Chifukwa Chake Kumangirira Springs Kwanthawi yayitali Kumangirira?
Muyenera kasupe kuti mugwiritse ntchito mphamvu pamtunda wautali, koma imapindika ndikugwera chammbali pansi pa katundu. Kusakhazikika uku, wotchedwa buckling, zingayambitse makina anu onse kupanikizana kapena kulephera.
Kuponderezana kwa kasupe kwautali kumamangirira ngati kutalika kwake kuli kokulirapo poyerekeza ndi mainchesi ake, ubale wotchedwa slenderness ratio. Pamene chiŵerengero ichi ndi chachikulu, kasupe sangathe kukhala ndi mzati wowongoka pansi pa katundu ndipo amapindika cham'mbali m'malo mwake.
Ndikukumbukira pulojekiti yomwe inali ndi kasitomala yemwe adapanga makina osunthika osunthika a ma tray a mafakitale. Iwo ankafunika kasupe wautali kwambiri kuti akankhire muluwo m’mwamba. Chitsanzo chawo choyambirira chinkagwiritsa ntchito kasupe womwe unali utali wa pafupifupi mita imodzi koma pafupifupi masentimita awiri m'mimba mwake. Akangoika katundu pa izo, kasupe anapinda mu mawonekedwe a C ndipo anakakamira. Iwo ankaganiza kuti ankafunika kasupe wamphamvu, koma kasupe wamphamvu wa miyeso yofanana akanamanga mwamphamvu kwambiri. The problem wasn't strength; kunali kukhazikika. Tinayenera kukonzanso msonkhano wonse wa masika kuti uphatikizepo a ndodo yotsogolera[1] amene anadutsa pakati pa kasupe. Kuwonjezera kosavuta kumeneku kunapangitsa kasupe kukhala wogwirizana bwino ndikuthetsa vutoli nthawi yomweyo. It was a classic case of how the geometry of a long spring is often more important than the material it's made from.
Kodi Slenderness Ratio ndi Chifukwa Chiyani Ili Yofunika?
Mukungomva kuti "slenderness ratio[^ 2]" is the cause of your spring's buckling[^ 3]. But this technical term doesn't help you understand why your spring is unstable or how to fix it.
The slenderness ratio[^ 2] ndi mawerengedwe osavuta: the spring's free length (L) kugawidwa ndi mainchesi ake a coil (D). Ngati chiŵerengero ichi ndi chachikulu kuposa 4, masika ali pachiwopsezo cha buckling. This single number is the most important predictor of a long spring's stability.
The slenderness ratio[^ 2] ndi chinthu choyamba chomwe timayang'ana pamene kapangidwe kamene kamafuna masika aatali. Izo zimatipatsa ife mwamsanga, njira yodalirika yowunika kukhazikika kwake popanda kuyesa kovuta. Tangoganizani kuyesera kuyima motalika, udzu wothira wakumwa kumapeto kwake ndi kukanikiza pansi - udzapinda ndi kugwa nthawi yomweyo. Tsopano yesani chimodzimodzi ndi lalifupi, wide paper cup—it's completely stable. Udzu uli ndi mkulu slenderness ratio[^ 2], pomwe kapu ili ndi yotsika kwambiri. Springs amachita chimodzimodzi. Chiŵerengero pansipa 4:1 (kutanthauza kuti utali wake ndi wosakwana kanayi m’mimba mwake) imakhala yokhazikika nthawi zonse. Pamene chiŵerengero chikuwonjezeka, momwemonso chiopsezo. Mukakhala pamwamba 8:1, Kutentha kumatsimikizika pokhapokha ngati kasupe amathandizidwa bwino. Chiwerengerochi chikuwongolera njira yathu yonse ya akasupe yayitali.
Assessing Your Spring's Stability
Kuwerengera kosavuta kumeneku kumakuwuzani ngati muli ndi vuto.
- Malo okhazikika: Kuchuluka kotsika kumatanthauza kuti kasupe ndi waufupi.
- Malo osakhazikika: Kugwiritsa ntchito kwambiri kumatanthauza kuti kasupe ndi wautali komanso wopapatiza.
| Kuchuluka kwa zowonda (L / d) | Kuwononga chiopsezo | Zoyenera kuchita |
|---|---|---|
| Pansi 4 | Otsika kwambiri | Palibe chithandizo chomwe chimafunikira. |
| Pakati 4 ndi 8 | Mtengo wokwanira | Masika ayenera kutsogoleredwa. |
| Pamwamba 8 | Winawake | Kasupe ayenera kuthandizidwa kwathunthu ndi a ndodo yotsogolera[1] kapena nyumba. |
| N / A | N / A | Kwa akasupe omwe amagwira ntchito, buckling[^ 3] si vuto. |
Kodi mumaletsa bwanji kasupe wautali kuchokera ku bundling?
You've identified that your long spring has a high slenderness ratio[^ 2] ndipo adzanyamuka. Tsopano muyenera yankho lothandiza, but you're unsure if you should guide it internally or externally.
Kupewa buckling[^ 3], uyenera kuthandizira masika kuti ukhale wowongoka. Njira ziwiri zothandiza kwambiri ndikuwatsogolera ndodo yamkati[^ 4] (mandrel) kapena kuchitsekera mkati mwa dzenje lotsekeka (bowa kapena nyumba).
Kusankha pakati pa ndodo yamkati ndi nyumba yakunja kumadalira makina anu enieni komanso chilengedwe. Wamkati ndodo yotsogolera[1] ndiwofala kwambiri komanso wothandiza. Imadutsa pakati pa kasupe, kuteteza kuti zisapindike. We just need to make sure there is a small clearance so the spring doesn't rub against the rod, zomwe zingayambitse kupsinjika ndi kupsinjika. Njira ina ndikuyika kasupe mkati mwa dzenje kapena chubu. Nyumbayi ili ndi kasupe kwathunthu. Ili ndi yankho labwino kwambiri mukafunikanso kuteteza kasupe ku zinyalala zakunja kapena kuwonongeka. Muzochitika zonsezi, chinsinsi ndi chakuti chilolezo pakati pa kasupe ndi chithandizo ndi chaching'ono kuti chiteteze buckling koma chachikulu mokwanira kulola kuyenda kwaulere.. Njira zonsezi zimatembenuza gawo losakhazikika kukhala lodalirika.
Kusankha Njira Yoyenera Yothandizira
Ntchito yanu idzatsimikizira njira yabwino yokhazikitsira masika.
- Ndodo Yamkati: Zosavuta, ogwira, ndipo imagwira ntchito bwino pamene kunja kwa kasupe kumafunika kumveka bwino.
- Nyumba Zakunja: Amapereka chithandizo chokwanira ndi chitetezo cha masika.
| Njira Yothandizira | Kufotokozera | Ubwino wake | Malingaliro |
|---|---|---|---|
| Internal Guide Rod | Ndodo imayikidwa pakati pa kasupe. | Zosavuta kukhazikitsa; allows for open access to the spring's exterior. | Ndodo iyenera kukhala yolimba kuti isagwe; pamafunika chilolezo. |
| Nyumba yakunja / mbiya | Kasupe kamagwira ntchito mkati mwa chubu chokwanira kapena dzenje. | Imapereka bata lalikulu; imateteza kasupe kuchokera ku dothi ndi kuwonongeka. | Imatha kupanga mikangano; pamafunika kukhazikika kwa dzenje. |
| Palibe chithandizo | Kasupe umagwira ntchito m'malo aulere. | Oyenera okha akasupe ndi otsika kwambiri slenderness ratio[^ 2] (L / d < 4). | Osati njira yayitali, akasupe ochepa. |
Mapeto
Kutalika kwa Spring Springs Custor chifukwa cha mmwamba slenderness ratio[^ 2]. Mwa kumvetsetsa mfundo iyi ndikugwiritsa ntchito ndodo kapena nyumba yothandizira, Mutha kuwonetsetsa kuti kasupe wanu amagwira ntchito modalirika.
[1]: Dziwani momwe ndodo yowongolera ingakhalire imatha kukhazikika akasupe aitali ndikuwonjezera magwiridwe awo.
[^ 2]: Phunzirani za kuchuluka kwake ndi gawo lawo lovuta posankha kukhazikika kwa kasupe ndi magwiridwe antchito.
[^ 3]: Dziwani zomwe zimapangitsa kuti pakhale kukwera kwa masika ndi momwe mungapewere pamapangidwe anu.
[^ 4]: Onani maubwino ogwiritsira ntchito ndodo yamkati kuti muthandizire akasupe ndikuwongolera magwiridwe antchito awo.