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Noise, Vibration, and Harshness Considerations for Autonomous Vehicle Perception Equipment
No full textAutomakers looking to remake their traditional vehicle line-up into autonomous vehicles, Noise, Vibration, and Harshness (NVH) considerations for autonomous vehicles are soon to follow. While traditional NVH considerations still must be applied to carry-over systems, additional components are required for an autonomous vehicle to operate. These additional components needed for autonomy also require NVH analysis and optimization. Autonomous vehicles rely on a suite of sensors, including Light Detection and Ranging (LiDAR) and cameras placed at optimal points on the vehicle for maximum coverage and utilization. In this study, the NVH considerations of autonomous vehicles are examined, focusing on the additional perception equipment installed in autonomous vehicles. In particular, the nature of modifications to existing vehicles to increase the level of autonomy, and the associated NVH characteristics of these alterations, are reviewed with suggestions for future application to autonomous vehicles. A case study in the design of an original autonomous vehicle based on a production all-electric car, a 2017 Chevrolet Bolt, is outlined. A detailed description of the NVH design and verification process for this vehicle is provided, with results giving insight into the NVH design of autonomous vehicles and the challenges that are created
Combined Equivalent Circuits and Distribution of Relaxation Times Analysis and Interfacial Effects of (La0.60Sr0.40)0.95Co0.20Fe0.80O3-Xcathodes
No full textIn this work, symmetrical cells with a commercial (La0.60Sr0.40)0.95Co0.20Fe0.80O3-x, (LSCF) cathode and electrolyte have been fabricated and studied using a combination of complex non-linear least square fitting (CNLS), distribution of relaxation times (DRT), and high resolution SEM/EDS techniques. The cathode has been fired at different temperatures from 1050 °C to 1125 °C at 25 °C intervals. Electrochemical impedance spectroscopy (EIS) data indicate that at 1050 °C interfacial ionic resistances are dominant while chemical diffusion plays a larger role between 1075 °C and 1100 °C. At 1125 °C the cathode has over densified affecting both interfacial and diffusion resistances. Both CNLS and DRT have been used to identify the electrochemical processes; however, the resistance values obtained for the two methods are different in some cases. This problem is exacerbated when inductance is present in the data especially for resistance and constant phase elements equivalent circuits. In this case, CNLS analysis can give back the same values used for the simulation, while the DRT approach cannot produce the same values with negligible differences. SEM/EDS chemical maps show that no chemical interactions have occurred at the highest sintering step, reaffirming that gadolinium doped ceria (GDC) is a good barrier layer when fully dense
Novel EM Guided Endovascular Instrumentation for In Situ Endograft Fenestration
Get PDFObjective: This work aims at providing novel endovascular instrumentation to overcome current technical limitations of in situ endograft fenestration including challenges in targeting the fenestration site under fluoroscopic control and supplying mechanical support during endograft perforation. Technology: Novel electromagnetically trackable instruments were developed to facilitate the navigation of the fenestration device and its stabilization at the target site. In vitro trials were performed to preliminary evaluate the proposed instrumentation for the antegrade in situ fenestration of an aortic endograft, using a laser guidewire designed ad hoc and the sharp end of a commercial endovascular guidewire. Results: In situ fenestration was successfully performed in 22 trials. A total of two laser tools were employed since an over bending of laser guidewire tip, due to its manufacturing, caused the damage of the sensor in the first device used. Conclusions: Preliminary in vitro trials demonstrate the feasibility of the proposed instrumentation which could widespread the procedure for in situ fenestration. The results obtained should be validated performing animal studies. Clinical Impact: The proposed instrumentation has the potential to expand indications for standard endovascular aneurysm repair to cases of acute syndromes
Queueing-Inventory Models with Batch Demands and Positive Service Times
No full textWe consider queueing-inventory models in which customers arrive according to a point process and each customer demands for one or more items but not exceeding a predetermined (finite) value, say, N. The demands of the customers require positive service times. Replenishments are based on (s, S)-type policy and the lead times are assumed to be random. We consider two models. In Model 1, any arriving customer finding the inventory level to be zero will be lost. In Model 2, the loss of customers occur in two ways. First, an arriving customer finding the inventory level to be zero with the server being idle will be lost, and secondly, the customers, if any, present at a service completion with zero inventory will all be lost. We assume that in both the models the demands may be met partially based on the requests and the available inventory levels at that time. The inventory level is reduced by the amount to meet (fully or partially) the requisite demand of the customer at the beginning of the service. Under the assumption that all underlying random variables are exponential, we perform the steady-state analysis of the models using the classical matrix-analytic methods. Illustrative examples comparing the two models are presented
12/2/2020: Faculty Senate Approved Meeting Minutes
No full textUCC Changes Course Change: IME 301 modification to drop MECH 307 Co-Req. Approved (13,1) New Course: MGMT 424/624 Data Visualization. Approved (10,1,2
Safe Return to Campus Playbook: Summer 2020
Get PDFReturning to campus this summer requires all members of the Kettering University community to agree to a campus compact. This compact mandates that we all observe a set of prescribed behaviors designed to reduce the risk of COVID-19 transmission to employees and students on and off campus. These behaviors include social distancing, use of proper hygiene, and wearing facial coverings in shared spaces.
Your compliance, with no exception, is absolutely necessary to limit the spread of the virus in our community. To continue providing excellent educational experiences for our students, academic delivery of programs and student services will be adapted to support these behaviors.
This Playbook is designed to outline both preparations and expectations for everyone’s safe Return to Campus in summer 2020. Our priorities for this Playbook include:
• ensuring the health and safety of students, faculty, staff, and our neighbors in Flint
• providing an excellent Kettering education to every student
• strengthening our University community
• acting as good stewards of our resources Social distancing is required in all situations and face coverings are necessary with few exceptions.
Everyone is responsible for monitoring and reporting COVID-19 status or symptoms on a daily basis as well as practicing good hygiene, including frequent handwashing, which is essential. If required, members of the Kettering community must participate in a contact-tracing program.
Dining service will be reconfigured including staggered meals and limits on the size of gatherings, both on and off campus. Scheduling, delivery, and instruction of academic courses will also change to accommodate safety protocols, which are detailed in this Playbook.
Please understand the pandemic situation is evolving, and the policies and protocols in this Playbook are subject to change as circumstances warrant. For example, if COVID-19 creates a significant health issue on campus, in Michigan, or if there are new government mandates issued, we may have to alter our plans significantly
June 15, 2020: Covid-19 Update and Safe Return to Campus Update Vol. 4
Get PDFThe following campus update provides important information about including safety measures and modifications to classrooms and labs and academic support services put in place for Summer Term and the phased return to campus of employees
4/22/2020: Course Change Form EE582
No full textEliminating 500 level courses. EE-582 will become EE-482/682