Volume 5: Dynamics, Vibration, and Control最新文献

{"title":"Effect of Whirling Motion on the Fluid Induced Instability Force in Axial Compressor Rotors","authors":"Xia Sheng, T. S. Indraneel, Jay-Chul Kim","doi":"10.1115/imece2022-96957","DOIUrl":"https://doi.org/10.1115/imece2022-96957","url":null,"abstract":"\u0000 Possibilities of aerodynamics induced instability of turbomachinery rotor systems have been studied over the years. The fluid force induced by the motion of the rotor, which is a combination of the whirling motion and the rotation motion, results in an unbalanced force in the tangential direction of the whirling motion, which in turn influences the motion to cause the instability. In the past, only one type of the cross-coupled forces, the force proportional to the shaft deflection, was considered because it is the most obvious form to recognize. However, the influence of the whirling motion of the rotor has been ignored in the past studies as this motion is very difficult to precisely obtained experimentally. CFD simulations can be utilized instead to achieve it. A set of full 3D unsteady CFD simulations are presented to predict fluid induced cross-coupled force on the compressor rotor. Motions of rotor whirl and rotor self-spin are superimposed to prescribe the rigid body motion of the rotor. Mesh morphing solver is used to achieve remeshing process for the blade tip region mesh changes due to the unsteady motion of the blade. The approach for the CFD model is validated and the simulation results are explained. Based on the simulation results, an overall approach for the stability analysis of turbomachinery system is proposed.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126767744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CARDYNET: Deep Learning Based Navigation for Car-Like Robots in Dynamic Environments","authors":"G. Herr, Lasitha Weerakoon, Miao Yu, N. Chopra","doi":"10.1115/imece2022-96023","DOIUrl":"https://doi.org/10.1115/imece2022-96023","url":null,"abstract":"\u0000 Recently, there has been an increased interest in learning based navigation solutions for robots operating in dynamic environments. Navigation in such environments is particularly challenging due to several reasons. The decisions made by other agents may only be partially observable to the robot, and they may have conflicting objectives. The robot may have imperfect or no knowledge of other agents’ goals and planned routes. Several of the recent studies focus on differential drive robots. However, unlike the differential drive, car-like robots are subjected to additional motion constraints that make the problem harder. In this work, we first utilize an optimization based planner, namely TEB local planner, as the expert to generate high quality motion commands for a car-like robot operating in a simulated dynamic environment. We utilize these labels to train a deep neural network that learns to navigate. The deep learning based planner is further augmented with safety margins to enhance its effectiveness in collision avoidance. Finally, we experimentally evaluated the performance of our proposed method by comparing it with deployable TEB planner based local planners in the stage_ros simulator as well as real world experiments. Our method demonstrated superior performance in terms of obstacle avoidance as well as successful mission completion.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121667000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A New Approach to the Study and Prevention of the Clutch Judder","authors":"M. Tentarelli, Stefano Cantelli, S. Sorrentino, A. De Felice","doi":"10.1115/imece2022-92671","DOIUrl":"https://doi.org/10.1115/imece2022-92671","url":null,"abstract":"\u0000 The clutch judder observed in hydraulically actuated dual clutch transmissions cannot be fully explained by the current scientific literature.\u0000 Using a new methodological approach for the analysis of clutch judder, this study shows that a fluctuating oil pressure makes the clutch a parametrically excited system and gives rise to regions of instability as a function of the operating conditions of the clutch.\u0000 The system’s dynamic behaviour, characterized by both mechanical and structural high complexity, is here investigated through stability analysis of a mathematical model of the driveline. In particular, stability boundaries are identified by means of Floquet analysis, as well as the occurrence of both parametric resonance regions and linear resonance conditions.\u0000 This opens a new perspective on NVH of automotive drivelines, showing that clutch judder can potentially occur in a much wider range of conditions than documented in the current scientific literature.\u0000 The results of the experiments in progress on a test bench, designed in partnership with CNH Industrial, are validating the proposed model and will allow to calibrate the parameters of a predictive mathematical model to avoid the phenomenon of clutch judder in the design phase.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122065876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Engine Mounting Systems for Electric Powertrains: Mounting Layouts and Design Parameters","authors":"S. Kaul","doi":"10.1115/imece2022-87646","DOIUrl":"https://doi.org/10.1115/imece2022-87646","url":null,"abstract":"\u0000 The vibroacoustic characteristics of electric powertrains are well known to significantly differ from internal combustion engines. A relatively very high power-to-torque density makes a three-phase permanent-magnet synchronous motor (PMSM) very appealing for electric powertrains, but its electromagnetic characteristics typically result in high frequency noise and vibration. While the vibration response in internal combustion engines is generally evaluated up to 100 Hz, electric drive trains are known to exhibit a response ranging from 1 to 10 kHz. As a result, multiple studies in the recent literature have investigated several designs for engine mounting systems that could be used to address some of the specific issues such as internal resonances, wave effects, high frequency noise and vibration, etc. It has been widely reported in the literature that force transmissibility and noise radiation can be significantly underestimated at relatively higher frequencies without directly modeling the inertial properties of the engine mounting system. Some of the mounting system layouts that have been investigated in the literature include the three-point or four-point saddle mounting configurations, the cradle type pendulum mounting configuration, etc. This paper performs a comparative analysis for a few of the commonly used mounting system layouts to identify the pros and cons of the design strategies specifically aimed at vibration mitigation in electric powertrains. A spatial model that has been previously validated is used to compare three different mounting system layouts. Since viscoelastic properties are known to exhibit a strong influence from excitation frequencies, the spatial model that has been used in this study incorporates the properties that are associated with high frequency response of the engine mounting system. Force transmissibility plots are used to evaluate the mounting layouts and specific design parameters associated with the engine mounting system. Results indicate that the four-point saddle mounting configuration provides a good balance between transmissibility at low frequencies and high frequencies. Models presented in this study can be used to determine an optimal mounting configuration for an electric powertrain.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131287238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigations Into Uncertain Control Co-Design Implementations for Stochastic in Expectation and Worst-Case Robust","authors":"S. Azad, Daniel R. Herber","doi":"10.1115/imece2022-95229","DOIUrl":"https://doi.org/10.1115/imece2022-95229","url":null,"abstract":"\u0000 As uncertainty considerations become increasingly important aspects of concurrent plant and control optimization, it is imperative to identify and compare the impact of uncertain control co-design (UCCD) formulations on their associated solutions. While previous work has developed the theory for various UCCD formulations, their implementation, along with an in-depth discussion of the structure of UCCD problems, implicit assumptions, method-dependent considerations, and practical insights, is currently missing from the literature. Therefore, in this study, we address some of these limitations by proposing two optimal control structures for UCCD problems that we refer to as the open-loop single-control (OLSC) and open-loop multiple-control (OLMC). Next, we implement the stochastic in expectation UCCD (SE-UCCD) and worst-case robust UCCD (WCR-UCCD) for a simplified strain-actuated solar array (SASA) case study. For the implementation of SE-UCCD, we use generalized Polynomial Chaos expansion and benchmark the results against Monte Carlo Simulation. Next, we solve a simple SASA WCR-UCCD through OLSC and OLMC structures. Insights from such implementations indicate that constructing, implementing, and solving a UCCD problem requires an in-depth understanding of the problem at hand, formulations, and solution strategies to best address the underlying co-design under uncertainty questions.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131812996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental Investigation on the Use of Vibration Signals Combined With Supervised Classification to Predict Radial Load Condition in Roller Element Bearings","authors":"I. Abu-Mahfouz, A. Banerjee, Esfakur Rahman","doi":"10.1115/imece2022-95632","DOIUrl":"https://doi.org/10.1115/imece2022-95632","url":null,"abstract":"\u0000 In this work, vibration response of a rolling element bearing under the influence of static radial loading is investigated. Radial loading results in a periodically varying stiffness (or compliance) which causes a cyclic dynamic response of the bearing assembly even under perfect balancing and other operating load conditions. These loads cause high stresses to develop in bearing elements and may cause fatigue, cracks, and spalls that limits the life of these components. A special bearing test rig was designed and manufactured to apply varying levels of radial load and measure the vibration response of the loaded roller bearing. The test is focused on new bearings free from any faults or defects. The radial load is varied in steps and the vibration signal is collected and analyzed at each level for different rotor speeds. The spectral components are analyzed using Fast Fourier Transform (FFT) and time-frequency wavelet transform. Statistical techniques are applied to both the vibration signature obtained using a piezoelectric accelerometer sensor and the wavelet decomposed approximations and details of the original vibration signals. The statistical measures, wavelet approximation and details are first processed for feature set reduction since many of the features are highly correlated. This is done using three feature reduction and subset selection methods — ReliefF, Recursive Feature Extraction (RFE) and Multi-Cluster Feature Selection (MCFS). These features and the original extracted features are used as features to train two classifiers. The classification is used to estimate high and low thresholds for both radial load and running speed. The classifiers used are (1) radial-basis function support vector machine (RBF-SVM), and (2) k-nearest neighbor (kNN). Performance of machine learning algorithms depends on the training data and physical collected datasets are often limited to specific operating conditions, necessitating the use of training with many models using multi-fold cross-validated subsets. In this study we have used ten models using two-fold cross validation for training and validation. The classification results reported are average of these models. In limited experimentation, the RBF-SVM outperforms the kNN classifier and among the feature sets used, the ReliefF set seems marginally superior to the other sets. However, the accuracy, precision, and recall (combined as an F-score) of the original extracted feature set are better than the reduced feature sets; the downside being the relatively high run time in the training phase.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130536735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"FEA-Based Prediction and Experimental Validation of Drilling Tool Lateral Motion Dynamics","authors":"F. Song, Ke Li, Liangyu Xu","doi":"10.1115/imece2022-96130","DOIUrl":"https://doi.org/10.1115/imece2022-96130","url":null,"abstract":"Logging-while-drilling (LWD) tools are placed in the bottomhole assembly (BHA) at the lowest part of the drillstring, which are used for measuring formation properties during the excavation of the hole, or shortly thereafter. These formation properties can include spectral gamma ray, neutron, porosity, resistivity, and many others. With the tools being pushed to complete wells faster and cheaper, drilling conditions are becoming increasingly harsh. A variety of downhole vibration modes that hinder efficient drilling could occur and create wasted energy that is unusable to cut formation. Among them, BHA whirl is one of the undesired motions which can be faced during drilling operations, where the BHA follows an eccentric rotation about a point along the wellbore other than the geometric center. BHA whirl can be one of the most destructive types of drilling dynamics. For example, the lateral motion induced shock and vibration can be propagated from the outside collar to the inside chassis of the tool and damage the expensive electronics or other measurement devices. Therefore, having a reasonably accurate numerical model that can be used to understand and predict the lateral motion of a tool is highly demanded to mitigate the risks associated with the effect of whirl on measurement quality and health of the drilling tools.\u0000 This study focuses on simulating the most seen backward whirl scenario where the center of the motion rotates in the opposite direction of the drill string. A high-fidelity 3D finite element analysis (FEA) model that can capture the contact interaction between the outside collar and internal chassis of the tool and between the tool and wellbore is developed to predict the lateral motion of the drilling tool in the presence of backward whirl. A roll test system (i.e., a tubular assembly rolls along the inner wall of an impact ring while spinning with a drive motor) instrumented with accelerometers, strain gauges and high-speed cameras is also developed to mimic such dynamics that the tool could experience while drilling in a controlled lab environment. The measurements collected from the accelerometer and strain gauge are analyzed and the videos recorded with the high speed camera is processed with computer vision to experimentally determine the motion trajectory and characteristics. Excellent agreement is observed between experimental motion data and the predictions from the developed FEA model, which validates the FEA model. The validated numerical model can be very useful for fit-for-basin virtual qualification of new drilling tools and for post-run root cause analysis of drilling tool failures.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121462694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experiments on Dynamic Non-Newtonian Fluid Interaction With Shells","authors":"F. Pellicano, A. Zippo, G. Iarriccio","doi":"10.1115/imece2022-96320","DOIUrl":"https://doi.org/10.1115/imece2022-96320","url":null,"abstract":"\u0000 In this work the nonlinear vibrations of a fluid-filled circular cylindrical shell under base excitation is investigated. A polymeric (P.E.T.) thin shell with an aluminum top mass is harmonically excited from the base through an electrodynamic shaker in the neighbourhood of the natural frequency of the first axisymmetric mode. Experiments are carried out both in presence and absence of a contained fluid, which is non-Newtonian (dilatant); the dilatant fluid is composed of a cornstarch-water mixture with 60% cornstarch and 40% water of total weight, it is commonly known as oobleck. The results show a strong non-linear response due to the coupling between the fluid and structure and the shaker-structure interaction that leads to a very interesting dynamic scenario.\u0000 The system has been excited in the axial direction (vertical) through a harmonic load, with a stepped-sine sweep controlled output. Tests have been performed on empty shell, fully or partially filled shell with oobleck quiescent fluid.\u0000 The dynamic scenario is carefully analyzed by means of time histories, spectra, phase portraits and Poincaré maps. The experiments show the onset of complex dynamics: subharmonic and quasiperiodic responses, Chaos.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130296074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling and Verification of Firing Dynamics of a Multiple Launch Rocket System","authors":"Berk Aydın, H. Ö. Ünver","doi":"10.1115/imece2022-95035","DOIUrl":"https://doi.org/10.1115/imece2022-95035","url":null,"abstract":"\u0000 Multiple rocket launcher systems have great strategic importance in today’s defense systems. Therefore, the development and the quality of these strategically important systems are among the priorities of defense industry companies. The quality of the multiple launcher rocket systems is twofold. 1) Firing the ammunition with the appropriate time interval within the correct trajectories, 2) leaving the firing location quickly after completing the mission. In this study, stabilizer support legs were not used to increase vehicle mobility. The dynamics of a multiple rocket launch vehicle are modeled using rigid bodies and elastic elements with eight degrees of freedom in total. Since a 90-degree firing was performed relative to the longitudinal direction, half-vehicle modeling has been developed in the lateral direction of the vehicle. Firing tests had been executed without a support leg over a Multiple Launch Rocket System. During the firing, measurements were taken with a 3-axis accelerometer and gyroscope over the elevation and azimuth platforms. In addition, LPTs in vertical and lateral directions are placed on the superstructure. With these LPTs, the data obtained from the 3-axis accelerometer and gyroscope on the azimuth platform have been confirmed. The model parameters, stiffness/damping parameters of tires, suspensions, and hydraulic actuator, have been obtained using initial test results with MATLAB™ Parameter Estimator toolbox. The model’s accuracy has been verified with a second firing test result.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131079166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flexible Low-Level Control Software Framework for Achieving Critical Real-Time Deadlines","authors":"Nicholas J Tremaroli, Maxwell A. Stelmack, Connor W. Herron, Bhaben Kalita, A. Leonessa","doi":"10.1115/imece2022-95438","DOIUrl":"https://doi.org/10.1115/imece2022-95438","url":null,"abstract":"\u0000 In this work, a low-level software framework is proposed to simplify software development for Hardware Abstract Layered (HAL) control systems, identify networking methods for accurate real-time communication between devices, and verify task completion. The framework is implemented on a distributed microcontroller system composed of Texas Instruments TM4C123GXL Tivas for a multi-joint robot. The robot’s high-level controller executes dynamic motion control algorithms, with low-level controllers responsible for each individual joint. All microcontroller software is unified into one program and uses initialization files from the high-level controller to configure each individual Tiva depending on its location on the robot. The EtherCAT communication protocol is utilized to avoid unnecessary overhead from traditional networking protocols. A real-time operating system, TI-RTOS, enforces crucial deadlines and provides powerful diagnostic tools for the designer to optimize task completion. Overall, our proposed framework overcomes the major challenges of writing low-level control software so that development is less time-consuming, simpler to manage, and easier to validate. Further, this work can be used for many kinds of robotic systems and applications that use microcontrollers within a multi-layered control architecture.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133661879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}