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john deere 540 b skidder manualJanuary 15, 2014CRC PressWhere the content of the eBook requires a specific layout, or contains maths or other special characters, the eBook will be available in PDF (PBK) format, which cannot be reflowed. For both formats the functionality available will depend on how you access the ebook (via Bookshelf Online in your browser or via the Bookshelf app on your PC or mobile device). Design synthesis is carefully balanced with design analysis, an approach developed through the use of case studies, worked examples, and chapter problems that address all levels of learning taxonomies. Machine design is also linked to manufacturing processes, an element missing in many textbooks. The contents have been greatly expanded and organized to benefit students of all levels in design synthesis and analysis approaches. For example, the use of rolling element bearings in windmills, powder metal gears, welds in blisks, and roller coaster brake designs are all new case studies in this edition that represent modern applications of these machine elements. Prior to teaching, Dr. Schmid was employed at Triodyne, Inc, performing machine design failure investigations. Among his awards are the ASME Foundation Swanson Fellowship in 2012, the ASME Newkirj Award, and the SME Parsons Awards, and he is a Fellow of the American Society of Mechanical Engineers. Prior to that he spent 18 years as a research consultant in the Tribology Branch of the NASA Lewis Research Center in Cleveland, Ohio. He received his Ph.D. and Doctor of Engineering degrees from the University of Leeds, England. His awards include the NASA Exceptional Achievement Medal in 1984, the 1998 Jacob Wallenberg Award given by The Royal Swedish Academy of Engineering Sciences, and the 2000 Mayo D. Hersey Award from the American Society of Mechanical Engineers. From 1973 until 1987, he was professor of machine elements at Lulea Technology University in Sweden. In 1997 he was appointed professor of machine elements at Lund University.http://e-hematologica.com/users/how-to-install-cygwin-packages-manually.xml
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Professor Jacobson has written ten compendia used at Swedish universities, six covering different machine elements and four covering the basic course and the advanced course in tribology. To learn how to manage your cookie settings, please see our. Books Audiobooks Magazines Podcasts Sheet Music Documents (selected) Snapshots Fundamentals of Machine Elements, 2nd Ed. Uploaded by sssf-doboj 78 (9) 78 found this document useful (9 votes) 6K views 489 pages Document Information click to expand document information Description: A Classic approach to product development typically involves large design iterations. A more modern approach shows a main design flow with minor iterations representing concurrent engineering inputs. Report this Document Download now Save Save Fundamentals of Machine Elements, 2nd Ed. For Later 78 (9) 78 found this document useful (9 votes) 6K views 489 pages Fundamentals of Machine Elements, 2nd Ed. Uploaded by sssf-doboj Description: A Classic approach to product development typically involves large design iterations. For Later 78 78 found this document useful, Mark this document as useful 22 22 found this document not useful, Mark this document as not useful Embed Share Print Download now Jump to Page You are on page 1 of 489 Search inside document Cancel anytime. Share this document Share or Embed Document Sharing Options Share on Facebook, opens a new window Share on Twitter, opens a new window Share on LinkedIn, opens a new window Share with Email, opens mail client Copy Text Related Interests Extrusion Deformation (Engineering) Bending Bronze Metals Related searches Fundamentals of machine elements Footer menu Back to top About About Scribd Press Our blog Join our team. Quick navigation Home Books Audiobooks Documents, active.http://huemin.com/fckeditor/userfiles/how-to-install-cruise-control-manual-transmission.xml Report this Document Download now Save Save fundamentals of machine design solution manual For Later 50 (2) 50 found this document useful (2 votes) 3K views 64 pages Fundamentals of Machine Design Solution Manual Original Title: fundamentals of machine design solution manual Uploaded by Neil Bose Description: chapter 10 solutions Full description Save Save fundamentals of machine design solution manual For Later 50 50 found this document useful, Mark this document as useful 50 50 found this document not useful, Mark this document as not useful Embed Share Print Download now Jump to Page You are on page 1 of 64 Search inside document Cancel anytime. Share this document Share or Embed Document Sharing Options Share on Facebook, opens a new window Share on Twitter, opens a new window Share on LinkedIn, opens a new window Share with Email, opens mail client Copy Text Footer menu Back to top About About Scribd Press Our blog Join our team. Specially developed for the Mechanical Engineering freshers and professionals, these model questions are asked in the online technical test and interview of many companies. These tutorial are also important for your viva in university exams like Anna university, Pune, VTU, UPTU, CUSAT etc. Breadcrumbs Section. Click here to navigate to respective pages. Book Book Fundamentals of Machine Elements DOI link for Fundamentals of Machine Elements Fundamentals of Machine Elements book SI Version Fundamentals of Machine Elements DOI link for Fundamentals of Machine Elements Fundamentals of Machine Elements book SI Version By Steven R. Schmid, Bernard J. Hamrock, Bo. O. Jacobson Edition 3rd Edition First Published 2014 eBook Published 30 June 2014 Pub. Here in this article I offer some advice for writing good design docs and what mistakes to avoid. One caveat: Different teams will have different standards and conventions for technical design.http://www.familyreunionapp.com/family/events/edenpure-model-500-manual There is no industry-wide standard for the design process, nor could there be, as different development teams will have different needs depending on their situation. What I will describe is one possible answer, based on my own experience. Design Process Let’s start with the basics: What is a technical design doc, and how does it fit in to the design process. A technical design doc describes a solution to a given technical problem. It is a specification, or “design blueprint”, for a software program or feature. The primary function of a TDD is to communicate the technical details of the work to be done to members of the team. However, there is a second purpose which is just as important: the process of writing the TDD forces you to organize your thoughts and consider every aspect of the design, ensuring that you haven’t left anything out. Technical design docs are often part of a larger process which typically has the following steps: Product requirements are defined. These will typically be represented by a Product Requirements Document (PRD). The PRD specifies what the system needs to do, from the perspective of a user or outside agent. Technical requirements are defined. The product requirements are translated into technical requirements — what the system needs to accomplish, but now how it does it. The output of this step is a Technical Requirements Document (TRD). Technical design. This contains a technical description of the solution to the requirements outlined in the previous steps. The TDD is the output of this step. Implementation. This is the stage where the solution is actually built. Testing. The system is tested against the PRD and TRD to ensure that it actually fulfills the specified requirements. Between each of these stages there is typically a review process to ensure that no mistakes were made. If any errors, misunderstandings, or ambiguities are detected, these must be corrected before proceeding to the next step. This process is highly variable; the set of steps listed here will change on a case-by-case basis. For example: For smaller features that don’t involve a lot of complexity, steps 2 and 3 will often be combined into a single document. If the feature involves a large number of unknowns or some level of research, it may be necessary to construct a proof-of-concept implementation before finalizing the technical design. This process also happens at different scales and levels of granularity. The dividing line between TRD and TDD can be a bit blurry at times. For example, suppose you are developing a server that communicates via a RESTful API. If the goal is to conform to an already-established and documented API, then the API specification is part of the requirements and should be referenced in the TRD. If, on the other hand, the goal is to develop a brand new API, then the API specification is part of the design and should be described in the TDD. (However, the requirements document still needs to specify what the API is trying to accomplish.) Writing the TDD These days, it is common practice to write technical docs in a collaborative document system, such as Google Docs or Confluence; however this is not an absolute requirement. The important thing is that there be a way for your team members to be able to make comments on the document and point out errors and omissions. Most TDDs are between one and ten pages. Although there’s no upper limit to the length of a TDD, very large documents will be both difficult to edit and hard for readers to absorb; consider breaking it up into separate documents representing individual steps or phases of the implementation. Diagrams are helpful; there are a number of online tools that you can use to embed illustrations into the document, such as draw.io or Lucidchart. You can also use offline tools such as Inkscape to generate SVG diagrams. The document should be thorough; ideally, it should be possible for someone other than the TDD author to implement the design as written. For example, if the design specifies an implementation of an API, each API endpoint should be documented. If there are subtle design choices, they should be called out. Avoid Common Writing Mistakes Probably the most common mistake that I encounter in TDDs is a lack of context. That is, the author wrote down, in as few words as they could manage, how they solved the problem; but they didn’t include any information on what the problem was, why it needed to be solved, or what were the consequences of picking that particular solution. Also, it’s important to keep in mind who the likely reader is, and what level of understanding they have. If you use a term that the reader might not know, don’t be afraid to add a definition for it. It hardly needs to be stated that good grammar and spelling are helpful. Also, avoid the temptation for wordplay or “cute” spelling; while programmers as a class tend to like playing around with language, I’ve seen more than one case where excessive frivolity ended up costing the team wasted effort because of misunderstandings. It’s all right to use occasional humor or choose colorful, memorable names for features and systems, since that helps people remember them. But don’t let your desire to show off how clever you are become a distraction. Speaking of names, choose them carefully; as Mark Twain once wrote, “Choose the right word, not it’s second cousin.” There’s a tendency for engineers with poor vocabularies to use the same generic terms over and over again for different things, leading to overloading and confusion. For example, naming a class “DataManager” is vague and tells you nothing about what it actually does; by the same token a package or directory named “utils” could contain virtually anything. Consult a thesaurus if you need to find a better word, or better, a specialized synonym database such as WordNet. TDD Template When writing a TDD, it can be helpful to start with a standard template. The following is a template that I have used in a number of projects. Note that this template should be customized where needed; you are free to delete sections which don’t apply, add additional sections, or rename headings as appropriate. TDD Author: Introduction Rationale What are you trying to accomplish. What’s wrong with things the way they are now. Background Describe any historical context that would be needed to understand the document, including legacy considerations. Terminology If the document uses any special words or terms, list them here. Non-Goals If there are related problems that you have decided not to address with this design, but which someone might conceivably expect you to solve, then list them here. Proposed Design Start with a brief, high-level description of the solution. The following sections will go into more detail. System Architecture If the design consists of a collaboration between multiple large-scale components, list those components here — or better, include a diagram. Data Model Describe how the data is stored. This could include a description of the database schema. For example, if there are REST endpoints, describe the endpoint URL and the format of the data and parameters used. Business Logic If the design requires any non-trivial algorithms or logic, describe them. Migration Strategy If the design incurs non-backwards-compatible changes to an existing system, describe the process whereby entities that depend on the system are going to migrate to the new design. Impact Describe the potential impacts of the design on overall performance, security, and other aspects of the system. Risks If there are any risks or unknowns, list them here. Also if there is additional research to be done, mention that as well. Alternatives If there are other potential solutions which were considered and rejected, list them here, as well as the reason why they were not chosen. Of course, these sections are only starting points. You can add additional sections such as “Design Considerations”, “Abstract”, “References”, “Acknowledgements”, and so on as appropriate. TDD Lifecycle During construction of the system, the TDD serves as a reference, coordinating the activities of the team members working on the project. However, after construction is finished, the TDD will continue to exist and serve as documentation for how the system works. You may want to distinguish between “current” and “archived” TDDs. However, there are two perils to watch out for: First, TDDs can quickly become out of date as the system continues to evolve. An engineer using a two-year-old TDD as a reference can waste a lot of time trying to understand why the system doesn’t behave as described. Ideally, stale TDDs would be marked as obsolete or superseded; in practice this seldom happens, as teams tend to focus on current rather than past work. (Keeping documentation up to date is a challenge that every engineering team struggles with.) Second, a TDD may not include all of the information needed to interface with the system. A TDD might only cover a set of changes to an already-existing system, in which case you would need to consult earlier documentation (if it exists) to get the whole picture. And a TDD mainly focuses on implementation details, which may be irrelevant to someone who simply wants to invoke an API. Thus, a TDD should not be considered an adequate substitute for actual user or API reference docs. Finally There are plenty of other articles on the web explaining how to write a great design doc. Don’t just read this one. Read several, and then pick a mix of ideas that is right for you. Update There’s a follow-on article, Writing Technical Design Documents, Revisited, that provides some additional information. More Essays by Talin: Engineering Insights There’s a lot more to the craft of software engineering than just the ability to code. I’m a mad natural philosopher. Medium is an open platform where 170 million readers come to find insightful and dynamic thinking. Here, expert and undiscovered voices alike dive into the heart of any topic and bring new ideas to the surface. Learn more Make Medium yours. Follow the writers, publications, and topics that matter to you, and you’ll see them on your homepage and in your inbox. Explore Write a story on Medium. If you have a story to tell, knowledge to share, or a perspective to offer — welcome home. It’s easy and free to post your thinking on any topic. Start a blog About Write Help Legal Get the Medium app. SD-Access is software application running on Cisco DNA Center hardware that is used to automate wired and wireless campus networks. In addition to network virtualization, fabric technology in the campus network enhances control of communications, providing software-defined segmentation and policy enforcement based on user identity and group membership. Using Cisco DNA Center to automate the creation of virtual networks with integrated security and segmentation reduces operational expenses and reduces risk. Network performance, network insights, and telemetry are provided through the Assurance and Analytics capabilities. It is a companion to the associated deployment guides for SD-Access, which provide configurations explaining how to deploy the most common implementations of the designs described in this guide. The intended audience is a technical decision maker who wants to understand Cisco’s campus offerings, learn about the available technology options, and use leading practices for designing the best network for the needs of an organization. Organizations are now constantly challenged by the need to scale their network capacity to react quickly to application demands and growth. Because the campus network is used by people with different levels of access and their BYOD devices to access these applications, the wired and wireless LAN capabilities should be enhanced to support those changing needs. The access layer design should have the ability to support Power over Ethernet (PoE) with 60W per port, offered with Cisco Universal Power Over Ethernet (UPOE), and the access layer should also provide PoE perpetual power during switch upgrade and reboot events.Traditional access control lists (ACLs) can be difficult to implement, manage, and scale because they rely on network constructs such as IP addresses and subnets rather than group membership. Group membership is an IP-agnostic approach to policy creation which provides ease of operation for the network operator and a more scalable approach to ACLs. Hospitals are required to have HIPAA-compliant wired and wireless networks that can provide complete and constant visibility into their network traffic to protect sensitive medical devices (such as servers for electronic medical records, vital signs monitors, or nurse workstations) so that a malicious device cannot compromise the networks. It is considered abnormal behavior when a patient's mobile device communicates with any medical device. SD-Access can address the need for complete isolation between patient devices and medical facility devices by using macro-segmentation and putting devices into different overlay networks, enabling the isolation. By using Scalable Group Tags (SGTs), users can be permitted access to printing resources, though the printing resources cannot directly communicate with each other. Building control systems such as badge readers and physical security systems such as video surveillance devices need access to the network in order to operate, though these devices are segmented into different overlay networks than where the users resides. Guest network access is common for visitors to the enterprise and for employee BYOD use. However, the Guest network can remain completely isolated from the remainder of the corporate network and the building management network using different overlay networks. These users and devices may need access to printing and internal web servers such as corporate directory. However, not all will need access to development servers, employee and payroll data from human resources, and other department-specific resources. Using SGTs, users and device within the overlay network can be permitted access to specific resources and denied access to others based on their group membership. As described later in the Fabric Roles section, the wired and wireless device platforms are utilized to create the elements of a fabric site. This section describes the functionality of the remaining two components for SD-Access: Cisco DNA Center and the Identity Services Engine. The appliance is available in form factors sized to support not only the SD-Access application but also network Assurance and Analytics, Software image management (SWIM), Wide-Area Bonjour, and new capabilities as they are available. Cisco DNA begins with the foundation of a digital-ready infrastructure that includes routers, switches, access-points, and Wireless LAN controllers. Automation, Analytics, Visibility, and management of the Cisco DNA network is enabled through Cisco DNA Center Software. SD-Access is part of this software and is used to design, provision, apply policy, and facilitate the creation of an intelligent wired and wireless campus network with assurance. In addition to automation for SD-Access, Cisco DNA Center provides applications to improve an organization's efficiency such as network device health dashboards. ISE is an integral and mandatory component of SD-Access for implementing network access control policy. ISE performs policy implementation, enabling dynamic mapping of users and devices to scalable groups, and simplifying end-to-end security policy enforcement. Within ISE, users and devices are shown in a simple and flexible interface. ISE integrates with Cisco DNA Center by using Cisco Platform Exchange Grid (pxGrid) and REST APIs (Representational State Transfer Application Programming Interfaces) for endpoint event notifications and automation of policy configurations on ISE. Scalable Group Tags are a metadata value that is transmitted in the header of fabric-encapsulated packets. While SGTs are administered by Cisco ISE through the tightly integrated REST APIs, Cisco DNA Center is used as the pane of glass to manage and create SGTs and define their policies. Group and policy services are driven by ISE and orchestrated by Cisco DNA Center's policy authoring workflows. Policy management with identity services is enabled in an SD-Access network using ISE integrated with Cisco DNA Center for dynamic mapping of users and devices to scalable groups. This simplifies end-to-end security policy management and enforcement at a greater scale than traditional network policy implementations relying on IP access-lists. Personas are simply the services and specific feature set provided by a given ISE node. The four primary personas are PAN, MnT, PSN, and pxGrid. It handles all system-related configurations that are related to functionality such as authentication, authorization, and auditing. This persona provides advanced monitoring and troubleshooting tools that used to effectively manage the network and resources. A node with this persona aggregates and correlates the data that it collects to provide meaningful information in the form of reports. This persona evaluates the policies and makes all the decisions. Typically, there would be more than one PSN in a distributed deployment. All Policy Service nodes that reside in the same high-speed Local Area Network (LAN) or behind a load balancer can be grouped together to form a node group. TrustSec information like tag definition, value, and description can be passed from Cisco ISE to other Cisco management platforms such as Cisco DNA Center and Cisco Stealthwatch. Multiple, distributed nodes can be deployed together to provide failover resiliency and scale. The range of deployment options allows support for hundreds of thousands of endpoint devices. Minimally, a basic two-node ISE deployment is recommended for SD-Access single site deployments with each ISE node running all services (personas) for redundancy. In the case of a standalone deployment, the PSN persona is referenced by a single IP address. An ISE distributed model uses multiple, active PSN personas, each with a unique address. All PSN addresses are learned by Cisco DNA Center, and the Cisco DNA Center user associates the fabric sites to the applicable PSN. In these networks, the IP address is used for both network layer identification (who the device is on the network) and as a network layer locator (where the device is at in the network or to which device it is connected). This is commonly referred to as addressing following topology. While an endpoint’s location in the network will change, who this device is and what it can access should not have to change.This relationship is called an EID-to-RLOC mapping. This EID and RLOC combination provide all the necessary information for traffic forwarding, even if an endpoint uses an unchanged IP address when appearing in a different network location (associated or mapped behind different RLOCs). This provides the benefits of a Layer 3 Routed Access network, described in a later section, without the requirement of a subnetwork to only exist in a single wiring closet. In case of a failure to resolve the destination routing locator, the traffic is sent to the default fabric border node. The response received from the control plane node is stored in the LISP map-cache, which is merged to the Cisco Express Forwarding (CEF) table and installed in hardware. When encapsulation is added to these data packets, a tunnel network is created. Tunneling encapsulates data packets from one protocol inside a different protocol and transports the original data packets, unchanged, across the network. A lower-layer or same-layer protocol (from the OSI model) can be carried through this tunnel creating an overlay. In SD-Access, this overlay network is referred to as the fabric. It provides a way to carry lower-layer data across the higher Layer 3 infrastructure. Unlike routing protocol tunneling methods, VXLAN preserves the original Ethernet header from the original frame sent from the endpoint. This allows for the creation of an overlay at Layer 2 and at Layer 3 depending on the needs of the original communication. For example, Wireless LAN communication (IEEE 802.11) uses Layer 2 datagram information (MAC Addresses) to make bridging decisions without a direct need for Layer 3 forwarding logic. Layer 2 overlays are identified with a VLAN to VNI correlation (L2 VNI), and Layer 3 overlays are identified with a VRF to VNI correlation (L3 VNI). As show in Figure 2, VXLAN encapsulation uses a UDP transport. Along with the VXLAN and UDP headers used to encapsulate the original packet, an outer IP and Ethernet header are necessary to forward the packet across the wire. At minimum, these extra headers add 50 bytes of overhead to the original packet. The goal of Cisco TrustSec technology is to assign an SGT value to the packet at its ingress point into the network. An access policy elsewhere in the network is then enforced based on this tag information. In the policy plane, the alternative forwarding attributes (the SGT value and VRF values) are encoded into the header, and carried across the overlay. Through its automation capabilities, the control plane, data plane, and policy plane for the fabric devices is easily, seamlessly, and consistently deployed. Through Assurance, visibility and context are achieved for both the infrastructure devices and endpoints. Cisco DNA Center is an intuitive, centralized management system used to design, provision, and apply policy across the wired and wireless SD-Access network. It takes the user’s intent and programmatically applies it to network devices. This section describes and defines the word fabric, discusses the SD-Access fabric underlay and overlay network, and introduces shared services which are a shared set of resources accessed by devices in the overlay. This section provides an introduction for these fabric -based network terminologies used throughout the rest of the guide. Design consideration for these are covered in a later section. Overlays are created through encapsulation, a process which adds additional header(s) to the original packet or frame. An overlay network creates a logical topology used to virtually connect devices that are built over an arbitrary physical underlay topology. In an idealized, theoretical network, every device would be connected to every other device. In this way, any connectivity or topology imagined could be created. While this theoretical network does not exist, there is still a technical desire to have all these devices connected to each other in a full mesh. This is where the term fabric comes from: it is a cloth where everything is connected together. In networking, an overlay (or tunnel) provides this logical full-mesh connection. All network elements of the underlay must establish IP connectivity via the use of a routing protocol. Instead of using arbitrary network topologies and protocols, the underlay implementation for SD-Access uses a well-designed Layer 3 foundation inclusive of the campus edge switches which is known as a Layer 3 Routed Access design.