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Load Test
Load testing is the process of putting demand on a structure or system and measuring its response. Software load testing Physical load testing Many types of machinery, engines, structures, and motors are load tested. The load may be at a designated safe working load (SWL), full load, or at an aggravated level of load. The governing contract, technical specification or test method contains the details of conducting the test. The purpose of a mechanical load test is to verify that all the component parts of a structure including materials, base-fixings are fit for task and loading it is designed for. Several types of load testing are employed * Static testing is when a designated constant load is applied for a specified time. * Dynamic testing is when a variable or moving load is applied. * Cyclical testing consists of repeated loading and unloading for specified cycles, durations and conditions. The ''Supply of Machinery (Safety) Regulation 1992 UK'' state that load testi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Umgeni River Bridge Load Test
The Umgeni River or Mgeni River () is a river in KwaZulu-Natal, South Africa. It rises in the "Dargle" in the KZN Midlands, and its mouth is at Durban, some distance north of Durban's natural harbour. It is generally agreed its name means "the river of entrance" in Zulu, though other meanings have been suggested. The river is approximately long with a catchment area of . The Howick Falls are some famous waterfalls on the Mngeni. Tributaries A noteworthy tributary is the Msunduzi River, which joins it between Nagle and Inanda dams. Higher up its course, the Msunduzi (or 'Dusi' for short) passes through the KwaZulu-Natal capital Pietermaritzburg. A famous downriver race, the Dusi Canoe Marathon takes place between the capital and Durban, attracting thousands of canoeists for the three-day event held every year January. A small tributary that has an impact exceeding its size and length is the Lions River which joins the Umgeni about 4 kilometers upstream of Midmar Dam (near ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soak Testing
Soak testing involves testing a system with a typical production load, over a continuous availability period, to validate system behavior under production use. It may be required to extrapolate the results, if not possible to conduct such an extended test. For example, if the system is required to process 10,000 transactions over 100 hours, it may be possible to complete processing the same 10,000 transactions in a shorter duration (say 50 hours) as representative (and conservative estimate) of the actual production use. A good soak test would also include the ability to simulate peak loads as opposed to just average loads. If manipulating the load over specific periods of time is not possible, alternatively (and conservatively) allow the system to run at peak production loads for the duration of the test. For example, in software testing, a system may behave exactly as expected when tested for one hour. However, when it is tested for three hours, problems such as memory leak ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quality Assurance
Quality assurance (QA) is the term used in both manufacturing and service industries to describe the systematic efforts taken to assure that the product(s) delivered to customer(s) meet with the contractual and other agreed upon performance, design, reliability, and maintainability expectations of that customer. The core purpose of Quality Assurance is to prevent mistakes and defects in the development and production of both manufactured products, such as automobiles and shoes, and delivered services, such as automotive repair and athletic shoe design. Assuring quality and therefore avoiding problems and delays when delivering products or services to customers is what ISO 9000 defines as that "part of quality management focused on providing confidence that quality requirements will be fulfilled". This defect prevention aspect of quality assurance differs from the defect detection aspect of quality control and has been referred to as a ''shift left'' since it focuses on quality effor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Software Testing
Software testing is the act of checking whether software satisfies expectations. Software testing can provide objective, independent information about the Quality (business), quality of software and the risk of its failure to a User (computing), user or sponsor. Software testing can determine the Correctness (computer science), correctness of software for specific Scenario (computing), scenarios but cannot determine correctness for all scenarios. It cannot find all software bug, bugs. Based on the criteria for measuring correctness from an test oracle, oracle, software testing employs principles and mechanisms that might recognize a problem. Examples of oracles include specifications, Design by Contract, contracts, comparable products, past versions of the same product, inferences about intended or expected purpose, user or customer expectations, relevant standards, and applicable laws. Software testing is often dynamic in nature; running the software to verify actual output ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Web Server Benchmarking
Web server benchmarking is the process of estimating a web server performance in order to find if the server can serve sufficiently high workload. Key parameters The performance is usually measured in terms of: *Number of requests that can be served per second (depending on the type of request, etc.); *Latency response time in milliseconds for each new connection or request; *Throughput in bytes per second (depending on file size, cached or not cached content, available network bandwidth, etc.). The measurements must be performed under a varying load of clients and requests per client. Tools for benchmarking Load testing (stress/performance testing) a web server can be performed using automation/analysis tools such as: * Apache JMeter, an open-source Java load testing tool * ApacheBench (or ab), a command line program bundled with Apache HTTP Server *Siege, an open-source web-server load testing and benchmarking tool * Wrk, an open-source C load testing tool *Locust, an open-so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Web Testing
Web testing is software testing that focuses on web applications. Complete testing of a web-based system before going live can help address issues before the system is revealed to the public. Issues may include the security of the web application, the basic functionality of the site, its accessibility to disabled and fully able users, its ability to adapt to the multitude of desktops, devices, and operating systems, as well as readiness for expected traffic and number of users and the ability to survive a massive spike in user traffic, both of which are related to load testing. Web application performance tool A web application performance tool (WAPT) is used to test web applications and web related interfaces. These tools are used for performance, load and stress testing of web applications, web sites, web API, web servers and other web interfaces. WAPT tends to simulate virtual users which will repeat either recorded URLs or specified URL and allows the users to specify numbe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
System Testing
System testing, a.k.a. end-to-end (E2E) testing, is testing conducted on a complete software system. System testing describes testing at the system level to contrast to testing at the system integration, integration or unit level. System testing often serves the purpose of evaluating the system's compliance with its specified requirements often from a functional requirement specification (FRS), a system requirement specification (SRS), another type of specification or multiple. System testing can detect defects in the system as a whole. System testing can verify the design, the behavior and even the believed expectations of the customer. It is also intended to test up to and beyond the bounds of specified software and hardware requirements. Approaches * Destructive testing: tests are carried out to the specimen's failure, in order to understand a specimen's performance or material behaviour under different loads. * Nondestructive testing: analysis techniques to e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Structural Testing
Structural testing is the evaluation of an object (which might be an assembly of objects) to ascertain its characteristics of physical strength. Testing includes evaluating compressive strength, shear strength, tensile strength, all of which may be conducted to failure or to some satisfactory margin of safety. Evaluations may also be indirect, using techniques such as x-ray ultrasound, and ground-penetrating radar, among others, to assess the quality of the object. Structural engineers conduct structural testing to evaluate material suitability for a particular application and to evaluate the capacity of existing structures to withstand foreseeable loads. Items may include buildings (or components), bridges, airplane wings or other types of structures. See also *Structural analysis *Structural load A structural load or structural action is a mechanical load (more generally a force) applied to Structural engineering#Structural elements, structural elements. A load causes s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stress Testing
Stress testing is a form of deliberately intense or thorough testing, used to determine the stability of a given system, critical infrastructure or entity. It involves testing beyond normal operational capacity, often to a breaking point, in order to observe the results. Reasons can include: * to determine breaking points or safe usage limits * to confirm mathematical model is accurate enough in predicting breaking points or safe usage limits * to confirm intended specifications are being met * to determine Failure cause, modes of failure (how exactly a system fails) * to test stable operation of a part or system outside standard usage Reliability engineering, Reliability engineers often test items under expected stress or even under accelerated stress in order to determine the operating life of the item or to determine modes of failure.Nelson, Wayne B., (2004), ''Accelerated Testing - Statistical Models, Test Plans, and Data Analysis'', John Wiley & Sons, New York, The term "s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Load Test
Load testing is the process of putting demand on a structure or system and measuring its response. Software load testing Physical load testing Many types of machinery, engines, structures, and motors are load tested. The load may be at a designated safe working load (SWL), full load, or at an aggravated level of load. The governing contract, technical specification or test method contains the details of conducting the test. The purpose of a mechanical load test is to verify that all the component parts of a structure including materials, base-fixings are fit for task and loading it is designed for. Several types of load testing are employed * Static testing is when a designated constant load is applied for a specified time. * Dynamic testing is when a variable or moving load is applied. * Cyclical testing consists of repeated loading and unloading for specified cycles, durations and conditions. The ''Supply of Machinery (Safety) Regulation 1992 UK'' state that load testi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alternator
An alternator (or synchronous generator) is an electrical generator that converts mechanical energy to electrical energy in the form of alternating current. For reasons of cost and simplicity, most alternators use a rotating magnetic field with a stationary armature.Gordon R. Selmon, ''Magnetoelectric Devices'', John Wiley and Sons, 1966 no ISBN pp. 391-393 Occasionally, a linear alternator or a rotating armature with a stationary magnetic field is used. In principle, any AC electrical generator can be called an alternator, but usually, the term refers to small rotating machines driven by automotive and other internal combustion engines. An alternator that uses a permanent magnet for its magnetic field is called a magneto. Alternators in power stations driven by steam turbines are called turbo-alternators. Large 50 or 60 Hz three-phase alternators in power plants generate most of the world's electric power, which is distributed by electric power grids. History ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
