Relevant bibliographies by topics / Gearbox

Academic literature on the topic 'Gearbox'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 March 2023

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Journal articles on the topic "Gearbox"

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Truta, Marian, Octavian Fieraru, Radu Vilau, Valentin Vinturis, and Marin Marinescu. "Static and Dynamic Analysis of a Planetary Gearbox Working Process." Advanced Materials Research 837 (November 2013): 489–94. http://dx.doi.org/10.4028/www.scientific.net/amr.837.489.

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Present paper focuses on the power circuits within planetary gearboxes, providing an original mathematical model. This model is an excellent instrument to analyze and determine the torque, angular speed, power factors, global gear ratios and efficiency distribution. The analysis itself has been developed for the second-gear, forward-motion of the gearbox. The analysis provides the mathematical model of the gearboxs way of working both in the static and dynamic modes. The method starts with issuing the equivalent graph (network structure) of the gearbox. Using this model, the gearbox is associated to a power driveline network that both transforms and guides the power flow to the final transmission of the vehicle. Using the network structural model, the gearbox turns into a general nodal diagram (graph). Our study concerned both the static and dynamic modes. It consists in a mathematical determination of the cinematic (angular speed) and dynamic (torque) factors that charge the gearboxs components. The mathematical model takes into account the power losses and the inertia occurring within the entire network and their influences upon the general power distribution. Using the model, we could get accurate results of the torque and power distribution. Moreover, the model provides the map of the power distribution when the gearbox works in its second gear, emphasizing the difference between the analysis performed for the two above mentioned working regimes (static and dynamic). The results can be further used as entry points for a much more complex mathematical model that describes the dynamic features of the vehicle.
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Gong, Jingyi, Geng Liu, Bing Yuan, Lan Liu, Long Yang, and Fukang Wu. "Coupled dynamics characteristics analysis of the marine multi-gearbox system under multi-source excitation." Advances in Mechanical Engineering 14, no. 4 (April 2022): 168781322210929. http://dx.doi.org/10.1177/16878132221092999.

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The marine multi-gearbox system has the characteristics of multi-source excitation and multi-gearbox coupled. The interaction among gearboxes is inevitable. To reveal the coupled mechanism, a coupled dynamic model of multi-gearbox system is proposed in this paper by the generalized finite element method and the substructure method. The dynamic model of each gearbox in the multi-gearbox system is also established. Under the same working conditions, the dynamic response of single gearbox and multi-gearbox system are obtained. The results show that the adjacent gear pairs of adjacent gearboxes are more affected by the coupled effect at low rotational speed. Compared with single gearbox, the RMS curve of multi-gearbox system of meshing forces generates some new resonance peaks, which are caused by the new modes excited by the mesh frequencies of adjacent gearboxes. The dynamic response of gear pairs which are greatly affected by coupled effect are more sensitive to the change of stiffness of couplings. Reducing the stiffness of the couplings can weaken the coupled effect of the system, and vice versa. The change of housing stiffness does not influence the coupled effect of the multi-gearbox system, and the new modes and resonance peaks generated by the coupled effect have not changed significantly.
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Bligh, A. O., Noor A. Ahmed, and Y. Y. Zheng. "Design and Manufacture of a Planetary Gearbox Rig." Applied Mechanics and Materials 397-400 (September 2013): 176–88. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.176.

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Planetary gearboxes are required in many applications but have a high failure rate especially in wind turbines where rapid growth in turbine size is placing larger demands on the gearboxes. Current condition monitoring techniques are less effective at detecting faults in planetary gearboxes due to the complexity of the internal rotating components. A small scale planetary gearbox was, therefore, needed for testing on a gearbox test rig to develop a more effective method of condition monitoring. The detailed computer design and manufacture of the planetary gearbox for this purpose is detailed in this paper.
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Lin, Deng-Fa, Po-Hung Chen, and Mike Williams. "Measurement and Analysis of Current Signals for Gearbox Fault Recognition of Wind Turbine." Measurement Science Review 13, no. 2 (April 1, 2013): 89–93. http://dx.doi.org/10.2478/msr-2013-0010.

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This paper presents a novel solution method based on measurement and analysis of current signals for gearbox fault recognition of wind turbine. A gearbox with typical oil-leakage fault is purposely made. The oil-leakage gearbox and a normal gearbox are used as experimental models to measure and analyze the current signals of generator. This work employs wavelet transform (WT), empirical mode decomposition (EMD) and fast Fourier transform (FFT) to analyze the current signals for both the oil-leakage and the normal gearboxes. K-nearest neighbors (KNN) is used on automatic fault recognition. First, the normal gearbox and the oilleakage gearbox are separately applied to practical power platform experiments. Second, empirical mode decomposition is applied on analyzing the intrinsic mode function (IMF) of the current signals, and fast Fourier transform is used to get the intrinsic mode function spectrum. Finally, the features of the spectrum are extracted, and K-nearest neighbors is used on gearbox fault recognition of wind turbine. Experimental results indicate that the proposed solution method can effectively recognize the oilleakage fault of gearboxes.
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Dechen, Yao, Limin Jia, Yong Qin, and Yang Jianwei. "A Method for Railway Gearbox Faults Detection Based on Time- Frequency Feature Parameters and Genetic Algorithm Neural Network." Open Mechanical Engineering Journal 8, no. 1 (September 16, 2014): 349–53. http://dx.doi.org/10.2174/1874155x01408010349.

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Early identification of faults in railway gearboxes is a challenging task in gearbox fault detection. There are extensive studies, such as patents and papers have been fully developed for processing vibration signals to obtain diagnostic information about gearbox. We have proposed a new technique for detecting faults in the railway gearbox by applying the time frequency parameters and genetic algorithm neural network to deal with railway gearbox fault signals. In this method, wavelet analysis and empirical mode decomposition (EMD) are carried out on gearbox vibration signals for extracting the time-frequency feature parameters. Then genetic algorithm neural network (GNN) is used for the classifications of the time-frequency feature parameters. The analysis results show that the effectiveness and the high recognition rate in classifying different faults of railway gearboxes.
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Rakhit, A. K. "An Improved Epicyclic Gearbox for Reduced and Controllable Subsynchronous Vibrations in Gas Turbogenerator Applications." Journal of Engineering for Gas Turbines and Power 119, no. 3 (July 1, 1997): 640–46. http://dx.doi.org/10.1115/1.2817032.

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An improvement is made to the design of an epicyclic gearbox that limits the dynamic eccentricities of gearbox components. Gearboxes were manufactured to the new design and tested, showed reduced levels of subsynchronous vibrations at the turbine bearings. The in-situ balancing feature of the gearbox is also found to be very effective in reducing these vibrations further. The improved gearboxes not only assured the service life of the turbine bearings, but also increased the success rate of package testing the first time with substantial cost savings.
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Miao, Qiang, and Qinghua Zhou. "Planetary Gearbox Vibration Signal Characteristics Analysis and Fault Diagnosis." Shock and Vibration 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/126489.

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Planetary gearboxes are widely used in helicopters, wind turbines, mining machinery, and so forth. The structure and motion type of a planetary gearbox are more complex in comparison with a fixed-shaft one, which makes condition monitoring and fault diagnosis of planetary gearbox a challenging issue in practical applications. In order to understand the fundamental nature of planetary gearbox vibration, this paper conducts an investigation on vibration characteristics of a single-stage planetary gearbox. Assuming that the gearbox and the sensor revolve inversely at the speed of planet carrier, the problem can be transformed into two easier parts: research on fixed-shaft gearbox signal model and research on influence of sensor spinning. Based on this assumption, a vibration signal model of planetary gearbox is obtained. Experimental data are used to validate the model.
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Yue, Xiao Feng, and Cheng Wei Zhu. "The Application and Research of Order Analysis in Gearbox Fault Diagnosis." Applied Mechanics and Materials 635-637 (September 2014): 844–50. http://dx.doi.org/10.4028/www.scientific.net/amm.635-637.844.

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This paper researched the failure mechanism of the gearbox and resample algorithm in order analysis. For diagnosing the types of gearbox’s fault by analyzing the acquisition of vibration signal and extracting the fault characteristics of the gear. A function that relation gearbox vibration signal amplitude to order and shaft speed and transform from the time domain signal to angular domain signal was deduced. The MQ250 gearbox model was applied for the experimental analysis in this paper, the fault mechanism function of this gearbox has been successfully verified and the gearbox fault characteristic information has been extracted.
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Sharipov, V. M., M. I. Dmitriyev, A. S. Zenin, I. A. Malanin, and I. A. Smirnov. "On the slipping of friction clutches during gear shifting without interruption of power flow in gearboxes of cars and tractors." Traktory i sel hozmashiny 82, no. 6 (June 15, 2015): 5–9. http://dx.doi.org/10.17816/0321-4443-65386.

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The article considers the slipping process of friction clutches in gearboxes of cars and tractors during gear shifting without interruption of power flow. It is proved that the gear shifting process in gearbox without power flow interruption occurs when clutch friction discs of engaged gear are slipping and discs of disengaging gear are closed. At this, the value of torque transmitted by disengaging friction clutch in gearbox depends on a value of frictional moment of engaging friction clutch. The results of this article also apply to composite gearboxes such as DSG (Direct Shift Gearbox).
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KRESELYUK, Yuri V. "Analysis of the problems of mechanical gearboxes of transport systems and their solution using a magnetic sensor." Proceedings of Petersburg Transport University 2021, no. 4 (December 2021): 561–70. http://dx.doi.org/10.20295/1815-588x-2021-4-561-570.

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Objective: Increasing reliability of mechanical gearboxes using a magnetic sensor, which will sig nifi cantly increase the reliability of transport mechanisms and systems in general. Methods: An analysis of incidents covered in the media was carried out. Results: Conclusions are drawn about the consequences of failure of mechanical gearboxes. To prevent emergency situations caused by a breakdown of a mechanical gearbox, it is proposed to use a magnetic sensor, which allows carrying out analysis and diagnostics of the gearbox and its components during operation. A mathematical model of a magnetic sensor is compiled and a block diagram of a device for processing the output signal of the sensor modulator is presented. Practical importance: Failure of a mechanical gearbox is a common problem that leads to a stop of transport mechanisms and systems. Detection of a mechanical gearbox malfunction can signifi cantly reduce the cost of repairs, as well as prevent unexpected damage to the mechanism, which can lead to a complete stop of the transport system. The use of a magnetic sensor in the traction gearbox of an electric train will reduce the likelihood of a traction gearbox breakdown during operation and reduce the cost of repairs, increase the reliability of the traction drive, and also simplify the commissioning of new electric trains and traction gearboxes.
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Dissertations / Theses on the topic "Gearbox"

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Bengtsson, Jonas. "Gearbox Diagnosis." Thesis, Linköpings universitet, Fordonssystem, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-75565.

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Diagnosis based on vibration analysis is a method that has many benefits to offer. It is easy to implement the method on existing transmissions by attaching accelerometers outside the gearbox housing. If you have knowledge of the gearbox geometry, such as number of tooth on the gears and types of bearings, and any unwanted frequencies can be filtered out a good estimation of the gearbox condition can be achieved. In this thesis a number of condition indicators have been tested to identify and isolate different faults that may appear. All analysing have been done in the time domain on different synchronously averaged signals. The condition indicators have been used together with diagnosis theory from the division of Vehicular systems to create a diagnosis system able to find faults on a number of modelled signals.
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Meisingseth, Andreas. "Demodulation Techniques in Gearbox Diagnostics." Thesis, Uppsala universitet, Signaler och System, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-177275.

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This thesis covers the scope of one out of many ways to diagnose gearboxes, demodulating the excited vibrational signals to enhance fault detection and identification. The topic is not only of academic interest since the achievements that can be made by successful machine condition monitoring in the industry. It has a potential value that is close to be absurd, for example unplanned production stops is commonly known to be one of the worst nightmares for manufacturing companies and if one can detect faults in early stages one can improve the possibilityto plan a production stop and therefore increase the profit. Four demodulation algorithms were developed and implemented in MATLAB on data characterized by close to stationarity and distinctive energy centered around the harmonics of the gearmesh frequency. The resulting algorithms for narrowband phase and amplitude demodulation was shown to outperform Hilbert transform based phase and amplitude demodulation algorithms in gearbox diagnostics. One of the goals with the thesis was therefore reached; demodulation algorithms were developed and implemented on data. A comparison of these algorithms was done and a conclusion of which demodulation technique is superior was done. Experimental work was carried out on a test-rig and both local and distributed faults were introduced to two gearboxes, one kind of fault per gearbox. However, the data acquired from the test-rig showed severe non-stationarity and smeared spectrum properties even when angular resampling was performed and therefore a major drawback of the demodulation techniques was exploited since the methods for demodulation in this thesis are not applicable for signals with smeared spectrums. The other goal was therefore not accomplished; to distinguish a local fault from a distributed fault in data acquired by experimental work by applying the selected demodulation techniques.
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Zaremba, Slawomir M. Caughey Thomas Kirk Beck J. L. "Dynamical signatures of gearbox vibrations /." Diss., Pasadena, Calif. : California Institute of Technology, 1998. http://resolver.caltech.edu/CaltechETD:etd-02082008-160817.

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Hamilton, Andrew. "Development of novel gearbox lubrication condition monitoring sensors in the context of wind turbine gearboxes." Thesis, University of Strathclyde, 2015. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=25910.

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Wind power has become established as an alternative power source that forms a significant proportion of national energy generation. An increasing proportion of turbines is being constructed offshore to exploit higher average wind speeds and to avoid development issues associated with onshore wind farms. Isolated locations and unpredictable weather conditions lead to increased access costs for operators when conducting scheduled and unscheduled maintenance and repairs. This has increased interest in condition monitoring systems which can track the current state of components within a wind turbine and provide operators with predicted future trends. Asset management can be improved through condition based maintenance regimes and preventative repairs. Development of novel condition monitoring systems that can accurately predict incipient damage can optimise operational performance and reduce the overall level of wind turbine generation costs. The work described in this thesis presents the development of novel sensors that may be applied to monitor wind turbine gearboxes, a component that experiences relatively high failure rates and causes considerable turbine downtime. Current systems and technology that may be adapted for use in wind turbine condition monitoring are evaluated. Lubrication related monitoring systems have been identified as an area that could be improved and are divided into those that track liberated wear material suspended in the lubricant and those that assess the state of the lubricant itself. This study presents two novel lubrication based gearbox monitoring sensors that potentially offer a low cost solution for continuous data capture. The first demonstrates the potential for active pixel sensors such as those found in digital cameras to capture images of wear particles within gearbox lubricants. Particle morphology was tracked in this system, allowing the type of particles to be correlated with the type of wear that is generated and a potential source. The second sensor uses a targeted form of infra-red absorption spectroscopy to track changes in the lubricant chemistry due to the increase in acidity. Ensuring the lubricant is functioning correctly decreases component stress and fatigue, reducing maintenance requirements.
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Ozturk, Fatih Mehmet. "Optimum Design Of Multistep Spur Gearbox." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606749/index.pdf.

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Optimum design of multistep gearbox, since many high-performance power transmission applications (e.g., automotive, space industry) require compact volume, has become an important interest area. This design application includes more complicated problems that are not taken into account while designing single stage gear drives. Design applications are generally made by trial and error methods depending on the experience and the intuition of the designer. In this study, using Visual Basic 6.0, an interactive program is developed for designing multistep involute standard and nonstandard spur gearbox according to the American Gear Manufacturers Association (AGMA) Standards 218.01 and 2001- B88. All the equations for calculating the pitting resistance geometry factor I, and the bending strength geometry factor J, are valid for external spur gears that are generated by rack-type tools (rack cutters or hobs). The program is made for twostage to six-stage gear drives, which are commonly used in the industry. Compactness of gear pairs and gearbox, and equality of factor of safety against bending failure is taken as the design objective. By considering the total required gear ratio, the number of reduction stages is input by the user. Gear ratios of every stage is distributed to the stages according to the total gear ratio that satisfies the required precision (from ±
0.1 to ±
0.00001 on overall gear ratio) depending on the user selected constraints (unequal gear ratio for every stage, noninteger gear ratio e.g.). Dimensional design is determined by considering bending stress, pitting stress, and involute interference constraints. These steps are carried out iteratively until a desirable solution is acquired. The necessary parameters for configuration design such as number of teeth, module, addendum modification coefficient, are selected from previously determined gear pairs that satisfies the constraints by user interaction considering the performance criterion from the developed program. The positions of gears and shafts are determined automatically in order to keep the volume of gearbox as minimum while satisfying the nonlinear spatial constraints (center distance constraint for proper meshing of gear pairs, face distance constraint for proper assembly of pinion and gear having same shaft, gear interference constraint for preventing interferences between gears, shaft interference constraint for preventing interferences between gears and shafts) by using DLL (Dynamic Link Library) technology of Lingo 8.0 optimization software together with Visual Basic 6.0. If shaft interference constraint is removed then cantilevered mounting of gear pairs would also be possible, otherwise the gears should be mounted between bearings. Visual output of assembly is made by using Autodesk Inventor 7.0, automatically by the program.
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Gustavsson, Mårdestam Peter, and Adam Lundin. "Efficiency Analysis of a Planetary Gearbox." Thesis, Linköpings universitet, Maskinkonstruktion, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-65578.

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This Bachelor of Science thesis consists of an efficiency evaluation and creation of atheoretical model for an Atlas Copcos epicyclic gearbox. The thesis starts with atheoretical chapter containing the fundamentals of epicyclic gearing and the build of thespecific gearbox investigated. The following chapter contains former testing and theoryof power losses in a gearbox. After the theory is explained the next chapter containstesting, compromises and assumptions during testing and also results from the testing.The next chapter explains the Matlab calculation program based on the theory andmeasurements. Finally the model is validated against reference a reference model andagainst real gearbox measurements followed by some closing conclusions. The finalmodel calculates the efficiency rather well and has a linear difference. The difference isstatic since some losses have been left out, it can be fixed with an empirical correctionfactor which corrects the values and predicts an acceptable efficiency. The correctionfactor for the surface roughness also decreases the difference.
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Arlotto, Amaury. "Engine and Gearbox Thermal Management Modeling." Thesis, KTH, Maskinkonstruktion (Inst.), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-235508.

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In order to improve the global efficiency of an engine within the French company Groupe PSA, a research axis focuses on gearbox thermalmanagement for a quicker reduction of its own friction losse after a cold start. The principle remains in deriving a little part of the coolant energy towards the gearbox – until now heated by its own internal frictions – as long as the impact on the engine warm-up is low enough for a global final gain. A compromise has then to be found between a gearbox performance enhancement and an engine degradation to get the better global consumption gain in the end. This will be achieved through 1D simulations thanks to the software AMESim, in parallel with Simulink and Matlab. Different cooling circuit architectures and parameters will be tested in a performance and safety point of view to find the best compromise in a pre-research phase.
För att förbättra den globala effektiviteten hos en motor inom det franska företaget Groupe PSA, en forskningsaxel fokuserar på växellådans värmemanagement för en snabbare minskning av egen friktion efter en kallstart. Principen är att avleda en liten del av kylvätskenergin mot växellådan – förrän nu värms upp av sina egna inre friktioner – så länge som påverkan på motorns uppvärmning är tillräckligt låg för en global slutförbättring. En kompromiss finns då mellan en växellådans prestationsförbättring och en motornedbrytning för att få den bättre globala konsumtionsvinsten i slutändan. Detta kommer att uppnås genom 1D-simuleringar tack vare mjukvaran AMESim, parallellt med Simulink och Matlab. Olika kylkretsarkitekturer och parametrar testas i prestations- och säkerhetssynpunkt för att hitta den bästa kompromissen i en förforskningsfas.
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Häggström, Martin. "Thermal modelling of a truck gearbox." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-63753.

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The thermal regime of a gearbox is of considerable importance to its performance. Several significant gearbox parameters, such as the efficiency and fatigue life of its components, are temperature dependent. It is thus important to be able to determine the temperatures of the gearbox components during operation, but they are difficult to measure experimentally. A simulation model capable of predicting these temperatures would therefore be a valuable tool. The objective of this master’s thesis was to create a model capable of simulating the thermal regime of a truck gearbox during operation. To do this, mechanical losses in the gearbox, heat exchange with the surroundings, as well as heat transfer between components had to be accounted for. The model was created using the 1D simulation software LMS Imagine.Lab Amesim 14.0, and is based on a combination of mechanical and thermal networks. Details of the mechanical and thermal interactions between components are calculated using empirical and analytical formulas for mechanical losses and heat transfer. The result of the thesis is a model which can be used to simulate either real or idealised load cases, from which temperatures of gear wheels, shafts, bearings, housing and gearbox oil may be studied, as well as gearbox losses and heat transfer. Comparisons between simulated and measured gearbox efficiencies show good correlation. It is also shown that the model can predict oil temperatures which agree with in-vehicle measurements. Due to a lack of measurement data, most simulated component temperatures cannot be compared to measured values. However, temperature measurements performed for one of the gear wheels indicate that the model can be used to predict their temperature. In order to demonstrate the capabilities of the model, example results from both real and idealised load cases are presented.
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Juhlin-Dannfelt, Peter, and Johan Stridkvist. "Driveline Observer for an Automated Manual Gearbox." Thesis, Linköping University, Department of Electrical Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6947.

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The Automated Manual Transmission system Opticruise is dependent on signals from sensors located in different parts of the Scania trucks. These signals are of different qualities and have different update frequencies. Some signals and quantities that are hard or impossible to measure are also of importance to this system.

In this thesis a driveline observer for the purpose of signal improvement is developed and estimations of unknown quantities such as road incline and mass of the vehicle are performed. The outputs of the observer are produced at a rate of 100 Hz, and include in addition to the mass and road incline also the speed of the engine, output shaft of the gearbox, wheel and the torsion in the driveline. Further the use of an accelerometer and the advantages gained from using it in the observer are investigated.

The outputs show an increased quality and much of the measurement noise is successfully removed without introducing any time delays. A simulation frequency of 100 Hz is possible, but some dependency toward the stiffness of the driveline is found. The observer manages to estimate the road slope accurately. With the use of an accelerometer the road slope estimation is further improved and a quickly converging mass estimation is obtained.

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Prakash, del Valle Carlos. "Thermal modelling of an FZG test gearbox." Thesis, KTH, Maskinkonstruktion (Inst.), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-157256.

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Gearboxes are always subject of study in order to increase their efficiency. Energy losses in gear contacts are transformed into heat which is distributed among the gearbox components increasing their temperature. A thermal model of the gearbox brings the opportunity of a deeper understanding of the heat dissipated related to the power losses in the gear contact. A MATLAB program based on ordinary differential equations was developed in order to make a thermal model of an FZG test gearbox. The model is based on a thermal network where each node represents a machine element. The thermal network is composed by thermal resistances due to deformation in the gear contact, conduction, convection and radiation. With thermal resistances, power losses and thermal inertia of each element, the temperature evolution was obtained by applying the First Principle of Thermodynamics. Due to the temperature evolution, heat transfer between different elements was estimated. Additionally, experimental results from an FZG test rig were implemented in the model and also used to verify its accuracy. Furthermore, additional features to the model such as a cooling system and spray lubrication were also studied. Results show a wide capability and handling of the program in terms of thermal analysis: heat flux direction and magnitude, visual tools such as thermal network of the test gearbox, as well as the analysis of different operating conditions. With these tools, an approach to the minimum amount of lubricant necessary and other ways to quench overheating could then be reached. Keywords: Thermal network, FZG gear test rig, heat flow, temperature, MATLAB, ODE.
Växellådor är ständigt ett forskningsområde för att förbättra deras verkningsgrad. Energiförluster i kuggkontakter omvandlas till värme som sprids i växellådan som sedan värmer upp komponenterna. En termisk modell av växellådan gör det möjligt för djupare förståelse hur värmen sprids i förhållande till energiförlusterna i kuggkontakten. Ett MATLAB-program baserat på ordinära differential-ekvationer utvecklades för att göra en termisk modell av en växellåda i en kuggrigg från FZG. Modellen är baserad på ett termiskt nätverk där varje nod representerar en maskinkomponent. Det termiska nätverket består av resistanser som uppstår på grund av deformation i kuggkontakten, ledning, konvektion och strålning. Med termiska resistanser, energiförluster, termisk tröghet från komponenterna och genom att applicera termodynamikens första grundsats kunde temperatur-genereringen bestämmas. Från temperatur-genereringen kunde värme-ledningen mellan komponenter uppskattas. Testresultat från en FZG-kuggrigg användes för att verifiera modellens noggrannhet. Andra egenskaper till modellen, som ett annat kylsystem och spraysmörjning studerades för att undersöka möjligheteten att adderas till modellen. Resultat visar på en bred användning av modellen i avseende på termisk analys: värmeflödets storlek och riktning, ett visuellt redskap för växellådans temperatur och hur växellådans temperatur varierar under olika driftförhållanden. Med de här redskapen kan den minsta oljemängden som behövs för att smörja kuggkontakten undersökas och hur kylning av kugghjulen kan förbättras. Nyckelord: Termiskt nätverk, FZG kugghjuls-rigg, värmeflöde, temperatur, MATLAB, ODE
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Books on the topic "Gearbox"

1

Stokes, Alec. Manual gearbox design. Oxford: Butterworth-Heinemann, 1992.

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V, Sundt C., McKibbon A. H, and United States. National Aeronautics and Space Administration., eds. Advanced gearbox technology: Advanced counter-rotating gearbox : detailed design report. [Washington, DC]: National Aeronautics and Space Administration, 1988.

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Sheng, S. Gearbox Reliability Collaborative update. Golden, CO: NREL, National Renewable Energy Laboratory, 2013.

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Tůma, Jiří. Vehicle Gearbox Noise and Vibration. Chichester, UK: John Wiley & Sons, Ltd, 2014. http://dx.doi.org/10.1002/9781118797563.

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E, Anderson N., and Lewis Research Center, eds. Advanced gearbox technology: Final report. [Cleveland, Ohio]: NASA Lewis Research Center, 1987.

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United States. National Aeronautics and Space Administration., ed. Gearbox vibration diagnostic analyzer: Final report. Bedford, MA: Technology Integration, 1992.

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Leung, R. C. N. Power transmissibility of an idealised gearbox. Southampton: Institute of Sound and Vibration Research, University of Southampton, 1985.

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Sheng, S. Wind turbine gearbox failure modes: A brief. Golden, Colo.]: National Renewable Energy Laboratory, 2011.

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Oswald, Fred B. Effect of operating conditions on gearbox noise. Cleveland, Ohio: National Aeronautics and Space Administration, Lewis Research Center, 1992.

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Oyague, F. Gearbox Reliability Collaborative (GRC) description and loading. Golden, CO: National Renewable Energy Laboratory, 2011.

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Book chapters on the topic "Gearbox"

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Ritschel, Uwe, and Michael Beyer. "Gearbox." In Designing Wind Turbines, 123–33. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-08549-9_7.

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Koch, Grady, and Elias Koch. "The Gearbox." In LEGO Wind Energy, 17–27. Berkeley, CA: Apress, 2019. http://dx.doi.org/10.1007/978-1-4842-4439-5_2.

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Su, Daizhong, and Zhongming Ren. "Gearbox Life Cycle Assessment." In Sustainable Product Development, 193–219. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-39149-2_10.

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Bartelmus, Walter, and Radoslaw Zimroz. "Gearbox Condition Monitoring Procedures." In Lecture Notes in Mechanical Engineering, 249–60. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-39348-8_21.

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Li, Huaxia. "Gearbox of Wind Turbine." In Advanced Wind Turbine Technology, 59–118. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78166-2_3.

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Nikhil, T. N., Mayank Chutani, Gautam Mahesh, and Lokavarapu Bhaskara Rao. "3D Printable Gearbox Casing." In Lecture Notes in Mechanical Engineering, 271–94. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4208-2_20.

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Tuan, Nguyen Anh, Nguyen Thi Hong Cam, Dang Quoc Cuong, Le Hoang Anh, Nguyen Huu Quang, Nguyen Thanh Tu, Luong Viet Dung, and Tran Ngoc Giang. "Determining Optimal Transmission Ratios of Worm Helical Gearbox for Minimum Gearbox Cost." In Advances in Engineering Research and Application, 336–49. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92574-1_35.

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Mendes, R. Vilela, M. de Faria, and L. Streit. "Map Dynamics in Gearbox Models." In Proceedings of the Second European Symposium on Mathematics in Industry, 1–36. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2979-1_1.

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Jančar, Lukáš, Jiří Začal, and Zdeněk Folta. "Reverse Engineering of the Gearbox Case." In Current Methods of Construction Design, 79–87. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-33146-7_9.

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Burián, M., M. Trochta, and J. Havlik. "HCR Gears in the Industrial Gearbox." In The Latest Methods of Construction Design, 7–14. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-22762-7_2.

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Conference papers on the topic "Gearbox"

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Bryant, Michael D., and Jihoon Choi. "Model Based Diagnostics for Gearboxes." In ASME/STLE 2011 International Joint Tribology Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ijtc2011-61263.

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A model-based diagnostic to detect and assess faults is applied to gearboxes. Signals measured from a gearbox were compared to corresponding signals from simulations. The gearbox simulation model includes dynamics of input, lay and output shafts, gear bodies, bearings, and kinematics and tribology of gear tooth contacts. These were assembled into a systems model via bond graphs. To make simulations emulate measurements, the model’s parameters were “tuned”. A direct physical correspondence between parameters and real system elements locates faults. Considered was gear tooth cracking. Faults disturb normal flow of power and signal through a machine. Viewing the gearbox as a communications channel, and applying information theory theorems to the perturbed signals permitted assessment of the gearbox’s functional health.
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David, Bernardo, Bernardo Magri, Christian Matt, Jesper Buus Nielsen, and Daniel Tschudi. "GearBox." In CCS '22: 2022 ACM SIGSAC Conference on Computer and Communications Security. New York, NY, USA: ACM, 2022. http://dx.doi.org/10.1145/3548606.3559375.

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Lenjani, Marzieh, Alif Ahmed, Mircea Stan, and Kevin Skadron. "Gearbox." In ISCA '22: The 49th Annual International Symposium on Computer Architecture. New York, NY, USA: ACM, 2022. http://dx.doi.org/10.1145/3470496.3527402.

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Roche, Brian P. "Alternatives in Gearbox Seals for Main Drive Gearboxes." In SNAME 11th Propeller and Shafting Symposium. SNAME, 2006. http://dx.doi.org/10.5957/pss-2006-15.

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A variety of sealing devices have been used to seal Marine Main Reduction Gears. One means of sealing Main Reduction Gears today is the labyrinth seal. While the labyrinth seal has been successfully employed in some applications, it has performed unsatisfactorily in others. This paper discusses mechanical seals as alternatives to labyrinth seals for use in Marine Main Reduction Gears. Along with a discussion a/Labyrinth Seals, various types of mechanical seals are considered, along with their respective advantages and disadvantages. Split Circumferential Seals are described in particular. Seal design features, as well as test results, are presented.
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Rakhit, A. K. "An Improved Epicyclic Gearbox for Reduced and Controllable Sub-Synchronous Vibrations in Gas Turbogenerator Applications." In ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-gt-019.

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An improvement is made to the design of epicyclic gearbox that limits the dynamic eccentricities of gearbox components. Gearboxes manufactured to the new design and tested, showed reduced levels of sub-synchronous vibrations at the turbine bearings. The in-situ balancing feature of the gearbox is also found to be very effective in reducing these vibrations further. The improved gearboxes not only assured the service life of the turbine bearings, but also increased the success rate of package testing the first time with substantial cost savings.
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Venkataram, Nithin, Harish K. Bhagavan, Rahul M. Cadambi, and Arun R. Rao. "Numerical Simulation and Experimental Validation of Frequency Based Fault Detection and Localization in a Planetary Gearbox Under Dynamic Condition." In ASME 2019 Gas Turbine India Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gtindia2019-2523.

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Abstract The planetary gearbox is often susceptible to faults under dynamic condition. Most of the literature assumes that gearboxes are free from defects. But in real-time working condition these assumptions are not accurate. Therefore the challenge lies in identifying and localizing a fault in planetary gearbox under dynamic condition. In this paper, the focus is on modelling and simulation of a fault in a planetary gearbox and validate the same with experimental tests. A planetary gearbox is modelled as per DIN standard and simulated for time and frequency domain signals. On comparing a fault free and fault induced frequency domain signals, a small peaks are observed on either side of the mesh frequencies, indicating the presence of a fault in the planetary gearbox. These peaks around the mesh frequencies are used to localize the fault in a planetary gearbox. Simulation results are validated with the experimental test results of the planetary gearbox under dynamic conditions. Similar trend is observed in simulation and experimental results.
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Rosso, Carlo, Giovanni Belingardi, and Vittorio Romagnoli. "Gearbox Paradigm: A Support for Quick and Effective Gearbox Design." In WCX SAE World Congress Experience. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2019. http://dx.doi.org/10.4271/2019-01-0806.

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Tatar, Ali, and Christoph W. Schwingshackl. "Effect of a Planetary Gearbox on the Dynamics of a Rotor System." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75479.

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The dynamic analysis of rotors with bladed disks has been investigated in detail over many decades and is reasonably well understood today. In contrast, the dynamic behaviour of two rotors that are coupled via a planetary gearbox is much less well understood. The planetary gearbox adds inertia, mass, stiffness, damping and gyroscopic moments to the system and can strongly affect the modal properties and the dynamic behaviour of the global rotating system. The main objective of this paper is to create a six degrees of freedom numerical model of a rotor system with a planetary gearbox and to investigate its effect on the coupled rotor system. The analysis is based on the newly developed finite element software “GEAROT” which provides axial, torsional and lateral deflections of the two shafts at different speeds via Timoshenko beam elements and also takes gyroscopic effects into account. The disks are currently considered as rigid and the bearings are modelled with isotropic stiffness elements in the translational and rotational directions. A novel planetary gearbox model has been developed, which takes the translational and rotational stiffness and the damping of the gearbox, as well as the masses and inertias of the sun gear, ring gear, planet gears and carrier into account. A rotating system with a planetary gearbox has been investigated with GEAROT. The gearbox mass and stiffness parameters are identified as having a significant effect on the modal behaviour of the rotor system, affecting its natural frequencies and mode shapes. The higher frequency modes are found to be more sensitive to the parameter changes as well as the modes which have a higher deflection at the location of the gearbox on the rotor system. Compared with a single shaft system, the presence of a gearbox introduces new global modes to the rotor system and decouples the mode shapes of the two shafts. The introduction of a planetary gearbox may also lead to an increase or a reduction of the frequency response of the rotor system based on gear parameter values.
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Modaresahmadi, Sina, Casey Nichols, and Wesley Williams. "Mechanical Design of Magnetic Gearboxes Optimized for Assembly." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86878.

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Magnetic gearing is a developing technology that utilizes magnetic forces to transmit torque through a system. Unlike traditional gears that rely on teeth engagement to transmit motion and torque, interacting magnetic fields in a magnetic gear transfer the torque with no contact area required. Early magnetic gearbox designs stemmed from an electromagnetic design, however, at larger scales the assembly process as well as electromagnetic design drives the overall mechanical design, due to high magnetic forces and stresses during the assembly. The development of magnetic gearboxes involves the optimization of the assembly process, the electromagnetic design and the mechanical performance to achieve a design that is robust, efficient, manufacturable, and economical. Each of these attributes is necessary to advance the technical readiness for applications as varied as wind turbines or robotics. These qualities were sought in the design of two new magnetic gearboxes which have been manufactured and tested. The mechanical design of the multistage gearbox established a repeatable assembly process that could be upscaled without compromising the structural integrity of the components. Design variants were simulated and tested to limit bending and shear stresses in the gearbox, whilst maintaining the electromagnetic performance of the system. The mechanical design of the modular magnetic gearbox established a new rotor design where manufacturability and configurability were improved to make the gearbox ideal for applications that require varying gear ratios.
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Zhang, Shengli, Jiong Tang, and Yu Ding. "Modeling and Analysis of Time-Periodic Gearbox Vibration." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-27230.

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In a modern wind turbine, the gearbox is an expensive and fault-prone subsystem. Currently, condition monitoring, based on comparison of data of healthy baseline measurement and online measurement, followed by feature analysis and decision making, is the main approach of diagnosis and prognosis. Although having been employed in many practical implementations, such methods have limitations. For example, a huge database is needed when operating conditions change and normal variations are significant. Traditionally, first-principle-based modeling of gearboxes is considered very challenging, primarily due to their dynamic characteristics that exhibit time-periodicity and encompass a very wide frequency range. In this research, aiming at achieving the predictive modeling capability, a lumped-parameter model of a two-stage laboratory gearbox testbed is constructed based on the assumed mode method. This model can characterize the gearbox dynamic effects including the time-varying mesh stiffness and backlash. The Floquet theory and harmonic balance method are then applied to analytically investigate the system dynamics, where the eigenvalues of the time-periodic gearbox are extracted and correlated to the spectral analysis results of the time-domain response prediction. This modeling approach and the associated analysis lay down a foundation for establishing hybrid dynamic model of complex gearbox systems which will further be utilized in model-based diagnosis and prognosis.
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Reports on the topic "Gearbox"

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Munch, K., and M. McDade. Gearbox Reliability Collaborative: Gearbox Inspection Metadata. Office of Scientific and Technical Information (OSTI), September 2010. http://dx.doi.org/10.2172/989023.

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Keller, Jonathan. Gearbox Reliability Collaborative Gearbox 3 Planet Bearing Calibration. Office of Scientific and Technical Information (OSTI), March 2017. http://dx.doi.org/10.2172/1349210.

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Keller, Jonathan, and Robb Wallen. Gearbox Reliability Collaborative Phase 3 Gearbox 2 Test Report. Office of Scientific and Technical Information (OSTI), June 2015. http://dx.doi.org/10.2172/1215122.

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Keller, Jonathan, and Robb Wallen. Gearbox Reliability Collaborative Phase 3 Gearbox 3 Test Plan. Office of Scientific and Technical Information (OSTI), October 2016. http://dx.doi.org/10.2172/1328995.

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Keller, Jonathan, and Robb Wallen. Gearbox Reliability Collaborative Phase 3 Gearbox 3 Test Report. Office of Scientific and Technical Information (OSTI), February 2017. http://dx.doi.org/10.2172/1345490.

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Link, H., J. Keller, Y. Guo, and B. McNiff. Gearbox Reliability Collaborative Phase 3 Gearbox 2 Test Plan. Office of Scientific and Technical Information (OSTI), April 2013. http://dx.doi.org/10.2172/1076631.

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Keller, Jon, Yi Guo, and Latha Sethuraman. Gearbox Reliability Collaborative Investigation of Gearbox Motion and High-Speed-Shaft Loads. Office of Scientific and Technical Information (OSTI), March 2016. http://dx.doi.org/10.2172/1243302.

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Errichello, R., and J. Muller. Gearbox Reliability Collaborative Gearbox 1 Failure Analysis Report: December 2010 - January 2011. Office of Scientific and Technical Information (OSTI), February 2012. http://dx.doi.org/10.2172/1036039.

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van Dam, J. Gearbox Reliability Collaborative Bearing Calibration. Office of Scientific and Technical Information (OSTI), October 2011. http://dx.doi.org/10.2172/1028033.

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Blau, Peter Julian, Larry R. Walker, Hanbing Xu, Randy J. Parten, Jun Qu, and Tom Geer. Wear Analysis of Wind Turbine Gearbox Bearings. Office of Scientific and Technical Information (OSTI), April 2010. http://dx.doi.org/10.2172/980718.

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