投稿時間:2022-03-22 00:29:34 RSSフィード2022-03-22 00:00 分まとめ(40件)

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IT	気になる、記になる…	｢iPhone SE (第3世代)｣の分解動画や分解レポートが公開される − バッテリー容量は約12％アップ	https://taisy0.com/2022/03/21/154992.html	apple	2022-03-21 14:48:48
AWS	AWS Database Blog	Physical migration of Oracle databases to Amazon RDS Custom using Data Guard	https://aws.amazon.com/blogs/database/physical-migration-of-oracle-databases-to-amazon-rds-custom-using-data-guard/	Physical migration of Oracle databases to Amazon RDS Custom using Data GuardIn the first post of this series we showed you how to perform a physical migration of an Oracle database into Amazon RDS Custom using the RMAN duplicate tool In this post we walk through the steps to migrate Oracle databases into Amazon RDS Custom using Oracle Data Guard with minimum downtime Solution overview We …	2022-03-21 14:40:28
AWS	AWS Database Blog	Physical migration of Oracle databases to Amazon RDS Custom using RMAN duplication	https://aws.amazon.com/blogs/database/physical-migration-of-oracle-databases-to-amazon-rds-custom-using-rman-duplication/	Physical migration of Oracle databases to Amazon RDS Custom using RMAN duplicationOrganizations are moving their self managed Oracle databases to AWS managed database services to modernize their applications and gain access to cloud services With Amazon RDS Custom you now have the privileges needed to perform a physical migration of your Oracle database into Amazon Relational Database Service Amazon RDS In this post we describe the key …	2022-03-21 14:39:18
AWS	AWS Mobile Blog	Build a Serverless Full-Stack Registration App in minutes using AWS Amplify	https://aws.amazon.com/blogs/mobile/build-a-serverless-full-stack-registration-app-in-minutes-using-aws-amplify/	Build a Serverless Full Stack Registration App in minutes using AWS AmplifyCustomers often ask developers to design and create a web application form that captures the registration for some events or training that they want to host AWS Amplify solves this problem by creating the required resources and generating the boilerplate integration code for different layers using serverless technologies Now developers can focus on developing the …	2022-03-21 14:56:44
AWS	lambdaタグが付けられた新着投稿 - Qiita	APIgatewayのプロキシ統合と非プロキシ統合についてわかってなかった	https://qiita.com/watanabe-tsuyoshi/items/020087f9bf47eb0599be		2022-03-21 23:03:16
python	Pythonタグが付けられた新着投稿 - Qiita	AtCoder Beginner Contest 244 参戦記	https://qiita.com/c-yan/items/72f3073447157e424cde		2022-03-21 23:26:47
python	Pythonタグが付けられた新着投稿 - Qiita	Typescript GitHubトレンドデイリーランキング!!【自動更新】	https://qiita.com/hgaiji/items/6de00e057cc0e214b816	TypescriptGitHubトレンドデイリーランキング【自動更新】GitHubTrendingをキャッチアップする習慣をつけて、強強エンジニアになろう。	2022-03-21 23:14:45
python	Pythonタグが付けられた新着投稿 - Qiita	PyCaretのドキュメントを眺める	https://qiita.com/takotaketako/items/718f47d6a7b8fb81a9d5	大きく分けて教師あり教師なしで実装されている機能が異なり、実際に使う時にはどれがどれにあったっけと混乱することが多いのですが、こうやって全体として眺めてみると少し整理できた気がします。	2022-03-21 23:01:52
js	JavaScriptタグが付けられた新着投稿 - Qiita	HTTPでgetしたデータがconsole.logで見えないと思ったら非同期処理が原因だったらしい	https://qiita.com/junjun11111/items/d411714b74b17c37a141	HTTPでgetしたデータがconsolelogで見えないと思ったら非同期処理が原因だったらしいHTTPでgetしたデータがないvueで以下のようなコードを書いていたが、consolelogにはなにも出力されなかった。	2022-03-21 23:13:50
js	JavaScriptタグが付けられた新着投稿 - Qiita	すぐに使えるSvelteハンドブック	https://qiita.com/c-shiraga/items/02c3c8d9e044622380dc	ltscriptlangtsgtconsthandleClickgtalertalertsltscriptgtltonceの場合、回のみ実行されるgtltbuttononclickoncehandleClickgtClickmeltbuttongtlt複数指定する場合gtltbuttononclickonceselfhandleClickgtClickmeltbuttongtイベント修飾子の一覧preventDefault・・・実行する前にeventpreventDefaultを呼び出す。	2022-03-21 23:05:46
Docker	dockerタグが付けられた新着投稿 - Qiita	Dockerfileでファイルやディレクトリごとコンテナにコピーする方法	https://qiita.com/yyy752/items/627189dfbd410463325d	Dockerfileがあるディレクトリに配置したコピーしたいファイルtestfileをコンテナ内のhomesampledir下にコピーさせるCOPYtestfilehomesampledirコピー後は、homesampledirtestfileとコピーされます。	2022-03-21 23:01:01
golang	Goタグが付けられた新着投稿 - Qiita	Golang GitHubトレンドデイリーランキング!!【自動更新】	https://qiita.com/hgaiji/items/e9fd148fd43de127ecd1	GolangGitHubトレンドデイリーランキング【自動更新】GitHubTrendingをキャッチアップする習慣をつけて、強強エンジニアになろう。	2022-03-21 23:14:42
golang	Goタグが付けられた新着投稿 - Qiita	【Go】パスパラメータを使用するときの注意点やエラーハンドリングなど	https://qiita.com/suzuki0430/items/3eb0f01be3521cb0bd8e	errsNewNotFoundErrorcustomernotfoundのようなエラーを返していますが、この中身はMessageとCodeを含んだAppErrorという構造体となります。	2022-03-21 23:03:09
Git	Gitタグが付けられた新着投稿 - Qiita	【超初心者】GitコマンドのTab補完でブランチ名を表示できるようにしたい！	https://qiita.com/katao_eng/items/81df1b8ce3d784cd616c	→【ステップ】Gitコマンドでtab補完を有効にするさっそく記事のとおりやってみますがうまくいきません。	2022-03-21 23:40:32
Ruby	Railsタグが付けられた新着投稿 - Qiita	devise nameカラム追加＜忘備録＞	https://qiita.com/2016asap/items/a359e791a60f45a22607	devisenameカラム追加deviseにはデフォルトでnameカラムがない。	2022-03-21 23:32:30
技術ブログ	Developers.IO	TypeScriptのesModuleinteropフラグを設定してCommonJSモジュールを実行可能とする	https://dev.classmethod.jp/articles/esmoduleinterop-flag-for-typescript/	common	2022-03-21 14:54:33
海外TECH	Ars Technica	So how do Russian cosmonauts feel about Russia’s war on Ukraine?	https://arstechnica.com/?p=1842331	everyone	2022-03-21 14:00:39
海外TECH	MakeUseOf	Galaxy A53 5G vs. Galaxy A33 5G: Which Is Right for You?	https://www.makeuseof.com/galaxy-a33-vs-a53/	Galaxy A G vs Galaxy A G Which Is Right for You The Samsung Galaxy A and A have some great specs at attractive mid range price points So how do they compare and which phone should you choose	2022-03-21 14:30:13
海外TECH	DEV Community	How the touch Command works on Linux	https://dev.to/smpnjn/how-the-touch-command-works-on-linux-2bep	How the touch Command works on LinuxThe touch command lets us create files or update the access or modified date of a file It was first created in by AT amp T Bell Laboratories Today on Linux and Unix based systems touch can be accessed via the terminal In this guide let s look at how touch works The syntax for touch can be seen below where x is the name of the file we want to interact with or create and OPTIONS are optional settings we can include touch OPTIONS x Creating a file on Linux or Mac from TerminalIf you want to make a file on Linux or MacOS from the terminal we just have to use the touch command by itself For example touch my file txt will create a file called my file txt in whatever directory you are currently in If you need help changing directories read our article on the cd command touch my file txtIf you want to make multiple files on Linux or MacOS then use the touch command and separate each by spaces touch my file txt my file txtIf you want to create multiple numbered files in a certain file format on Linux or MacOS use the touch and use curly braces for the numbering For example touch my file txt will create my file txt through to my file txt touch my file txt Changing the access modification time of a File on Linux or MacIf you need to change the access or modification time of an existing file to the current time you can run the same command on an existing file This will update the access and modification times of the file touch my file txtIf we want to update the access time and modification time separately we use the a option for access time and the m option for modified time for example the below code will update the modification time only touch m my file txt Updating the timestamp of a file only if it exists on Linux or MacIf we only want to update the timestamps of a file if the file exists on Linux or Mac and not create it if it doesn t we need to use the c option For example the below code will update a file s timestamp should it exist to the current time but it will do nothing if it doesn t touch c my file txtThis can be combined with the a and m options to only update access or modification time respectively touch ca my file txt Setting a specific timestamp for a file on Linux or MacIf we want to set a specific time and date on a file we can do that using the d command or date touch time format on MacOSOn the latest versions of MacOS the time format has to be in the form YYYY MM DDThh mm SS For example sets the access and modified date to March at touch d my file txt touch time format on LinuxOn Linux based systems the touch time format is YY YYMMDDhhmm ss That means we can set the modified and access dates of a file by using touch d YY YYMMDDhhmm ss file txt The first two digits of the year and the seconds are optional Typically it is easier to set the year as the full digit year code however the first two digits of the year are optional If only two year digits are given then most systems assume to means and to mean This will presumably change as time goes on so it is best to stick to digits years As an example the below code sets the access and modified dates for my file to March at touch d my file txt Combining specific timestamps with other options in the touch commandAs you might expect you can combine this with other commands For example touch ad sets the access date and touch md sets the modified date of a file Updating the access modification time of a symlink in Linux or MacBy default if you try to update the access or modification time of a symlink it will also update the reference file too To only update the symlink itself use the h option For example the below code updates both the access and modification time for a symlink called mySymLink touch h mySymLinkThis can be combined with other options too For example this will update only the symlink access time to the current time touch ha mySymLink Setting the timestamp of a file to match another file on Linux or MacYou can also set a timestamp of a file to match another file s timestamp using the r option For example if you want new file txt to have the same timestamp as old file txt we would write the following touch r old file txt new file txt	2022-03-21 14:52:08
海外TECH	DEV Community	Debugging Java Equals and Hashcode Performance in Production	https://dev.to/codenameone/debugging-java-equals-and-hashcode-performance-in-production-3al6	Debugging Java Equals and Hashcode Performance in ProductionI wrote a lot about the performance metrics of the equals method and hash code in this article There are many nuances that can lead to performance problems in those methods The problem is that some of those things can be well hidden To summarize the core problem the hashcode method is central to the java collection API Specifically with the performance of hash tables specifically the Map interface hash table The same is true with the equals method If we have anything more complex than a string object or a primitive the overhead can quickly grow But the main problem is nuanced behavior The example given in the article is that of the Java SE URL class The API for that class specifies that the following comparison of these distinct objects would evaluate to true new URL equals new URL http localhost new URL hashcode new URL http localhost hashcode This is a bug in the specification Notice this applies to all domains so lookup is necessary to perform hashing or equals That can be very expensive TIP performance of equals hashcode must be very efficient for usage in key values containers such as maps and other hash based collectionsThere are so many pitfalls with these methods Some of them would only be obvious at scale E g a friend showed me a method that compared objects and had an external dependency on a list of potential values This performed great locally but slowly in production where the list had more elements How can you tell if a hash function is slow in production How do you even find out that it s the fault of the hash function Measuring PerformanceFor most intents and purposes we wouldn t know the problem is in the equals method or hash code We would need to narrow the problem down It s likely that a server process would take longer than we would expect and possibly show up on the APM What we would see on the APM is the slow performance of a web service We can narrow that down by using the metrics tools provided by Lightrun Note Before we proceed I assume you re familiar with the basics of Lightrun and have it installed If not please check out this introduction Lightrun includes the ability to set several metric types A counter which counts the amount of times a specific line of code is reachedTime measure tictoc which measures the performance of a specific code blockMethod duration same as tictoc for a full methodCustom metric measure based on a custom expressionNotice that you can use conditions on all metrics If performance overhead impacts a specific user you can limit the measurement only to that specific user We can now use these tools to narrow down performance problems and find the root cause e g here I can check if these two lines in the method are at fault Adding this tictoc provides us with periodical printouts like this INFO Feb TicToc Stats VetListBlock breakpointId fcd b e ee df count max mean min name VetListBlock stddev timestamp You can review these printouts to get a sense of the overhead incurred by these lines You can also use the counter to see the frequency at which we invoke a method NOTE You can pipe these results to Prometheus Grafana for better visualization but that requires some configuration that s outside of the scope of this tutorial If you see a collection or map as the main performance penalty in the application it s very possible that a wayward hash code or equals method are at fault At this point you can use metrics in the method itself to gauge its overhead This is very similar to the way in which we would often debug these things locally Surround a suspect area by measurements and rerun the test Unfortunately that approach is slow as it requires recompiling deploying the app It s also impractical in production With this approach we can quickly review all the “suspicious areas and narrow them all down quickly Furthermore we can do that on a set of servers using the tag feature In this way we can scale our measurements as we scale our servers Checking Thread SafetyMutable objects can be changed from multiple threads while we try to debug them This might trigger problems that appear to be performance issues By verifying that we have single thread access we can also reduce synchronization in critical sections E g in a key values store if a separate thread mutates the key the store might get corrupted The simplest way to do this is log the current thread using the condition Current thread is Thread currentThread getName The problem is that a condition like this can trigger output that s hard to follow you might see hundreds of printouts So once we find out the name of the thread we can add a condition Thread currentThread getName equals threadName This will only log access from different threads This is something I discussed in my previous post here TL DRThe performance metrics of the equals and hashcode methods in Java SE are crucial They have a wide reaching impact on the Java collection API especially in the key values related calls Objects must implement this efficiently but it s often hard to determine the Java class that s at fault We can use Lightrun metrics to time arbitrary methods in production It s important to measure class performance in the “real world environment which might differ from our local test cases Objects can behave radically differently with production scale data and minor changes to a class can make a big difference We can narrow down the overhead of hashes use logs to determine threading issues and use counters to determine usage of an API	2022-03-21 14:45:25
海外TECH	DEV Community	Creating a Proxy for your GraphQL Server	https://dev.to/harshitkumar31/creating-a-proxy-for-your-graphql-server-5b9o	Creating a Proxy for your GraphQL ServerI needed to create a proxy server for my GraphQL service to be able to make some decisions before reaching my service This article will document how you can do the same with minimal amount of code We ll be leveraging awesome utilities provided by graphql tools Installationnpm init ynpm i graphql tools delegate graphql tools utils graphql tools wrap apollo server cross undici fetch graphql typescript Create an executorExecutor is a function used capable of retrieving GraphQL results both introspection amp fetching results during a query s execution In the executor I ve defined the GraphQL service s URL which I want to proxy an open API to fetch your favourite Anime characters const executor async document variables context document any variables any context any gt const query print document const fetchResult await fetch method POST headers Content Type application json context headers body JSON stringify query variables return fetchResult json Define applicationProxyResolverThis function is passed to wrapSchema method In this method you should be able to make some decisions For example I wanted to validate some headers amp only honour the requests if they had these headers We ll use delegateToSchema to delegate the entire request to our original GraphQL service export const applicationProxyResolver subschemaConfig operation transformedSchema subschemaConfig any operation any transformedSchema any gt return parent any args any context any info any gt return delegate delegateToSchema schema subschemaConfig operation operationName info operation name value context info transformedSchema Let s fire up the graphQL proxy server const init async gt const schema wrapSchema schema await introspectSchema executor executor createProxyingResolver applicationProxyResolver const server new ApolloServer schema The listen method launches a web server server listen then url gt console log Server ready at url init You can find this code at Github Is there an easier way to do this Please comment amp let me know	2022-03-21 14:39:40
Apple	AppleInsider - Frontpage News	Top deals March 21: Up to $4,000 off Samsung 8K TVs; up to $400 off Z Fold 3, Flip 3, S21 phones; up to $1,900 off Bespoke kitchen appliances	https://appleinsider.com/articles/22/03/21/top-deals-march-21-up-to-4000-off-samsung-8k-tvs-up-to-400-off-z-fold-3-flip-3-s21-phones-up-to-1900-off-bespoke-kitchen-appliances?utm_medium=rss	Top deals March Up to off Samsung K TVs up to off Z Fold Flip S phones up to off Bespoke kitchen appliancesMonday s top deals include up to off Samsung Neo QLED K TVs up to off Samsung Z Fold Z Flip and S FE phones and free professional in home installation and off a Samsung Frame TV Samsung Z Flip Samsung Neo QLED K TV and Samsung Frame are on sale today Read more	2022-03-21 14:48:25
Apple	AppleInsider - Frontpage News	New iPhone SE survives falls like the iPhone 13 - but you should still get a case	https://appleinsider.com/articles/22/03/21/new-iphone-se-survives-falls-like-the-iphone-13---but-you-should-still-get-a-case?utm_medium=rss	New iPhone SE survives falls like the iPhone but you should still get a caseThe third generation iPhone SE is almost as durable as the iPhone drop tests reveal with the low cost smartphone surviving face own and side drop tests to the same level as its stablemate When Apple introduced the third generation iPhone SE it offered a series of claims about its ability to survive stumbles and spills using the toughest glass in a smartphone In testing it appears the claims are pretty true The series of Allstate Protection Plans Breakability Tests took the iPhone SE and placed the smartphone in danger In three tests covering face down back down and side down drops the iPhone SE was dropped onto a sidewalk from a height of six feet Read more	2022-03-21 14:23:15
Apple	AppleInsider - Frontpage News	Jamf launches Fundamentals plan to compete with Apple's Business Essentials	https://appleinsider.com/articles/22/03/21/jamf-launches-fundamentals-plan-to-compete-with-apples-business-essentials?utm_medium=rss	Jamf launches Fundamentals plan to compete with Apple x s Business EssentialsJamf Fundamentals is a new device management plan from the long time device management firm that is aimed at the same small to medium firms that Apple Business Essentials is targeting Credit JamfFollowing its recent addition of a BYOD management plan for larger firms Jamf has now announced Jamf Fundamentals for what it describes as growing small midsized businesses Read more	2022-03-21 14:08:20
Apple	AppleInsider - Frontpage News	AppleInsider is hiring writers - apply now!	https://appleinsider.com/articles/21/11/16/appleinsider-is-hiring-east-and-west-coast-editors---apply-now?utm_medium=rss	AppleInsider is hiring writers apply now Do you obsess over Apple news and rumors Do you roll out of bed and hit your favorite Apple news sites before concerning yourself with the broader aspects of life Do you like teaching people how to use that iPhone or iPad We may have the perfect opportunity for you AppleInsider is HiringAppleInsider ーthe definitive stop for insider Apple news rumors analysis and reviews ーseeks passionate energetic and self motivated writers with unique skill sets that can enrich our audience of millions Read more	2022-03-21 14:40:26
海外TECH	Engadget	'Super Auto Pets' is an awesome (and extra cute) intro to auto battlers	https://www.engadget.com/super-auto-pets-auto-battler-game-143026957.html?src=rss	x Super Auto Pets x is an awesome and extra cute intro to auto battlersIt s not often a brand new genre of game comes around And while battle royale style titles like PUBG and nbsp Fortnite have gotten a ton of attention and countless clones in recent years there s another new type of game ーespecially for fans of strategy and tactics games ーthat deserves your attention auto battlers Now before anyone gets hysterical about auto battlers already having been around for some time let s get one thing clear While the genre can trace its lineage back to Warcraft mods like Pokemon Defense the category as a whole didn t really get mainstream attention until thanks to titles like Dota Autochess which is now just Autochess Teamfight Tactics Hearthstone s Battlegrounds and Dota Underlords However since those games have characters and abilities based on existing titles e g Dota and League of Legends their counterpart auto battlers are kind of intimidating for new players to pick up I know because despite it becoming one of her favorite games as of late I played Teamfight Tactics for almost a year on my own before successfully convincing my wife to give it a shot And on PC both Teamfight Tactics and Battlegrounds are only available within the launcher for their parent games That makes them seem more like expansions rather than a brand new game type which is admittedly somewhat confusing But that s where Super Auto Pets comes in By taking the basic auto battler formula and then adding a roster of cute cuddly animals Super Auto Pets has become the perfect intro to the genre while still being surprisingly deep The game s general mechanics are simple Every turn you start with gold You then use the gold to buy pets or food for three gold each or one gold in the case of the pill while trying to assemble the strongest five pet squad you can muster If you combine three of the same pet it ll turn into a stronger level version And if you combine a total of six of the same creature you ll get a top tier level animal Alternatively if you see a pet you like but can t afford at the moment you can freeze it to save it for later After that comes the battling It s just you versus someone else s squad with each getting a silly auto generated team name If you win you get a trophy If you don t you lose some hearts up to three depending on the number of rounds Your ultimate goal is to eke out victories before all your hearts are gone And the rounds keep coming until you win or die trying Team Wood GamesNow I know I m glossing over some of the game s finer mechanics But they re not hard to pick up and will be immediately familiar to anyone who has played a trading card game like Magic the Gathering or Hearthstone And with over pets already in the game and more on the way there are a lot of nifty interactions that are a blast to learn Take the parrot who copies the ability of the pet in front of it Or the skunk who reduces the health of the enemy team s tankiest pet And then there s the lovable turtle who looks like a dead ringer for the old blob style Android emoji that gives fellow pets armor after it faints Each pet s ability is a callback to the creature s personality adding both flavor and strategy to the game And I haven t even mentioned the deer s ability which is downright hilarious But you re going to have to check it out for yourself because I m not spoiling it here But my absolute favorite thing about Super Auto Pets is how easy it is to pick up and put down whenever I want I had my first kid six months ago so it probably won t surprise you when I say I don t have quite the same amount of time for games as I used to ーlet alone titles like Teamfight Tactics which typically last to minutes or more per match In contrast not only is Super Auto Pets available on pretty much anything with an internet connection Android Steam web browsers and most recently iOS thanks to a recent patch I can quit at a moment s notice in the middle of a run with zero consequences That means I can throw my phone down with haste if I need to change the kid or give him a bottle Then later when he goes down for a nap I can hop back in where I left off And thanks to cross platform support it doesn t even have to be on the same device It s almost the perfect mobile game that is aside from needing an internet connection which means I can t really play it on the subway Team Wood GamesAnd because the game is free to play there s essentially no barrier to entry The game s core pets are available from the start while another pets are available for as part of an expansion pack That s more than reasonable especially since the expansion animals don t really feel like an upgrade in power It s more like different flavors than a slimy pay to win cash grab All other in app purchases are completely cosmetic and most of them can be bought with points that are easily acquired just by playing the game There s even a player versus mode though for obvious kiddo related reasons I haven t really tried it out For me Super Auto Pets is the rare game that s just as engaging on desktop as it is on mobile due to its adorable art style and simple but deep mechanics It doesn t prey on my wallet I ve spent a grand total of dollars over countless hours of gameplay and it fits into my schedule without infringing on my more pressing real life responsibilities So even though there s no shortage of new titles I d love to drown myself in like Elden Ring Triangle Strategy and others Super Auto Pets is one of the select few games I actually have the time to play I appreciate that it lets me keep in touch with a hobby that s been largely pushed aside and it s a great way to try out a fun twist on more traditional strategy games And even though I achieved the incandescent high of getting my first win long ago I can already tell this is going to be a game I ll keep in my pocket for a long time coming	2022-03-21 14:30:26
海外TECH	Engadget	Match has a new dating app for single parents	https://www.engadget.com/match-dating-app-single-parents-ios-android-140704838.html?src=rss	Match has a new dating app for single parentsToday is National Single Parents Day and Match has unveiled a new app designed to help such folks find love The aim of Stir is to help single parents meet chat with and date folks who also have kids Match says there are around million single parents in the US who are often underserved by many dating apps After you answer questions on personality and values Stir will show you potential matches Once you find someone you have a spark with you ll be able to arrange a date Match is aware that single parents might find it hard to coordinate their schedules and find a time that works for both of them The app has a feature called Stir Time which allows you to display your available quot me time quot Hopefully that will line up with your prospective date s calendar Stir Time schedules can be displayed on your profile quot Having kids shouldn t be a dealbreaker when dating quot Match Group s Dinh Thi Bui said in a statement quot We re dedicated to giving single parents a dating experience where they are celebrated and feel like they can be themselves With that our hope is that they can truly focus on having a personal life beyond navigating parenthood quot Stir is available on the App Store and the Google Play Store	2022-03-21 14:07:04
海外TECH	Engadget	Honda's HALO facility is the 'world's most advanced' wind tunnel	https://www.engadget.com/hondas-halo-facility-is-the-worlds-most-advanced-wind-tunnel-140053103.html?src=rss	Honda x s HALO facility is the x world x s most advanced x wind tunnelRegular readers of Engadget may have noticed that much of our EV reviews and coverage makes mention of the vehicle s drag coefficient It s a handy indicator that measures the ratio of the drag force to the force produced by the dynamic pressure times the area ーessentially the lower the drag coefficient the less drag the vehicle produces and the more efficiently it pushes through air nbsp HondaFor ICE internal combustion vehicles higher a drag coefficient translates into lower fuel efficiency and more frequent trips to the pump For EVs a low drag coefficient is even more critical because it directly impacts the vehicle s driveable range a continuing concern for many potential EV buyers As such designing optimally aerodynamic vehicles is in every automaker s interest but doing so does require the use of a specialized wind tunnel technologies much like the million state of the art HALO facility Honda opened on Monday in Central Ohio HALO Honda Automotive Laboratories of Ohio is quot the world s most advanced wind tunnel quot according to Honda offering three distinct testing capabilities ーaerodynamics aeroacoustics and racing ーwith which to develop Honda and Acura products as well as conduct general science and research work with third parties nbsp nbsp nbsp Honda quot I can tell you our new HALO wind tunnel will be an incredible new asset to our engineers as well as others evolved in aerodynamic research in America providing a critical new resource for future innovation quot Jim Keller EVP of Honda Development and Manufacturing of America said in a Friday press call quot This new wind tunnel and our safety research center will provide our R amp D engineers with two world class facilities in Ohio to support the design and development of new products quot When vehicles are operated in a wind tunnel they drive on what is essentially a giant treadmill belt These belts are designed to control the boundary layer between the floor and the vehicle a critical factor in generating accurate aerodynamic data Mike Unger Wind Tunnel Lead at HALO explained during the call HALO uses two ton belt modules a standard quot wide quot belt which sits under the entire vehicle and works well for sedans and other low riding vehicles and the belt system which puts one under each tire a fifth under the whole vehicle and is meant for testing SUVs Each can be swapped out for the other in under four hours HondaFor acoustics testing the HALO utilizes more than exterior microphones studded throughout the wind tunnel and another mics within the vehicle itself Thanks to a novel microphone array Honda techs can switch the wind tunnel from aerodynamic testing to aeroacoustic testing in just half an hour ーa process that used to take around half a day to complete Determining the frontal area of a new vehicle a stat necessary to properly calibrate the tunnel s results is done with lasers and optical cameras that precisely measure the vehicle s front and side proportions The tunnel is also equipped with a degree turntable Unger said quot which allows us to test various and sometimes extreme yaw angles as well load the car as quickly and as efficiently as possible quot There s also an ton diagnostic tool nbsp Honda quot Essentially it s a big giant big robotic arm that we can attach a sensor on the end of and locate anywhere in the tunnel quot he continued With it techs can quot measure any kind of phenomena we re looking for ーit could be pressure velocity sound or any other thing this tool will allow the test engineer to look into detailed phenomena to understand exactly what s going on with the flow field quot The system is so precise that it can measure drag forces with a sensitivity of Newtons roughly the weight of a standard D battery The tunnel itself is an eighth of a mile long with a test area measuring m x m x m large enough to accommodate up to a full size delivery van It s m diameter fan is outfitted with a dozen hollow carbon fiber fixed pitch blades which spin up to rpm driven by a MW HP electric motor and generates wind speeds in excess of MPH HondaHonda began development on the HALO facility in in what was initially an effort to mitigate the expenses the company was incurring flying its technicians and the prototypes being developed at the Honda R amp D Center in Ohio around the world in order to get access to suitable aerodynamic testing facilities like the company s existing wind tunnel in Japan Those considerations as well as quot the arrival of the electrified era made building Honda s own wind tunnel a smart decision quot Wind Tunnel Business Strategy Lead Chris Combs said during the call The company does not plan to bogart its new facility s research capabilities however quot Honda has partnered with the Transportation Research Center to form a consortium for the purpose of promoting aerodynamic research that will be shared amongst consortium members quot Combs said quot We look forward to hosting college students in the future to advance in STEM careers and overall aerodynamic endeavors It is anticipated that some non auto parties will utilize the facility for projects focused on renewable energy like wind turbines and even architectural design quot	2022-03-21 14:00:53
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