamic equation for the elevator system, a four-DOF dynamics model for the HV of the elevator car separated from the car frame is established, as shown in Fig. 2.Due to the elevator structural … sharpy22 tdngWeb2 de abr. de 2024 · Therefore, elevator horizontal vibration suppression has become one of the key problems to be solved urgently in the field of ultra-high-speed elevator. 1,2 At present, control methods for elevator horizontal vibration reduction include passive vibration reduction 3 and active control. 4,5 Guide shoe spring and rubber block are … sharp xl-hf102b

"Web26 de abr. de 2024 · Cao SX, He Q, Zhang RJ, et al. (2024) Active control strategy of high-speed elevator horizontal vibration based on LMI optimization. Control Engineering and Applied Informatics 22(1): 72–83. Google Scholar. Chen S, Cai Y, Wang J, et al. (2024) A novel LQG controller of active suspension system for vehicle roll safety. " - High horizontal vibration

High horizontal vibration

High-speed elevator car horizontal vibration fluid–solid interaction ...

Web12 de abr. de 2024 · Abstract: To effectively suppress the horizontal vibration of a high-speed elevator car caused by uncertainties such as the irregularity of guide rails and the piston wind in the hoistway, this paper proposes a new variable universe fuzzy control method for semi-active guide shoes with magnetorheological (MR) dampers based on … Web10 de fev. de 2024 · Horizontal vibration of a high-speed elevator can seriously influence the safety, stability, and ride comfort of the elevator during the operation. The …

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Web31 de jan. de 2011 · Seiichi Shin. When elevators travel at high speed, horizontal vibrations of the car tend to be set up by guide rail deformations, so the ride quality deteriorates. Therefore, several active ... Web2 de jun. de 2024 · There are two main factors that cause the horizontal vibration of the high-speed elevator car, namely, the guidance system excitations and the car aerodynamic characteristics running in the...

Webhorizontal compressors, mounted on skids bolted to 3 ft. thick concrete foundation blocks. The foundation blocks are embedded into the sandy soil. No piles were used. Figure 11 Elevation view, with operating deflected shapes (ODS) at resonance. The Problem The units are equipped with vibration sensors, which indicated excessive vibration. WebThis study was pilot research on the effect of WBV on arterial stiffness in middle-aged and older adults. The most important finding in this study is that after 3 months of 30 Hz and 3.2 g horizontal WBV training, the bilateral baPWV were significantly reduced ( …

WebVibration can be caused by one or more factors at any given time, the most common being imbalance, misalignment, wear and looseness. Imbalance - A "heavy spot" in a rotating … WebHigh-speed elevator horizontal vibration (HsEHV) is a problem that seriously affects ride comfort. To solve this problem, a design parameter optimization method for HsEHV reduction was studied. A dynamic equation of HsEHV was established, and its response value was calculated using a precise integration method. The influence of the design …

Web1 de jun. de 2012 · The vibration level can be seen to increase (above the .30 in/sec Hydraulic Institute allowable limit) as the pump is pushed into low (suction recirculation) …

Web10 de abr. de 2024 · Thus, thermophilic composting can decrease the horizontal spread of ARGs and could be a suitable treatment for the recycling of human excreta . Miguel-Arribas and coworkers studied the presence of antitermination systems in conjugation operons of different conjugative plasmids of Gram-positive origin. sharp xl-hf102b hi-fi component systemWeb1 de set. de 2024 · This paper aims to study the horizontal vibration dynamic characteristics of high-speed elevator by considering the combined effect of airflow and guiding system. The relationships of lateral force and overturning moment with horizontal displacement, deflection angle displacement and rated speed of the car are … porsche car wash shampooWeb18 de mai. de 2024 · To accurately explore the horizontal vibration response and aerodynamic load variation law of high-speed elevator with gas-solid interaction coupling in real environment, a mathematical and a three-dimensional calculation model of the coupling vibration of the shaft airflow and car body were established based on the arbitrary … sharp xg-sv100w projector lampWeb11 de abr. de 2024 · Dynamics Model for HV. In high-speed elevators, the unevenness of the guide rail is the primary cause of HSEC HV [].According to the dynamic equation for … porsche cayenne 2004 wiper motorWebY. H. Feng, Active control of horizontal vibrations for high-speed elevator, PhD thesis, Shanghai Jiaotong University, Shanghai (2008). Google Scholar; 5. S. Mikko, H. Tapio and O. Matti, Optimization of lift car vibration behavior by modal analysis, Elevator World 33(6) (1985) 39–43. Google Scholar; 6. Y. porsche catenne seat indentstionsWeb29 de nov. de 2024 · I generally feel this can be due to 2 reasons. Some dust or deposition gets accumulated on fan impeller increasing the vibration & later it falls … porsche cayenne 2016 priceWeb14 de ago. de 2024 · Xia BH, Shi X (2012) Horizontal vibrations of high-speed elevator with guide rail excitation. Machine Building & Automation 41(5): 161–165. Crossref. Google Scholar. Yang Z, Zhang Q, Zhang RJ, et al. (2024) Transverse vibration response of a super high-speed elevator under air disturbance. porsche cayenne 2019 for sale